Interfacial engineering of metal–organic framework derived hierarchical CoP–Ni5P4 nanosheet arrays for overall water splitting†
*ab
Abstract
To sustainably develop an economical, efficient and stable non-noble metal hydrogen production catalyst is still an essential challenge. Herein, a hierarchical CoP–Ni5P4 nanosheet array self-supported electrode (CoP–Ni5P4/NF) for water splitting was successfully constructed by a simple MOF calcination method. CoP–Ni5P4/NF exhibited outstanding performance for overall alkaline water splitting, and the potential is only 1.47 V at 10 mA cm−2 with outstanding stability beyond 50 h. Combining the experimental analyses and theoretical calculations, it is revealed that the construction of the hierarchical CoP–Ni5P4 nanosheet array self-supported electrode increases the exposure of active sites and enhances the conductivity and stability. Moreover, the interfacial effect of CoP–Ni5P4 effectively regulates the electronic structure and reduces the adsorption energy of intermediates, thus improving water electrolysis kinetics. This work provides fresh impetus to the design of MOF-derived two-dimensional heterogeneous catalysts for overall water splitting.
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