碳载型Pd-Pt-Ag空壳纳米催化剂用于甲酸高效电氧化(英文)  

Carbon Supported Pd-Pt-Ag Hollow Nanocatalysts for Efficient Electrooxidation of Formic Acid

作　　者：张涵轩[1] 蔡文斌[1] 

机构地区：[1]复旦大学化学系,上海市分子催化和功能材料重点实验室,上海200433

出　　处：《复旦学报（自然科学版）》2012年第5期659-664,共6页Journal of Fudan University：Natural Science

基　　金：Project supported by National Natural Science Foundation of China(No.20833005 and 21073045);Science and Technology Commission of Shanghai Municipality(No.11JC140200)

摘　　要：通过Ag纳米颗粒部分置换预先吸附在活性碳表面的PdCl_4^(2-)及PtCl_4^(2-)离子,制备了碳载型Pd-Pt-Ag空壳纳米催化剂.催化剂中不同Pd和Pt比例可通过控制前驱体溶液中的金属浓度方便实现.将得到的二元及三元空壳纳米催化剂用于甲酸电氧化,发现Pd_(2.6)Pt_(0.4)Ag/C表现出了最佳的电催化活性,初步归因于表面活性位的增加及合金协同效应.Carbon supported Pd-Pt-Ag hollow nanocatalysts are synthesized based on partial galvanic replacement of Ag colloidal particles with pre-adsorbed PdCl4^2- and/or PtCl4^2 ions on carbon black surfaces. Different compositions of Pd and Pt can be simply achieved by changing the concentrations of metal ions in the precursor solutions. The as-prepared bimetallic and trimetallic hollow nanostructures are examined as the anode catalysts for formic acid electrooxidation. Among the tested catalysts, the trimetallic Pd2.6Pto.4Ag/C presented the best catalytic activity, due probably to the increased reactive area and the synergetic alloying effect.

关 键 词：甲酸电氧化 空壳纳米催化剂 Pd_Pd_Ag 置换反应 

分 类 号：O646.54[理学—物理化学]