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2026-05-14

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cc-by-nc (c) Zuccante, G. et al., 2026
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/231154

Atomically-dispersed transition metal electrocatalysts supported on lignin-derived carbons for cathodic hydrogen peroxide synthesis using a gas-diffusion electrode

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Recurs relacionat

https://doi.org/10.1016/j.seppur.2026.138480

Resum

Hydrogen peroxide (H2O2) is nowadays a commodity chemical, with a particularly relevant application in wastewater treatment. However, its industrial production is energy demanding, highly polluting and potentially dangerous. Lately, oxygen reduction reaction (ORR) conducted on a gas-diffusion electrode (GDE) has been explored to deploy a more sustainable synthesis route. In this work, a set of lignin-derived carbons, either metal-free or loaded with atomically dispersed transition metals (Fe, Co and Ni), was successfully synthesized for the electrogeneration of H2O2. For some electrocatalysts, the rotating ring-disk electrode (RRDE) analysis showed a peroxide selectivity () over 90% and a number of transferred electrons of ∼2. Accordingly, the type of metal and the carbon porosity had a major influence on the performance of GDEs during bulk electrolysis. In galvanostatic assays conducted in 0.05 M Na2SO4 medium at pH 5.9 and 10 mA cm−2, the carbon obtained from direct lignin pyrolysis at 400 °C outperformed a commercial GDE, showing the highest H2O2 yield (13.8 mM after 360 min), with a maximum current efficiency of 85% and relatively low energy consumption (∼ 8 ). Such optimum performance is related to its optimal porosity and hydrophobicity. Moreover, upon functionalization with Fe, an effective electro-Fenton (EF) catalyst was obtained, allowing a 97% removal of the drug lisinopril using only 0.1 g L−1 of suspended catalyst. This work demonstrates the possibility of producing cost-effective electrocatalysts from waste for H2O2 production and wastewater treatment.

Matèries

Tractament d'aigües residuals, Electrosíntesis de H2O2, Valorització de residus de biomassa

Matèries (anglès)

Advanced wastewater treatment, H2O2 electrosynthesis, Biomass waste valorization

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Col·leccions

Articles publicats en revistes (Ciència dels Materials i Química Física)
Articles publicats en revistes (Institut de Biomedicina (IBUB))

Citació

ZUCCANTE, G., et al. Atomically-dispersed transition metal electrocatalysts supported on lignin-derived carbons for cathodic hydrogen peroxide synthesis using a gas-diffusion electrode. Separation and Purification Technology. 2026. Vol. 401, num. 1-15. ISSN 1383-5866. [consulted: 4 of August of 2026]. Available at: https://hdl.handle.net/2445/231154

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