By introducing chromium into a nickel–iron layered double hydroxide (LDH), a nickel iron chromium hydroxide nanomesh catalyst has been achieved on nickel foam substrate via electrodeposition followed by partial etching of chromium. The electrodeposited chromium acts as a sacrificial template to introduce holes in the LDH to increase the electrochemically active surface area, and the remaining chromium synergistically modulates the electronic structure of the composite. The obtained electrode shows extraordinary performance for oxygen evolution reaction and excellent electrochemical stability. The onset potential of the as-prepared electrode in 1 M KOH is only 1.43 V vs RHE, and the overpotential to achieve a high current density of 100 mA·cm^–2 is only 255 mV, outperforming benchmark nonprecious NiFe hydroxide composite electrode in alkaline media.

中文翻译：

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氢氧化镍铁铬多孔纳米片作为水氧化的高级电催化剂

通过将铬引入到镍铁层状双氢氧化物（LDH）中，通过电沉积然后部分腐蚀铬的方法，在镍泡沫基体上获得了镍铁氢氧化铬纳米网状催化剂。电沉积的铬充当牺牲模板，以在LDH中引入孔以增加电化学活性表面积，而剩余的铬则协同地调节复合材料的电子结构。所得电极显示出优异的氧释放反应性能和优异的电化学稳定性。制备好的电极在1 M KOH中的起始电势仅为RHE的1.43 V，并且过电势可实现100 mA·cm ^–2的高电流密度 仅为255 mV，在碱性介质中的性能优于基准非贵金属NiFe氢氧化物复合电极。