Electrochemical Hydrogen Evolution Catalyzed by Nanostructured Cobalt Phosphide Dispersed on g-C3N4 Nanosheets

Developing low-cost electrocatalysts remains central for sustainable hydrogen production through electrolysis. Here, electrocatalytic performance of cobalt phosphide (CoP) supported on graphitic carbon nitride (g-C3N4) towards hydrogen evolution reaction is investigated. The performance of CoP/g-C3N4 is compared with that of bare CoP, which is tested in acidic medium. A substantial enhancement in electrocatalytic performance of CoP is recorded after dispersion on the surface of g-C3N4. In addition, stability of electrode comprised of CoP/g-C3N4 electrode is investigated. Electrical impedance and interfacial charge transfer kinetics of electrodes is studied by employing electrochemical impedance spectroscopy. Reaction mechanism was deduced by estimating Tafel slope.