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Citation: Zhang Jiujun*, Ln Juntao, Cha Chuansin, Feng Zigang. IN-SITU FTIR REFLECTION-ABSORPTION SPECTROSCOPIC STUDIES OF CYANIDE ON PLATINUM ELECTRODES[J]. Acta Physico-Chimica Sinica, ;1989, 5(04): 409-414. doi: 10.3866/PKU.WHXB19890407 shu

IN-SITU FTIR REFLECTION-ABSORPTION SPECTROSCOPIC STUDIES OF CYANIDE ON PLATINUM ELECTRODES

1.
Chemistry Department; Wuhan University; Centre of Analysis; Wuhan University

Received Date: 3 December 1987
Available Online: 15 August 1989

The behaviors of cyanide ions on platium electrode were studied using cyclic voltammetry and in-situ FTIR spectroelectrochemistry. The system was 0.5 moIL~(-1) NaCN +0.5 moIL~(-1) NaF/Pt. Four bands near 2076, 2087—2095, 2138 and 2170 cm~(-1) were found when potential changed staircasely from -0.80 to 1.00 V(vs.SCE). These bands were attributed to CN-(2076 cm~(-1)) in the solution, adsorbed CN~-(2087-2095 cm~(-1)), complex compound Pt(CN)_4~(2-) and/or Pt(CN)_2(2138 cm~(-1)) and solution species NCO~- (2170 cm~(-1), respectively. The band near 2087 cm~(-1) for adsorbed CN~- showed blue shift with increasing potential. The experiment results showed that the adsored CN~- existed over the whole potential range studied. Two electrochemical reactions were observed as potential was made more positive than about 0.20 V with the products being Pt(CN)~2_4 and/or Pt(CN)_2 and NCO~- and surface complexes took place, generating CO_2 and N_2.
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