The deprived electrochemical kinetics of the oxygen evolution reaction (OER) catalyst is the prime bottleneck and remains the major obstacle in the water electrolysis processes. Herein, a facile hydrothermal technique was implemented to form a freestanding polyhedron-like CoO on the microporous architecture of Ni foam, its reaction kinetics enhanced through sulfide counterpart transformation in the presence of NaS, and their catalytic OER performances comparatively investigated in 1 M KOH medium. The formed CoS catalyst shows outstanding catalytic OER activity at a current density of 100 mA cm by achieving a relatively low overpotential of 292 mV compared to the pure CoO catalyst and the commercial IrO catalyst. This enhancement results from the improved active centers and conductivity, which boost the intrinsic reaction kinetics. Further, the optimized CoS catalyst exhibits admirable prolonged durability up to 72 h at varied current rates with insignificant selectivity decay. The energy dispersive X-ray spectroscopy (EDX) and Raman spectra measured after the prolonged OER stability test reveal a partial transformation of the active catalyst into an oxyhydroxide phase (i.e., CoOOH@CoS), which acts as an active catalyst phase during the electrolysis process.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547189PMC
http://dx.doi.org/10.3390/nano14211732DOI Listing

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