高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (7): 20220317.doi: 10.7503/cjcu20220317

• 研究论文 • 上一篇    下一篇

调节氧化镉-炭黑界面高效电催化CO2还原生成CO

王丽君,李欣,洪崧,詹新雨,王迪,郝磊端,孙振宇   

  1. 北京化工大学化学工程学院, 有机-无机复合材料国家重点实验室, 北京 100029
  • 收稿日期:2022-05-09 出版日期:2022-07-10 发布日期:2022-06-09
  • 作者简介:郝磊端, 女, 博士, 副教授, 主要从事CO2的热和电催化研究. E-mail: haold@buct.edu.cn
  • 基金资助:
    国家自然科学基金(21972010);北京市自然科学基金(2192039)

Efficient Electrocatalytic CO2 Reduction to CO by Tuning CdO-Carbon Black Interface

WANG Lijun, LI Xin, HONG Song, ZHAN Xinyu, WANG Di, HAO Leiduan(), SUN Zhenyu()   

  1. State Key Laboratory of Organic-Inorganic Composites,College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China
  • Received:2022-05-09 Online:2022-07-10 Published:2022-06-09
  • Contact: SUN Zhenyu E-mail:haold@buct.edu.cn;sunzy@mail.buct.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21972010);the Natural Science Foundation of Beijing, China(2192039)

摘要:

通过调节氧化镉与炭黑之间的界面实现了高效电化学二氧化碳还原. 不同氧化镉和炭黑含量的 CdO/CB复合材料利用超声处理方法制备. 采用X射线衍射、 X射线光电子能谱和透射电子显微镜对所得复合材料进行表征, 揭示了其结构组成和形貌. 用H型电解池对CdO/CB复合材料电催化二氧化碳还原的性能进行测试发现, CdO质量分数为20%的CdO/CB 可在-1.0 V(vs. RHE)电位下获得高达92.7%的总法拉第效率, 而纯CdO在相同条件下的法拉第效率仅为69.5%. CO的法拉第效率最高可达87.4%. 进一步的对比实验和动力学研究结果表明, CdO/CB具有更高的电催化CO2还原性能源于复合材料中氧化镉与炭黑之间的界面和高接触面积. 此外, CdO/CB可在至少10 h的二氧化碳电还原反应中保持稳定的CO法拉第效率.

关键词: 电化学二氧化碳还原, 一氧化碳, 氧化镉, 炭黑, 电催化

Abstract:

Highly efficient electrochemical CO2 reduction(ECR) was realized by tuning the interface between CdO and carbon black(CB). CdO/CB composites with different amounts of CdO and CB were prepared simply through ultrasonication. The obtained CdO/CB was characterized by a series of techniques including XRD, XPS, and TEM to reveal its composition and morphology. The ECR performance of CdO/CB composites was tested in an H-type cell. An overall ECR faradaic efficiency(FE) as high as 92.7% was achieved at -1.0 V(versus reversible hydrogen electrode) over CdO/CB with 20%(mass fraction) of CdO, in stark contrast to 69.5% over bare CdO. The highest CO FE reached 87.4%. Further control experiments and kinetic studies suggested that the enhanced catalytic activity of CdO/CB was attributed to the large contact area and interface between CdO and CB. In addition, CdO/CB exhibited stable CO FE for at least 10 h of ECR reaction. The easily accessible CdO/CB composites with tunable interface provide a feasible avenue for efficient ECR over economic electrocatalysts.

Key words: Electrochemical carbon dioxide reduction, Carbon monoxide, Cadmium oxide, Carbon black, Electrocatalysis

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