摘要
提出了以水合肼为还原剂,采用水热法制备链状结构的钛基镍(Ni/Ti)催化剂的新方法,对其微观形貌和电催化性能进行了表征.扫描电镜(SEM)及能谱分析(EDS)测试结果表明,以钛为基体提高了Ni金属粒子的分散度,颗粒大小均匀,约500nm,形成链状结构.循环伏安、线性扫描、交流阻抗实验结果表明,水热法制备的Ni/Ti催化剂对甲醇氧化的电催化活性远高于多晶镍电极,其氧化峰电流是多晶镍电极上的5倍.在甲醇氧化活性范围内,Ni/Ti电极在含甲醇的碱性溶液中电荷传递电阻Rct较低,并且Rct随着施加电位和甲醇浓度增大依次减小,表现出稳定的电催化活性.
A novel titanium-supported nickel electrode （Ni/Ti） with catenulate structures was successfully fabricated with the hydrothermal processes by using hydrazine as a reduction agent. SEM and EDS characterization results indicated Ni/Ti catalyst exhibited a high and homogeneous dispersion of metal particles with sizes of ～500nm.It was shown from cyclic voltammograms in alkaline solutions that oxidation current of methanol on the Ni/Ti was much higher than that on a polycrystalline nickel （Ni）, and that the oxidation peak current on the Ni/Ti was five times higher than on Ni. Electrochemical impedance spectra on the Ni/Ti revealed that the presence of methanol in 1mol/L NaOH enhanced the charge transfer process of the oxidation of Ni （OH）2 to NiOOH. In the activation range of methanol oxidation, the charge transfer resistance decreased with the increase of anodic potentials and methanol concentrations. This novel nickel electrode can be used repeatedly and exhibits stable electroeatalytic activity for the methanol. 6figs., 1 tab., 27refs.
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2009年第2期89-94,共6页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(20876038)
教育部留学回国人员科研启动基金资助项目([2007]1108)
湖南省教育厅重点基金资助项目(07A019)
湛江师范学院校级课题资助项目(QL0803)
关键词
钛基镍
电催化
甲醇氧化
水热法
titanium-supported nickel
electro-catalyst
methanol oxidation
hydrothermal process
