Ni-Ti-O纳米片/泡沫镍复合电极的显微结构及其电化学性能  

Microstructure and Electrochemical Properties of Ni-Ti-O Nanosheets Supported on Ni Foam

作　　者：陈煜[1] 侯广亚[1] 唐谊平[1] 伍廉奎[1] 曹华珍[1] 郑国渠[1] Chen Yu, Hou Guangya, Tang Yiping, Wu Liankui, Cao Huazhen, Zheng Guoqu(Zhejiang University of Technology, Hangzhou 310014, China)

机构地区：[1]浙江工业大学,浙江杭州310014

出　　处：《稀有金属材料与工程》2018年第10期3134-3140,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51101140);浙江省自然科学基金(LY16E010004)

摘　　要：采用水热合成和热扩渗结合的方法在三维多孔泡沫镍支架上制备了Ni-Ti-O纳米片层。通过扫描电镜(SEM)、X射线衍射(XRD)、透射电镜(TEM)、高分辨透射电镜(HRTEM)对泡沫镍支架上NiO和Ni-Ti-O纳米片结构的微观形貌及物相进行了表征和分析。用循环伏安法和充放电性能测试探究了复合电极对甲醇的催化氧化性能及其电容性能。结果表明:泡沫镍上生长的Ni-Ti-O纳米片物相组成为NiO和TiO,并且为多晶形态;Ti的渗入会使得NiO纳米片中形成氧空位,并和Ni产生协同作用,使得Ni-Ti-O纳米片/泡沫镍电极对甲醇氧化的电催化性能优于Ni(OH)_2/泡沫镍和NiO/泡沫镍电极;在泡沫镍和钛粉质量比(R_(Ni/Ti))为1:24,电流密度为5 mA·cm^(-2)时,Ni-Ti-O电极的面积比电容值为2.15 F·cm^(-2),是纳米Ni(OH)_2/泡沫镍电极的3.2倍(0.67 F·cm^(-2))。Ni-Ti-O nanosheets were fabricated on 3D porous nickel foam by hydrothermal synthesis and thermal diffusion metallizing.Scanning electron microscopy（SEM）,X-ray diffraction（XRD）,transmission electron microscopy（TEM）and high resolution transmission electron microscopy（HRTEM）were used to investigate the micro morphology and phase of NiO and Ni-Ti-O nanosheets.The methanol catalytic performance and capacitance properties of these electrodes were investigated by cyclic voltammetry and charge-discharge tests.The results show that the phase of Ni-Ti-O nanosheets fabricated on 3D porous nickel foam is NiO and TiO with polycrystalline form;The permeation of Ti results in oxygen vacancies in NiO nanosheets and causes synergistic effect with Ni,which makes the electrocatalytic performance of Ni-Ti-O nanosheet electrode for methanol oxidation is much larger than that of Ni（OH）2 and NiO electrodes;When the mass ratio of the Ni foam and the Ti powder（RNi/Ti）is 1：24 and the current density is 5 mA·cm^-2,the area specific capacitance of the Ni-Ti-O electrode is 2.15 F·cm^-2,which is 3.2 times larger than that of Ni（OH）2/Ni foam electrode（0.67 F·cm^-2）.

关 键 词：Ni-Ti-O纳米片 微观组织 水热合成 甲醇催化 电容 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学]