Preparation of Co based catalysts doped with different cations and their application in high current electrolysis of water

Since the Industrial Revolution, fossil fuels have been the driving force behind rapid socio-economic development. However, their non-renewable nature, environmental pollution, and energy scarcity now pose a significant threat to human sustainability. Hydrogen energy, recognized for its cleanliness and renewability, offers significant potential in tackling these challenges. In recent years, water electrolysis for hydrogen production has garnered considerable attention due to its potential, but its high energy consumption has limited its widespread application. In this study, we developed cobalt-based catalysts doped with various cations for high-current water electrolysis hydrogen production and investigated the impact of different valence ion doping. The findings indicated that doping with high-valence metals notably boosted the oxygen evolution reaction (OER) performance relative to low-valence metals. This enhancement is ascribed to the elevated charge density that boosts the adsorption rate of hydroxide ions and, in turn, escalates catalytic activity. Among the catalysts evaluated, the (Mo, Mn)-Co-LDH/NF catalyst stood out, delivering a current density of 1000 mA/cm 2 at an overpotential of merely 480 mV. This discovery offers crucial guidance for the development of catalysts in hydrogen evolution reactions, paving a potential way for the progress of sustainable energy solutions.