Promoting photocatalytic CO2 reduction with a molecular copper purpurin chromophore

Huiqing Yuan, Banggui Cheng, Jingxiang Lei, Long Jiang and Zhiji Han ()
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Huiqing Yuan: Sun Yat-sen University
Banggui Cheng: Sun Yat-sen University
Jingxiang Lei: Sun Yat-sen University
Long Jiang: Sun Yat-sen University
Zhiji Han: Sun Yat-sen University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract CO2 reduction through artificial photosynthesis represents a prominent strategy toward the conversion of solar energy into fuels or useful chemical feedstocks. In such configuration, designing highly efficient chromophores comprising earth-abundant elements is essential for both light harvesting and electron transfer. Herein, we report that a copper purpurin complex bearing an additional redox-active center in natural organic chromophores is capable to shift the reduction potential 540 mV more negative than its organic dye component. When this copper photosensitizer is employed with an iron porphyrin as the catalyst and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole as the sacrificial reductant, the system achieves over 16100 turnover number of CO from CO2 with a 95% selectivity (CO vs H2) under visible-light irradiation, which is among the highest reported for a homogeneous noble metal-free system. This work may open up an effective approach for the rational design of highly efficient chromophores in artificial photosynthesis.

Date: 2021
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DOI: 10.1038/s41467-021-21923-9

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