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 P2W18O626- and Its O2 Reduction Electrocatalysis[J]. Acta Physico-Chimica Sinica,
;2011, 27(02): 473-478.
doi:
10.3866/PKU.WHXB20110208
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The electrochemical properties of the Dawson-type heteropolyanion P2W18O626- were studied in detail by cyclic voltammetry, alternating current (AC) voltammetry, and AC impedance. Cyclic voltammetry results revealed that P2W18O626- 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 P2W18O626- electrode process was fully controlled by diffusion and the diffusion coefficient (DO) was 2.5×10-6 cm2·s-1. The cyclic voltammograms indicated that significant P2W18O626- electrocatalysis towards O2 reduction to H2O2 occurred as evidenced by the third wave pair and a catalytic efficiency of 300% were obtained. Application of P2W18O626- 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.
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