Advancements in Electrocatalytic Methanol Oxidation: Catalyst Design, Reaction Mechanisms, and Renewable Energy Applications

The electrochemical oxidation of methanol has emerged as a pivotal process in the development of sustainable energy systems, particularly in the context of direct methanol fuel cell (DMFC) and selective oxidation reactions. This review comprehensively examines the advancements in methanol oxidation, categorizing the processes into complete oxidation (methanol oxidation reaction, MOR) and selective oxidation (methanol selective oxidation reaction, MSOR). MOR facilitates the total conversion of methanol into carbon dioxide and water, while MSOR aims to produce valuable intermediates such as formate, which can enhance energy conversion efficiency and contribute to the synthesis of high-value chemicals. The review highlights the critical role of catalysts in these processes, detailing the progress in designing and optimizing various catalyst classes, including precious metals, transition metal oxides, and non-precious metal-based catalysts. Recent innovations in catalyst design, such as the use of nanostructured materials and hybrid systems, have shown promise in improving reaction rates and selectivity. Despite significant advancements, challenges remain, particularly in achieving high activity, selectivity, and stability under operational conditions. Future research directions are identified, emphasizing the need for scalable catalyst production and integration of methanol oxidation processes into existing energy infrastructures. This review underscores the importance of methanol oxidation in the broader context of energy conversion and storage, paving the way for the development of more efficient and sustainable energy systems.