在乙醇为溶剂和还原剂、碳粉为载体的体系中,采用水热法将Ag+或Ag+-Sn2+还原,形成纳米多孔网状结构的Ag或Ag-Sn双金属纳米颗粒,制备碳粉负载的Ag/C和Ag-Sn/C催化剂.利用循环伏安和线性扫描技术,研究了碱性溶液中这些催化剂对氧还原反应(ORR)的电活性.研究表明,Ag/C和Ag-Sn/C对ORR均表现出强的电催化活性,它们对ORR的起始电位约0.05V(vs.Ag/AgC1).在Ag97Sn3/C催化剂上,ORR的电流密度为2.87×10-3 A/cm2 (800 r/min),高于Ag/C.Levich方程分析表明,在Ag-Sn/C催化剂上,ORR转移电子数明显大于Ag/C,说明在Ag-Sn/C催化剂上,氧气能够较为彻底被还原.此外,在甲醇存在下,Ag/C和Ag-Sn/C对ORR的活性基本保持不变,表明它们对甲醇有较强的耐受力.
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