自支撑镍纳米线阵列电极的制备及电催化性能  

Preparation and Electro-catalytic Property of Self-supported Nickel Nanowire Array Electrode

作　　者：杜孟孟 孙海军[1] 高山 叶小利 乔磊 郭芬 DU Mengmeng;SUN Haijun;GAO Shan;YE Xiaoli;QIAO Lei;GUO Fen(Wuhan Second Ship Design and Research Institute,Wuhan 430064,China;Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials,School of Chemistry and Chemical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉第二船舶设计研究所,武汉430064 [2]武汉科技大学化学与化工学院,煤转化与新型炭材料湖北省重点实验室,武汉430081

出　　处：《高等学校化学学报》2018年第12期2739-2745,共7页Chemical Journal of Chinese Universities

基　　金：湖北省自然科学基金(批准号:2018CFB214);煤转化与新型炭材料湖北省重点实验室开放基金(批准号:WKDM201710)资助

摘　　要：采用低熔点合金和多孔聚碳酸酯模板辅助制备了自支撑镍纳米线阵列电极,并研究了其催化肼电氧化的性能. SEM,XRD和TEM测试结果表明,该电极由镍平板和支撑在其上的镍纳米线阵列构成;镍纳米线的絮状表面增加了电极的比表面积.循环伏安和计时电位测试结果表明,当肼的浓度为24. 6 mmol/L时,该电极的起始氧化电位低至-0. 25 V,氧化电流密度高达163 m A/cm^2;当肼浓度较低时,肼电氧化反应和电极自身的Ni(OH)_2/NiOOH转化反应共存;当肼浓度较高时,仅发生肼电氧化反应;肼的反应分级数约为1,反应活化能为16. 13～21. 24 kJ/mol;镍纳米线阵列电极的一体化、开放式结构使其电催化性能明显优于商业镍片和泡沫镍,并表现出良好的稳定性.A self-supporting nickel nanowire array(NNA)electrode was prepared by using the low?melting point alloy and porous polycarbonate template,and its catalytic performance toward hydrazine electro-oxidation was studied.SEM,XRD and TEM results show that the NNA electrode consists of a nickel plate and nickel nanowire arrays supported on it.The cotton-like surface of nickel nanowires provides the NNA electrode with the additional specific surface area.Cyclic voltammograms and chronopotential measurements show that when the concentration of hydrazine is 24.6 mmol/L,the onset oxidation potential of the electrode is as low as-0.25 V,and the oxidation current density is as high as 163 mA/cm^2.When the concentration of hydrazine is relatively low,the hydrazine electro-oxidation reaction and the Ni(OH)2/NiOOH conversion reaction of the electrode coexist.When the concentration of hydrazine reaches a relatively high level,only hydrazine electro-oxidation occurs.The reaction order of hydrazine species approximately equals to 1,and the reaction activation energy is 16.13-21.24 kJ/mol.The integrated,open structure makes the NNA electrode show significantly better electrocatalytic performance than commercial nickel piece and nickel foam,and exhibit excellent stability.

关 键 词：低熔点合金 多孔模板 纳米线阵列 镍 肼电氧化 

分 类 号：O646[理学—物理化学]