Electrocatalytic Oxidation of Biomass-Derived Compounds

Electrocatalytic oxidation of biomass-derived compounds represents a transformative approach to valorise renewable feedstocks into high-value chemicals while reducing energy consumption and greenhouse-gas emissions. By selectively oxidising platform molecules such as alcohols, sugars and polymeric biopolymers at the anode of an electrochemical cell, valuable oxygenates can be produced in place of the oxygen evolution reaction. Progress in catalyst design—encompassing metal hydroxides, phosphides, alloys and nanostructured platforms—has enabled lower overpotentials, higher current densities and enhanced selectivities. Coupling these anodic reactions with cathodic hydrogen generation or paired organic reductions further improves overall energy efficiency. Continuous-flow reactors, defect engineering and interfacial ligand modifications have addressed issues of substrate instability and mass transport, paving the way for scalable, safe and sustainable routes to chemicals such as adipic acid, furandicarboxylic acid and formate.

Research from Nature Portfolio

Recent studies have demonstrated large-scale, continuous electrooxidation of biomass platforms with carbon-loss suppression enabled by tailored reactor design. A nine-module flow system minimises substrate residence time and separates feed streams to achieve high single-pass conversion of glucose to formate and 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) at high concentrations and selectivities, allowing kilogram-scale production. In parallel, electrocatalytic oxidation of cyclohexanone to adipic acid over a surfactant-modified nickel hydroxide catalyst has been shown to boost productivity and Faradaic efficiency threefold by enriching immiscible ketones at the electrode interface. Mechanistic insights into paired electrocatalysis on phosphide heterojunctions have identified hydroxyl radicals from water dissociation as key oxidising species, offering a blueprint for catalyst design and demonstrating solar-cell-driven operation at low voltages with near-quantitative Faradaic yields.

Electrocatalytic Oxidation of Biomass-Derived Compounds publication trend

The graph below shows the total number of articles in electrocatalytic oxidation of biomass-derived compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Electrocatalytic oxidation: An anodic reaction in which a catalyst facilitates the removal of electrons from an organic substrate, converting biomass-derived molecules into oxygenated products.

Overpotential: The extra potential required beyond the thermodynamic voltage to drive an electrochemical reaction at a desired rate, often reduced by optimised catalysts.

Faradaic efficiency: The fraction of total charge that contributes to the desired electrochemical transformation, reflecting selectivity and yield.

Paired electrocatalysis: A configuration in which oxidative and reductive reactions proceed simultaneously in one cell, improving overall energy efficiency and product value.

Non-Faradaic degradation: Undesired chemical transformations of substrates or intermediates in the electrolyte that do not involve charge transfer at the electrode, leading to carbon loss and reduced selectivity.

5-Hydroxymethylfurfural (HMF): A biomass-derived platform molecule obtained from dehydration of sugars, readily oxidised to produce polymers and speciality chemicals such as FDCA.

References

1. Enhancing the Electrocatalytic Oxidation of 5-Hydroxymethylfurfural Through Cascade Structure Tuning for Highly Stable Biomass Upgrading. Nano-Micro Letters (2024).
2. Electrocatalytic synthesis of adipic acid coupled with H2 production enhanced by a ligand modification strategy. Nature Communications (2022).
3. Unraveling the mechanism for paired electrocatalysis of organics with water as a feedstock. Nature Communications (2022).
4. Scalable electrosynthesis of commodity chemicals from biomass by suppressing non-Faradaic transformations. Nature Communications (2023).
5. Stabilization of alkaline 5-HMF electrolytes via Cannizzaro reaction for the electrochemical oxidation to FDCA. Green Chemistry (2023).
6. Defect‐Promoted Ni‐Based Layer Double Hydroxides with Enhanced Deprotonation Capability for Efficient Biomass Electrooxidation. Advanced Materials (2023).