The article explores cutting-edge methods for utilizing water as a resource for catalytic hydrogenation processes. Researchers have developed nanomaterials that enable electrocatalytic organic hydrogenation using water as a sustainable hydrogen source. Additionally, innovative strategies such as photocatalytic transfer hydrogenation reactions and electrolytic deuteration of unsaturated bonds have been designed to advance hydrogenation reactions. The research also delves into chemical-reductant-free electrochemical deuteration processes, showcasing the potential for environmentally friendly hydrogenation methods. Furthermore, catalytic transformations of alcohols to carboxylic acid salts and H2 have been achieved by utilizing water as the oxygen atom source, demonstrating the versatility of water in catalytic reactions. Studies have also highlighted the electrochemical induction of nickel catalysis for oxygenation reactions with water, paving the way for efficient oxygenation processes. Moreover, trivalent nickel has been shown to catalyze the electroconversion of alcohols to carboxylic acids, indicating the broad applicability of water-based catalytic reactions.