Electrocatalytic Oxidation in Alcohol Fuel Cells

Electrocatalytic oxidation in alcohol fuel cells converts the chemical energy of small organic molecules directly into electricity by means of surface reactions at a catalyst–electrolyte interface. In these devices, a liquid alcohol such as methanol, ethanol or isopropanol is oxidised at the anode, releasing protons and electrons. The protons traverse a proton‐conducting membrane while the electrons flow through an external circuit to drive a load. At the cathode, oxygen is reduced and combines with protons to form water. The process relies critically on electrocatalysts—often based on platinum‐group metals or their alloys—that must balance high activity, resistance to poisoning by intermediates and long‐term stability under acidic or alkaline conditions. Key challenges include minimising fuel crossover through the membrane, suppressing the formation of carbonaceous deposits and improving mass transport within porous catalyst layers. A rational design of bimetallic and ternary nanoparticle catalysts has led to enhanced rates of C–H and C–C bond cleavage, lower onset potentials and reduced dissolution under operating conditions. This technology promises compact, low‐temperature power sources for portable devices and distributed energy systems, with global implications for sustainable transport and off‐grid electricity generation.

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Electrocatalytic Oxidation in Alcohol Fuel Cells publication trend

The graph below shows the total number of articles in electrocatalytic oxidation in alcohol fuel cells across all publications each year (not limited to Nature Index journals).

Technical terms

Electrocatalytic oxidation: The process by which an electrocatalyst lowers the activation energy for the oxidation of a fuel molecule at an electrode surface.

Direct alcohol fuel cell (DAFC): A type of fuel cell that directly oxidises liquid alcohols at the anode without prior reforming to hydrogen.

Proton exchange membrane (PEM): A solid polymer electrolyte that selectively conducts protons from anode to cathode while blocking electrons and reactant crossover.

Onset potential: The electrode potential at which oxidation of the fuel begins with detectable current.

Fuel crossover: The undesired migration of fuel molecules through the membrane to the cathode, leading to fuel loss and reduced efficiency.

Bifunctional mechanism: A catalytic pathway in which one metal provides oxygen‐containing species (e.g., OH_ads) and another metal facilitates fuel dehydrogenation.

References

1. Stability of Bimetallic Pt x Ru y – From Model Surfaces to Nanoparticulate Electrocatalysts. ACS Materials Au (2024).
2. Isopropanol electro-oxidation on Pt-Ru-Ir: A journey from model thin-film libraries towards real electrocatalysts. Electrochimica Acta (2023).
3. Efficient Electro‐Oxidation of 2‐Propanol at Platinum‐ and Gold‐Modified Palladium Nanocatalysts. Journal of Chemistry (2023).