摘要
采用还原碳化法制备了碳化钨样品,并用原位还原法担载Pt粒子得到Pt/WxCy催化剂.利用计时电流技术对Pt/WxCy和常规Pt/C催化剂进行氧化处理,并用循环伏安法测试了氧化前后两种催化剂的电化学活性面积.将两种催化剂制成单电池,对比研究了其氧化后的性能衰减.结果表明,Pt/WxCy催化剂制成的单电池抗氧化能力显著高于普通Pt/C制成的单电池.
Electrochemical oxidation of carbon supports for Pt/C catalysts can cause degradation of proton exchange membrane fuel cells （PEMFCs）. To improve the oxidation resistance of the catalyst supports, tungsten carbide （WxCy） was investigated as a substitute for carbon supports in PEMFCs. The Pt/C and Pt/WxCy samples were oxidized using the chronoamperometry method. The electrochemical active area of the two samples was measured using cyclic voltammetry. Furthermore, the Pt/C and Pt/WxCy catalysts were applied to single cells to compare their performance degradation after oxidation. As a result, the single cell prepared with Pt/WxCy catalyst showed higher oxidation resistance than the contrastive cell prepared with Pt/C catalyst.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期109-111,共3页
基金
国家自然科学基金(20636060)
国家高技术研究发展计划(863计划
2005AA501660).
关键词
碳化钨
碳
催化剂载体
铂
燃料电池
抗氧化性能
tungsten carbide
carbon
catalyst support
platinum
fuel cell
oxidation resistance
