Constructing Sulfur Vacancy-Rich NiCo<sub>2</sub>S<sub>4</sub>@MoS<sub>2</sub> Core@shell Heterostructure via Interface Engineering for Enhanced HER Electrocatalysis
The rational design of heterointerfaces with optimized charge dynamics and defect engineering remains pivotal for developing advanced non-noble metal-based electrocatalysts for water splitting. A comparative study of NiCo<sub>2</sub>S<sub>4</sub>–MoS<sub>2</sub> h...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/14/1061 |
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| Summary: | The rational design of heterointerfaces with optimized charge dynamics and defect engineering remains pivotal for developing advanced non-noble metal-based electrocatalysts for water splitting. A comparative study of NiCo<sub>2</sub>S<sub>4</sub>–MoS<sub>2</sub> heterostructures was conducted to elucidate the impact of interfacial architecture and defect engineering on hydrogen evolution reaction (HER) performance. A core@shell NiCo<sub>2</sub>S<sub>4</sub>@MoS<sub>2</sub> heterostructure was synthesized via a facile hydrothermal growth method, inducing lattice distortion and strong interfacial coupling, while supported NiCo<sub>2</sub>S<sub>4</sub>/MoS<sub>2</sub> heterostructures were prepared by ultrasonic-assisted deposition. A detailed structural and spectroscopic characterization and theoretical calculation demonstrated that the core@shell configuration promotes charge redistribution across the NiCo<sub>2</sub>S<sub>4</sub>–MoS<sub>2</sub> interface and generates abundant sulfur vacancies, thereby increasing the density of electroactive sites. Electrochemical measurements reveal that NiCo<sub>2</sub>S<sub>4</sub>@MoS<sub>2</sub> markedly outperforms the supported heterostructure, single-component NiCo<sub>2</sub>S<sub>4</sub>, and MoS<sub>2</sub> when serving as the HER catalyst in acid solution. These findings establish a dual-optimization strategy—combining interfacial design with vacancy modulation—that provides a generalizable paradigm for the deliberate design of high-efficiency non-noble metal-based electrocatalysts for water splitting reactions. |
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| ISSN: | 2079-4991 |