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Enhanced yield of methanol using rGO-Bi2S3/CuO heterojunction photocatalyst for CO2 reduction

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Abstract

A visible light-induced rGO-Bi2S3/CuO S-scheme heterojunction photocatalyst is explored for the production of methanol and formic acid through photocatalytic CO2 reduction. In this work, the effect of CuO loading on rGO-Bi2S3 nano-hollow flower composite are investigated to improve the yield and selectivity of methanol production. The synthesised rGO-Bi2S3/CuO nanocomposite, being a highly efficient and robust photocatalyst, exhibits the maximum methanol yield of 423.52 μmol gcat.−1 h−1 along with formic acid. CuO loading on rGO-Bi2S3 is responsible for achieving the maximum photocatalytic activity of the rGO-Bi2S3/CuO photocatalyst, the narrowest band gap, the lowest recombination rate of electron–hole pairs, and the increased specific surface area for CO2 capture among all the related photocatalysts, rGO-Bi2S3, pristine Bi2S3, and Bi2S3/CuO nanocomposite. The selectivity of methanol is improved to 98.6% by the rGO-Bi2S3/CuO heterojunction photocatalyst. The absorption edge (652.4 nm) of the rGO-Bi2S3/CuO photocatalyst clearly exhibits outstanding visible light absorption and enhanced photo carrier transportation power.

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Acknowledgments

The authors gratefully acknowledge Jadavpur University, CRNN-University of Calcutta, Bose Institute, IIT Kharagpur and IIT Delhi for characterization.

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  1. Department of Chemical Engineering, Jadavpur University, Kolkata, India

    Arindam Mandal & Kajari Kargupta

  2. Department of Chemical Engineering, University of Calcutta, Kolkata, India

    Guruprasad Bhattacharya

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Mandal, A., Bhattacharya, G. & Kargupta, K. Enhanced yield of methanol using rGO-Bi2S3/CuO heterojunction photocatalyst for CO2 reduction. Journal of Materials Research (2024). https://doi.org/10.1557/s43578-024-01352-2

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