Porous metal-porphyrin triazine-based frameworks for efficient CO2 electroreduction

• Published in: Applied catalysis. B, Environmental Environmental, 2020-08, Vol.270, p.118908, Article 118908
• Main Authors: Feng, Shaohua, Zheng, Wanzhen, Zhu, Jingke, Li, Zhongjian, Yang, Bin, Wen, Zhenhai, Lu, Jianguo, Lei, Lecheng, Wang, Shaobin, Hou, Yang
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Chemical reduction; CO Production; CO2 reduction reaction; Copper; Electrocatalysis; Electrochemistry; Intermediates; Iron; Manganese; Metals; Nickel; Porous metal-porphyrin triazine-based frameworks; Protonation; Reaction mechanisms; Transition metals; Triazine
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2020.118908

[Display omitted] •A family of porous metal-porphyrin triazine-based frameworks (MPTFs) were developed.•NiPTFs-600 exhibited a superb activity of electrocatalytic reduction of CO2 (ECR-CO2).•The superb ECR-CO2 was attributed to abundant N species and Ni-Nx active sites. Electrochemical reduction of CO2 (ECR-CO2) into high value-added products plays a crucial role in energy conversions. Herein, we developed a family of porous metal-porphyrin triazine-based frameworks (MPTFs-x, M = Mn, Fe, Co, Ni, and Cu, x = temperature) with a specific surface area up to 977 m2 g−1 and homogenously dispersed transition-metals. Benefiting from a high content of N species of 8.43 at.% and abundantly exposed Ni-Nx active sites, NiPTFs-600 displayed a superb Faradaic efficiency (FE) of CO production (>90 %) in the range of −0.55 V to −0.95 V with the maximum FE of 97.6 % and current density of 10.8 mA cm-2 at −0.8 V. The reaction mechanism was found to be the adsorption of CO2 molecules to form *CO2 intermediates, accompanied by successive protonation to produce *COOH and then *CO.