Abstract Electrocatalysts of NiCoFe hydroxides have been prepared successfully by a simple hydrothermal method, which show excellent electrocatalytic properties. (delivering 10 mA cm−2 current density at 230 mV, with a Tafel slope of 72.7 mV·dec−1). Furthermore, in order to further improve its electrocatalysis properties, the NiCoFe hydroxide is reprocessed by vulcanizing and acid etching, respectively. The electrocatalytic properties of the NiCoFe hydroxides after vulcanization is further improved (delivering 10 mA cm−2 current density at 200 mV, with a Tafel slope of 46.3 mV·dec−1). Similarly, acid etching is also a simple and effective method to promote the OER catalytic activity, which resulted in an exfoliation process and multiple defects. The NiCoFe LTHs is stripped into a thinner nanosheet structure, and the electrochemical analysis shows excellent electrocatalytic properties (delivering 10 mA cm−2 current density at 184 mV, with a Tafel slope of 37.8 mV·dec−1). Both vulcanization and acid etching show better oxygen evolution capability than the pristine LTHs in alkaline conditions with a small Tafel slope and good durability. This work will break a new and inexpensive path to promote the catalytic capability in an alkaline condition.

中文翻译：

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NiCoFe层状三元氢氧化物的硫化和酸蚀增强析氧反应

摘要 通过简单的水热法成功制备了NiCoFe氢氧化物的电催化剂，具有优异的电催化性能。（在 230 mV 时提供 10 mA cm-2 电流密度，Tafel 斜率为 72.7 mV·dec-1）。此外，为了进一步提高其电催化性能，NiCoFe氢氧化物分别通过硫化和酸蚀刻进行再加工。硫化后 NiCoFe 氢氧化物的电催化性能得到进一步改善（在 200 mV 下提供 10 mA cm-2 电流密度，Tafel 斜率为 46.3 mV·dec-1）。同样，酸蚀刻也是一种简单有效的促进OER催化活性的方法，但会导致剥离过程和多重缺陷。NiCoFe LTHs 被剥离成更薄的纳米片结构，电化学分析显示出优异的电催化性能（在 184 mV 下提供 10 mA cm-2 电流密度，Tafel 斜率为 37.8 mV·dec-1）。在碱性条件下，硫化和酸蚀都表现出比原始 LTH 更好的析氧能力，具有较小的 Tafel 斜率和良好的耐久性。这项工作将开辟一条新的廉价途径，以提高碱性条件下的催化能力。