Sustainable Fe3C/Fe-Nx-C Cathode Catalyst from Biomass for an Oxygen Reduction Reaction in Alkaline Electrolytes and Zinc–Air Battery Application

Inorganics, Год журнала: 2025, Номер 13(5), С. 143 - 143

Опубликована: Апрель 30, 2025

Realistic applications of zinc–air batteries are hindered by the high cost Pt/C cathode catalysts, necessitating search for alternative, sustainable electrocatalysts. In this work, we developed a Fe3C/Fe-Nx-C catalyst from waste coffee biomass an oxygen reduction reaction (ORR) in alkaline electrolytes and battery applications. The was synthesized via mechanochemical synthesis strategy using melamine EDTA–Fe chelate complex, followed pyrolysis at 900 °C. obtained evaluated detailed ORR activity stability. results show that displayed excellent with E1/2 0.93 V vs. RHE, Tafel slope 68 mV dec−1, 3.95 e− transfer O2 molecule, ECSA values. addition, exhibited stability loss 75 10,000 potential cycles, ~14% relative currents chronoamperometric test. When applied as battery, delivered power density 81 mW cm−2 admirable electrochemical under galvanostatic discharge conditions. Furthermore, practical application demonstrated panel LEDs illuminated dual-cell connected series, clearly validating practically catalysts use various energy storage electronic devices.

Язык: Английский

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Cobalt-Decorated Carbonized Wood as an Efficient Electrocatalyst for Water Splitting

Catalysts, Год журнала: 2025, Номер 15(5), С. 503 - 503

Опубликована: Май 21, 2025

The efficient mass transport and enhanced accessibility of active sites are crucial for high-performance electrocatalysts in water splitting. Inspired by the hierarchical structure natural wood, we engineered a monolithic electrocatalyst, cobalt nanoparticles encapsulated nitrogen-doped carbon layers on carbonized wood (Co@NC/CW), carbonizing to create three-dimensional framework with vertically aligned macropores. unique architecture encapsulates within situ-grown graphene wood-derived microchannels, facilitating ultrafast electrolyte infusion anisotropic electron transport. As result, optimized freestanding Co@NC/CW electrode exhibits remarkable bifunctional activity, achieving overpotentials 403 mV 227 oxygen evolution reaction (OER) hydrogen (HER), respectively, at current density 50 mA cm−2. Furthermore, integrated hybrid electrolyzer combining HER OER delivers an impressive A cm−2 cell voltage 1.72 V while maintaining Faradaic efficiency near 99.5% sustaining long-term stability over 120 h continuous operation. also demonstrates performance complete decomposition alkaline seawater, underscoring its potential scalable applications. This catalyst design not only leverages porosity but offers sustainable platform advanced electrochemical systems.

Язык: Английский

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Recent advances in biomass-derived single metal-doped nanostructured carbon materials for electrocatalysts and electrodes for high performance of rechargeable lithium-air batteries

Journal of Power Sources, Год журнала: 2025, Номер 649, С. 237434 - 237434

Опубликована: Май 28, 2025

Язык: Английский

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