Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopy
Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopy
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DOI：
10.1016/j.electacta.2006.12.007
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发表时间：
2007-05-10
影响因子：
6.6
通讯作者：
Osawa, Masatoshi
中科院分区：
文献类型：
--
作者：
Kunimatsu, Keiji;Senzaki, Takahiro;Osawa, Masatoshi
用表面增强红外吸收光谱和电化学动力学分析（Tafel图）研究了多晶铂电极在氩气吹扫的酸介质中的析氢反应。在2080-2095 cm（-1）处观察到H原子吸附在顶位（末端H）的振动模式。该谱带出现在0.1 V（RHE）处，并在与析氢电流增加平行的更负电位处生长。高信噪比的谱图使我们能够建立末端H的谱带强度（相当于覆盖率）与HER动力学之间的定量关系，由此我们得出结论：末端H原子是HER反应的中间体，两个末端H原子的复合是HER反应的速率控制步骤。红外数据的定量分析还表明，终端H的吸附遵循Frumkin等温线与排斥相互作用。(c)2007爱思唯尔有限公司版权所有。
Hydrogen evolution reaction (HER) on a polycrystalline Pt electrode has been investigated in Ar-purged acids by surface-enhanced infrared absorption spectroscopy and electrochemical kinetic analysis (Tafel plot). A vibrational mode characteristic to H atom adsorbed at atop sites (terminal H) was observed at 2080-2095 cm(-1). This band appears at 0.1 V (RHE) and grows at more negative potentials in parallel to the increase in hydrogen evolution current. Good signal-to-noise ratio of the spectra enabled us to establish the quantitative relation between the band intensity (equivalently, coverage) of terminal H and the kinetics of HER, from which we conclude that terminal H atom is the reaction intermediate in HER and the recombination of two terminal H atoms is the rate-determining step. The quantitative analysis of the infrared data also revealed that the adsorption of terminal H follows the Frumkin isotherm with repulsive interaction. (c) 2007 Elsevier Ltd. All rights reserved.