Bimetallic nanoporous Pd–Ag prepared by dealloying with polyvinylpyrrolidone and their electrocatalytic properties
Bimetallic nanoporous Pd–Ag prepared by dealloying with polyvinylpyrrolidone and their electrocatalytic properties
复制标题
聚乙烯吡咯烷酮脱合金制备双金属纳米孔Pd-Ag及其电催化性能
DOI：
10.1088/1361-6528/aae05e
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发表时间：
2018-09
期刊：
影响因子：
3.5
通讯作者：
孙占波
中科院分区：
文献类型：
--
作者：
左家栋;宋衍滟;孙占波
在10wt %的H3PO4溶液中，采用熔纺Al-Pd-Ag带合金化法制备了具有分层结构的双金属纳米多孔Pd-Ag固溶体合金。研究了纳米多孔钯银合金的电催化性能，并与不含银的纳米多孔钯合金进行了比较。实验结果表明，纳米多孔钯银合金的电催化性能优于无银合金。特别的是，优化后的组成表明，在固定85 at% Al合金的前驱体中，Pd/Ag = 3/2的原子比，在纳米多孔Pd - Ag合金中产生的峰值电流密度是纯Pd合金的两倍。在H3PO4溶液中加入1 mM聚乙烯吡罗烷酮（PVP），进一步提高了纳米多孔Pd - ag合金的电催化活性，使其微观结构更加精细，达到纯Pd合金的3倍。其细化机制与PVP大分子吸附对Pd和Ag自由扩散的限制作用有关。PVP与Pd - Ag之间的电子转移和Pd与Ag之间的协同作用双重促进了电催化性能的显著提高。
Bimetallic nanoporous Pd–Ag solid solution alloys with hierarchical structure were prepared by dealloying melt-spun Al–Pd–Ag ribbons in a 10 wt% H3PO4 solution. Electrocatalytic properties of nanoporous Pd–Ag alloys were measured in comparison with the nanoporous Pd without Ag. Experimental results showed that the nanoporous Pd–Ag alloys displayed electrocatalytic properties superior to their Ag-free counterparts. In particular, the optimised composition was revealed to be Pd/Ag = 3/2 in atomic ratio in the precursor with fixed 85 at% Al alloys, which yielded in a peak current density in the nanoporous Pd–Ag alloy two times that of the pure Pd one. The electrocatalytic activity of nanoporous Pd–Ag alloy with refined microstructure was further increased up to three times of the pure Pd one by adding 1 mM polyvinylpyrrolidone (PVP) into the H3PO4 solution. The underlying mechanism of refinement was related to a restriction effect on the free diffusion of Pd and Ag under adsorption of the PVP macromolecules. The significant improvement in the electrocatalytic properties was attributed to the dual promotion by the electron transfer from PVP to Pd–Ag and by a synergistic effect between Pd and Ag.
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影响因子：
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作者：
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DOI：
10.1016/j.elecom.2012.04.023
发表时间：
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期刊：
Electrochemistry Communications (IF=4.859)
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