Electrochemical impedance study of hydrogen evolution on Bi(001) electrode in the HClO4 aqueous solutions期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

按检索

Electrochemical impedance study of hydrogen evolution on Bi(001) electrode in the HClO4 aqueous solutions

Authors:	Eneli Härk Karmen Lust Alar Jänes Enn Lust

Institution:	(1) Institute of Chemistry, University of Tartu, 2 Jakobi Street, 51014 Tartu, Estonia

Abstract:	Electrochemical impedance spectroscopy has been applied for investigation of the hydrogen evolution kinetics at the electrochemically polished Bi(001) plane, and the complicated reaction mechanism (slow adsorption and charge-transfer steps) has been established. The charge-transfer resistance and adsorption capacitance values depend noticeably on the electrode potential applied. The adsorption resistance is maximal in the region of electrode potential E _min = −0.65 V vs. (Hg\|Hg₂Cl₂\|4 M KCl), where the minimal values of constant phase element (CPE) coefficient Q have been calculated. The fractional exponent α _CPE values of the CPE close to unity (α _CPE ≥ 0.94 and weakly dependent on the electrode potential and pH of solution ( $c_{{\text{HClO}}_4 } \leqslant 2 \times 10^{ - 3} \,{\text{M}}c_{{\text{HClO}}_4 } \leqslant 2 \times 10^{ - 3} \,{\text{M}}$ ) have been obtained, indicating the weak deviation of Bi(001)\|HClO₄ + H₂O interface from the ideally flat capacitive electrode. Q differs only very slightly from double-layer capacitance C _dl values in the whole region of potentials and $c_{{\text{HClO}}_{\text{4}} } c_{{\text{HClO}}_{\text{4}} }$ , investigated.

Keywords:	Impedance Bismuth single crystal Cathodic hydrogen evolution
本文献已被 SpringerLink 等数据库收录！

设为首页 | 免责声明 | 关于勤云 | 加入收藏