For production hydrogen with water electrolysis to promote the development of a hydrogen-energy economy, it is crucial to develop efficient, durable, and non-noble metal electrocatalysts for the oxygen evolution reaction (OER). Transition metal selenides have been considered as promising alternatives for OER due to their excellent conductivity. Herein, FeOOH-decorated Fe-doped NiSe on NiFe foam (FeOOH@Fe-NiSe@NiFe) was synthesized with an autologous growth approach, where the NiFe foam was used as an Fe and Ni resource. The FeOOH@Fe-NiSe@NiFe electrode exhibits excellent electrocatalytic performance with an overpotential of 224 mV at 10 mA cm^–2, a small Tafel slope of 52.67 mV dec^–1, and remarkable stability. Results confirm that the morphology and electronic structure of designed electrocatalysts can be significantly tailored due to the introduction of Fe. The designed FeOOH@Fe-NiSe@NiFe electrode also possesses superior aerophobicity, which ensures fast mass transfer during water splitting processes. As a result, the electrocatalytic activity is improved remarkably. In addition, the actual active sites of designed electrocatalysts were also systematically investigated. Experimental studies demonstrate that the Fe/NiOOH on the surface of Fe-NiSe, which in situ converses from Fe-NiSe, can serve as the intrinsic active sites toward the OER. Thus, this work can provide a new methodology to designing durable and efficient electrocatalysts.

中文翻译：

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用于高性能水氧化的 FeOOH 装饰的 Fe 掺杂硒化镍分层阵列

为了通过水电解制氢以促进氢能经济的发展，开发用于析氧反应（OER）的高效、耐用和非贵金属电催化剂至关重要。过渡金属硒化物由于其优异的导电性而被认为是 OER 的有希望的替代品。在此，采用自体生长方法合成了 NiFe 泡沫上的 FeOOH 装饰的 Fe 掺杂 NiSe（FeOOH@Fe-NiSe@NiFe），其中 NiFe 泡沫用作 Fe 和 Ni 资源。FeOOH@Fe-NiSe@NiFe 电极表现出优异的电催化性能，在 10 mA cm ^–2时过电位为 224 mV，Tafel 斜率为 52.67 mV dec ^–1，且稳定性显着。结果证实，由于 Fe 的引入，设计的电催化剂的形态和电子结构可以显着调整。所设计的 FeOOH@Fe-NiSe@NiFe 电极还具有优异的疏气性，可确保水分解过程中的快速传质。结果，电催化活性显着提高。此外，还系统地研究了设计的电催化剂的实际活性位点。实验研究表明，与 Fe-NiSe 原位转换的 Fe-NiSe 表面的 Fe/NiOOH 可以作为 OER 的内在活性位点。因此，这项工作可以为设计耐用和高效的电催化剂提供一种新方法。