化工学报 ›› 2020, Vol. 71 ›› Issue (6): 2821-2829.DOI: 10.11949/0438-1157.20191040

• 材料化学工程与纳米技术 • 上一篇    下一篇

ZIF-67衍生Co/NC多孔碳材料的改性及其电催化水氧化性能

邹雷1(),刘国强1,2(),江苗苗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
  • 收稿日期:2019-09-19 修回日期:2020-01-06 出版日期:2020-06-05 发布日期:2020-06-05
  • 通讯作者: 张卫新
  • 作者简介:邹雷(1996—),男,硕士研究生,2018110434@hfut.edu.cn|刘国强(1989—),男,博士后,hfuugqliu@163.com
  • 基金资助:
    国家自然科学基金项目(91834301);安徽省重大科技专项(201903a05020021);中央高校基本科研业务费专项资金(JZ2019HGBH0204)

Preparation and modification of ZIF-67 derived Co/NC porous carbon composite for electrocatalytic oxygen evolution reaction

Lei ZOU1(),Guoqiang LIU1,2(),Miaomiao JIANG1,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:2019-09-19 Revised:2020-01-06 Online:2020-06-05 Published:2020-06-05
  • Contact: Weixin ZHANG

摘要:

通过将前体ZIF-67高温热解并采用NaBH4还原的方法制得表面富含氧空位的多孔碳复合材料(R-Co/NC-800)。利用X射线衍射(XRD)、场发射扫描电镜(FESEM)、高分辨透射电镜(HRTEM)、X射线光电子能谱仪(XPS)等手段对材料的物相、形貌、元素分布以及表面化学键结构等进行了表征;采用线性扫描伏安法(LSV)等方法研究了材料的电催化水氧化活性。结果表明制得的多孔碳复合材料(R-Co/NC-800)与未经NaBH4还原处理的Co/NC-800样品对比,其表面氧空位浓度明显增加,形成新的催化活性位点,有效提升了电催化水氧化活性。在1.0 mol/L KOH溶液中,达到10 mA/cm2的电流密度,所需过电势仅为287 mV,同时表现出优异的电化学稳定性。

关键词: ZIF-67, 热解, 多孔碳, 复合材料, NaBH4, 还原, 氧空位, 水氧化

Abstract:

A porous carbon composite (R-Co / NC-800) with oxygen vacancies on its surface was prepared by pyrolyzing the precursor ZIF-67 at high temperature and using NaBH4 reduction. The structure, morphology, element distribution and valence state of the as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), high resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectroscope (XPS), respectively. The electrocatalytic performance of the as-prepared catalysts for oxygen evolution reaction (OER) was investigated by linear polarization curve (LSV) measurements. The R-Co/NC-800 with rich oxygen vacancies as electrocatalytic active sites and high specific surface area to expose amounts of unsaturated coordinate metal species after reconstruction the surface of Co/NC-800 via NaBH4 solution, which exhibits higher catalytic activity for OER, delivering a current density of 10 mA/cm2 at a low overpotential (287 mV) than that of Co/NC-800 (363 mV) in 1.0 mol/L KOH media, as well as outstanding long-term electrochemical durability.

Key words: ZIF-67, pyrolysis, porous carbon, composite, NaBH4, reduction, oxygen vacancy, water oxidation

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