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

Abstract

The photoelectrocatalytic (PEC) reduction of CO2 into chemical fuels in water is conceived as a promising route to mitigate energy crisis and global warming issues. Herein, Ti3C2/g-C3N4 (TCCN) heterojunctions were fabricated by in-situ heating treatment and applied to PEC CO2reduction. 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, the abundant pyri-N species in TCCN heterojunctions could adsorbe CO2 molecules, which is favourable for the CO2 reduction. The deposition of nanometal particles would accelerate the charge transfer obviously. In the two-electrode system of M-TCCN||BiVO4, the total formation rate of formate and methanol can be as high as 50.2 μMcm-2h-1 (25.1 mMh-1g-1) that is tenfold than that of pristine g-C3N4. The carbon source of products was verified by 13CO2 labeling experiment. These heterojunctions show outstanding PEC performance and stability, which can be used as promising candidates in solar-to-fuel engineering field.

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Publication details

The article was received on 11 Apr 2018, accepted on 09 Jul 2018 and first published on 11 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA03315C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    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, Accepted Manuscript , DOI: 10.1039/C8TA03315C

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