Tailored Polyoxometalates (POMs) For Next-Generation Energy, Catalysis, and Environmental Remediation: Structural Design, Mechanistic Insight, and Application Frontiers

Abstract

Tailored polyoxometalates (POMs) have emerged as a versatile class of molecular metal-oxide clusters at the forefront of next-generation energy, catalytic, and environmental technologies. Their exceptional structural tunability, multi-electron redox flexibility, and rich photochemical behaviour enable precise control over charge-transfer processes, catalytic pathways, and interfacial reactivity. Recent advances in POM structural design, including lacunary engineering, metal substitution, and organic-inorganic hybridization, have expanded their functional landscape, yielding materials with enhanced stability, selectivity, and application specific performance. These engineered architectures underpin major breakthroughs in electrochemical energy storage, solar-driven water splitting, CO₂ reduction, organic transformations, and advanced oxidation processes for environmental remediation. Mechanistic insights gained from spectroscopic and computational studies further illuminate POM-mediated electron transfer, proton-coupled electron dynamics, and photocatalytic activation pathways, offering a foundation for rational catalyst design. Despite these advancements, challenges persist regarding long-term stability, scalability, and environmental impacts, necessitating continued innovation in material integration and device-level implementation. This review consolidates current progress in POM structural tailoring, mechanistic understanding, and application frontiers, and highlights emerging opportunities for leveraging these molecularly precise systems in sustainable energy, catalysis, and environmental technologies.