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pH Effect on Oxidation of Hydrogen Peroxide on Au(111) Electrode in Alkaline Solutions
Jiao-jiao Li, Jie Wei, Jun Cai, Yan-xia Chen*
Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:
The hydrogen peroxide oxidation reaction (HPOOR) on Au(111) electrode in alkaline solutions with pH values ranging from 10 to 13 was examined systematically. HPOOR activity increased and the slope of the i-E curve decreased with increasing pH. HO2- is suggested to be the main reactive intermediate for HPOOR in alkaline media. The fast kinetics for HPOOR in alkaline solution is facilitated by the electrostatic interaction between the positively charged electrode and the reactive anions (i.e., HO2- and HO-), which increases the concentration of these reactants and the thermodynamic driving force for HO2- oxidation at the reaction plane.
Key words:  Oxidation of hydrogen peroxide, Au(111) electrode, pH effect, Electrostatic interaction
FundProject:
Au(111)上过氧化氢在碱性介质中氧化反应的pH效应
李皎皎, 魏 杰, 蔡 俊, 陈艳霞*
中国科学技术大学化学物理系,合肥微尺度物质科学国家研究中心,合肥 230026
摘要:
本文经过系统地研究Au(111)上过氧化氢在pH值从10到13的不同碱性溶液体系中氧化反应(HPOOR),发现随着溶液pH的增大,HPOOR的活性增大,电流电势i-iE极化曲线的斜率减小. HO2-是碱性溶液中HPOOR的主要反应物种,在高pH溶液下有很快的动力学反应主要是由于电极表面的正电荷与体系中的阴离子HO2-和OH-等有静电相互作用的原因. 因此在溶液反应物随pH增大的时候,热力学的驱动力也加快了HO2-的氧化过程.
关键词:  H2O2的氧化反应,Au(111)电极,pH效应,静电相互作用
DOI:10.1063/1674-0068/31/cjcp1804064
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