碱性介质中甲醇在PdNi/MWCNT上的电化学氧化  

Methanol Electrooxidation on PdNi/MWCNT in an Alkaline Medium

作　　者：张宇[1] 陈维民[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110159

出　　处：《沈阳理工大学学报》2012年第4期68-71,共4页Journal of Shenyang Ligong University

基　　金：辽宁省教育厅高校科研计划项目(2009B154)

摘　　要：采用乙二醇还原方法制备直接甲醇燃料电池阳极PdNi/MWCNT催化剂。通过循环伏安、线性扫描、计时电流及电化学阻抗谱等测试,研究PdNi/MWCNT在碱性介质中对甲醇电氧化反应的催化性能。结果表明,与Pd/MWCNT相比,PdNi/MWCNT具有较高的甲醇氧化活性,Ni的引入加速了中间物种的氧化,使甲醇氧化反应在较低电位发生;PdNi/MWCNT显示出较低的活性衰减速率,表明其具有良好的抗中毒能力。An anode catalyst PdNi/MWCNT for direct methanol fuel cells was prepared by the ethylene glycol reduction method. The catalytic activity of PdNi/MWCNT toward meth- anol oxidation in an alkaline medium was examined by electrochemical methods such as cy- clic voltammetry （ CV）, liner sweep voltammetry （ LSV ） , electrochemical impendance spectra （EIS） and chronoamperometry （CA）. The results show that, compared with Pd/ MWCNT, PdNi/MWCNT has a higher catalytic activity toward methanol oxidation. The introduction of Ni accelerates the electrooxidation of intermediates so that the methanol oxi- dation reaction occurs at a relatively low potential. In addition, PdNi/MWCNT exhibits a low activity-loss rate, implying a good poison resistance.

关 键 词：电催化剂 甲醇 电氧化 PdNi 

分 类 号：TM911.4[电气工程—电力电子与电力传动]