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Issue 31, 2018
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Highly efficient photoelectrocatalytic reduction of CO2 on the Ti3C2/g-C3N4 heterojunction with rich Ti3+ and pyri-N species

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Abstract

Photoelectrocatalytic (PEC) reduction of CO2 into chemical fuels in water is a promising route to mitigate the energy crisis and global warming issues. Herein, Ti3C2/g-C3N4 (TCCN) heterojunctions were fabricated by in situ heat treatment and were applied to PEC CO2 reduction. These heterojunctions have narrow band gaps (2.3–2.6 eV) and rich Ti3+ species, which are beneficial to the absorption of solar light and the separation of electrons and holes. Besides this, the abundant pyri-N species in the TCCN heterojunctions can adsorb CO2 molecules, which is favourable for CO2 reduction. The deposition of nanometal particles can accelerate charge transfer. In a two-electrode system of M–TCCN‖BiVO4, the total formation rate of formate and methanol was as high as 50.2 μM cm−2 h−1 (25.1 mM h−1 g−1), which is tenfold that of pristine g-C3N4. The carbon source of the products was verified by a 13CO2 labeling experiment. These heterojunctions show outstanding PEC performance and stability and are promising candidates in the solar-to-fuel engineering field.

Graphical abstract: Highly efficient photoelectrocatalytic reduction of CO2 on the Ti3C2/g-C3N4 heterojunction with rich Ti3+ and pyri-N species

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Supplementary files

Article information


Submitted
11 Apr 2018
Accepted
09 Jul 2018
First published
11 Jul 2018

J. Mater. Chem. A, 2018,6, 15213-15220
Article type
Paper

Highly efficient photoelectrocatalytic reduction of CO2 on the Ti3C2/g-C3N4 heterojunction with rich Ti3+ and pyri-N species

Y. Xu, S. Wang, J. Yang, B. Han, R. Nie, J. Wang, Y. Dong, X. Yu, J. Wang and H. Jing, J. Mater. Chem. A, 2018, 6, 15213
DOI: 10.1039/C8TA03315C

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