Abstract

Engineering the abundant phase interface in hybrid materials for high electrocatalytic activity is an effective strategy to enhance the electrochemical performance. In this work, Ni-MOF/Ox-MOF is constructed through the “growth of MOF on MOF” strategy. Following with in-situ conformal transformation in alkaline solutions, Ni-MOF/LDH heterostructures are fabricated, which exhibit excellent water oxidation activity owing to the high surface area of Ni-MOF substrate and the well-tailored phase interfaces. In addition, the high stability of Ni-MOF/LDH is demonstrated in a Zn-air battery. In-situ Raman technique identifies that the Ni centers are the true active sites during water oxidation. DFT calculations demonstrate that the charge transfer and the conductivity at the Ni-MOF/LDH interfaces is highly enhanced. This work provides an efficient method of fabricating MOF/LDH heterostructures with optimized phase interfaces and offers new insights into OER.

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