(Digital Presentation) Facile and Efficient Synthesis of Hollow Leaf-Shaped Iron Doped Nickel Cobalt Layered Double Hydroxide Using 2-D Metal-Organic Frameworks for Oxygen Evolution Reaction

Abstract

The oxygen evolution reaction (OER) at the anode is of prime importance in electrochemical water splitting. Recently, layered double hydroxide (LDH) has been considered as one of the most effective materials for OER catalysts which are prone to hydrolysis and oxidation under OER conditions. Metal-organic frameworks (MOFs) are new class of porous materials with high crystallinity and high internal surface area. Based on their properties, the design of LDH based on morphology-controlled MOFs is gaining increasing attention. In this study, we report a novel approach to fabricate hollow leaf-shaped iron doped nickel cobalt LDH (Fe-NiCoLDH) based on 2D leaf-shaped ZIF (ZIF-L). Iron doping played an important role to enhance the specific surface area as well as the pore structure, resulting in improvement of the OER performance. Among the investigated Fe concentrations (from 40 to 80 mg) in this study, Fe60-NiCo LDH showed the highest electrocatalyst performance for OER of 10 mA cm-2 at 253 mV as well as high stability for 20 h. The design of nanostructures such as leaf-shaped LDH has great potential in enhancing OER efficiency.