氢气泡模板法制备多孔镍用于电催化氧化乙醇

doi:10.11944/j.issn.1000-0518.2015.10.150087

摘要/Abstract

摘要：

多孔镍通过同时在水溶液中析出氢气及还原镍离子电沉积生成,其在强碱溶液中对乙醇表现出良好的电催化氧化效果。在1 mol/L KOH溶液中,多孔镍的电极反应为准可逆的β-氢氧化镍与β-羟基氧化镍之间质子耦合电子转移。循环伏安图显示峰值电流密度与电势扫描速度平方根成线性关系,据此计算可得多孔镍的质子扩散系数值为2.92×10^-8 cm²/s,其高于块状镍体系的质子扩散系数值约4个数量级,这可能由真实表面积增大导致。循环伏安法和计时电流法用来表征多孔镍对乙醇的电催化氧化能力,相对于(220)镍电极,多孔镍表现出更高的催化效率,计时电流法测量的催化反应速率常数为7.17×10³ cm³/(mol·s)。

关键词: 氢气泡模板法, 多孔镍, 电催化氧化, 乙醇

Abstract:

Porous nickel was electrodeposited by the reduction of nickel ions with the evolution of hydrogen bubble in aqueous solution. This material shows outstanding performance for electrocatalytic oxidation of ethanol in a strong base solution. Quasi-reversible proton coupled electron transfer reaction between β-Ni(OH)₂and β-NiOOH is observed for porous nickel in 1 mol/L KOH solution. From the cyclic voltammograms, a linear relationship between peak current density and square root of potential scan rate is obtained. Based on this relationship, proton diffusion coefficient is calculated to be 2.92×10^-8 cm²/s for porous nickel, which is four order of magnitude higher than that for bulk nickel due to the increased real surface area. Cyclic voltammetry and chronoamperometry have been used to characterize the electrocatalytic oxidation ability of porous nickel toward ethanol. In comparison to Ni(220), porous nickel gives a higher catalytic efficiency. The catalytic reaction rate constant is measured to be 7.17×10³ cm³/(mol·s) by chronoamperometry.

Key words: hydrogen bubble template method, porous nickel, electrocatalytic oxidation, ethanol

张文彬,张长财. 氢气泡模板法制备多孔镍用于电催化氧化乙醇[J]. 应用化学, 2015, 32(10): 1177-1183.

ZHANG Wenbin,ZHANG Zhangcai. Electrocatalytic Oxidation of Ethanol Using Porous Nickel Prepared by Hydrogen Bubble Template[J]. Chinese Journal of Applied Chemistry, 2015, 32(10): 1177-1183.

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