Interface Catalysts of Ni3Fe1 Layered Double Hydroxide and Titanium Carbide for High-Performance Water Oxidation in Alkaline and Natural Conditions

The electrocatalytic oxygen evolution reaction (OER)is importantfor many renewable energy technologies. Developing cost-effectiveelectrocatalysts with high performance remains a great challenge.Here, we successfully demonstrate our novel interface catalyst comprisedof Ni3Fe1-based layered double hydroxides (Ni3Fe1-LDH) vertically immobilized on a two-dimensionalMXene (Ti3C2T x )surface. The Ni3Fe1-LDH/Ti3C2T x yielded an anodic OER currentof 100 mA cm(-2) at 0.28 V versus reversible hydrogenelectrode (RHE), nearly 74 times lower than that of the pristine Ni3Fe1-LDH. Furthermore, the Ni3Fe1-LDH/Ti3C2T x catalyst requires an overpotential of only 0.31 V versus RHE todeliver an industrial-level current density as high as 1000 mA cm(-2). Such excellent OER activity was attributed to thesynergistic interface effect between Ni3Fe1-LDHand Ti3C2T x . Densityfunctional theory (DFT) results further reveal that the Ti3C2T x support can efficientlyaccelerate the electron extraction from Ni3Fe1-LDH and tailor the electronic structure of catalytic sites, resultingin enhanced OER performance.