Electrocatalytic Oxidation of Ethylene Glycol in Alkaline Media

The electrocatalytic oxidation of ethylene glycol in alkaline media is a promising pathway for converting a readily available C₂ alcohol into electrical energy with minimal greenhouse‐gas emissions. In alkaline conditions, hydroxide ions facilitate both the deprotonation of the alcohol and the removal of intermediate poisoning species, leading to enhanced reaction kinetics and improved catalyst durability. The process relies on the adsorption of ethylene glycol molecules onto the surface of a heterogeneous electrocatalyst, followed by successive dehydrogenation and carbon–carbon bond‐cleavage steps that yield products such as oxalate, glycolate and carbonate, often with high selectivity. Efficient catalysts combine active sites for C–C bond scission with supports that ensure rapid electron transfer and mass transport. Advances in nanoscale engineering—ranging from alloying non‐precious metals to constructing mesoporous architectures—have driven substantial improvements in activity, stability and resistance to poisoning by carbonaceous intermediates. The global significance of this research lies in its potential to underpin direct ethylene glycol fuel cells, which can operate at low temperatures, use liquid fuels that are easy to store and transport, and offer a pathway to carbon‐neutral power generation in stationary and portable applications.

Research from Nature Portfolio

Recent studies have shown that iron‐group nanoalloys can achieve high selectivity for ethylene glycol oxidation to oxalic acid without CO₂ emission. A solid‐solution FeCoNi nanoalloy supported on carbon enables nearly quantitative conversion of ethylene glycol into C₂ products at low overpotentials in a strongly alkaline electrolyte. Atomic‐level mixing of Fe, Co and Ni within the alloy provides a unique ensemble of active sites that promote C–C bond cleavage and suppress carbon monoxide formation. When integrated into a membrane‐free cell, this catalyst supports sustained power densities comparable to precious‐metal systems, demonstrating the feasibility of wholly non‐noble‐metal direct ethylene glycol fuel cells.

Electrocatalytic Oxidation of Ethylene Glycol in Alkaline Media publication trend

The graph below shows the total number of articles in electrocatalytic oxidation of ethylene glycol in alkaline media across all publications each year (not limited to Nature Index journals).

Technical terms

Electrocatalytic oxidation: Catalysed electrochemical process in which a substrate donates electrons at the anode surface.

Alkaline media: A high-pH aqueous environment rich in hydroxide ions that influences reaction pathways and catalyst performance.

Direct ethylene glycol fuel cell: A fuel cell configuration that oxidises ethylene glycol at the anode to generate electricity without prior reforming.

Cyclic voltammetry: Electrochemical technique involving the cyclic variation of electrode potential to probe reaction kinetics and mechanistic features.

Chronoamperometry: Measurement of current as a function of time at a fixed electrode potential to assess catalyst activity and stability.

References

1. Quasihexagonal Platinum Nanodendrites Decorated over CoS2‐N‐Doped Reduced Graphene Oxide for Electro‐Oxidation of C1‐, C2‐, and C3‐Type Alcohols. Advanced Science (2022).
2. CO2-Free Power Generation on an Iron Group Nanoalloy Catalyst via Selective Oxidation of Ethylene Glycol to Oxalic Acid in Alkaline Media. Scientific Reports (2014).
3. Stimulation of ethylene glycol electrooxidation on electrodeposited Ni–PbO2–GN nanocomposite in alkaline medium. Journal of Applied Electrochemistry (2022).
4. Pd/fMC−NiO Synergistic, Promotional Effect and Cooperation Induced Electrocatalysis towards Ethylene Glycol Electrooxidation: Experimental Approach and DFT Calculations. ChemElectroChem (2024).