Nickel-Cobalt-Iron Ternary Layered Double Hydroxide Nanoarrays for Superior Performance of Electrocatalytic Water Splitting

The design of high-performance and low-cost oxygen evolution reaction (OER) electrocatalysts is crucial for environment friendly hydrogen production. Some transition metals have been proven to be good substitutes noble due their unique electronic structural characteristics electrocatalytic performances, with examples including nickel cobalt, which are usually used prepare OER electrocatalysts. In this work, we synthesized three-dimensional Ni-Co-Fe ternary layered double hydroxide nanosheet array via hydrothermal process. Iron element was introduced into the Ni-Co based hydroxide. has a nanoarrays microstructure. Theoretical analysis confirms that by adjusting ratio Ni/Co/Fe, microstructure catalyst changes significantly. Attributed special nanostructure, catalysts show superior catalytic activities in (OER). results small overpotential 222 mV at current density 20 mA·cm−2 1.0 M KOH acquired. A Tafel slope 61.22 mVdec−1 maximum specific capacitance 239 Fg−1 also obtained.