Electrochemical Water Oxidation for Hydrogen Peroxide Production

Electrochemical water oxidation for hydrogen peroxide production is emerging as a sustainable alternative to conventional methods, bypassing the need for hydrogen gas and anthraquinone cycles. By steering water oxidation through a two-electron pathway at the anode, H2O2 can be generated directly from water using renewable electricity. Key challenges include suppressing the competing four-electron oxygen evolution reaction, minimising overpotentials that drive peroxide decomposition and ensuring catalyst durability under oxidising conditions. Advances in catalyst design—ranging from tailored perovskites and dual‐site oxides to surface‐confined intermediates—combined with optimised electrolytes and reactor designs, have realised faradaic efficiencies above 80% and current densities at or exceeding 1 A cm–2, pointing towards decentralised and scalable on‐demand H2O2 synthesis.

Research from Nature Portfolio

Recent studies have demonstrated that CO2-derived carbonate mediators can switch the water oxidation pathway from oxygen to hydrogen peroxide by forming carbonate radicals and percarbonate intermediates, achieving selectivity up to 87% and partial currents approaching 1.3 A cm–2. The identification of LaAlO3 as an efficient perovskite catalyst, through density functional theory screening and experimental validation, yielded low overpotentials (≈510 mV at 10 mA cm–2) and maintained high faradaic efficiency with minimal performance loss. Concurrently, zinc gallium oxide anodes with dual active sites have been shown to stabilise surface peroxy species on Ga–Ga sites, delivering faradaic efficiencies near 82% at 2.3 V versus RHE while resisting peroxide degradation.

Electrochemical Water Oxidation for Hydrogen Peroxide Production publication trend

The graph below shows the total number of articles in electrochemical water oxidation for hydrogen peroxide production across all publications each year (not limited to Nature Index journals).

Technical terms

Faradaic efficiency: the proportion of electrical charge that yields the desired chemical product.

Overpotential: the additional voltage required to drive an electrochemical reaction beyond its thermodynamic potential.

Two-electron pathway: an oxidation mechanism where water is converted to hydrogen peroxide rather than oxygen.

Perovskite: an oxide material with a specific crystal structure (ABO3) often used in catalytic applications.

Current density: the electric current per unit area of an electrode, indicating reaction rate.

Photoanode: a light-absorbing electrode that drives oxidation reactions under illumination.

References

1. CO2/carbonate-mediated electrochemical water oxidation to hydrogen peroxide. Nature Communications (2022).
2. Discovery of LaAlO3 as an efficient catalyst for two-electron water electrolysis towards hydrogen peroxide. Nature Communications (2022).
3. Electrochemical generation of hydrogen peroxide from a zinc gallium oxide anode with dual active sites. Nature Communications (2023).
4. Selective Electrochemical Oxidation of H2O to H2O2 Using Boron-Doped Diamond: An Experimental and Techno-Economic Evaluation. ACS Sustainable Chemistry & Engineering (2021).
5. Anodic generation of hydrogen peroxide in continuous flow. Green Chemistry (2022).
6. Tailored BiVO4 Photoanode Hydrophobic Microenvironment Enables Water Oxidative H2O2 Accumulation. Advanced Science (2023).