Fe, P co-doped hybrid electrocatalyst for synergistic enhancement of electrocatalytic hydrogen evolution reaction durability performance.

Defect engineering has been widely applied to improve the hydrogen evolution reaction (HER) performance of MoS. In this work, a co-doped electrocatalyst on carbon fiber paper (CFP) for HER was prepared by coupling with simple hydrothermal and gas-phase phosphorylation process to improve the durability of the catalyst while enhancing the electrocatalytic performance (Fe-P-MoS/CFP). The results showed that the overpotential at a current density of 10 mA cm (η) of Fe-P-MoS/CFP was only 130 mV, which was much lower than those of other undoped and single-metal atom doping electrocatalysts. Electronic interactions between Fe, P and MoS reduced the local electron densities and changed the electronic structure of Mo and S, leading to the generation of additional p orbitals in the S site, thus optimizing the adsorption-desorption energy of hydrogen in the S site. In addition, compared to Fe-MoS/CFP, Fe-P-MoS/CFP showed better electrocatalytic durability in acidic conditions. The co-doping technique proposed within this study stands to offer a novel approach for amplifying the catalytic activity and stability of electrocatalysts.