高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (4): 682.doi: 10.7503/cjcu20150882

• 物理化学 • 上一篇    下一篇

原位负载Au纳米层在锂空气电池正极中的电催化特性

张蕾1, 刘清华1, 段晓波1(), 华小虎1, 朱丁2, 陈云贵2   

  1. 1. 西安科技大学材料科学与工程学院, 西安 710054
    2. 四川大学材料科学与工程学院, 成都 610064
  • 收稿日期:2015-11-19 出版日期:2016-04-10 发布日期:2016-03-22
  • 基金资助:
    西安科技大学培育基金(批准号: 2014004)资助

In situ Formed Au Nanolayer as a Bifunctional Catalyst for Li-air Batteries

ZHANG Lei1, LIU Qinghua1, DUAN Xiaobo1,*(), HUA Xiaohu1, ZHU Ding2, CHEN Yungui2   

  1. 1. College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    2. School of Materials Science and Engineering, Sichuan University, Chengdu 610064, China
  • Received:2015-11-19 Online:2016-04-10 Published:2016-03-22
  • Contact: DUAN Xiaobo E-mail:xiaobo12558@163.com
  • Supported by:
    † Supported by the Foundation for Young Scholars of Xi’an University of Science and Technology, China(No.2014004)

摘要:

通过自发交换法使Au与非水性锂空气电池中的泡沫镍集流体发生反应, 实现了金纳米层催化剂的原位负载. 将其作为非水性锂空气电池正极, 研究了不同气氛(纯氧、 大气和模拟大气)下电池的电化学性能. 结果表明, Au纳米层催化剂对氧还原反应/氧逸出反应起到了双功能催化作用, 使得氧气电极在不同气氛下的首次放电容量与电压均显著提升, 容量分别提升至9169, 1604和1853 mA·h/gcarbon; 同时氧气电极在模拟大气下的充电过电位降低, 能量效率提高, 循环性能得到一定提升.

关键词: 锂空气电池, Au双功能催化剂, 环境气氛, 自发交换法

Abstract:

Au nanolayers(ANL) were in situ formed on the Ni foam(SP) via the galvanic exchange method. The as-prepared ANL/SP was applied as the current collector of air cathode for the Li-air battery which operated in pure O2, ambient air and simulated air. The electrochemical performances of ANL/SP electrode for Li-O2 battery were investigated. The results showed that the in situ incorporation of ANL significantly improves the energy output and the cycling performance of the aprotic Li-O2 battery in ambient or simulated air, and effectively facilitates the oxygen reduction/evolution reactions(ORR/OER) kinetics of the O2 electrode in simulated air.

Key words: Li-air battery, Au bifunctional catalyst, Air atmosphere, Spontaneous exchange

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