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...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-Ni_(3)S_(2)@NiFe-MOF/NF)are fabricated,in which the Fe-Ni_(3)S_(2) 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-Ni_(3)S_(2)@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-Ni_(3)S_(2)@Ni Fe-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.展开更多
基金financially supported by the Natural Science Foundation of Shandong Province (ZR2020ZD10)the National Natural Science Foundation of China (21775142)。
文摘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-Ni_(3)S_(2)@NiFe-MOF/NF)are fabricated,in which the Fe-Ni_(3)S_(2) 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-Ni_(3)S_(2)@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-Ni_(3)S_(2)@Ni Fe-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.
