Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 46, Issue 6, Pages 7309-7319Publisher
WILEY
DOI: 10.1002/er.7638
Keywords
dynamic magnetic field; hydrogen production; water electrolysis
Categories
Funding
- Indonesian Ministry of Research and Higher Education [04/UN10, F07/PN/2020]
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The application of dynamic magnetic field (DMF) in water electrolysis can increase hydrogen production by enhancing water kinetic energy and increasing the chance of ion transfer. Compared to static magnetic field (SMF), DMF weakens covalent bonds and hydrogen bonds to promote hydrogen formation. Additionally, DMF facilitates water splitting by shaking and aligning water molecules, providing energy to the molecules.
Static magnetic field (SMF) application in water electrolysis increases hydrogen production. However, the effect of the dynamic magnetic field (DMF) in water electrolysis is rarely studied. This study utilizes DMF to increase hydrogen production in water electrolysis. DMF was generated by rotating a plate-shaped magnet. As a result, DMF produces 23.1 mL H-2,H- which almost doubled the 12.1 mL H-2 of SMF. DMF increases the chance of hydrogen formation by weakening the covalent bond, hydrogen bond, and increase the ion transfer mobility as a result of additional magnetic field strength. This phenomenon consistent with the Faraday's law where fluctuating magnetic field generates an electromotive force that increases electric current density. The high electric current density alters hydroxide ion mobility as the interchanging magnetic force field by DMF increases the ions collision chance. The additional magnetic force by DMF has aligned more water molecules than DMF. Consequently, more water molecule dipoles are exposed during electrolysis. Hence, DMF eases the water-splitting process by shaking the water molecules, which continuously aligns the dipole and also energizes the water molecules. The energized water with higher kinetic energy is easier to split as the required ionization energy has reduced. This happens as the result of the spin-pair magnetic energy conversion that is stimulated by external magnetic field. The increase in rotational speed of magnetic rods does not significantly increase hydrogen evolution reaction and lower the electrolysis efficiency. This indicates the presence of DMF is more important for water electrolysis performance than the rotational speed of DMF. Conclusively, DMF enhances hydrogen evolution reaction by an increase in water kinetic energy and increase in ion transfer chance through dipole exposition.
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