Developing an industrially relevant electrode with high catalytic activity, stability, and tunable composition/size for large-scale water electrolysis is a significant challenge. We have created an integrated electrode (NFM30-N) for the oxygen evolution reaction (OER) using a facile top-down approach that combines arc melting with dealloying-oxidation. Due to the dealloying-oxidation effect, the as-derived porous amorphous M–O, M–OH, and M–OOH (M = Ni, Fe) nanocones cover the basic NiFeMn alloy. This integrated design enables NFM30-N to exhibit outstanding OER performance at high current densities, requiring low overpotentials of only 282 and 323 mV to achieve large current densities of 100 and 500 mA cm, respectively. It also displays a small Tafel slope of 44.1 mV dec and remarkable stability for over 100 h at 100 and 500 mA cm. When used as an anode, a two-electrode electrolyzer cell with NFM30-N at 500 mA cm only requires a cell voltage of 1.619 V and exhibits excellent stability, with almost no performance degradation after continuous chronopotentiometry test for each 100 h at 500 and 100 mA cm. This exceptional OER electrocatalytic performance is attributed to the integrated structure providing high electrical conductivity and stability, the presence of numerous active sites due to dealloying and the amorphous structure, and the promotion of the OER process by M–O, M–OH, and M–OOH species. This work offers a novel idea for fabricating integrated, industrially relevant electrocatalytic electrodes through traditional metallurgy combined with dealloying-oxidation.

中文翻译：

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轻松自上而下制造集成非晶 NiFe 基电催化电极，实现高电流和长寿命析氧


开发用于大规模水电解的具有高催化活性、稳定性和可调节成分/尺寸的工业相关电极是一项重大挑战。我们使用一种简便的自上而下方法，将电弧熔化与脱合金氧化相结合，创建了一种用于析氧反应 (OER) 的集成电极 (NFM30-N)。由于脱合金-氧化效应，衍生的多孔非晶M-O、M-OH和M-OOH（M = Ni，Fe）纳米锥覆盖了基本的NiFeMn合金。这种集成设计使NFM30-N能够在高电流密度下表现出出色的OER性能，仅需要282和323 mV的低过电势即可分别实现100和500 mA cm的大电流密度。它还显示出 44.1 mV dec 的小塔菲尔斜率以及在 100 和 500 mA cm 电流下超过 100 小时的卓越稳定性。当使用NFM30-N的两电极电解池作为阳极时，在500 mA cm下仅需要1.619 V的池电压，并且表现出优异的稳定性，在500和100每100 h的连续计时电位测试后几乎没有性能下降。毫安厘米。这种卓越的OER电催化性能归因于提供高电导率和稳定性的集成结构、由于脱合金和非晶结构而存在的大量活性位点以及M-O、M-OH和M对OER过程的促进–OOH 物种。这项工作为通过传统冶金结合脱合金-氧化来制造集成的、工业相关的电催化电极提供了一种新颖的想法。