FeP-CoP Nanocubes In Situ Grown on Ti3C2Tx MXene as Efficient Electrocatalysts for the Oxygen Evolution Reaction

Owing to the tunable structure and component, Prussian blue analogues (PBAs) and their derivatives have attracted great interest for a variety of applications, especially oxygen evolution reaction (OER). Herein, PBA-derived FeP-CoP nanocubes dispersed on Ti3C2Tx MXene have been fabricated by in situ coprecipitation and subsequent phosphorization process. We found that Ti3C2Tx MXene reduced the size of FeP-CoP nanocubes leading to more active sites, and the strong coupling interaction between FeP-CoP and Ti3C2Tx MXene resulted in higher intrinsic activities and faster charge transfer kinetics. Thus, the optimized FeP-CoP/Ti3C2Tx-5 delivers a low overpotential of 270 mV to drive 10 mA cm–2 and a small Tafel slope of 49.1 mV dec–1 in 1.0 M KOH. This study provides an efficient strategy to prepare metal phosphides and MXene hybrids with unique structures for electrocatalytic water splitting.