Login In
1990 Volume 6 Issue 1
1990, 6(01): 1-3
doi: 10.3866/PKU.WHXB19900101
Abstract:
Binary systems of alcohols and aprotic solvents have been studied systematically by NMR measurements. ~1H, ~(13)C, ~(15)N and ~(17)O chemical shifts and proton T_1 have been measured. The effects of solvents on ~1H and ~(13)C chemical shifts of alcohols were discussed. ~(13)C chemical shifts of α-carbon atom of alcohol were used to determine the ability of solvents to distort or disrupt the structure of alcohol, while their ~1H che-mical shifts were used to measure the strength of hydrogen bond between solvents and alcohols. The result was obtained showing that the stronger the solvent as a donor, the stronger its ability to disrupt the structure of alcohols.
Chemical shifts of solvents hae also been measured. It was thought that their ...
Binary systems of alcohols and aprotic solvents have been studied systematically by NMR measurements. ~1H, ~(13)C, ~(15)N and ~(17)O chemical shifts and proton T_1 have been measured. The effects of solvents on ~1H and ~(13)C chemical shifts of alcohols were discussed. ~(13)C chemical shifts of α-carbon atom of alcohol were used to determine the ability of solvents to distort or disrupt the structure of alcohol, while their ~1H che-mical shifts were used to measure the strength of hydrogen bond between solvents and alcohols. The result was obtained showing that the stronger the solvent as a donor, the stronger its ability to disrupt the structure of alcohols.
Chemical shifts of solvents hae also been measured. It was thought that their ...
1990, 6(01): 4-7
doi: 10.3866/PKU.WHXB19900102
Abstract:
1990, 6(01): 8-16
doi: 10.3866/PKU.WHXB19900103
Abstract:
The enumeration of stereoisomers is performed by concerning the ligand substitution as coloring of vertices in the skeleton of a molecule. The colored fragments are classified into species denoted by the symbol (α_1~(n1), α_2~(n2), …, α_f~(nf)) in which α_i(i=1, 2,…,f) being the number of vertices colored identically and n_i standing for its appearances. They satisfy: α_1>α_2>…>α_f and
n_1α__1+n_2α_2+…+n_fα__f=N
where N is the total number of skeleton vertices. By means of symmetry and com-binatorial analysis, both total number of skeleton vertices. By means of symmetry and combinatorial analysis, both the chiral and achiral isomers can be enumerased respectively for each substitutional species. For example, species (1~N) means ligands differ completely one another and the number of chiral isomers can be computed by using the following formula
M_c=N!/|G|...
The enumeration of stereoisomers is performed by concerning the ligand substitution as coloring of vertices in the skeleton of a molecule. The colored fragments are classified into species denoted by the symbol (α_1~(n1), α_2~(n2), …, α_f~(nf)) in which α_i(i=1, 2,…,f) being the number of vertices colored identically and n_i standing for its appearances. They satisfy: α_1>α_2>…>α_f and
n_1α__1+n_2α_2+…+n_fα__f=N
where N is the total number of skeleton vertices. By means of symmetry and com-binatorial analysis, both total number of skeleton vertices. By means of symmetry and combinatorial analysis, both the chiral and achiral isomers can be enumerased respectively for each substitutional species. For example, species (1~N) means ligands differ completely one another and the number of chiral isomers can be computed by using the following formula
M_c=N!/|G|...
1990, 6(01): 17-22
doi: 10.3866/PKU.WHXB19900104
Abstract:
The electronic structures and conformations of non-polar-substituted 4-n-propyl-fentanyl and polar substituted 4-methoxymethyl-fentanyl and 4-methoxycarbonyl-fentanyl were investigated by the method of quantum mechanics. The results showed that the cause of effect of 4-substituent on biological activity not that change of conformations but that electronic factors. The 4-non-polar-substituents have not con-tribution upon increase of activity. The 4-polar-substituents form new additional negative electronic region, which may be the main assistant site interacting with receptor, the additional negative electrostatic potential region may interact with receptor at a new site or the site in common with amide oxygen. It is no doubt that the additional negative electrostatic potential field generated by the 4-polar-substituent dramatically increases the analgesic activity of the fentanyl derivatives.
The electronic structures and conformations of non-polar-substituted 4-n-propyl-fentanyl and polar substituted 4-methoxymethyl-fentanyl and 4-methoxycarbonyl-fentanyl were investigated by the method of quantum mechanics. The results showed that the cause of effect of 4-substituent on biological activity not that change of conformations but that electronic factors. The 4-non-polar-substituents have not con-tribution upon increase of activity. The 4-polar-substituents form new additional negative electronic region, which may be the main assistant site interacting with receptor, the additional negative electrostatic potential region may interact with receptor at a new site or the site in common with amide oxygen. It is no doubt that the additional negative electrostatic potential field generated by the 4-polar-substituent dramatically increases the analgesic activity of the fentanyl derivatives.
1990, 6(01): 23-31
doi: 10.3866/PKU.WHXB19900105
Abstract:
A LIF technique that employs a varying view field has been developed to give quantitative measurement for the vibrational relaxation rates of I_2 B(v′=43) state in supersonic jets. The data for Ar, N_2 and CO are obtained for the first time. The results have shown that the measured vibrational relaxation rates in cold jets bear an inverse tempeature dependence. For He and H_2 carrier gases, the dominant relaxation process is the usual △v=-1 process. For Ar, N_2 and CO, however, the most probable relaxation pathway is no longer Δv=-1 process, which apparently violates the energy gap law. These observations are adequately explained by a metastable complex formation mechanism.
A LIF technique that employs a varying view field has been developed to give quantitative measurement for the vibrational relaxation rates of I_2 B(v′=43) state in supersonic jets. The data for Ar, N_2 and CO are obtained for the first time. The results have shown that the measured vibrational relaxation rates in cold jets bear an inverse tempeature dependence. For He and H_2 carrier gases, the dominant relaxation process is the usual △v=-1 process. For Ar, N_2 and CO, however, the most probable relaxation pathway is no longer Δv=-1 process, which apparently violates the energy gap law. These observations are adequately explained by a metastable complex formation mechanism.
1990, 6(01): 32-38
doi: 10.3866/PKU.WHXB19900106
Abstract:
The interactions between NO and transition metal surfaces have received consi-derable attention because of the practical importance for NO removal in industrial and automotive catalytic converters. Adsorption-desorption kinetics of NO on Pd(poly) has been studied with Thermal Desorption Spectrum(TDS)and Molecular Beam Relaxation Spectrometry (MBRS) methods. There are three different models (simple, coverage dependence of sticking coefficient and branch process adsorption-desorption models) for explaining experimental results of MBRS in different surface temperature ranges and different modulation frequencies. Best fits to the kinetic parameters characteri-zing the two adsorbed states are as follows:
E_(1d)=104.2±2.7 kmol~(-1), v_(1d)=10~(13.5±0.9)S~(-1)
E_2d=74.4±0.8 kJ mol~(-1), v~(2d)=10~(10.3±0.2)S~(-1)
Finally, the mechanism of unsual adsorbed state ...
The interactions between NO and transition metal surfaces have received consi-derable attention because of the practical importance for NO removal in industrial and automotive catalytic converters. Adsorption-desorption kinetics of NO on Pd(poly) has been studied with Thermal Desorption Spectrum(TDS)and Molecular Beam Relaxation Spectrometry (MBRS) methods. There are three different models (simple, coverage dependence of sticking coefficient and branch process adsorption-desorption models) for explaining experimental results of MBRS in different surface temperature ranges and different modulation frequencies. Best fits to the kinetic parameters characteri-zing the two adsorbed states are as follows:
E_(1d)=104.2±2.7 kmol~(-1), v_(1d)=10~(13.5±0.9)S~(-1)
E_2d=74.4±0.8 kJ mol~(-1), v~(2d)=10~(10.3±0.2)S~(-1)
Finally, the mechanism of unsual adsorbed state ...
1990, 6(01): 39-45
doi: 10.3866/PKU.WHXB19900107
Abstract:
The kinetics of the gas-phase thermal isomerization of epoxypropane has been studied over the temperature range 1045-1175 K in a single-pulse shock tube. Uni-molecular isomerizations to propionaldehyde, acetone, methyl vinyl ether and allylol account for about 65% of the primary reactions which occur by first order, homoge-neous, non-radical processes. Secondary reactions, that make quantitative determina-tion of the individual rate constants difficult, were reduced by the addition of radi-cal scavenger nitric oxide.
k_(propionaldehyde)(s~(-1))=10~(14.3)exp(-262 kJmol~(-1)/RT)
k_(acetone)(s~(-1))=10~(14.0)exp(-268 kJmol~(-1)/RT)
k_(methylvinyl ether)(s~(-1))=10~(13.4)exp(-264 kJmol~(-1)/RT)
k_(allylol)(s~(-1))=10~(13.9)exp(-275 kJmol~(-1)/RT)
A biradical mechanism for the isomerization of epoxypropane has been preferred. It adequately exlained kinetic observations. The RRKM theory of unimolecular reactions was applied to explain the thermal isomerization of epoxypropane.
The kinetics of the gas-phase thermal isomerization of epoxypropane has been studied over the temperature range 1045-1175 K in a single-pulse shock tube. Uni-molecular isomerizations to propionaldehyde, acetone, methyl vinyl ether and allylol account for about 65% of the primary reactions which occur by first order, homoge-neous, non-radical processes. Secondary reactions, that make quantitative determina-tion of the individual rate constants difficult, were reduced by the addition of radi-cal scavenger nitric oxide.
k_(propionaldehyde)(s~(-1))=10~(14.3)exp(-262 kJmol~(-1)/RT)
k_(acetone)(s~(-1))=10~(14.0)exp(-268 kJmol~(-1)/RT)
k_(methylvinyl ether)(s~(-1))=10~(13.4)exp(-264 kJmol~(-1)/RT)
k_(allylol)(s~(-1))=10~(13.9)exp(-275 kJmol~(-1)/RT)
A biradical mechanism for the isomerization of epoxypropane has been preferred. It adequately exlained kinetic observations. The RRKM theory of unimolecular reactions was applied to explain the thermal isomerization of epoxypropane.
1990, 6(01): 46-50
doi: 10.3866/PKU.WHXB19900108
Abstract:
Solubilities of nitrogen in binary mixtures of n-octane and iso-octane have been measured over the temperature range of 20 to 70 ℃ and at pressures up to 130 atm. Experimental results can be fitted by the following equation
lnx_(N_2)=A+Bp_(N_2)+Cp_(N_2)~2+Dlnp
From the experimental results, the partial molar volume of dissolved nitrogen and the Henry's law constants have been calculated.
Solubilities of nitrogen in binary mixtures of n-octane and iso-octane have been measured over the temperature range of 20 to 70 ℃ and at pressures up to 130 atm. Experimental results can be fitted by the following equation
lnx_(N_2)=A+Bp_(N_2)+Cp_(N_2)~2+Dlnp
From the experimental results, the partial molar volume of dissolved nitrogen and the Henry's law constants have been calculated.
1990, 6(01): 51-56
doi: 10.3866/PKU.WHXB19900109
Abstract:
The stability constants of coordination compounds formed from some α-amino acids(αA) DL-P-Fluoro phenylalanine, DL-Serine, DL-Valine, DL-Alanine and α-amino-isobutyric acid with Cu(Ⅱ) were measured by Ion-Selective Electrode at 25±0.1, 35±0.1 and 45±0.1 ℃ in water, 30% ethanol and 50% ethanol solution in the presence of 0. 16 mol·dm~(-3) KNO_3. The order of stability of the Cu(Ⅱ)-αA coordination compounds is in 50% ethanol solution>in 30% ethanol solution>in waterat 35±0.1 ℃.
Linear relationships not only existed between the stability of Cu(II)-αA coordination compouds and the base strength of ligands but also existed between the formation enthalpy of coordination compounds and the protonation enthalpy of the ligands, and between the formation entropy of coordination compounds and the protonation entropy of the ligands as well.
25—45 ℃ ΔH~...
The stability constants of coordination compounds formed from some α-amino acids(αA) DL-P-Fluoro phenylalanine, DL-Serine, DL-Valine, DL-Alanine and α-amino-isobutyric acid with Cu(Ⅱ) were measured by Ion-Selective Electrode at 25±0.1, 35±0.1 and 45±0.1 ℃ in water, 30% ethanol and 50% ethanol solution in the presence of 0. 16 mol·dm~(-3) KNO_3. The order of stability of the Cu(Ⅱ)-αA coordination compounds is in 50% ethanol solution>in 30% ethanol solution>in waterat 35±0.1 ℃.
Linear relationships not only existed between the stability of Cu(II)-αA coordination compouds and the base strength of ligands but also existed between the formation enthalpy of coordination compounds and the protonation enthalpy of the ligands, and between the formation entropy of coordination compounds and the protonation entropy of the ligands as well.
25—45 ℃ ΔH~...
1990, 6(01): 57-61
doi: 10.3866/PKU.WHXB19900110
Abstract:
Electrochemical methods, ESR-Electrochemical methods and Spectroelectrochemical methods have been used to make a detailed study of the electroreduction of phenol red in alkaline DMSO with tetrabutyl ammonium hydroxide as supporting electrolyte. It was found that the free radical thus generated was consumed through a second order disproportionation reaction.
Electrochemical methods, ESR-Electrochemical methods and Spectroelectrochemical methods have been used to make a detailed study of the electroreduction of phenol red in alkaline DMSO with tetrabutyl ammonium hydroxide as supporting electrolyte. It was found that the free radical thus generated was consumed through a second order disproportionation reaction.
1990, 6(01): 62-70
doi: 10.3866/PKU.WHXB19900111
Abstract:
A computer interface technique was applied to the data collecting system of the apparatus for measuring freezing points of mixtures. The sampling of experimental data, the plotting of heating curves and calculating of freezing points and activity coefficients were completed automatically. The apparatus is capable of measuring the freezing point of mixtures with a reproducibility of ±0.001K and the solvent partial molar excess Gibbs free energy with a reproducibility of ±0.1 J mol~(-1).
In this paper, the solvent activity coefficients of binary associated mixtures have been measured for n-propylamine, isopropylamine, n-butylamine, isobutylamine, n-amylamine, isoamylamine, diethylamine, diisoproylamine, triethylamine and tributy-lamine in benzene and p-xylene. The mole fraction concentrations of solute are ranged from 0 to 0.1 and 0 to 0.2 for benzene and p-xylene respectively. The solvent activity coefficients for all systems are greater than unity. A modified three parameter association model, which contained a dimerization constant K_2, a formation to treat the experimental activity coefficients. Under the condition of w=0, this three-parameter model is reduced to the ideall association model. It is shown that the association constants K_2 decrease in the following order:
Primary>secondary amines>>tertiary amines
A similar order...
A computer interface technique was applied to the data collecting system of the apparatus for measuring freezing points of mixtures. The sampling of experimental data, the plotting of heating curves and calculating of freezing points and activity coefficients were completed automatically. The apparatus is capable of measuring the freezing point of mixtures with a reproducibility of ±0.001K and the solvent partial molar excess Gibbs free energy with a reproducibility of ±0.1 J mol~(-1).
In this paper, the solvent activity coefficients of binary associated mixtures have been measured for n-propylamine, isopropylamine, n-butylamine, isobutylamine, n-amylamine, isoamylamine, diethylamine, diisoproylamine, triethylamine and tributy-lamine in benzene and p-xylene. The mole fraction concentrations of solute are ranged from 0 to 0.1 and 0 to 0.2 for benzene and p-xylene respectively. The solvent activity coefficients for all systems are greater than unity. A modified three parameter association model, which contained a dimerization constant K_2, a formation to treat the experimental activity coefficients. Under the condition of w=0, this three-parameter model is reduced to the ideall association model. It is shown that the association constants K_2 decrease in the following order:
Primary>secondary amines>>tertiary amines
A similar order...
1990, 6(01): 71-76
doi: 10.3866/PKU.WHXB19900112
Abstract:
The mechanisms of electrochemical reduction and electrochemical oxidation of Indi Carmine were investigated by means of thin-layer spectroelectrochemical tech-nique at a SnO_2-quartz optically transparent electrode cell.
The formal potentials and electron transfer numbers of the reduction of Indi Carmine were determined at different pHs. The results showed that the reduction of Indi Carmine at SnO_2 electrode is a quasireversible two-electron transfer process and its oxidation is a irreversible electron transfer process. The mechanisms of the electroreduction and electro-oxidation were discussed on the basis of the spectrum recorded in situ during the electrochemical process.
The mechanisms of electrochemical reduction and electrochemical oxidation of Indi Carmine were investigated by means of thin-layer spectroelectrochemical tech-nique at a SnO_2-quartz optically transparent electrode cell.
The formal potentials and electron transfer numbers of the reduction of Indi Carmine were determined at different pHs. The results showed that the reduction of Indi Carmine at SnO_2 electrode is a quasireversible two-electron transfer process and its oxidation is a irreversible electron transfer process. The mechanisms of the electroreduction and electro-oxidation were discussed on the basis of the spectrum recorded in situ during the electrochemical process.
1990, 6(01): 77-82
doi: 10.3866/PKU.WHXB19900113
Abstract:
The existence and thermal stability of H_2O in 12-molybdophosphoric acid (PMA) have been studied by temperature programmed desorption-mass spectrography (TPDMS) and infrared spectrography (IR).
A PMA sample containing 19.1 H_2O/P, H_3(PMo_(12)O_(40))·17.6 H_2O, was prepared, its water content was determined according to Fig.1. The TPD MS spectrum of H_2O (m/z=18) in PMA (solid line Fig.3) was recorded after vacuum outgassing(0.27 Pa) at 290 K (the total time of outgassing in the range 77.4-290 K was 142.5 min). Separated spectra (Fig.3) and their parameters simulated by spectrogram superposition method~[7] and consulting table method~[8] (Table) show that there exist 7 kinds of H_2O in PMA.
In situ IR spectra for PMA at different conditions (Fig.4) revealed...
The existence and thermal stability of H_2O in 12-molybdophosphoric acid (PMA) have been studied by temperature programmed desorption-mass spectrography (TPDMS) and infrared spectrography (IR).
A PMA sample containing 19.1 H_2O/P, H_3(PMo_(12)O_(40))·17.6 H_2O, was prepared, its water content was determined according to Fig.1. The TPD MS spectrum of H_2O (m/z=18) in PMA (solid line Fig.3) was recorded after vacuum outgassing(0.27 Pa) at 290 K (the total time of outgassing in the range 77.4-290 K was 142.5 min). Separated spectra (Fig.3) and their parameters simulated by spectrogram superposition method~[7] and consulting table method~[8] (Table) show that there exist 7 kinds of H_2O in PMA.
In situ IR spectra for PMA at different conditions (Fig.4) revealed...
1990, 6(01): 83-87
doi: 10.3866/PKU.WHXB19900114
Abstract:
The Ni montmorillonite catalyst is prepared from raw bentonite and its activity of catalytic oxidation is evaluated in the desulfuration from liquid phase. The deter-mined and analysed results of DTA and TPR show that the exchangeable Ni-ions between the sheets of the montmorillonite can immediately combine with oxygen to form oxides under higher temperature. The effect of the oxidation on the drop of the catalytic activity of Ni montmorillonite is probably more important than that of the Ni-ions embed in the sheet structure due to heat-activation.
The Ni montmorillonite catalyst is prepared from raw bentonite and its activity of catalytic oxidation is evaluated in the desulfuration from liquid phase. The deter-mined and analysed results of DTA and TPR show that the exchangeable Ni-ions between the sheets of the montmorillonite can immediately combine with oxygen to form oxides under higher temperature. The effect of the oxidation on the drop of the catalytic activity of Ni montmorillonite is probably more important than that of the Ni-ions embed in the sheet structure due to heat-activation.
1990, 6(01): 88-90
doi: 10.3866/PKU.WHXB19900115
Abstract:
In a simple experimental condition without dustproof equipment, satisfactory spherical magnetite particles of narrow size distribution had been obtained by aging ferrous hydroxid gels in the presence of nitrate ion. this note reports a new result according to the modified experimental procedure, in which included the mixed of reactants, elimination of oxygen and magnetic separation etc. According to transmis-sion electron micrographs the mean diameter of particles is about 0.5 μm.
In a simple experimental condition without dustproof equipment, satisfactory spherical magnetite particles of narrow size distribution had been obtained by aging ferrous hydroxid gels in the presence of nitrate ion. this note reports a new result according to the modified experimental procedure, in which included the mixed of reactants, elimination of oxygen and magnetic separation etc. According to transmis-sion electron micrographs the mean diameter of particles is about 0.5 μm.
1990, 6(01): 91-94
doi: 10.3866/PKU.WHXB19900116
Abstract:
With an attempt to improve our proposed one-step method for direct synthesis of CsTmI_3 from CsI:HgI_2:Tm (molar ratio 1: 1: 1) mixture, we have investigated the mechanism of CsTmI_3 formation under this condition by using DTA and X-ray powder diffraction methods. The results obtained indicate that there are two pathways leading to formation of CsTmI_3 from this mixture:The first one involves the reaction between HgI_2 and Tm at 314 ℃ with formation of TmI_2, which, in turn, acts as an interme-diate for CsTmI_3 formation is intermediated by CsHgI_3 (a new phase) formed from CsI and HgI_2 at 210 ℃ and this intermediate will convert to the final product CsTmI_3 in the presence of Tm at 530 ℃.
In addition, we have also studied the phase transition of CsTmI_3. It is found that there are three reversible endo-thermal peaks appeared at 510 ℃, 648 ℃ and 665 ℃ in DTA curve. The X-ray analysis indicated that the peak at 510 ℃ could be assigned at the phase transition of CsTmI_3 and the peak at 665 ℃ is responsible for its melting point. The peak at 648 ℃ seems most likely to be another phase transtion.
With an attempt to improve our proposed one-step method for direct synthesis of CsTmI_3 from CsI:HgI_2:Tm (molar ratio 1: 1: 1) mixture, we have investigated the mechanism of CsTmI_3 formation under this condition by using DTA and X-ray powder diffraction methods. The results obtained indicate that there are two pathways leading to formation of CsTmI_3 from this mixture:The first one involves the reaction between HgI_2 and Tm at 314 ℃ with formation of TmI_2, which, in turn, acts as an interme-diate for CsTmI_3 formation is intermediated by CsHgI_3 (a new phase) formed from CsI and HgI_2 at 210 ℃ and this intermediate will convert to the final product CsTmI_3 in the presence of Tm at 530 ℃.
In addition, we have also studied the phase transition of CsTmI_3. It is found that there are three reversible endo-thermal peaks appeared at 510 ℃, 648 ℃ and 665 ℃ in DTA curve. The X-ray analysis indicated that the peak at 510 ℃ could be assigned at the phase transition of CsTmI_3 and the peak at 665 ℃ is responsible for its melting point. The peak at 648 ℃ seems most likely to be another phase transtion.
1990, 6(01): 95-99
doi: 10.3866/PKU.WHXB19900117
Abstract:
Several ruthenium complexes are prepared and the absorption and emission spe-ctra of their solutions in EtOH-MeOH at room temperature are reported. The emis-sial maxima of three complexes 4-substituted 2,2′-bipyridyls occur between 550-650 nm, there is strong absorption down to 500 nm as dyes for possible use in lumine-scent solar collectors.
1990, 6(01): 100-102
doi: 10.3866/PKU.WHXB19900118
Abstract:
The titled isomerizaton of methylsilene has been studied at ab initio level. Theharmonic vibrational frequencies of reactant, product and transition state, the barrier energy, reaction heat, equilibrium constant and rate constant are calculated. The results indicate that this reaction is exothermic, spontaneous and high temperature above 900 K is favourable for the isomerization. The prediction is in agreement with experiment.
The titled isomerizaton of methylsilene has been studied at ab initio level. Theharmonic vibrational frequencies of reactant, product and transition state, the barrier energy, reaction heat, equilibrium constant and rate constant are calculated. The results indicate that this reaction is exothermic, spontaneous and high temperature above 900 K is favourable for the isomerization. The prediction is in agreement with experiment.
1990, 6(01): 103-106
doi: 10.3866/PKU.WHXB19900119
Abstract:
In this study, Ni-ZrO_2 and Ni-WC composite electrodes were prepared with the technique of composite electroplating, and used in the cathodic reduction reaction of H~+ in acid solution. The electrocatalytic properties and true surface area of the electrodes were determined by electrochemical and physical methods. It was found that the composite electrods had higher catalytic activity than pure Ni plated electrode for reduction reaction of H~+. The effect of content of the particles in the composite electrodes on the electrocatalytic property of the electrodes was discussed. Our results suggest that there is a possibility of preparing various new types composite electrode with electrocatalytic activities for certain redoxreaction system through the technique of composite electroplating by selecting proper materials.
In this study, Ni-ZrO_2 and Ni-WC composite electrodes were prepared with the technique of composite electroplating, and used in the cathodic reduction reaction of H~+ in acid solution. The electrocatalytic properties and true surface area of the electrodes were determined by electrochemical and physical methods. It was found that the composite electrods had higher catalytic activity than pure Ni plated electrode for reduction reaction of H~+. The effect of content of the particles in the composite electrodes on the electrocatalytic property of the electrodes was discussed. Our results suggest that there is a possibility of preparing various new types composite electrode with electrocatalytic activities for certain redoxreaction system through the technique of composite electroplating by selecting proper materials.
