应用化学

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氮掺杂石墨炭包覆的钴纳米催化剂作高效、高稳定性电催化制氢

李新杰a,徐鹤a,于美a,张超b,郭安儒a,刘畅c*()   

  1. a航天材料及工艺研究所 北京 100076
    b北京航空航天大学材料科学与工程学院 北京 100191
    c中国科学院长春应用化学研究所 长春 130022
  • 收稿日期:2018-08-15 出版日期:2019-05-01
  • 通讯作者: 刘畅
  • 基金资助:
    中国科协青年人才托举工程第三届(2017-2019)项目(2017QNRC001)

Nitrogen-Doped Graphitic Carbon Coated Cobalt Nanocatalysts for Highly Efficient and Durable Hydrogen Evolution Reaction

LI Xinjiea,XU Hea,YU Meia,ZHANG Chaob,GUO Anrua,LIU Changc*()   

  1. aAerospace Research Institute of Materials & Processing Technology,Beijing,100076,China;
    bDepartment of Materials Science and Engineering,Beihang University,Beijing 100191,China
    cChinese Academy of Sciences,Changchun Institute of Applied Chemistry,Changchun,100032,China
  • Received:2018-08-15 Published:2019-05-01
  • Contact: LIU Chang
  • Supported by:
    Supported by the Young Elite Scientists Sponsorship Program by CAST(No.2017QNRC001)

摘要:

电催化制氢是解决当前能源危机的重要手段之一。 研究高效稳定的非贵金属电催化剂是电催化制氢商业应用的重点。 本文通过直接高温热解双金属沸石咪唑骨架,制备了一种氮掺杂石墨炭(NC)包覆均匀分布的钴纳米颗粒电催化剂(V-Co@NC,这里V是vacancy缩写),前躯体中的Zn元素有效地防止钴纳米颗粒的聚集,并有助于生成均匀分布的钴纳米颗粒。 这种特殊的纳米结构可防止钴与电解液的直接接触,提升了其循环稳定性,同时,氮元素的掺杂提升了导电性,有利于电催化制氢性能的提升。 结果表明,所制备的V-Co@NC催化剂在酸性和碱性电解液中均具有良好的催化性能,且经过5000次循环测试后催化活性基本保持不变,具有良好的应用前景。为高活性和高选择性的电催化制氢催化剂的发展提供一种全新的途径。

关键词: 制氢, 电催化, 非贵金属催化剂, 高稳定性

Abstract:

Electrocatalytic hydrogen evolution reaction(HER) provides one of the most important pathways for the crisis of energy consumption. The research of both highly efficient as well as highly stable non-noble metal electrocatalysts is the key point of commercial application of HER. In this paper, through direct pyrolysis of bimetallic ZnCo zeolitic imidazolate frameworks(ZIFs), the electrocatalyst of evenly distributed Co nanoparticle coated by nitrogen-doped graphitic carbon(V-Co@NC, V, vacancy) could be easily prepared. The existence of Zn element in the precursor could prevent efficiently the aggregation of Co nanoparticles, and help for the formation of uniformly distributed Co nanoparticles. Such unique nanostructure prevents direct contact between cobalt and electrolyte, promots their durability. Meanwhile, the existence of nitrogen dopants enhances the conductivity of catalyst, and contributes to the HER activity greatly. As a result, as-prepared V-Co@NC catalyst exhibits high electrocatalytic activity towards HER in both acidic and alkaline electrolyte, meanwhile the activity remains stable even after 5000 cycles. These performances indicate promising commercial application of the V-Co@NC catalyst. This work opens a new way for the development of HER electrocatalysts with both high activity and stability.

Key words: hydrogen evolution reaction, electrocatalysis, non-noble metal electrocatlysts, high durability