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A Tri-Metallic (Mn–Co–Ti) Oxide Photoanode with Improved Photo-Conversion Efficiency

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Abstract

In extension to our previous work, studies have been conducted to illustrate the effect of incorporation of Co2O3 on photo-conversion efficiency of Mn2O3–4TiO2 composite thin films. Therefore, the bimetallic crystal [Mn2Ti4(TFA)8(THF)6(OH)4(O)2]⋅0.4THF (1) was mixed with Co(OAc)2 to fabricate Mn2O3–Co2O3–4TiO2 (MCT) thin films via aerosol-assisted chemical vapour deposition (AACVD) method. The thin films were properly characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray (EDX), Atomic Force Microscopy (AFM) and UV-Vis spectroscopy to evaluate their crystalline structure, chemical composition, topography, surface roughness and band gaps. Finally, the films were subjected to record their photo-electrochemical response in terms of Linear Scan Voltammetry (LSV) and Electrochemical Impedance Spectroscopy (EIS) using 0.5 M NaOH electrolyte solution. A photocurrent density of 4.91 mA cm–2 was observed at 0.65 V vs Ag/AgCl/3M KCl with a promising photo conversion efficiency of 2.86%. Furthermore, impedance studies revealed a decrease in charge transfer resistance (Rct) from 123.79 to 56.43 Ω under illumination conditions.

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Funding

Authors acknowledge the Research funding institutes University of Malaya, Research University Grant-Faculty Program, Grant number RF014A-2018 and GPF019A-2019 and Higher Education Commission of Pakistan, Project no. 20-12197/NRPU/RGM/R&D/HEC/2020.

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Authors and Affiliations

  1. Department of Chemistry, School of Natural Sciences, National University of Sciences and Technology (NUST), H-12, Islamabad, Pakistan

    M. A. Mansoor

  2. Advanced Manufacturing and Materials Processing (AMMP) Centre, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia

    M. A. Mansoor, M. N. B. M. Zubir, F. B. Yusof & S. B. Rozali

  3. Faculty of Mechanical Engineering, University Technology MARA, UITM, 40450, Shah Alam, Selangor, Malaysia

    K. Hamzah & N. A. Yahaya

  4. Department of Chemistry, Government College University Lahore, 54000, Lahore, Pakistan

    R. Naeem

  5. Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Z. B. Aspanut

  6. New Energy Science and Engineering Department, University of Xiamen Malaysia, Jalan SunSuria, Bandar SunSuria, 43900, Sepang, Selangor Darul Ehsan, Malaysia

    H. N. Ming

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  1. M. A. Mansoor
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  2. K. Hamzah
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Correspondence to M. A. Mansoor.

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Mansoor, M.A., Hamzah, K., Naeem, R. et al. A Tri-Metallic (Mn–Co–Ti) Oxide Photoanode with Improved Photo-Conversion Efficiency. Russ. J. Inorg. Chem. 66, 806–813 (2021). https://doi.org/10.1134/S0036023621060139

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  • DOI: https://doi.org/10.1134/S0036023621060139

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