Boosting CO2 Electroreduction on N,P-Co-doped Carbon Aerogels |
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| Authors: | Dr Chunjun Chen Prof Dr Xiaofu Sun Xupeng Yan Yahui Wu Prof Dr Huizhen Liu Dr Qinggong Zhu Bernard Baffour Asare Bediako Prof Dr Buxing Han |
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| Institution: | 1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing, 100190 P. R. China;2. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing, 100190 P. R. China
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Yuquan Road, Shijingshan District, Beijing, 100049 P. R. China |
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| Abstract: | Electroreduction of CO2 to CO powered by renewable electricity is a possible alternative to synthesizing CO from fossil fuel. However, it is very hard to achieve high current density at high faradaic efficiency (FE). Here, the first use of N,P-co-doped carbon aerogels (NPCA) to boost CO2 reduction to CO is presented. The FE of CO could reach 99.1 % with a partial current density of −143.6 mA cm−2, which is one of the highest current densities to date. NPCA has higher electrochemical active area and overall electronic conductivity than that of N- or P-doped carbon aerogels, which favors electron transfer from CO2 to its radical anion or other key intermediates. By control experiments and theoretical calculations, it is found that the pyridinic N was very active for CO2 reduction to CO, and co-doping of P with N hinder the hydrogen evolution reaction (HER) significantly, and thus the both current density and FE are very high. |
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| Keywords: | carbon aerogels carbon dioxide co-doped material electrocatalysis sustainable chemistry |
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