Coupling Ir single atom with NiFe LDH/NiMo heterointerface toward efficient and durable water splitting at large current density

Applied Catalysis B: Environment and Energy Pub Date : 2024-08-27 DOI:10.1016/j.apcatb.2024.124548

Yuewen Wu, Mingpeng Chen, Huachuan Sun, Tong Zhou, Xinqi Chen, Guohao Na, Guoyang Qiu, Dequan Li, Nan Yang, Hongshun Zheng, Yun Chen, Boxue Wang, Jianhong Zhao, Yumin Zhang, Jin Zhang, Feng Liu, Hao Cui, Tianwei He, Qingju Liu

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Abstract

Developing efficient and robust bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at large current density is important to facilitate the industrial water splitting. Herein, a promising strategy is presented to couple Ir single atom with NiFe LDH/NiMo heterointerface. Ir-NiFe LDH/NiMo requires ultralow overpotentials of 139/236 mV and 350/450 mV to deliver large current densities of 500 and 1000 mA cm for HER/OER in 1 M KOH. Moreover, the electrode shows remarkable durability of 10000 cycles and long-term durability at 500 mA cm over 500 h for both HER and OER. The water electrolyzer exhibits a low cell voltage of 1.84 V to attain 500 mA cm. The theoretical calculations decipher that the Ir single atom modulates the electronic property of catalyst, which tunes the adsorption strength of the key reaction intermediates and boosts the overall water splitting.

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将 Ir 单原子与 NiFe LDH/NiMo 异质表面耦合，实现大电流密度下高效持久的水分离

开发高效、稳健的双功能电催化剂，在大电流密度下同时进行氢进化反应（HER）和氧进化反应（OER），对于促进工业用水的分离非常重要。本文提出了一种将铱单原子与 NiFe LDH/NiMo 异质界面耦合的可行策略。Ir-NiFe LDH/NiMo 需要 139/236 mV 和 350/450 mV 的超低过电位，才能在 1 M KOH 中为 HER/OER 提供 500 和 1000 mA cm 的大电流密度。此外，该电极在 10000 次循环中表现出卓越的耐久性，在 500 mA cm 的条件下，HER 和 OER 的长期耐久性超过 500 h。水电解槽的电池电压低至 1.84 V，即可达到 500 mA cm。理论计算表明，Ir 单原子调节了催化剂的电子特性，从而调整了关键反应中间产物的吸附强度，提高了整体水分离效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Catalysis B: Environment and Energy

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