<br>电子重新分布的NiCo@NiFe-LDH核壳异质结构显着增强电化学水分解,Inorganic Chemistry

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电子重新分布的NiCo@NiFe-LDH核壳异质结构显着增强电化学水分解
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2023-11-21 , DOI: 10.1021/acs.inorgchem.3c03115
Hao Chen ₁ , Jiangning Li ₁ , Linli Chen ₁ , Guochang Li ₁ , Wenna Zhao ₂ , Kai Tao ₁ , Lei Han ₁

Affiliation

层状双氢氧化物（LDH）是开发经济稳定且高效的水分解电催化剂的最有前途的前体之一。设计高性能电催化剂的有效策略是组装具有可调电子结构的核壳异质结构。在这项工作中，通过简单的水热法和随后在泡沫镍上的电沉积方法开发了三种核壳异质结构电催化剂（NiCo@NiFe-LDH100/150/200）。其中，NiCo@NiFe-LDH150/NF表现出最好的析氧反应电催化活性和长期稳定性，以197 mV的低过电势提供10 mA cm ^–2的电流密度。此外，以NiCo@NiFe-LDH150/NF为阴极和阳极的高效稳定碱性电解池在10 mA cm ^–2的电流密度下实现了1.66 V的电压，并在20 mA cm –2的电流密度下实现了超长稳定性。 200 mA cm ^–2 200 小时。密度泛函理论计算揭示了NiCo@NiFe-LDH150/NF核壳结构异质界面处的强电子相互作用，有效提高了本征电子电导率和离子扩散动力学，为材料的电催化性能做出了重要贡献。该工作为异质结界面的构建电化学水分解材料的选择提供了新的思路。

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Electron-Redistributed NiCo@NiFe-LDH Core–Shell Heterostructure for Significantly Enhancing Electrochemical Water Splitting

Layered double hydroxides (LDHs) are some of the most promising precursors for the development of economically stable and efficient electrocatalysts for water splitting. An effective strategy for designing excellent performance electrocatalysts is to assemble core–shell heterostructures with a tunable electronic structure. In this work, three core–shell heterostructure electrocatalysts (NiCo@NiFe-LDH100/150/200) are developed by a simple hydrothermal and subsequent electrodeposition method on Ni foam. Among them, NiCo@NiFe-LDH150/NF exhibits the best oxygen evolution reaction electrocatalytic activity and long-term stability with a low overpotential of 197 mV to deliver a current density of 10 mA cm^–2. In addition, an efficient and stable alkaline electrolytic cell with NiCo@NiFe-LDH150/NF both as the cathode and anode achieves a voltage of 1.66 V at a current density of 10 mA cm^–2 and realization of ultralong stability at current densities of 20 and 200 mA cm^–2 for 200 h. Density functional theory calculations reveal the strong electron interaction at the heterogeneous interface of the NiCo@NiFe-LDH150/NF core–shell structure, which effectively improves the intrinsic electron conductivity and ion diffusion kinetics and makes an important contribution to the electrocatalytic performance of the material. This work provides a new idea for the selection of materials for electrochemical water splitting by the construction of heterojunction interfaces.

更新日期：2023-11-21

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