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Ammonia etched petroleum pitch-based porous carbon as efficient catalysts for CO2 electroreduction

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2022, 32(3), pp.807-814
  • DOI : 10.1007/s42823-021-00316-4
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : October 12, 2021
  • Accepted : December 15, 2021
  • Published : May 1, 2022

Ning Hui 1 Guo Zhihao 1 Wang Wenhang 1 Wang Xiaoshan 1 Yang Zhongxue 1 Ma Zhengguang 1 Tian Yangming 1 Wu Chenghao 1 Hao Jian 2 Wu Mingbo 1

1China University of Petroleum (East China)
2Ningxia University

Accredited

ABSTRACT

Electrochemical reduction of carbon dioxide to valuable chemicals is a promising way of storing renewable energy through electric-to-chemical energy conversion, while its large-scale application is in urgent need of cheap and high-performance catalysts. Herein, we invent a convenient method to synthesize N-doped porous carbon by ammonia etching the pyrolysis carbon of petroleum pitch. We found the ammonia etching treatment not only increase the pyridinic-N content, but also enlarge the specific surface area of the petroleum pitch-based porous carbon. As a cheap and easily available catalyst for carbon dioxide electroreduction, up to 82% of Faradaic efficiency towards carbon monoxide was obtained at − 0.9 V vs the reversible hydrogen electrode in 0.1 M KHCO3. After a long time electrocatalysis of more than 20 h, the Faradaic efficiency of carbon monoxide remains 80%, indicating the porous carbon as made have an ultra-high stability as catalyst for carbon dioxide reduction. Our work provides a new technology to economically prepare efficient electrocatalysts for carbon dioxide reduction.

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