Photocathode functionalized with a molecular cobalt catalyst for selective carbon dioxide reduction in water

Palas Baran Pati, Ruwen Wang, Etienne Boutin, Stéphane Diring, Stéphane Jobic, Nicolas Barreau (), Fabrice Odobel () and Marc Robert ()
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Palas Baran Pati: Université de Nantes, CNRS, CEISAM UMR 6230
Ruwen Wang: Université de Paris, Laboratoire d’Electrochimie Moléculaire, CNRS
Etienne Boutin: Université de Paris, Laboratoire d’Electrochimie Moléculaire, CNRS
Stéphane Diring: Université de Nantes, CNRS, CEISAM UMR 6230
Stéphane Jobic: Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN
Nicolas Barreau: Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN
Fabrice Odobel: Université de Nantes, CNRS, CEISAM UMR 6230
Marc Robert: Université de Paris, Laboratoire d’Electrochimie Moléculaire, CNRS

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Artificial photosynthesis is a vibrant field of research aiming at converting abundant, low energy molecules such as water, nitrogen or carbon dioxide into fuels or useful chemicals by means of solar energy input. Photo-electrochemical reduction of carbon dioxide is an appealing strategy, aiming at reducing the greenhouse gas into valuable products such as carbon monoxide at low or without bias voltage. Yet, in such configuration, there is no catalytic system able to produce carbon monoxide selectively in aqueous media with high activity, and using earth-abundant molecular catalyst. Upon associating a p-type Cu(In,Ga)Se2 semi-conductor with cobalt quaterpyridine complex, we herein report a photocathode complying with the aforementioned requirements. Pure carbon dioxide dissolved in aqueous solution (pH 6.8) is converted to carbon monoxide under visible light illumination with partial current density above 3 mA cm−2 and 97% selectivity, showing good stability over time.

Date: 2020
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DOI: 10.1038/s41467-020-17125-4

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