Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study
Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study
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DOI：
10.3390/app9245301
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
J. Juodkazytė;K. Juodkazis;I. Matulaitienė;B. Šebeka;I. Savickaja;A. Balčytis;Y. Nishijima;G. Niaura;S. Juodkazis
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文献类型：
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作者：
J. Juodkazytė;K. Juodkazis;I. Matulaitienė;B. Šebeka;I. Savickaja;A. Balčytis;Y. Nishijima;G. Niaura;S. Juodkazis
本研究利用表面增强拉曼光谱（SERS）探测了在0.1 M KOH的h2o和d2o（重水）溶液中，不同电位E值的纳米结构Cu/CuO和Cu/CuO/Pd电极表面发生的过程，并对实验条件下发生的电化学反应进行了分析。在1328 ~ 1569 cm−1的E值范围（+0.3 V ~ 0 V）内，Cu/CuO/Pd电极（标准氢电极（SHE））的SERS谱带与表面吸附或弱结合的物质的存在一致，其相互作用能接近15 ~ 21 kJ mol−1。这些条带可以归因于在Cu/CuO/Pd电极上发生的可逆析氢和氧化反应（HER/HOR）中，ad（ab）吸附了（h2o +） ad、（h2 +） ab和（h2 +） ad离子作为中间体。未观察到同位素效应；这与吸附的（h3o +） ad和（h2 +） ad或（d3o +） ad和（d2 +） ad的电子-离子对形成的偶极子性质一致。根据文献数据，125-146 cm−1和~ 520-565 cm−1的SERS波段被分配给Cu(I)和Cu（II）氧。这些发现证实了定量的逐步减水机制。
In this study, the processes taking place on the surfaces of nanostructured Cu/CuO and Cu/CuO/Pd electrodes at different potential, E, values in the solutions of 0.1 M KOH in H 2 O and D 2 O (heavy water) were probed by surface enhanced Raman spectroscopy (SERS), and the analysis of electrochemical reactions occurring under experimental conditions is presented. The bands of the SERS spectra of the Cu/CuO/Pd electrode observed in the range of E values from +0.3 V to 0 V (standard hydrogen electrode (SHE)) at 1328–1569 cm − 1 are consistent with the existence of species that are adsorbed or weakly bound to the surface with the energy of interaction close to 15–21 kJ mol − 1 . These bands can be attributed to the ad(ab)sorbed (H 3 O + ) ad , (H 2 + ) ab , and (H 2 + ) ad ions as intermediates in reversible hydrogen evolution and oxidation reactions (HER/HOR) taking place on the Cu/CuO/Pd electrode. There was no isotopic effect observed; this is consistent with the dipole nature of the electron-ion pair formation of adsorbed (H 3 O + ) ad and (H 2 + ) ad or (D 3 O + ) ad and (D 2 + ) ad . In accordance with the literature data, SERS bands at 125–146 cm − 1 and ∼520–565 cm − 1 were assigned to Cu(I) and Cu(II) oxygen species. These findings corroborate the quantitative stepwise mechanism of water reduction.