Article 2025 · 1 atıf

Low-cost transition metals (Fe, Ni, Co) on carbon aerogel for water electrolysis and supercapacitor applications

Mladenovic, Dusan, Martins, Marta, Samanci, Meryem, Charneca, Miguel, Paul, Anup, Santos, Diogo M. F., Bayrakceken, Ayse, Sljukic, Biljana

Özet

Cost-effective transition metals (TM = Fe, Ni, Co) were immobilized on carbon aerogel (CA) using microwave irradiation, followed by nitrogen doping into one catalyst series through heat treatment. The physical characterization of the synthesized catalysts included N2 sorption, inductively coupled plasma-mass spectrometry, Xray diffraction analysis, transmission electron microscopy, Raman spectroscopy, FTIR spectroscopy, and X-ray photoelectron spectroscopy. Co/CA displayed the best performance for oxygen evolution reaction (OER) electrocatalysis in alkaline water electrolysis, followed by Ni/CA. Co/CA exhibited a small Tafel slope of 110 mV dec-1 and required an overpotential of just 276 mV to reach 10 mA cm-2, lower than that of the commercial IrO2 electrocatalyst. Additionally, Co/CA and Ni/CA demonstrated excellent long-term stability during OER, with activity increasing over time. Capacitance measurements also showed the potential of TM/CA materials as supercapacitor electrodes. Fe/CA achieved the highest performance, with a specific capacitance of 322 F g-1 at a moderate current of 1 A g-1. It retained up to 96 % of its capacitance over 1000 cycles, indicating excellent stability.

Anahtar Kelimeler

Transition metal Carbon aerogel Nitrogen-doped catalyst Water electrolysis Supercapacitors IN-SITU SYNTHESIS DOPED CARBON AT-C ELECTROCHEMICAL PROPERTIES OXYGEN REDUCTION NANOPARTICLES CATALYST ELECTROCATALYSTS HYDROGENATION DEGRADATION

WoS Kategorileri

Electrochemistry

Sürdürülebilir Kalkınma Amaçları

Erişilebilir ve Temiz Enerji

Künye

Dergi: ELECTROCHIMICA ACTA
Yıl: 2025
Cilt: 540
ISSN: 0013-4686
eISSN: 1873-3859
DOI: 10.1016/j.electacta.2025.147226
WoS UID: WOS:001564216900007

Yayını aç (DOI)