In-situ self-grown binder-free FeCr co-doped Ni3P/NF with green phosphorus source and enhanced water splitting performance

Water electrolysis is vital for producing green hydrogen, yet widespread deployment is impeded by the steep cost of noble-metal electrocatalysts. In this work, a binder-free Fe and Cr co-doped Ni 3 P electrocatalyst (FeCr-Ni 3 P/NF) was successfully fabricated via direct growth on NF, with biomass-derived sodium phytate serving as the P supplier to eliminate the risk of toxic PH 3 emission in conventional synthesis. Benefiting from the unique nanosheet-layered structure and electronic synergy, FeCr-Ni 3 P/NF displays outstanding bifunctional electrocatalytic performance and durability in 1 M KOH. With low overpotentials of 270 mV (OER, 100 mA cm -2 ) and 137 mV (HER, 10 mA cm -2 ). Subsequent structural characterizations further reveal the distinct surface reconstruction behavior of FeCr-Ni 3 P/NF under different catalytic conditions. The pre-catalysts are reconstructed into NiOOH after OER stability tests and converted to Ni(OH) 2 after HER tests. Moreover, the composite structure formed by the precatalyst and in-situ generated nickel (oxy)hydroxide further enhances the overall catalytic performance.