CIESC Journal ›› 2020, Vol. 71 ›› Issue (6): 2840-2849.DOI: 10.11949/0438-1157.20200207

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Self-sacrificing templated preparation of nitrogen-doped molybdenum carbide/carbon as hydrogen evolution electrocatalyst

Xiaoming FAN1,2(),Xikui CHEN1,Zihan WANG1,Shuai CAO1,Fengru CHENG1,Zeheng YANG1,Weixin ZHANG1()   

  1. 1.School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
    2.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
  • Received:2020-02-28 Revised:2020-04-13 Online:2020-06-05 Published:2020-06-05
  • Contact: Weixin ZHANG

自牺牲模板法制备氮掺杂碳化钼/碳析氢电催化剂

范小明1,2(),陈希奎1,汪子涵1,曹帅1,程凤如1,杨则恒1,张卫新1()   

  1. 1.合肥工业大学化学与化工学院,安徽 合肥 230009
    2.合肥工业大学材料科学与工程学院,安徽 合肥 230009
  • 通讯作者: 张卫新
  • 作者简介:范小明(1986—),男,博士,讲师,xmfan@hfut.edu.cn
  • 基金资助:
    国家自然科学基金项目(21808046);中国博士后科学基金资助项目(2018M630701);安徽省科技重大专项(17030901067)

Abstract:

Using g-C3N4 as self-sacrificing template and nitrogen source, glucose as carbon source, and ammonium molybdate as molybdenum source, nitrogen-doped molybdenum carbide modified carbon nanosheets (N-Mo2C/C) with two-dimensional nanostructures were prepared and evaluated its electrocatalytic hydrogen evolution performance. X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), Raman spectroscopy, etc. were employed to analyze the compositions, morphologies and microstructures of the as-prepared N-Mo2C/C. The results show that ultrafine nitrogen-doped Mo2C nanoparticles with a diameter of 3—5 nm can be uniformly distributed on the 2D carbon nanosheets. The electrocatalytic performances of N-Mo2C/C for hydrogen evolution were tested by using an electrochemical workstation, which demonstrates that the N-Mo2C/C only exhibits an overpotential of 185 mV at 10 mA/cm2 in 1 mol/L KOH solution, and a stable hydrogen evolution potential could be maintained for 20 h in a long-term cycling test.

Key words: molybdenum carbide, nanomaterials, electrochemistry, catalyst, hydrogen evolution performance

摘要:

采用g-C3N4为自牺牲模板和氮源,葡萄糖为碳源,钼酸铵为钼源,制备具有二维纳米结构的氮掺杂碳化钼修饰碳纳米片(N-Mo2C/C),并评价其电催化析氢性能。利用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)、拉曼(Raman)等测试手段对N-Mo2C/C的组成、形貌及结构进行分析。结果表明,氮掺杂的Mo2C纳米颗粒均匀分散在二维碳纳米片上,粒径主要分布在3~5 nm。利用电化学工作站测试 N-Mo2C/C的电催化析氢性能,在1 mol/L KOH溶液中,电流密度为10 mA/cm2时其对应的过电势为185 mV,Tafel斜率为69 mV/dec,经20 h循环可维持稳定的析氢电势。

关键词: 碳化钼, 纳米材料, 电化学, 催化剂, 析氢性能

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