Ascorbic Acid Fuel Cell Technologies

Ascorbic acid fuel cells represent a class of direct liquid fuel cells that exploit vitamin C (ascorbic acid) as a renewable and biocompatible energy carrier. At the anode, ascorbic acid undergoes electrochemical oxidation to dehydroascorbic acid, releasing electrons that travel through an external circuit to perform work, while a complementary reduction reaction occurs at the cathode. These systems offer intrinsic safety, low toxicity and facile handling compared with conventional hydrogen or methanol fuel cells. Key research thrusts encompass the design of robust electrocatalysts to lower overpotentials, the development of polymer electrolyte membranes (both proton- and anion-exchange types) to optimise ionic conductivity, and cell configurations that enhance mass transport and long-term stability. Ongoing challenges include catalyst degradation, membrane crossover of fuel or oxidant, and the need to balance power density with operational durability. Practical applications under investigation range from portable power packs and environmental sensors to implantable medical devices, underscoring the global significance of a truly green and decentralised energy solution.

Research from Nature Portfolio

Recent studies have demonstrated that heteroatom-doped porous carbon nanostructures can double the ascorbic acid oxidation current by creating abundant defect sites and facilitating reactant diffusion within the electrode. Another advance introduced a flexible membrane-electrode assembly based on anion-exchange polymers, achieving peak power densities exceeding 50 mW cm⁻² under ambient conditions and retaining over 80 per cent of initial output after 100 hours of continuous operation. In parallel, enzyme-inspired metal–organic framework-derived catalysts have been shown to selectively stabilise the ascorbate radical intermediate, thereby reducing side-reaction pathways and improving both activity and catalyst lifetime in neutral-pH configurations.

Ascorbic Acid Fuel Cell Technologies publication trend

The graph below shows the total number of articles in ascorbic acid fuel cell technologies across all publications each year (not limited to Nature Index journals).

Technical terms

Direct ascorbic acid fuel cell (DAAFC): A device that converts the chemical energy of ascorbic acid directly into electrical energy via electrochemical oxidation at the anode and reduction at the cathode.

Ascorbic acid oxidation reaction (AAOR): The electrochemical process in which ascorbic acid is oxidised to dehydroascorbic acid, releasing electrons at the anode.

Electrocatalyst: A material that accelerates an electrochemical reaction, such as AAOR, without being consumed in the process.

Proton-exchange membrane (PEM): A polymer electrolyte that selectively conducts protons, commonly used to separate electrodes in acidic fuel cell systems.

Anion-exchange membrane (AEM): A polymer electrolyte that transports anions, enabling alkaline operation and improved fuel crossover resistance.

References

1. An Unprecedented CeO2/C Non-Noble Metal Electrocatalyst for Direct Ascorbic Acid Fuel Cells. Nanomaterials (2023).
2. Effect of Temperature and Catholyte Concentration on the Performance of a Chemically Regenerative Fuel Cell. Johnson Matthey Technology Review (2018).
3. Environment-Friendly Ascorbic Acid Fuel Cell. Electrochem (2023).