Yu He, Kefan Shi, Xueqin Wang, Xingzi Zheng, Lanke Luo, Liu Lin, Zemin Sun, Genban Sun
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The synergistic doping of Fe and Ce optimized the microscopic morphology and the electronic structure of Ni<small><sub>3</sub></small>S<small><sub>2</sub></small>, which increased the exposure of catalytically active sites, enhanced the electron transfer rate in the OER process, and improved the intrinsic activity of the catalyst. The catalyst has an overpotential of 254 mV at 10 mA cm<small><sup>−2</sup></small> and a Tafel slope of 55.56 mV dec<small><sup>−1</sup></small>, and exhibits good electrocatalytic performance under alkaline conditions (1 M KOH). Compared with the original Ni<small><sub>3</sub></small>S<small><sub>2</sub></small> (363 mV at 10 mA cm<small><sup>−2</sup></small>), the overpotential of Fe,Ce-Ni<small><sub>3</sub></small>S<small><sub>2</sub></small>@NF is reduced by 109 mV. 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Ni<small><sub>3</sub></small>S<small><sub>2</sub></small> not only has the advantages of low cost, easy preparation, and environmental friendliness, but also attracts attention for its structure throughout the Ni–Ni bond, which provides metal-like electrical conductivity. In this work, the Fe and Ce double-doped Ni<small><sub>3</sub></small>S<small><sub>2</sub></small> nanoneedle array catalyst (Fe,Ce-Ni<small><sub>3</sub></small>S<small><sub>2</sub></small>@NF) was prepared by a one-step hydrothermal method. The synergistic doping of Fe and Ce optimized the microscopic morphology and the electronic structure of Ni<small><sub>3</sub></small>S<small><sub>2</sub></small>, which increased the exposure of catalytically active sites, enhanced the electron transfer rate in the OER process, and improved the intrinsic activity of the catalyst. The catalyst has an overpotential of 254 mV at 10 mA cm<small><sup>−2</sup></small> and a Tafel slope of 55.56 mV dec<small><sup>−1</sup></small>, and exhibits good electrocatalytic performance under alkaline conditions (1 M KOH). Compared with the original Ni<small><sub>3</sub></small>S<small><sub>2</sub></small> (363 mV at 10 mA cm<small><sup>−2</sup></small>), the overpotential of Fe,Ce-Ni<small><sub>3</sub></small>S<small><sub>2</sub></small>@NF is reduced by 109 mV. 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引用次数: 0
摘要
开发低成本、高效和稳定的电催化剂对于阳极氧进化反应(OER)至关重要。Ni3S2 不仅具有低成本、易制备、环保等优点,而且其贯穿 Ni-Ni 键的结构可提供类似金属的导电性,因此备受关注。本研究采用一步水热法制备了Fe和Ce双掺杂Ni3S2纳米针状阵列催化剂(Fe,Ce-Ni3S2@NF)。Fe和Ce的协同掺杂优化了Ni3S2的微观形貌和电子结构,增加了催化活性位点的暴露,提高了OER过程中的电子转移率,提高了催化剂的内在活性。该催化剂在 10 mA cm-2 时的过电位为 254 mV,Tafel 斜率为 55.56 mV dec-1,在碱性条件(1 M KOH)下表现出良好的电催化性能。与原来的 Ni3S2(10 mA cm-2 时为 363 mV)相比,Fe,Ce-Ni3S2@NF 的过电位降低了 109 mV。这为制备过渡金属和镧系金属双掺杂催化剂及其在电催化中的应用提供了一个新的可行方向。
Synergistic Fe,Ce doping of Ni3S2 for enhancing oxygen evolution reaction performance
The development of low-cost, efficient, and stable electrocatalysts is critical for the anodic oxygen evolution reaction (OER). Ni3S2 not only has the advantages of low cost, easy preparation, and environmental friendliness, but also attracts attention for its structure throughout the Ni–Ni bond, which provides metal-like electrical conductivity. In this work, the Fe and Ce double-doped Ni3S2 nanoneedle array catalyst (Fe,Ce-Ni3S2@NF) was prepared by a one-step hydrothermal method. The synergistic doping of Fe and Ce optimized the microscopic morphology and the electronic structure of Ni3S2, which increased the exposure of catalytically active sites, enhanced the electron transfer rate in the OER process, and improved the intrinsic activity of the catalyst. The catalyst has an overpotential of 254 mV at 10 mA cm−2 and a Tafel slope of 55.56 mV dec−1, and exhibits good electrocatalytic performance under alkaline conditions (1 M KOH). Compared with the original Ni3S2 (363 mV at 10 mA cm−2), the overpotential of Fe,Ce-Ni3S2@NF is reduced by 109 mV. This provides a new feasible direction for the preparation of transition metal and lanthanide metal double-doped catalysts and their application in electrocatalysis.