A Hybrid Co Quaterpyridine Complex/Carbon Nanotube Catalytic Material for CO2 Reduction in Water |
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| Authors: | Min Wang Dr Lingjing Chen Prof?Dr Tai‐Chu Lau Prof?Dr Marc Robert |
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| Institution: | 1. Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS no. 7591, Batiment Lavoisier, Paris Cedex 13, France;2. School of Environment and Civil Engineering, Dongguan University of Technology, Guangdong, P. R. China;3. Department of Chemistry and Institute of Molecular Functional Materials, City University of Hong Kong, Kowloon, Hong Kong, P. R. China |
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| Abstract: | Associating a metal‐based catalyst to a carbon‐based nanomaterial is a promising approach for the production of solar fuels from CO2. Upon appending a CoII quaterpyridine complex Co(qpy)]2+ at the surface of multi‐walled carbon nanotubes, CO2 conversion into CO was realized in water at pH 7.3 with 100 % catalytic selectivity and 100 % Faradaic efficiency, at low catalyst loading and reduced overpotential. A current density of 0.94 mA cm?2 was reached at ?0.35 V vs. RHE (240 mV overpotential), and 9.3 mA cm?2 could be sustained for hours at only 340 mV overpotential with excellent catalyst stability (89 095 catalytic cycles in 4.5 h), while 19.9 mA cm?2 was met at 440 mV overpotential. Such a hybrid material combines the high selectivity of a homogeneous molecular catalyst to the robustness of a heterogeneous material. Catalytic performances compare well with those of noble‐metal‐based nano‐electrocatalysts and atomically dispersed metal atoms in carbon matrices. |
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| Keywords: | carbon dioxide reduction cobalt complexes electrochemical catalysis hybrid materials supported homogeneous catalysis |
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