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Covalently Grafting Cobalt Porphyrin onto Carbon Nanotubes for Efficient CO 2 Electroreduction
Author(s) -
Zhu Minghui,
Chen Jiacheng,
Huang Libei,
Ye Ruquan,
Xu Jing,
Han YiFan
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201900499
Subject(s) - overpotential , cobalt , porphyrin , carbon nanotube , electrochemistry , catalysis , covalent bond , electrocatalyst , faraday efficiency , materials science , transition metal , selectivity , chemical engineering , carbon fibers , chemistry , nanotechnology , inorganic chemistry , photochemistry , electrode , organic chemistry , composite material , composite number , engineering
Molecular complexes with inexpensive transition‐metal centers have drawn extensive attention, as they show a high selectivity in the electrochemical conversion of CO 2 to CO. In this work, we propose a new strategy to covalently graft cobalt porphyrin onto the surface of a carbon nanotube by a substitution reaction at the metal center. Material characterization and electrochemical studies reveal that the porphyrin molecules are well dispersed at a high loading of 10 wt. %. As a result, the turnover frequency for CO formation is improved by a factor of three compared to traditional physically‐mixed catalysts with the same cobalt content. This leads to an outstanding overall current density of 25.1 mA cm −2 and a Faradaic efficiency of 98.3 % at 490 mV overpotential with excellent long‐term stability. This work provides an effective pathway for the improvement of the performance of electrocatalysts that could inspire rational design of molecular catalysts in the future.