Chunxiao Li, Yuying Feng, Jiahui Jiang, Jingjing Zhu, Heju Gao, Ting Zhao, Guancheng Xu* and Li Zhang*,
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引用次数: 0
Abstract
Nickel-based sulfides have been proven to be excellent oxygen evolution reaction (OER) electrocatalysts due to their excellent electrical conductivity, but their poor stability hinders their application in practical applications. To address this issue, defect engineering has been proposed as a viable strategy to enhance the electronic structure of the catalyst and further boost the OER performance. Herein, a MOF-derived Sn-doped NiS/Ni3S2 nanostructure grown in situ on nickel foam (Sn–NixSy/NF) has been designed as an active OER electrocatalyst. The morphology of the material was significantly impacted by the addition of the Sn elements, nanorods modified with nanoparticles providing more active sites. Moreover, the introduction of Sn elements induced the generation of sulfur vacancies (Vs), enhanced electron transfer, promoted electron redistribution, and increased the charge transfer rate. All of these endow the Sn–NixSy/NF-T with exceptionally low overpotentials of 104 and 286 mV to achieve a current density of 10 and 100 mA cm–2 for OER. Moreover, the Sn–NixSy/NF-T showed long-term stability, maintaining 100 h at current densities of 100 mA cm–2. In short, this work opened a route for engineering defects to boost the OER.
镍基硫化物因其出色的导电性而被证明是极佳的氧进化反应(OER)电催化剂,但其较差的稳定性阻碍了其在实际应用中的应用。为解决这一问题,有人提出了缺陷工程这一可行的策略,以增强催化剂的电子结构,进一步提高 OER 性能。在此,我们设计了一种在镍泡沫上原位生长的掺杂 Sn 的 MOF 衍生 NiS/Ni3S2 纳米结构(Sn-NixSy/NF),作为一种活性 OER 电催化剂。锡元素的加入对材料的形态产生了显著影响,纳米颗粒修饰的纳米棒提供了更多的活性位点。此外,锡元素的引入诱导了硫空位(Vs)的产生,增强了电子转移,促进了电子再分布,并提高了电荷转移速率。所有这些都赋予了 Sn-NixSy/NF-T 104 mV 和 286 mV 的超低过电位,使 OER 的电流密度分别达到 10 mA 和 100 mA cm-2。此外,Sn-NixSy/NF-T 还具有长期稳定性,在 100 mA cm-2 的电流密度下可维持 100 小时。总之,这项工作为利用工程缺陷提高 OER 开辟了一条途径。
期刊介绍:
ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.