Developing highly efficient, easy-to-make and cost-effective bifunctional electrocatalysts for water splitting with lower cell voltages is crucial to producing massive hydrogen fuel. In response, the coupled hierarchical Ni/Fe-based MOF nanosheet arrays with embedded metal sulfide nanoclusters onto nickel foam skeleton (denoted as Fe-Ni3S2@NiFe-MOF/NF) are fabricated, in which the Fe-Ni3S2 clusters could effectively restrain the aggregation of the layer metal-organic frameworks (MOF) nanosheets and adjust the local electronic structures of MOFs nanosheets. Benefiting from the rapid charge transfer and the exposure of abundant active sites, the well-designed Fe-Ni3S2@NiFe-MOF/NF displays excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance. More importantly, when equipped in the alkaline water electrolyzer, the Fe-Ni3S2@NiFe-MOF/NF enables the system with a mere 1.6 V for achieving the current density of 10 mA cm(-2). This work offers a paradigm for designing efficient bifunctional HER/OER electrocatalysts based on the hybrid materials of nanostructured metal sulfide and MOF.

中文翻译：

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将 NiFe 基金属有机骨架纳米片阵列与嵌入的 Fe-Ni3S2 团簇偶联作为全水分解的高效双功能电催化剂

开发高效、易于制造且具有成本效益的双功能电催化剂，用于在较低的电池电压下分解水，对于生产大量氢燃料至关重要。作为回应，制备了在泡沫镍骨架上嵌入金属硫化物纳米团簇的耦合分层 Ni/Fe 基 MOF 纳米片阵列（表示为 Fe-Ni3S2@NiFe-MOF/NF），其中 Fe-Ni3S2 团簇可以有效抑制层状金属有机骨架 (MOF) 纳米片的聚集并调整 MOF 纳米片的局部电子结构。得益于快速的电荷转移和大量活性位点的暴露，精心设计的 Fe-Ni3S2@NiFe-MOF/NF 表现出优异的析氧反应 (OER) 和析氢反应 (HER) 性能。更重要的是，当配备在碱性水电解槽中时，Fe-Ni3S2@NiFe-MOF/NF 使系统仅需 1.6 V 即可实现 10 mA cm(-2) 的电流密度。这项工作为基于纳米结构金属硫化物和 MOF 的杂化材料设计高效双功能 HER/OER 电催化剂提供了范例。