Pt-Mo_2C/GC催化甲醇氧化的现场电化学-红外光谱研究  

An In situ FTIR Spectroelectrochemical Study on Methanol Oxidation at Pt-Mo_2C/GC Catalyst

作　　者：黄海萍[1] 姚希宇 沈培康[1] 

机构地区：[1]中山大学光电材料与技术国家重点实验室,广东省低碳化学与过程节能重点实验室,物理科学与工程技术学院,广东广州510275

出　　处：《电化学》2013年第1期83-88,共6页Journal of Electrochemistry

基　　金：国家自然科学基金(No.21073241,No.U1034003)资助

摘　　要：应用离子交换法制备了40%Pt在Mo2C/GC上的电催化剂.X射线衍射(XRD)显示,Pt在Mo2C载体上有较好的分散度,平均粒径为3 nm.循环伏安、计时电位测试表明,酸性溶液中,Pt-Mo2C/GC具有良好的甲醇氧化性能.其催化甲醇氧化的起始电位比Pt/C的负移了90 mV.这一优异性能与Pt和载体Mo2C之间的协同作用有关.现场红外光谱电化学测量显示,甲醇在Pt/C电极氧化的中间产物是桥式吸附COB和线性吸附COL,而在Pt-Mo2C/GC电极则未检测到有害中间产物CO,其氧化终产物均为CO2.A 40% Pt on Mo2C/GC catalyst has been prepared by ion exchange method. The mechanism of methanol electrooxidation on Pt-Mo2C/GC and commercial Pt/C catalysts in acidic media was studied by cyclic voltammetry, XRD measurements and in situ Fourier transform infrared （FTIR） spectroelectrochemistry. The results revealed that the Pt nanoparticles were uniformly dispersed on MozC/GC with an average particle size of 3 nm. The cyclic voltammetric and chronopotentiometric experiments indicated that Pt-Mo2C/GC catalyst exhibited a better performance for methanol oxidation than that of Pt/C in acid solution. A negative shift over 90 mV of the onset potential for methanol oxidation was found on Pt-Mo2C/GC compared with that on Pt/C. The in situ FTIR speetroelectroehemical measurements indicated that the intermediate products of methanol oxidation on Pt/C catalyst were bridge COB and linear COL. No CO was detected on Pt-Mo2C/GC catalyst during the oxidation of methanol by FTIR spectroscopy, indicating the electrooxidation was a non-poisoning process.

关 键 词：电催化 Pt-Mo2C GC PT C 甲醇 现场电化学红外光谱 

分 类 号：O646.54[理学—物理化学]