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

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.