Citation: WANG Chong-Tai, HUA Ying-Jie, SUN Zhen-Fan, WEI Ji-Chong, LI Tian-Lue, TONG Ye-Xiang, LIU Xiao-Yang. Electrochemical Properties of the Dawson-Type Heteropolytungstate Anion P₂W₁₈O₆₂^6- and Its O₂ Reduction Electrocatalysis[J]. Acta Physico-Chimica Sinica, ;2011, 27(02): 473-478. doi: 10.3866/PKU.WHXB20110208 shu

Electrochemical Properties of the Dawson-Type Heteropolytungstate Anion P₂W₁₈O₆₂^6- and Its O₂ Reduction Electrocatalysis

1.
1. School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, P. R. China;
2. School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China;
3. State Key Laboratory of Inorganic Synthesis Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China

Received Date: 2 August 2010
Available Online: 22 December 2010
Fund Project: 国家自然科学基金(20963003) (20963003) 海南重点科技基金(080305, 090803) (080305, 090803) 海南省自然科学基金(509009) (509009)吉林省科技项目(20090595)资助 (20090595)

The electrochemical properties of the Dawson-type heteropolyanion P₂W₁₈O₆₂^6- were studied in detail by cyclic voltammetry, alternating current (AC) voltammetry, and AC impedance. Cyclic voltammetry results revealed that P₂W₁₈O₆₂^6- possessed two pairs of reversible one-electron redox waves and two pairs of reversible two-electron redox waves in a solution containing 0.1 mol·L^-1 Na₂SO₄ and NaHSO₄ (pH 2.52). The peak potential and the peak current of the single-electron wave were independent of the solution pH while the peak potential of the two-electron wave shifted negatively, and the peak current decreased with an increase in solution pH. This indicated that the two-electron electrode process involved H⁺ and the involved H⁺ number was 2. AC impedance spectroscopy showed that the P₂W₁₈O₆₂^6- electrode process was fully controlled by diffusion and the diffusion coefficient (D_O) was 2.5×10^-6 cm²·s^-1. The cyclic voltammograms indicated that significant P₂W₁₈O₆₂^6- electrocatalysis towards O₂ reduction to H₂O₂ occurred as evidenced by the third wave pair and a catalytic efficiency of 300% were obtained. Application of P₂W₁₈O₆₂^6- in the degradation of nitrobenzene in the electro-Fenton-like system containing PW₁₁O₃₉Fe(III)(H₂O)^4- showed a remarkable improvement in terms of degradation efficiency.
- Dawson-type heteropolytungstate anion,
- Electrocatalysis,
- Oxygen reduction,
- Hydrogen peroxide,
- Nitrobenzene degradation
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通讯作者: 陈斌, bchen63@163.com

Electrochemical Properties of the Dawson-Type Heteropolytungstate Anion P₂W₁₈O₆₂^6- and Its O₂ Reduction Electrocatalysis