A Review on Recent Advances in Carbon-Based Catalysts for Alcohol Electro-Oxidation

The escalating global demand for sustainable energy technologies has driven significant interest in direct alcohol fuel cells (DAFCs) as efficient power sources. However, their widespread commercialization is hindered by the reliance on expensive platinum-group metal (PGM) catalysts, which suffer from high cost, susceptibility to CO poisoning, and limited stability. This creates a critical knowledge gap: the urgent need for developing high-performance, cost-effective, and durable catalytic systems that can efficiently facilitate the alcohol electro-oxidation reaction (AOR). This review addresses this gap by comprehensively examining the recent advances in carbon-based materials as transformative catalyst supports and PGM-free alternatives for AOR. The fundamental premise is that carbon nanostructures such as graphene, carbon nanotubes, and heteroatom-doped carbons offer a uniquely tunable platform. Their exceptional conductivity, high surface area, and versatile functionalization capabilities make them ideal for enhancing catalytic performance. We explore how the strategic integration of noble and transition metals with these carbon supports can create synergistic effects, significantly boosting catalytic activity, improving durability, and enhancing resistance to CO intermediate poisoning. By moving beyond conventional PGM catalysts, this review provides a roadmap for designing next-generation electrocatalysts. It highlights how advanced engineering of carbon supports and hybrid nanostructures can optimize catalyst performance, paving the way for more economically viable and efficient energy conversion devices. Ultimately, this body of work not only consolidates critical recent breakthroughs but also charts a course for developing sustainable catalytic systems crucial for the future of renewable energy technology.