Self-activated superhydrophilic green ZnIn2S4 realizing solar-driven overall water splitting: close-to-unity stability for a full daytime

Wei-Kean Chong, Boon-Junn Ng, Yong Jieh Lee, Lling-Lling Tan, Lutfi Kurnianditia Putri, Jingxiang Low, Abdul Rahman Mohamed and Siang-Piao Chai ()
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Wei-Kean Chong: Monash University Malaysia, Jalan Lagoon Selatan
Boon-Junn Ng: Monash University Malaysia, Jalan Lagoon Selatan
Yong Jieh Lee: Monash University Malaysia, Jalan Lagoon Selatan
Lling-Lling Tan: Monash University Malaysia, Jalan Lagoon Selatan
Lutfi Kurnianditia Putri: Monash University Malaysia, Jalan Lagoon Selatan
Jingxiang Low: Monash University Malaysia, Jalan Lagoon Selatan
Abdul Rahman Mohamed: Universiti Sains Malaysia
Siang-Piao Chai: Monash University Malaysia, Jalan Lagoon Selatan

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Engineering an efficient semiconductor to sustainably produce green hydrogen via solar-driven water splitting is one of the cutting-edge strategies for carbon-neutral energy ecosystem. Herein, a superhydrophilic green hollow ZnIn2S4 (gZIS) was fabricated to realize unassisted photocatalytic overall water splitting. The hollow hierarchical framework benefits exposure of intrinsically active facets and activates inert basal planes. The superhydrophilic nature of gZIS promotes intense surface water molecule interactions. The presence of vacancies within gZIS facilitates photon energy utilization and charge transfer. Systematic theoretical computations signify the defect-induced charge redistribution of gZIS enhancing water activation and reducing surface kinetic barriers. Ultimately, the gZIS could drive photocatalytic pure water splitting by retaining close-to-unity stability for a full daytime reaction with performance comparable to other complex sulfide-based materials. This work reports a self-activated, single-component cocatalyst-free gZIS with great exploration value, potentially providing a state-of-the-art design and innovative aperture for efficient solar-driven hydrogen production to achieve carbon-neutrality.

Date: 2023
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DOI: 10.1038/s41467-023-43331-x

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