Nafion含量与阴离子吸附对于铂单原子层核壳结构催化剂制备的影响

杨莉君; Dustin Banham; Elod Gyenge; 叶思宇

doi:10.13208/j.electrochem.161243

电化学 >

2017 , Vol. 23 >Issue 2: 170 - 179

DOI: https://doi.org/10.13208/j.electrochem.161243

田昭武先生90大寿祝贺专辑（厦门大学孙世刚林昌健教授主编）

Nafion含量与阴离子吸附对于铂单原子层核壳结构催化剂制备的影响

杨莉君 ,
Dustin Banham ,
Elod Gyenge ,
叶思宇

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1. 巴拉德动力系统，9000 Glenlyon Parkway, Burnaby, 英属哥伦比亚省，加拿大，V5J 5J8; 2. 化学与生物工程学院，英属哥伦比亚大学，2360 East Mall，温哥华，英属哥伦比亚省，加拿大，V6T 1Z3

收稿日期: 2016-12-26

修回日期: 2017-02-23

网络出版日期: 2017-02-23

基金资助

Financial supports to Lijun Yang’s post-doctoral fellowship by MITACS Accelerate Program and Ballard Power Systems are greatly appreciated.

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Impact of Nafion Loading and Anion Adsorption on the Synthesis of Pt Monolayer Core-shell Catalysts

Lijun Yang ,
Dustin Banham ,
Elod Gyenge ,
Siyu Ye

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1. Ballard Power Systems, 9000 Glenlyon Parkway, Burnaby, BC, V5J 5J8 Canada; 2. Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, British Columbia, V6T 1Z3, Canada

Received date: 2016-12-26

Revised date: 2017-02-23

Online published: 2017-02-23

Supported by

Financial supports to Lijun Yang’s post-doctoral fellowship by MITACS Accelerate Program and Ballard Power Systems are greatly appreciated.

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摘要

本实验利用铜的欠电位沉积技术，在旋转圆盘电极上以碳负载的钯纳米颗粒为核，制备铂单原子层核壳结构催化剂. 电化学测试用于表征不同Nafion含量的添加对于核壳结构催化剂制备的影响. 实验证明，Nafion的存在会影响铜的欠电位沉积，铂与铜的置换反应，并决定最终制备的核壳结构催化剂的氧还原催化反应的活性. 当催化剂薄层中Nafion的含量低于5%的时候，添加Nafion不但可以帮助催化剂附着在旋转圆盘电极表面，而且可以保证制备的催化剂具有较好的氧还原反应催化活性. 在H₂SO₄溶液中，钯纳米颗粒的表面存在特殊的阴离子吸/脱附电化学信号峰，这些信号峰可以用来监测Nafion含量对于铂单原子层核壳结构催化剂制备的影响.

关键词： 核壳结构催化剂; 氧气还原反应; 铜欠电位沉积; Nafion含量; 阴离子吸附

本文引用格式

杨莉君 , Dustin Banham , Elod Gyenge , 叶思宇 . Nafion含量与阴离子吸附对于铂单原子层核壳结构催化剂制备的影响[J]. 电化学, 2017 , 23(2) : 170 -179 . DOI: 10.13208/j.electrochem.161243

Abstract

Carbon supported palladium (Pd) nanoparticles were used as a model core material for the synthesis of platinum (Pt) monolayer core-shell catalysts using rotating disk electrode method and a copper (Cu) under potential deposition technique. The impact of Nafion on the synthesis process was revealed by electrochemical testing with various Nafion contents. The existence of Nafion influenced the Cu under potential deposition, galvanic replacement and eventually the oxygen reduction reaction activity of the core-shell catalyst. However, as long as the Nafion content was less than 5 wt% in the test film, adding Nafion could help to bind catalyst onto the surface of electrode while maintaining promising catalytic activity. Unique anion adsorption/desorption peaks were observed on the surface of Pd in H₂SO₄ solution, which turned out to be a useful indicator to evaluate the impact of Nafion on the synthesis of the core-shell catalysts.

Key words： core-shell catalyst, oxygen reduction reaction, ; copper under potential deposition, Nafion content, anions adsorption

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