Issue 25, 2022

Cupric porphyrin frameworks on multi-junction silicon photocathodes to expedite the kinetics of CO2 turnover

Abstract

Photoelectrochemical CO2 reduction utilizing silicon-based photocathodes offers a promising route to directly store solar energy in chemical bonds, provoking the development of heterogeneous molecular catalysts with high turnover rates. Herein, an in situ surface transformation strategy is adopted to grow metal–organic frameworks (MOFs) on Si-based photocathodes, serving as catalytic scaffolds for boosting both the kinetics and selectivity of CO2 reduction. Benefitting from the multi-junctional configuration for enhanced charge separation and the porous MOF scaffold enriching redox-active metalloporphyrin sites, the Si photocathode demonstrates a high CO faradaic efficiency of 87% at a photocurrent density of 10.2 mA cm−2, which is among the best seen for heterogeneous molecular catalysts. This study highlights the exploitation of reticular chemistry and macrocycle complexes as Earth-abundant alternatives for catalyzing artificial photosynthesis.

Graphical abstract: Cupric porphyrin frameworks on multi-junction silicon photocathodes to expedite the kinetics of CO2 turnover

Supplementary files

Article information

Article type
Communication
Submitted
07 Agd 2022
Accepted
31 Cax 2022
First published
01 Qas 2022

Nanoscale, 2022,14, 8906-8913

Cupric porphyrin frameworks on multi-junction silicon photocathodes to expedite the kinetics of CO2 turnover

Z. Wei, Q. Mu, R. Fan, Y. Su, Y. Lu, Z. Deng, M. Shen and Y. Peng, Nanoscale, 2022, 14, 8906 DOI: 10.1039/D2NR01921C

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