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<p>Tailoring the electronic band structure through strategic cation or anion incorporation in metal oxide semiconductors is a promising approach to enhance interfacial charge transfer, thereby improving the photoelectrochemical (PEC) performance. In this study, molybdenum-doped bismuth tungstate nanoplates with the general formula Bi<sub>2</sub>Mo<sub>x</sub>W<sub>1−x</sub>O<sub>6</sub> (0 ≤ x ≤ 1) were successfully synthesized via a one-pot solvothermal method. A comprehensive suite of characterization techniques was employed to probe the structural, morphological, optical, elemental, and textural features of the as-prepared materials. X-ray photoelectron spectroscopy (XPS) confirmed the successful substitution of Mo<sup>6+</sup> ions into the Bi<sub>2</sub>WO<sub>6</sub> crystal lattice. The photoelectrochemical performance of the material was evaluated by fabricating photoanodes through drop-casting the nanopowders onto FTO substrates. Among all compositions, Bi<sub>2</sub>Mo<sub>0.75</sub>W<sub>0.25</sub>O<sub>6</sub> demonstrated superior PEC activity, exhibiting the lowest onset potentials (η<sub>dark</sub> = 0.79&#xa0;V, η<sub>light</sub> = 0.40&#xa0;V vs. Ag/AgCl) for the oxygen evolution reaction (OER). This sample also displayed the highest photocurrent density, most favourable flat band potential, and well-aligned band edge positions, all of which contribute to an efficient charge separation and transport. These findings underscore the effectiveness of Mo substitution in modulating the band structure and enhancing the PEC water oxidation performance of Bi<sub>2</sub>WO<sub>6</sub>-based photoanodes.</p> Graphical abstract <p></p>

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Cationic substitution-induced charge dynamics in Bi2MoxW1−xO6 for efficient solar driven photoelectrochemical water splitting

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • D. Trixy Nimmy Priscilla,
  • R. Radha,
  • M. Prabhaharan,
  • S. K. Geetha

摘要

Tailoring the electronic band structure through strategic cation or anion incorporation in metal oxide semiconductors is a promising approach to enhance interfacial charge transfer, thereby improving the photoelectrochemical (PEC) performance. In this study, molybdenum-doped bismuth tungstate nanoplates with the general formula Bi2MoxW1−xO6 (0 ≤ x ≤ 1) were successfully synthesized via a one-pot solvothermal method. A comprehensive suite of characterization techniques was employed to probe the structural, morphological, optical, elemental, and textural features of the as-prepared materials. X-ray photoelectron spectroscopy (XPS) confirmed the successful substitution of Mo6+ ions into the Bi2WO6 crystal lattice. The photoelectrochemical performance of the material was evaluated by fabricating photoanodes through drop-casting the nanopowders onto FTO substrates. Among all compositions, Bi2Mo0.75W0.25O6 demonstrated superior PEC activity, exhibiting the lowest onset potentials (ηdark = 0.79 V, ηlight = 0.40 V vs. Ag/AgCl) for the oxygen evolution reaction (OER). This sample also displayed the highest photocurrent density, most favourable flat band potential, and well-aligned band edge positions, all of which contribute to an efficient charge separation and transport. These findings underscore the effectiveness of Mo substitution in modulating the band structure and enhancing the PEC water oxidation performance of Bi2WO6-based photoanodes.

Graphical abstract