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Highly Efficient Porous Carbon Electrocatalyst with Controllable N-Species Content for Selective CO2 Reduction |
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| Authors: | Lin Ye Yiran Ying Dr Dengrong Sun Zhouyang Zhang Prof Linfeng Fei Prof Zhenhai Wen Prof Jinli Qiao Prof Haitao Huang |
| Institution: | 1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;2. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Nam-gu, Pohang-Si, Gyungsangbuk-do, 37673 South Korea;3. School of Materials Science and Engineering, Nanchang University, Nanchang, Jiangxi, 330031 China;4. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
School of Materials Science and Engineering, Nanchang University, Nanchang, Jiangxi, 330031 China;5. Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China;6. College of Environmental Science and Engineering, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620 China |
| Abstract: | We report a straightforward strategy to design efficient N doped porous carbon (NPC) electrocatalyst that has a high concentration of easily accessible active sites for the CO2 reduction reaction (CO2RR). The NPC with large amounts of active N (pyridinic and graphitic N) and highly porous structure is prepared by using an oxygen-rich metal–organic framework (Zn-MOF-74) precursor. The amount of active N species can be tuned by optimizing the calcination temperature and time. Owing to the large pore sizes, the active sites are well exposed to electrolyte for CO2RR. The NPC exhibits superior CO2RR activity with a small onset potential of −0.35 V and a high faradaic efficiency (FE) of 98.4 % towards CO at −0.55 V vs. RHE, one of the highest values among NPC-based CO2RR electrocatalysts. This work advances an effective and facile way towards highly active and cost-effective alternatives to noble-metal CO2RR electrocatalysts for practical applications. |
| Keywords: | CO2-Reduktion Elektrokatalyse Hierarchisch poröse Materialien Metall-organische Gerüste (MOFs) Stickstoff-dotierter Kohlenstoff |