高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (10): 2265.doi: 10.7503/cjcu20180226

• 物理化学 • 上一篇    下一篇

Cu掺杂SnO2阴极材料的制备及低过电位下对CO2的电催化还原

胡雪艳1, 王娜2, 郝玉婷2, 许志庆2, 王明慧2, 师改琴2, 杨慧敏1(), 梁镇海1,2()   

  1. 1. 太原理工大学化学化工学院, 2. 太原理工大学现代科技学院, 太原 030024
  • 收稿日期:2018-03-22 出版日期:2018-09-29 发布日期:2018-09-29
  • 作者简介:

    联系人简介: 杨慧敏, 女, 博士, 讲师, 主要从事光电催化研究. E-mail: yanghuimin@tyut.edu.cn;梁镇海, 男, 博士, 教授, 博士生导师, 主要从事光电催化研究. E-mail: liangzhenhai@tyut.edu.cn

  • 基金资助:
    国家自然科学青年基金(批准号: 51703151)、 太原理工大学校基金(批准号: 1205-04020202)和山西省大学生创新项目(批准号: 2018846)资助.

Preparation of Cu Doped SnO2 Cathode Material for Electroreduction of Carbon Dioxide at Low Overpotential

HU Xueyan1, WANG Na2, HAO Yuting2, XU Zhiqing2, WANG Minghui2, SHI Gaiqin2, YANG Huimin1,*(), LIANG Zhenhai1,2,*()   

  1. 1. College of Chemistry and Chemical Engineering, 2. Polytechnic Institute, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2018-03-22 Online:2018-09-29 Published:2018-09-29
  • Contact: YANG Huimin,LIANG Zhenhai E-mail:yanghuimin@tyut.edu.cn;liangzhenhai@tyut.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.51703151), the Foundation of Taiyuan University of Technology, China(No.1205-04020202) and the Shanxi University Student Innovation Project, China(No.2018846).

摘要:

以无机盐SnCl4·5H2O为前驱体, CuCl2为掺杂剂通过一步水热法制备了Cu掺杂SnO2阴极材料. 采用扫描电子显微镜(SEM)、 X射线衍射(XRD)和X射线光电子能谱(XPS)对该物质的形貌、 晶型结构和元素组成及价态进行表征. 在常温常压下于0.5 mol/L NaHCO3溶液中, 通过循环伏安曲线、 塔菲尔(Tafel)曲线和阻抗谱等考察了该阴极材料及其还原CO2的性能. 结果表明, 该物质为金红石相SnO2, 且掺杂后晶粒减小, Cu2+取代了SnO2晶格中的Sn4+; 当Cu掺杂量为1.5%时材料的催化活性最好. 催化剂负载量为0.8 mg/cm2时, 电流密度可达到3.5 mA/cm2, 产甲酸的塔菲尔曲线斜率为55.1 mV/dec, 最大法拉第效率约为23%, 是纯SnO2的12倍.

关键词: 铜掺杂氧化锡, 电催化, 二氧化碳还原, 低过电位, 甲酸

Abstract:

Cu doped SnO2 was prepared through one-step hydrothermal method with SnCl4·5H2O as precursor material and CuCl2 as dopant. The surface morphology, crystal structure and element composition as well as valence state were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The properties of the material and the reduction of CO2 were investigated by cyclic voltammetry, Tafel plot and electrochemical impedance spectroscopy under normal temperature and pressure in 0.5 mol/L NaHCO3 solution. The results show that SnO2 has rutile structure and Cu2+ ions replace some Sn4+ ions of SnO2. Besides, the particles size decreases slightly after doping Cu+. Through electrochemical performance evaluation, the best catalytic performance was achieved as the Cu doping content was 1.5%. The current density reached 3.5 mA/cm2, the Tafel slope was 55.1 mV/dec and the maximum Faradic efficiency reached 23% when the catalyst loading amount was 0.8 mg. The Faradic efficiency is 12 times that of pure SnO2. Therefore, the Cu doped SnO2 can be used as cathode material for electrocatalytic reduction of CO2.

Key words: Cu doped Sn-oxide, Electrocatalysis, Carbon dioxide reduction, Low overpotential, Formate

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