Application of Fe${}_2$V${}_4$O${}_{13}$ nanoparticles towards the electrocatalysis of oxygen evolution and hydrogen evolution reaction

The production and use green hydrogen fuel is attracted significantly in recent years owing to its high energy density and zero carbon emission. In this paper, Fe${}_2$V${}_4$O${}_{13}$ nanoparticles of size 22 nm are coated on the nickel foam substrate and this modified electrode is used as electrode towards the electrocatalysis of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline electrolyte. The Fe${}_2$V${}_4$O${}_{13}$ nanoparticles exhibit high electrochemical active surface area of 2652 cm${}^{-2}$ which is about ∼ 2 and ∼ 100 times higher than that of RuO${}_2$ (1302 cm${}^{-2}$) and bare nickel foam (22.5 cm${}^{-2}$). The observed high electrochemical active surface area for Fe${}_2$V${}_4$O${}_{13}$ nanoparticles results in enhanced OER and HER performance where it requires an overpotentials of 310 mV in OER and - 181 mV in HER to deliver the high current density of 100 mA cm${}^{-2}$. The electrochemical activity of the proposed Fe${}_2$V${}_4$O${}_{13}$ nanoparticles evidenced as a competitive electrocatalyst for both OER and HER.