Magnetic field-enhanced hydrogen electrocatalysis : Unveiling the role of electrolyte concentration
Eiler, Konrad (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)

Data:	2025
Resum:	The hydrogen evolution reaction at Ni foam electrodes is enhanced by magnetic fields of up to 12 kOe applied perpendicular to the electric field. While in 1 M KOH, the beneficial change in overpotential at an applied field is on the order of 10 mV, the effect increases drastically when the concentration of OH is reduced to 0. 1 M and 0. 01 M, respectively, leading to a change in overpotential of up to 200 mV at the lowest concentration of OH, making the reaction significantly more energy-efficient. The addition of KCl as a supporting electrolyte effectively suppresses adverse effects originating from the low conductivity of 0. 01 M KOH while preserving the advantageous effects of the magnetic field. Finally, the effects are studied in neutral 1 M KCl, likewise leading to an improvement in HER of up to 200 mV in overpotential, and in filtered seawater, where the overpotential improves by 28 mV when applying 12 kOe. The effects of magnetic fields on HER are shown to be reversible, and scale with the magnitude of the field. In addition to chronopotentiometry at -10 mA where magnetic field pulses generate a pulse in the HER overpotential, measurements are complemented by linear sweep voltammetry and electrochemical impedance spectroscopy.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00651 Agencia Estatal de Investigación PID2020-116844RB-C21
Nota:	Altres ajuts: acords transformatius de la UAB
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, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Hydrogen evolution reaction ; Magneto-electrocatalysis ; Seawater catalysis ; Water splitting ; Magnetic gradient force
Publicat a:	International journal of hydrogen energy, Vol. 162 (August 2025) , art. 150601, ISSN 1879-3487

DOI: 10.1016/j.ijhydene.2025.150601

9 p, 3.6 MB

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