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碳载钴镍合金纳米电极的制备表征与电催化性能

ISSN号：0438-1157
期刊名称：《化工学报》
时间：0
分类：O646[理学—物理化学;理学—化学]
作者机构：[1]厦门大学固体表面物理化学国家重点实验室,化学化工学院化学系,福建厦门361005
相关基金：国家自然科学基金项目（21222310,21021002,21073152）; 浙江省重中之重学科开放基金项目（20090503）

作者：欧洁连[1], 陈燕鑫[1], 李明轩[1], 许斌斌[1], 王鹏[1], 陈声培[1], 孙世刚[1]

关键词： CoNi, GC电极, 十八面体, 电沉积, 亚硝酸盐还原, 氧还原, CoNi/GC electrode, 18-facet polyhedra, electrodeposition, nitrite reduction, ORR

中文摘要：

采用电化学方法在玻碳（GC）表面电沉积CoNi合金纳米粒子,成功制得碳载CoNi合金纳米电极（CoNi/GC）。SEM结果显示,CoNi粒子呈十八面体结构,粒径约100nm,分布较均匀。选区电子衍射（SAED）结果显示,CoNi合金纳米粒子为单晶结构。XPS结果显示,金属态的Co（0）和Ni（0）占主导地位。性能测试结果表明：CoNi/GC不但对亚硝酸钠具有较好的催化性能,相对于本体Co和本体Ni,CoNi/GC的起始还原电位（Ei）正移约90mV,还原峰电流（jp）增大6～14倍。而且对氧还原亦有较好的电催化活性,CoNi/GC的峰电流密度（jp）和动力电流密度（jk）分别是GC电极的1.7和5.2倍。

英文摘要：

CoNi alloy nanoparticles were synthesized on glassy carbon（GC）electrode（CoNi/GC）by electrochemical deposition.SEM images showed that the prepared CoNi alloy nanoparticles were 18-facet polyhedra with an average particles size of 100 nm,dispersed on the GC electrode surfaces uniformly.The selected area electron diffraction（SAED）pattern showed that CoNi alloy nanoparticles were single crystals.X-ray photoelectron spectroscopy（XPS）showed that the Co（0）and Ni（0）were dominant.The electrocatalytical activities for nitrite reduction of bulk Co,bulk Ni and CoNi/GC electrodes were investigated by cyclic voltammetry（CV）.Onset potential（Ei）of nitrite reduction on CoNi/GC electrode was positively shifted 90 mV,and peak current density（jp）was 6—14 times higher than those of bulk Co and bulk Ni electrode.CoNi/GC electrode also showed an enhancement of electrocatalytical activity towards oxygen reduction reaction,of which peak current density（jp）was 1.7 times and dynamic current density（jk）was 5.2 times higher than those of GC electrode.