Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (7): 1697-1702.DOI: 10.1016/S1872-2067(21)64006-8

• Special column on catalytic conversion of CO2 Previous Articles     Next Articles

Synergetic effect of nitrogen-doped carbon catalysts for high-efficiency electrochemical CO2 reduction

Chuhao Liua,, Yue Wua,, Jinjie Fangc, Ke Yua, Hui Lia, Wenjun Heb, Weng-Chon Cheongd, Shoujie Liua, Zheng Chene, Jing Dongb,*(), Chen Chena,#()   

  1. aDepartment of Chemistry, Tsinghua University, Beijing 100084, China
    bScientific Research Department, Nanjing Tech University, Nanjing 211816, Jiangsu, China
    cBeijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    dDepartment of Physics and Chemistry, Faculty of Science and Technology, University of Macau, Macau, China
    eKey Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Normal University, Wuhu 241000, Anhui, China
  • Received:2021-09-21 Accepted:2021-11-12 Online:2022-07-18 Published:2022-05-20
  • Contact: Jing Dong, Chen Chen
  • About author:First author contact:

    Contributed equally to this work.

  • Supported by:
    National Key R&D Program of China(2016YFA0202801);National Natural Science Foundation of China(21925202);National Natural Science Foundation of China(21872076);Beijing Natural Science Foundation(JQ18007);Tsinghua University Initiative Scientific Research Program

Abstract:

The use of carbon-based materials is an appealing strategy to solve the issue of excessive CO2 emissions. In particular, metal-free nitrogen-doped carbon materials (mf-NCs) have the advantages of convenient synthesis, cost-effectiveness, and high conductivity and are ideal electrocatalysts for the CO2 reduction reaction (CO2RR). However, the unclear identification of the active N sites and the low intrinsic activity of mf-NCs hinder the further development of high-performance CO2RR electrocatalysts. Achieving precise control over the synthesis of mf-NC catalysts with well-defined active N-species sites is still challenging. To this end, we adopted a facile synthesis method to construct a set of mf-NCs as robust catalysts for CO2RR. The resulting best-performing catalyst obtained a Faradaic efficiency of CO of approximately 90% at -0.55 V (vs. reversible hydrogen electrode) and good stability. The electrocatalytic performance and in situ attenuated total reflectance surface-enhanced infrared absorption spectroscopy measurements collectively revealed that graphitic and pyridinic N can synergistically adsorb CO2 and H2O and thus promote CO2 activation and protonation.

Key words: CO2 reduction reaction, Nitrogen-doped carbon material, Pyridinic N, Graphitic N, Synergetic effect