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Biomass-based carbon aerogels with interconnected pores and controllable Zn–N sites for CO2 electroreduction

Author

Listed:
  • Zhang, Junjie
  • Zheng, Huanhuan
  • Zhang, Shibiao
  • Zhang, Xiong
  • Shao, Jingai
  • Zhang, Shihong
  • Yang, Haiping
  • Chen, Hanping

Abstract

The rational design of renewable, highly active, and selective catalysts has always been the key to the practical application of CO2 electroreduction. In this study, biomass-based Zn/N doped carbon aerogels were fabricated for high-selectivity electrical reduction of CO2 to CO. After in situ Zn/N doping, carbon aerogels exhibited interconnected pores, high surface area, and exposed active sites, and their physicochemical properties are significantly affected by pyrolysis temperature. When the pyrolysis temperature increased to 950 °C, the number of surface active sites and pore structure parameters of carbon aerogels decreased significantly due to the escape of zinc and nitrogen. CAZN-850 exhibited the highest specific surface area of 1317.0 m2/g and abundant Zn–N sites, which results in its high activity and selectivity for electroreduction of CO2 to CO (FECO = 89 % at −1.0V vs. RHE). Moreover, the stability test results for CO2RR showed that the reduction value of FECO for Zn/N doped carbon aerogels was only 5 % under long-time operation. This work provides a new idea for the design of biomass-based catalysts for CO2 electroreduction.

Suggested Citation

  • Zhang, Junjie & Zheng, Huanhuan & Zhang, Shibiao & Zhang, Xiong & Shao, Jingai & Zhang, Shihong & Yang, Haiping & Chen, Hanping, 2024. "Biomass-based carbon aerogels with interconnected pores and controllable Zn–N sites for CO2 electroreduction," Energy, Elsevier, vol. 298(C).
    • Handle: RePEc:eee:energy:v:298:y:2024:i:c:s0360544224011629
    DOI: 10.1016/j.energy.2024.131389
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