Pt@WS<sub>2</sub> Mott-Schottky Heterojunction Boosts Light-Driven Active Ion Transport for Enhanced Ionic Power Harvesting.
basic_science · Level V
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- Record sourced from PubMed, PMID 39680712.
- Also identified by DOI 10.1021/acsnano.4c15723.
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Abstract
Bioinspired light-driven ion transport in two-dimensional (2D) nanofluidics offers exciting prospects for solar energy harvesting. Current single-component nanofluidic membranes often suffer from low light-induced driving forces due to the easy recombination of photogenerated electron-hole pairs. Herein, we present a Pt@WS<sub>2</sub> Mott-Schottky heterojunction-based 2D nanofluidic membrane for boosting light-driven active ion transport and solar enhanced ionic power harvesting. The photovoltaic effect in the Mott-Schottky heterojunctions and photoconductance effect in WS<sub>2</sub> multilayers account for more efficient charge separation across the nanofluidic membrane. In an equilibrium electrolyte solution, we observe directional cationic transport from the WS<sub>2</sub> to the Pt region under visible-light illumination. In 10<sup>-3</sup> M KCl electrolyte, the photocurrent and photovoltage reach 11.84 μA cm<sup>-2</sup> and 30.67 mV, respectively. Moreover, the output power can reach up to 5.02 W m<sup>-2</sup> under light illumination, compared to a value of 2.56 W m<sup>-2</sup> without irradiation. This work not only introduces a driving mechanism for boosting ion transport but also offers a pathway for integrating multiple energy sources.