Sarkar, Dipendu and Pramanik, Jishu and Ghosal, Sirsendu and Paul, Swadesh and Giri, K and Datta, Anuja and Sinha, Sudarson Sekhar and Roymahapatra, Gourisankar and Ghosh, Srabanti (2025) Synergic Effect of Atomic-Scale Interface Engineering and Built-in Electric Field at S-Scheme Bi2WO6/ZnIn2S4 Heterojunctions for Photocatalytic Hydrogen Evolution. Small, 21 (33). ISSN 16136829
Full text not available from this repository. (Request a copy)Abstract
The photocatalytic hydrogen evolution reaction (HER) is a promising avenue for sustainable energy conversion, but its efficiency is hindered by rapid charge carrier recombination. In this study, we rationally designed a novel S-scheme heterojunction through the in-situ growth of ZnIn2S4 (ZIS) nanoflakes on assembled Bi2WO6 (BWO) nanorods, forming Bi2WO6/ZnIn2S4 (BWIS) heterostructure with a nanoflake-assembled morphology.Upon visible-light irradiation, the optimized BWIS system exhibited a remarkable photocatalytic HER rate of 392 μmol. g1. h1, representing an enhancement of 24.5-fold compared to pristine BWO, with an Apparent Quantum Yield of 53% at 420 nm. Systematic experimental analyses revealed that well-aligned band structures and work function difference between BWO and ZIS generate a built-in electric field, facilitating directional S-scheme charge transfer from BWO to ZIS. In concert with the optimized interface, this internal field significantly suppresses charge carrier recombination and enhances charge separation and transport kinetics. The formation of interfacial Bi–S bonds facilitate efficient charge transfer pathways, while the presence of metallic Bi (Bi⁰) is an effective electron reservoir, further elevating charge mobility. This work underscores the pivotal role of atomic-scale interface engineering, internal electric field optimization, and defect modulation in advancing S-scheme charge transfer mechanisms, ultimately culminating in superior photocatalytic hydrogen production performance.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Bi2WO6/ZnIn2S4 heterostructures, S-scheme heterojunction, Photocatalytic H2 generation, Interfacial Bi-S bond, Defect states |
| Subjects: | Engineering Materials |
| Divisions: | Fuel Cell and Battery |
| Depositing User: | Ms Upasana Sahu |
| Date Deposited: | 01 Sep 2025 11:29 |
| Last Modified: | 01 Sep 2025 11:29 |
| URI: | http://cgcri.csircentral.net/id/eprint/5757 |
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