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<p>This study explores the photoelectrochemical (PEC) properties of lead-free Cs<sub>2</sub>AgBiI<sub>6</sub> double perovskite nanocrystals synthesized via the hot-injection method, focusing on the impact of quenching time. The nanocrystals exhibit an optical band gap of ∼&#xa0;1.88–2.06&#xa0;eV, suitable for visible-light applications. A thin film with a 30-min quenching time achieved optimal PEC performance, with a high photocurrent density (∼&#xa0;47.01&#xa0;μA/cm<sup>2</sup>) and low Tafel slope (∼&#xa0;30.66&#xa0;V/decade), indicating efficient catalysis. Mott–Schottky analysis showed a positive flat-band potential shift, a high charge-carrier density (∼&#xa0;8.05 × 10<sup>17</sup>&#xa0;cm<sup>−3</sup>), and a narrow depletion width (∼&#xa0;2.29&#xa0;nm), supporting enhanced charge separation. Electrochemical impedance spectroscopy revealed improved interfacial charge dynamics. These findings demonstrate that controlling quenching time is key to maximizing the electronic and structural properties of Cs<sub>2</sub>AgBiI<sub>6</sub> nanocrystals, making them promising, stable, and eco-friendly photoanodes for sustainable hydrogen production.</p> Graphical abstract <p></p>

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Enhanced photoelectrochemical water splitting performance of Cs2AgBiI6 halide double perovskite nanocrystals via controlled quenching reaction time

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Ashvini Punde,
  • Shruti Shah,
  • Yogesh Hase,
  • Ashish Waghmare,
  • Somnath Ladhane,
  • Swati Rahane,
  • Jyoti Thombare,
  • Mansi Ingole,
  • Priti Vairale,
  • Azam Mayabadi,
  • Shashikant P. Patole,
  • Sandesh Jadkar

摘要

This study explores the photoelectrochemical (PEC) properties of lead-free Cs2AgBiI6 double perovskite nanocrystals synthesized via the hot-injection method, focusing on the impact of quenching time. The nanocrystals exhibit an optical band gap of ∼ 1.88–2.06 eV, suitable for visible-light applications. A thin film with a 30-min quenching time achieved optimal PEC performance, with a high photocurrent density (∼ 47.01 μA/cm2) and low Tafel slope (∼ 30.66 V/decade), indicating efficient catalysis. Mott–Schottky analysis showed a positive flat-band potential shift, a high charge-carrier density (∼ 8.05 × 1017 cm−3), and a narrow depletion width (∼ 2.29 nm), supporting enhanced charge separation. Electrochemical impedance spectroscopy revealed improved interfacial charge dynamics. These findings demonstrate that controlling quenching time is key to maximizing the electronic and structural properties of Cs2AgBiI6 nanocrystals, making them promising, stable, and eco-friendly photoanodes for sustainable hydrogen production.

Graphical abstract