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Low-cost transition metals (Fe, Ni, Co) on carbon aerogel for water electrolysis and supercapacitor applications
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Orientador(es)
Resumo(s)
Abstract
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, X-ray 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.
Descrição
The authors would like to thank the Ministry of Science, Technological Development and Innovation of the Republic of Serbia (contract no. 451–03–136/2025–03/200146 and 451–03–137/2025–03/200146), as well as Fundação para a Ciência e a Tecnologia, Portugal, for funding a Principal Researcher contract (2023.09426.CEECIND, doi:10.54499/2023.09426.CEECIND/CP2830/CT0021) in the scope of the Individual Call to Scientific Employment Stimulus - 6th Edition (D.M.F.S).
Palavras-chave
Transition metal Carbon aerogel Nitrogen-doped catalyst Water electrolysis Supercapacitors 2023.09426.CEECIND
Contexto Educativo
Citação
Mladenović, D., Martins, M., Samanci, M., Charneca, M., Paul, A., Santos, D. M. F., Bayrakçeken, A., & Ślijukić, B. (2025). Low-cost transition metals (Fe, Ni, Co) on carbon aerogel for water electrolysis and supercapacitor applications. Electrochimica Acta, 540, 147226, 1-15. https://doi.org/10.1016/j.electacta.2025.147226
Editora
Elsevier