Tailoring of cobalt phosphide anchored nitrogen and sulfur co-doped three dimensional graphene hybrid: Boosted electrocatalytic performance towards hydrogen evolution reaction
By Karaman, Ceren; Karaman, Onur; Atar, Necip; Yola, Mehmet Lütfi
Published in Electrochimica Acta
2021
Abstract
The tailoring of a high-performance, low-cost hybrid electrocatalysts with excellent stability in acidic media for hydrogen evolution reaction (HER) has gain paramount importance. Herein, the cobalt phosphide decorated nitrogen and sulfur co-doped three dimensional graphene (CoP@N,S-3D-GN) electrocatalyst was synthesized via a simple two step production pathway including hydrothermal self-assembly and low-temperature phosphidation. Compared both with CoP-anchored 3D-GN (CoP@3D-GN) and N,S-co-doped 3D-GN (N,S-3D-GN) samples, profiting from the synergistic merits of co-doping and metal phosphide, CoP@N,S-3D-GN delivers boosted electrocatalytic activity towards HER with an overpotential of only 118 mV at 10 mA.cm−2, a Tafel slope of 50 mV.dec−1 and an exchange current density of 2.2 × 10−2 mA.cm−2. Furthermore, it preserves its electrocatalytic activity for both after 1000 cyclic voltammetry cycles at 100 mV.s−1 potential scan rate and at least 50 h under 120 mV overpotential. This work provides rational route for engineering of metal phosphides anchored 3D-graphene hybrid electrocatalysts to boost the HER catalytic performance.