Free-Standing Carbon Nanofiber Films with Supported Cobalt Phosphide Nanoparticles as Cathodes for Hydrogen Evolution Reaction in a Microbial Electrolysis Cell
Pérez-Pi, Gerard (Leitat Technological Centre)
Luque-Rueda, Jorge (Leitat Technological Centre)
Bosch Jiménez, Pau (Leitat Technological Centre)
Borràs Camps, Eduard (Leitat Technological Centre)
Martínez-Crespiera, Sandra (Leitat Technological Centre)

Data:	2024
Resum:	High-performance and cost-efficient electrocatalysts and electrodes are needed to improve the hydrogen evolution reaction (HER) for the hydrogen (H2) generation in electrolysers, including microbial electrolysis cells (MECs). In this study, free-standing carbon nanofiber (CNF) films with supported cobalt phosphide nanoparticles have been prepared by means of an up-scalable electrospinning process followed by a thermal treatment under controlled conditions. The produced cobalt phosphide-supported CNF films show to be nanoporous (pore volume up to 0. 33 cm3 g-1) with a high surface area (up to 502 m2 g-1) and with a suitable catalyst mass loading (up to 0. 49 mg cm-2). Values of overpotential less than 140 mV at 10 mA cm-2 have been reached for the HER in alkaline media (1 M KOH), which demonstrates a high activity. The high electrical conductivity together with the mechanical stability of the free-standing CNF films allowed their direct use as cathodes in a MEC reactor, resulting in an exceptionally low voltage operation (0. 75 V) with a current density demand of 5. 4 A m-2. This enabled the production of H2 with an energy consumption below 30 kWh kg-1 H2, which is highly efficient.
Ajuts:	European Commission 101000441
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Electrospinning; ; Electrocatalyst; ; Cobalt phosphide; ; Carbon nanofiber (CNF); ; Nanoparticles; ; Free-standing films; ; Cathodes; ; Hydrogen evolution reaction (HER); ; Microbial electrolysis cells (MECs)
Publicat a:	Nanomaterials, Vol 14, Issue 22 (November 2024) , art. 1849, ISSN 2079-4991

DOI: 10.3390/nano14221849
PMID: 39591089

17 p, 5.8 MB

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