高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (5): 1083-1090.doi: 10.7503/cjcu20190660

• 物理化学 • 上一篇    下一篇

铁镍合金催化剂的结构调控及对电化学析氧反应的催化性能

刘璐1,2,伍含月1,李静1,*(),佘岚3,*()   

  1. 1. 重庆大学化学化工学院
    2. 材料科学与工程学院, 重庆 400044
    3. 第二军医大学药学院, 上海 200433
  • 收稿日期:2019-12-12 出版日期:2020-05-10 发布日期:2020-02-24
  • 通讯作者: 李静,佘岚 E-mail:lijing@cqu.edu.cn;slgs4100@126.com
  • 基金资助:
    国家自然科学基金(21878030);重庆市留学人员回国创新支持项目(CX2018052)

Tuning Microstructures of Iron-Nickel Alloy Catalysts for Efficient Oxygen Evolution Reaction

LIU Lu1,2,WU Hanyue1,LI Jing1,*(),SHE Lan3,*()   

  1. 1. College of Chemistry and Chemical Engineering
    2. College of Materials Science and Engineering,Chongqing University, Chongqing 400044, China
    3. College of Pharmacy, The Second Military Medical University, Shanghai 200433, China
  • Received:2019-12-12 Online:2020-05-10 Published:2020-02-24
  • Contact: Jing LI,Lan SHE E-mail:lijing@cqu.edu.cn;slgs4100@126.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(21878030);the Venture & Innovation Support Program for Chongqing Overseas Returnees, China(CX2018052)

摘要:

以碳纤维纸(CFP)为基底材料, 通过水热生长铁镍前驱体、 多巴胺包覆和焙烧转化的方法制备出FeNi合金纳米颗粒@氮掺杂碳(FeNi alloy@NC)复合催化剂. 通过改变反应体系中Fe/Ni前驱体的摩尔比可改变合金组成为Fe0.64Ni0.36和FeNi3, 同时催化剂微观结构也由纳米管状变为花状团簇以及片层结构. 在碱性介质中进行电化学析氧反应测试, 发现 FeNi3@NC(1∶3)催化剂表现出了最优的催化活性和稳定性, 合金颗粒与NC层的协同相互作用、 NC保护层的构建以及催化剂的三维微观立体结构是催化剂性能优异的主要原因.

关键词: 铁镍合金, 析氧反应, 纳米粒子, 催化剂, 电化学

Abstract:

N-doped carbon(NC) coated iron-nickel alloy catalysts loaded on the carbon fiber papers(CFP) were prepared by firstly hydrothermal depositing iron-nickel based hydroxide/carbonates, then coating dopamine on their surface, and finally annealing the materials. Particularly, the active alloy species can be tuned to be Fe0.64Ni0.36 and FeNi3 and the microscopic structures of the catalysts show to be nanotubes, nanoflowers and nanosheets upon different atomic ratio of Fe2+ to Ni2+. In an alkaline media, the FeNi3@NC(1∶3) catalyst exhibits superior oxygen evolution reaction catalytic activities, which only requires an overpotential of 277 mV to reach a current density of 20 mA/cm2. At the same time, FeNi3@NC(1∶3) displays no obvious activity loss after continuous running for 30 h at 20 mA/cm2, indicating a good durability. The excellent performances of the alloy catalysts in alkaline solution can be ascribed to their microstructural features: (1) The composites made by NC shell and alloy cores create copious active sites; (2) The NC coating layer prevents the erosion of alloy nanoparticles which thus improves the durability; (3) The three-dimensional structures well promote mass transfer and effectively suppress the gas peeling effect.

Key words: Iron-nickel alloy, Oxygen evolution reaction, Nanoparticles, Catalyst, Electrochemistry

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