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Design of single- and bimetallic Co–Dy/Ho decorated MXene/CNT composites for enhanced electrocatalytic performance in fuel cells and water splitting
Hosseini, S.S. Bakhtavar, S. Mehrpooya, M. Ganjali, M.R.
Hosseini, S.S.
Bakhtavar, S.
Mehrpooya, M.
Ganjali, M.R.
Publication Date
2026-04-09
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© 2026 The Author(s). This is the Author Accepted Manuscript of the article distributed under the Creative Commons CC-BY license (https://creativecommons.org/licenses/by/4.0) in accordance with the University of Bradford Rights Retention Policy.
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openAccess
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2026-03-02
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hosseini_et_al_2026
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Abstract
Electrocatalysts are indispensable for accelerating the kinetics of oxygen evolution reaction (OER), oxygen reduction reactions (ORR) and hydrogen evolution reactions, in several energy conversion and storage technologies, including fuel cells, water electrolysis and metal-air batteries. The quest for more cost-effective catalysts has been stimulated by the inadequate availability and high cost of precious noble metals utilized in ORR, OER, and HER. Comparatively, non-precious metals are promising alternatives as they have exhibited a similar activity for a several electrochemical reactions. This study aims to synthesize a hybrid nanocomposite, consisted of non-precious single and double metal Co–Ho/Dy decorated on MXene/CNT composite as substrate; as well electrochemically assess its performance in ORR, OER, and HER. The synthesized catalysts are scrutinized by several characterization techniques. Benefiting from the synergistic effect of Co and Ho/Dy metals, combined with the excellent conductivity of CNTs and the large active surface area of MXene, the dual-metal catalysts showed significantly enhanced catalytic activity. In particular, Dy–Co#CNT/MXene owned an onset potential of 0.94 V vs RHE for ORR, and an overpotential of 299 mV at 10 mA cm−2 for OER, surpassing those of single-metal systems. Moreover, Dy–Co#CNT/MXene also exhibited a low overpotential of 250 mV at −10 mA cm−2 for HER, with enhanced kinetics and stability. All these findings shed light on the promise of such dual-metal decorated MXene/CNT composites as low-cost, high-performance multifunctional electrocatalysts for sustainable energy technologies.
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Accepted manuscript
Citation
Hosseini SS, Bakhtavar S, Mehrpooya M et al (2026) Design of single- and bimetallic Co–Dy/Ho decorated MXene/CNT composites for enhanced electrocatalytic performance in fuel cells and water splitting. International Journal of Hydrogen Energy. 224: 154340.
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Article