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Electrochemical performance of ZnMgO photoanodes prepared by a green synthesis route

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Abstract

Mesoporous ZnMgO nanopowders with varying Mg compositions (0 ≤ x ≤ 0.15) were synthesized via a green synthesis method using Psidium Guajava leaf extract. X-ray diffraction confirms a 10% solubility of Mg in ZnO and a preservation of the wurtzite phase. The 5% Mg doped ZnO sample shows a higher electrochemical performance with an electron lifetime of 35.63 µs and a phase angle of − 2.263° and correlated to the particle size, surface area, and the oxygen vacancy concentration, which is determined both from the phonon correlation length of the E2(high) Raman and the defect emission band measured from photoluminescence spectroscopy.

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Acknowledgments

Gaurav Gupta thanks DST INSPIRE Fellowship for a Senior Research Fellowship (Ref No. DST/AORC-IF/UPGRD/IF170870). Nisha Bala thanks UGC for Senior Research Fellowship (REF. No. 22/06/2014(i)EU-V). Funding from IoE Grant No. Ref. No./IoE/2021/12/FRP is acknowledged. The authors are thankful to CEF, Department of Physics and Astrophysics and USIC, University of Delhi for XRD, TGA and BET facilities. We thank Shikha Verma and Santosh Choudhury for the photoluminescence measurements.

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Authors and Affiliations

  1. Department of Physics and Astrophysics, University of Delhi, New Delhi, Delhi, 110007, India

    Gaurav Gupta & Shyama Rath

  2. Department of Physics, Daulat Ram College, University of Delhi, New Delhi, Delhi, 110007, India

    Nisha Bala

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  1. Gaurav Gupta
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  2. Nisha Bala
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  3. Shyama Rath
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Contributions

GG: Writing—original draft, Conceptualization, Methodology, Investigation, Formal analysis, Writing—review and editing. NB: Investigation, Formal analysis, Writing—review and editing. SR: Supervision, Funding, Conceptualization, Methodology, Investigation, Formal analysis, Writing—review and editing, Supervision.

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Correspondence to Shyama Rath.

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Gupta, G., Bala, N. & Rath, S. Electrochemical performance of ZnMgO photoanodes prepared by a green synthesis route. MRS Communications 13, 1196–1202 (2023). https://doi.org/10.1557/s43579-023-00422-6

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