2D Ni‐Naphthalene‐2,6‐Dicarboxylic Acid Metal‐Organic Framework as Electrocatalysts for Efficient Overall Water Splitting

Two‐dimensional metal‐organic frameworks (MOFs) are regarded as promising electrocatalysts because of their high surface area and tunable compositions. Herein, a novel nickel‐based 2D MOF for efficient oxygen evolution reaction (OER) has been developed. Ni‐NDC MOF nanosheets (NDC = naphthalene‐2,6‐dicarboxylic acid) are successfully synthesized on a nickel foam (NF) through a surfactant‐assisted one‐step hydrothermal method. The resulting Ni‐NDC@NF possessing a high electrochemically active surface area of 3.06 mF cm−2 exhibits excellent OER performance with a low overpotential of 249 mV at 10 mA cm−2, a small Tafel slope of 74 mV dec−1, 100% faradaic efficiency, and long‐term stability of 24 h at least. For the application of a bifunctional catalyst, NiMo alloy is electrodeposited on the Ni‐NDC@NF to enhance hydrogen evolution reaction activity. The overall water splitting in a two‐elec…