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<p>Efficient overall water splitting (OWS) technology has been highly demanded across the world, of which the key is the development of active and stable electrocatalysts for both hydrogen and oxygen evolution reactions (HER/OER). Herein, novel crystalline Ni<sub>3</sub>S<sub>2</sub> nanorods tuned by low-crystalline NiCoS<sub><i>x</i></sub> (NiCoS<sub><i>x</i></sub>@Ni<sub>3</sub>S<sub>2</sub>) are synthesized via an ion-exchange strategy. The built-in electric field at the heterogeneous interface driven by work function difference, facilitates rapid electron transfer from Ni<sub>3</sub>S<sub>2</sub> to NiCoS<sub><i>x</i></sub> via a robust Ni–S–Co bond bridge. This synergistic combination of the conductive crystalline core and low-crystalline shell optimizes the d-band center, balancing intermediate adsorption/desorption, speeding up water dissociation, enhancing hydrogen adsorption/desorption for HER, and lowering the energy barrier for OER, ultimately boosting OWS efficiency. The defect-rich, low-crystalline NiCoS<i>x</i> shell, bonded to the crystalline core via Ni–S–Co bonds, serves as a protective armor, enabling dynamic reconstruction into NiCoOOH and suppresses sulfide leaching, ensuring catalytic stability. The optimized NiCoS<sub><i>x</i></sub>@Ni<sub>3</sub>S<sub>2</sub> achieves low HER/OER overpotentials of 346/520&#xa0;mV@1000&#xa0;mA&#xa0;cm<sup>−2</sup>, evidenced by an ultralow cell voltage of 2.10&#xa0;V@1000&#xa0;mA&#xa0;cm<sup>−2</sup> for OWS and long-term durability up to 400&#xa0;h. The work paves a novel way to fabricate sulfur-based electrocatalysts with high yet balanced activity and stability for OWS via an interface engineering strategy.</p>

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Crystalline Ni3S2 Nanorods Tuned by Low-Crystalline NiCoSx with Built-In Electric Field for Efficient Overall Water Splitting

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月26日

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  • Neng Chen,
  • Jun He,
  • Hongqiang Li,
  • Dedong Jia,
  • Haoran Qian,
  • Huan Pang,
  • Jieshan Qiu,
  • Yongfeng Li,
  • Xiaojun He

摘要

Efficient overall water splitting (OWS) technology has been highly demanded across the world, of which the key is the development of active and stable electrocatalysts for both hydrogen and oxygen evolution reactions (HER/OER). Herein, novel crystalline Ni3S2 nanorods tuned by low-crystalline NiCoSx (NiCoSx@Ni3S2) are synthesized via an ion-exchange strategy. The built-in electric field at the heterogeneous interface driven by work function difference, facilitates rapid electron transfer from Ni3S2 to NiCoSx via a robust Ni–S–Co bond bridge. This synergistic combination of the conductive crystalline core and low-crystalline shell optimizes the d-band center, balancing intermediate adsorption/desorption, speeding up water dissociation, enhancing hydrogen adsorption/desorption for HER, and lowering the energy barrier for OER, ultimately boosting OWS efficiency. The defect-rich, low-crystalline NiCoSx shell, bonded to the crystalline core via Ni–S–Co bonds, serves as a protective armor, enabling dynamic reconstruction into NiCoOOH and suppresses sulfide leaching, ensuring catalytic stability. The optimized NiCoSx@Ni3S2 achieves low HER/OER overpotentials of 346/520 mV@1000 mA cm−2, evidenced by an ultralow cell voltage of 2.10 V@1000 mA cm−2 for OWS and long-term durability up to 400 h. The work paves a novel way to fabricate sulfur-based electrocatalysts with high yet balanced activity and stability for OWS via an interface engineering strategy.