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Facile electrodeposition of V-doped CoP on vertical graphene for efficient alkaline water electrolysis

In this work, we demonstrate a highly enhanced electrocatalytic activity of vanadium-doped CoP (V–CoP), directly grafted on a vertical graphene/carbon cloth electrode (VG/CC) by a facile electrochemical deposition method. Impressively, V–CoP/VG/CC exhibited a superior catalytic activity toward the h...

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Detalles Bibliográficos
Autores principales: Truong, Linh, Roy, Sanjib Baran, Jerng, Sahng-Kyoon, Jeon, Jae Ho, Lee, Sunghun, Chun, Seung-Hyun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9051416/
https://www.ncbi.nlm.nih.gov/pubmed/35492100
http://dx.doi.org/10.1039/d0ra01538e
Descripción
Sumario:In this work, we demonstrate a highly enhanced electrocatalytic activity of vanadium-doped CoP (V–CoP), directly grafted on a vertical graphene/carbon cloth electrode (VG/CC) by a facile electrochemical deposition method. Impressively, V–CoP/VG/CC exhibited a superior catalytic activity toward the hydrogen evolution reaction (HER) in alkaline solution. Compared to CoP/VG/CC, V-doping decreased the overpotential for HER at 10 mA cm(−2) by more than half to 40 mV. The new catalyst even outperformed Pt/C beyond 150 mA cm(−2). The overpotential for OER at 50 mA cm(−2) was merely 314 mV, more than 100 mV lower than that of IrO(2). Moreover, our novel catalyst worked as an excellent bifunctional catalyst with a low cell voltage of 1.69 V to achieve a current density of 50 mA cm(−2). Detailed characterizations revealed that the V-doping in CoP resulted in improved electrical conductivity and increased active sites. Our findings highlight the significant advantage of V doping on the catalytic activities of CoP, already boosted by VG. Furthermore, concurrent doping with the electrodeposition of catalyst offers a new approach for practical water electrolysis.