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Temperature Effect on Hydrogen Evolution Reaction at Au Electrode
Zhi-qiang Tang,Ling-wen Liao,Yong-li Zheng,Jing Kang,Yan-xia Chen*
Author NameAffiliationE-mail
Zhi-qiang Tang Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Ling-wen Liao Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Yong-li Zheng Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Jing Kang Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Yan-xia Chen* Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China yachen@ustc.edu.cn 
Abstract:
The temperature dependence of hydrogen evolution reaction (HER) at a quasi-single crys-talline gold electrode in both 0.1 mol/L HClO4 and 0.1 mol/L KOH solutions was investigated by cyclic voltammetry. HER current displays a clear increase with reaction overpotential (η) and temperature from 278~333 K. In 0.1 mol/L HClO4 the Tafel slopes are found to increases slightly with temperature from 118 mV/dec to 146 mV/dec, while in 0.1 mol/L KOH it is ca. 153±15 mV/dec without clear temperature-dependent trend. The apparent activation energy (Ea) for HER at equilibrium potential is ca. 48 and 34 kJ/mol in 0.1 mol/L HClO4 and 0.1 mol/L KOH, respectively. In acid solution, Ea decreases with increase in η, from Ea=37 kJ/mol (η=0.2 V) to 30 kJ/mol (η=0.35 V). In contrast, in 0.1 mol/L KOH, Ea does not show obvious change with η. The pre-exponential factor (A) in 0.1 mol/L HClO4 is ca. 1 order higher than that in 0.1 mol/L KOH. Toward more negative potential, in 0.1 mol/L HClO4 A changes little with potential, while in 0.1 mol/L KOH it displays a monotonic increase with η. The change trends of the potential-dependent kinetic parameters for HER at Au electrode in 0.1 mol/L HClO4 and that in 0.1 mol/L KOH are discussed.
Key words:  Hydrogen evolution reaction, Au electrode, Temperature effect, Activation energy, Symmetric factor
FundProject:
金电极上氢析出反应的温度效应
汤志强,廖玲文,郑勇力,康婧,陈艳霞*
摘要:
用循环伏安法研究了多晶金电极在0.1 mol/L HClO4和0.1 mol/L KOH中氢析出反应的温度效应.在278~333 K时,随温度和电位的增加氢析出反应电流显著增加, 在酸性溶液中Tafel斜率从118 mV/dec增加到146 mV/dec,超电势从0.2 V增加到0.35 V时,其活化能从37 kJ/mol降低至30 kJ/mol,反应的指前因子比在碱性溶液中的高出一个数量级.在碱性溶液中Tafel斜率约为153±15 mV/dec,且未呈现明显随温度变化的趋势.平衡电位的反应活化能在酸性和碱性溶液中分别约为48和34 kJ/mol.当超电势增加时,在碱性溶液中的指前因子单调增加,在酸性溶液中指前因子不随电位而变化.还讨论了金电极上氢析出反应在酸性和碱性溶液中具有不同的随电势变化的动力学参数的原因及其与反应机理的联系.
关键词:  氢析出反应,金电极,温度效应,活化能,对称因子
DOI:10.1088/1674-0068/25/04/469-474
分类号: