摘要
采用氩弧熔炼和热处理方法获得PtSb有序金属间化合物材料.用循环伏安和计时电流技术进行电化学性能测试.在含有0.25mol·L-1CH3CH2OH的硫酸溶液中,通过对乙醇电氧化的起始电位和电流密度大小的比较发现,PtSb金属间化合物具有良好的催化乙醇氧化性能.利用XRD和XPS技术分析了晶体结构和电子结构.采用不同扫描速率下的循环伏安技术得到乙醇氧化的电子交换系数(!),发现C2H5OH在PtSb催化剂表面上反应时的!远远大于在Pt电极表面的.
Ordered intermetallic PtSb was synthesized by arc-melting and then sintering treatment. The electrooxidation of liquid ethanol on PtSb was investigated at room temperature by cyclic voltammetry and chronoamperometry. The results were compared with those at a polycrystalline platinum electrode surface. It was found that at the PtSb surface the onset potential for ethanol oxidation was shifted negatively over 200 mV and the current density at PtSb electrode was about six fold as that at Pt electrode. XRD and XPS technologies were used to investigate the crystal structure and electron effect. The results of electrochemical test and ex-site FT-IR test suggested that ethanol decomposition on PtSb favors the reactive intermediate route and the CO intermediate has less effect on PtSb than on Pt. Part of the dynamic parameters of the electrocatalytic oxidation of ethanol on Pt and PtSb electrodes were obtained through the cyclic voltammetry of different scanning speed. The electron exchange coefficient （α） for C2H5OH oxidation on PtSb electrode was much higher than that on Pt electrode.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2005年第9期1006-1010,共5页
Acta Physico-Chimica Sinica
基金
中国博士后科学基金(2004035023)
北京工业大学青年科研基金资助项目~~
关键词
电催化
PtSb
金属间化合物
燃料电池
乙醇
Electrocatalysis, PtSb, Intermetallic compounds, Fuel cells, Ethanol
