Effects of magnetic field and pulse potential on hydrogen production via water electrolysis

Abstract

SUMMARY This experiment uses nickel electrodes and adds pulse potential and magnetic force when producing hydrogen via water electrolysis and explores how related parameters are affected by magnetohydrodynamics and pulse potential. Experiments showed that the Lorentz force of the magnetic field changes the direction of convective flow of the electrolyte, which affects the flow of bubbles during electrolysis. Adding a magnetic field increases the rate of current density by roughly 15% under a normal temperature, a distance of 2 mm between electrodes and a potential of 4 V. Pulse potential instantaneously increases current and accelerates both the movement of bubbles from the electrode surface and the mass transfer rate in the electrolyte, which lowers electrochemical polarization in the diffussion layer and further increases hydrogen production efficiency. When the duty cycle is 10% and the pulse on‐time is 10 ms, almost 88% of overall power is converted, and current density increases by 680 mA/cm2, which is an increase of roughly 38%. Generally, pulse potential and magnetic field effects enhance each other when added under suitable pulse potential and basic potential. Copyright © 2013 John Wiley & Sons, Ltd.

Yolk–Shell Fe/Fe4N@Pd/C Magnetic Nanocomposite as an Efficient Recyclable ORR Electrocatalyst and SERS Substrate

“…The magnetic noble metal nanocomposite system has been established to study the role of Lorentz force in electrocatalysis according to previous literatures . Lorentz force was found to make a difference to the redox process of water electrolysis, tuning the electron transfer rate . Inspired from aforementioned works, we designed rationally a multifunctional nanocomposite used as ORR electrocatalyst, possessing magnetic core and defective carbon shell with Pd NPs embedded.…”

Improving PEM water electrolyser’s performance by magnetic field application

“…Moreover, it is found that the magnetic field has an effect on the bubble dimensions. Lin et al [35] used a Charge Coupled Device (CCD) camera to observe Lorentz Force effect on the oxygen and hydrogen evolution reactions at the electrodes. They concluded that applying a magnetic field results in smaller bubble diameter and found that moving low diameter bubbles off the electrode surface is easier than larger bubbles.…”

“…Here, the ferromagnetic nickel electrodes obtained 14.6 % current density improvement. In another study, Lin et al [35] reported that both the magnetic field and the pulse potential remarkably increased hydrogen production efficiency. According to their findings, by the help of pulse potential, bubble removal acceleration and mass transfer ratio is enhanced.…”

Process intensification: An electrochemical perspective

“…Lin investigated the effect of a magnetic field and pulsed potential on hydrogen evolution using nickel electrodes [104]. They showed that the Lorentz force of the magnetic field changes the direction of convective flow of the electrolyte and, that generally a pulsed potential and magnetic field simultaneously enhance hydrogen evolution performance.…”