The construction of heterogeneous interfaces and oxygen vacancy (Ov) is a very useful method to enhance the catalytic activity performance of catalysts. In this work, the high-performance a monometallic iron based bifunctional electrocatalyst FeS/FeOOH-ZnO@NF with oxygen vacancy (Ov) and heterogeneous interface is prepared by the ZnO template induced deposition method for the first time. Due to the synergistic effect of the heterogeneous interface of FeS/FeOOH-ZnO@NF and the oxygen vacancies of the ZnO, the FeS/FeOOH-ZnO@NF catalysts exhibited excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activity in alkaline media, with a low overpotential of 74 mV and 177 mV at 10 mA cm, respectively. It should be emphasized that the FeS/FeOOH-ZnO@NF || FeS/FeOOH-ZnO@NF electrolytic cell has an ultra-low decomposition voltage, only 1.41 V at 10 mA cm and 1.49 V at 20 mA cm, which is much lower than that currently reported in most literatures. This work will provide a new strategy and idea for the improvement of HER and OER electrocatalytic performance of transition metal-based catalyst.

中文翻译：

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具有丰富氧空位的自支撑单金属 FeS2/FeOOH-ZnO@NF 作为 OER 和 HER 高效稳定的电催化剂

异质界面和氧空位（Ov）的构建是增强催化剂催化活性性能的非常有用的方法。本工作首次采用ZnO模板诱导沉积方法制备了具有氧空位（Ov）和异质界面的高性能单金属铁基双功能电催化剂FeS/FeOOH-ZnO@NF。由于FeS/FeOOH-ZnO@NF异质界面和ZnO氧空位的协同作用，FeS/FeOOH-ZnO@NF催化剂表现出优异的析氢反应（HER）和析氧反应（OER）活性在碱性介质中，10 mA cm 时的过电势分别为 74 mV 和 177 mV。应该强调的是，FeS/FeOOH-ZnO@NF || FeS/FeOOH-ZnO@NF电解池具有超低分解电压，10 mA cm时仅为1.41 V，20 mA cm时仅为1.49 V，远低于目前大多数文献报道的分解电压。该工作将为过渡金属基催化剂的HER和OER电催化性能的提高提供新的策略和思路。