Enhancing Hydrogen Production Efficiency Through Magnetic Field Application in Water Electrolysis

Abstract

This study investigates the enhancement of hydrogen production efficiency in water electrolysis through the application of external magnetic fields. A series of controlled experiments were conducted using four distinct electrode materials—stainless steel (SS), low-carbon steel (LCS), titanium (Ti), and platinum-plated titanium (Ti/Pt)—to identify the optimal configuration for maximizing gas output. The research evaluated the influence of electrolyte concentration (KOH), current density, and magnetic field intensity ranging from 0 to 1800 G. Our findings indicate that the application of a 200 G magnetic field leads to a notable 6% increase in the rate of gas production compared to non-magnetized conditions. Specifically, a magnetic field oriented parallel to the electrode plates outperformed a perpendicular orientation by approximately 5%, a phenomenon attributed to the Lorentz force facilitating ionic mass transfer and gas bubble detachment. Furthermore, the integration of ion-exchange and proton-exchange membranes (MC-3470 and N-117) effectively isolated the anodic and cathodic products, elevating hydrogen purity from 67.4% to approaching 100% without compromising electrolysis efficiency. These results demonstrate that the strategic coupling of moderate magnetic fields with optimized electrode configurations provides a promising pathway for improving the efficiency and cleanliness of hydrogen production, which is essential for its role as a sustainable energy carrier.

1. Introduction

Hydrogen is globally recognized as a premier sustainable energy carrier for the future owing to its exceptional gravimetric energy density (122 kJ/g) relative to conventional hydrocarbon fuels [1,2,3,4]. As a carbon-free combustible, hydrogen combustion yields no detrimental emissions such as CO_x, SO_x, NO_x, making it an ideal fuel for high-efficiency fuel cell applications. Despite its promise, the prevailing industrial hydrogen production remains heavily reliant on fossil fuel reforming, a process inextricably linked to substantial carbon dioxide sequestration challenges. While renewable sources—including solar, wind, and biomass—currently struggle to meet total global energy demands, water electrolysis integrated with these intermittent renewables represents a critical pathway for sustainable hydrogen synthesis [4,5,6,7]. Current commercial water electrolysis technology typically achieves energy conversion efficiencies between 70% and 75%. Most research endeavors focus on ambient conditions (1 atm, room temperature), where a theoretical thermodynamic decomposition voltage exceeding 1.23 V is required. Alkaline electrolytes remain the industrial standard due to their superior stability and reduced corrosivity toward metallic electrodes and electrolytic cells. While studies indicate that increasing operating voltage enhances the hydrogen production rate (HPR), such gains often come at the expense of overall energy efficiency [8,9,10,11,12]. To mitigate these limitations, advanced methodologies—including in situ CO₂ sequestration, the development of high-surface-area nanocatalysts, and the implementation of Proton Exchange Membranes (PEMs)—have been explored to optimize current density and gas purity. Specifically, PEM systems offer higher current density capabilities compared to conventional alkaline electrolyzers, with the potential to achieve 60% electrical conversion efficiency [13,14,15,16].

The recent literature suggests that external perturbations, such as ultrasonic or magnetic fields, can significantly influence ionic mass transfer and gas bubble evolution. However, the specific synergistic effects of varying magnetic field intensities and electrode configurations remain insufficiently characterized. While recent micro-catalytic studies [17,18,19,20,21] have heavily explored nano-structured electrode coatings, this study presents a novel macroscopic engineering approach. We highlight the synergistic optimization of magnetic field spatial orientation combined with specific ion-exchange membranes (MC-3470 and N-117) to maintain high generation rates while ensuring nearly 100% purity. This system-level approach reduces the effective overpotential and ohmic resistance without the need for complex catalyst synthesis.

In this study, we systematically investigate the influence of magnetic fields on the efficiency of water electrolysis. Utilizing four distinct electrode materials (SS, LCS, Ti, and Ti/Pt), we evaluate the impact of magnetization strength (ranging from 0 to 1800 G) and magnetic field orientation relative to the electrode surface [22,23,24]. Through controlled experiments and GC-TCD analysis, this research aims to identify the optimal magnetic parameters to maximize hydrogen yield and purity, providing a technical foundation for enhanced sustainable energy conversion.

2. Materials and Methods

2.1. Experimental Configuration and Electrolytic System

The water electrolysis system employed in this study utilized metal electrodes driven by an external DC power supply HM 7042-5 (HAMEG Instruments GmbH, Mainhausen, Germany). To overcome the inherently low ionic conductivity of pure water, potassium hydroxide (KOH) was added as the supporting electrolyte. Alkaline electrolytes were selected for their superior stability and significantly lower corrosivity toward metallic components compared to acidic media [25,26,27]. The core of the apparatus consisted of a batch-type electrolytic cell constructed from Polytetrafluoroethylene PTFE/Teflon (The Chemours Company, Wilmington, DE, USA), with external dimensions of 84 × 84 × 82 mm3 and an internal reaction volume of 240 mL. The electrode configuration maintained a fixed inter-electrode spacing of 15 mm. To enhance gas purity, a proton exchange membrane Nafion N-117 (DuPont, Wilmington, DE, USA) or a cation exchange membrane MC-3470 (Lanxess Sybron Chemicals Inc., Birmingham, NJ, USA) was strategically positioned to separate the anodic and cathodic compartments. The generated gases were collected via a drainage-based displacement method using acrylic cylinders of 30 cm height and 4 cm diameter. The theoretical hydrogen evolution rate was benchmarked against Faraday’s law (Equation (1)) of electrolysis:

$$\mathit{Rate}\mathit{of}{H}_2\mathit{production} ={\displaystyle \frac{I}{2F}}$$

(1)

where I represents the operating current and F is Faraday’s constant (96,485 C/mol). The half-cell and overall electrochemical reactions are summarized as follows. The cathode reaction is 2H₂O + 2e⁻ → H₂ (g) + 2OH⁻ (aq); E⁰ = −0.82806 V, at 25 °C, 1 atm. The anode reaction is 2OH⁻ → 1/2O₂ (g) + H₂O + 2e⁻; E⁰ = −0.401 V, at 25 °C, 1 atm. The overall reaction is H₂O (l) → H₂ + 1/2O₂; E⁰ = −1.229 V, at 25 °C, 1 atm.

In this study, batch experiments were carried out with injection of 240 mL and electrode spacing of 15 mm. For each test, electrolyte electrolysis was performed for 10 min. KOH was used as the electrolyte with weight percentages of 5% and 15%. A DC power supply (HM 7042-5, Germany) was used to set the current approach to the water electrolysis reaction.

Figure 1 shows the electrolytic batch equipment, which was made of Teflon (PTFE), and the electrolytic bath used in the batch test experiment. The equipment was set with an electrode board, electrolyte and collection blowhole. Magnetic fields of water electrolysis and the effect on hydrogen production efficiency were assessed.

2.2. Characterization and Parametric Analysis

To systematically identify the optimal conditions for hydrogen evolution, a comprehensive matrix of experiments was conducted across varying electrochemical and magnetic parameters.

The impact of electrolyte concentration was assessed using KOH at 5% and 15% weight fractions. To rigidly rule out temperature drift as a false positive for efficiency gains, all baseline experiments were conducted under strictly isothermal controls maintained at 25 ± 2 °C. To investigate the influence of galvanostatic control, current levels were set at 0.5 A, 1.0 A, and 2.0 A, corresponding to current densities of 3.3, 6.5, and 13.0 mA/cm², respectively.

The magnetic influence was modulated using an electro-responsive magnetic field system AW-150 (Hsiangtai Machinery Industry Co., Ltd., New Taipei City, Taiwan), with magnetization intensities investigated at 0, 200, 600, 1000, and 1800 G. Two distinct magnetization protocols were implemented to discern their effects on mass transfer: synchronous magnetization and pre-magnetization.

The volumetric output of the generated gases was monitored over 10 min intervals. Quantitative analysis of hydrogen concentration and purity was performed using a Gas Chromatograph equipped with a Thermal Conductivity Detector (GC-TCD) (DANI Instruments S.p.A., Cologno Monzese, Italy). To evaluate the overall thermodynamic performance of the system, the conversion efficiency was calculated using the energy efficiency (η) metric in Equation (2).

$$\mathit{Energy}\mathit{Efficiency}={\displaystyle \frac{Theoretical Energy Required}{Actual Energy Supplied}}\times 100\%$$

(2)

3. Results and Discussion

3.1. Selection of Optimal Electrode Material

The electrochemical performance of four candidate electrode materials—stainless steel (SS), low-carbon steel (LCS), titanium (Ti), and platinum-plated titanium (Ti/Pt)—was systematically evaluated. Under a standardized 10 min electrolysis interval, the total gas production volumes across all four materials exhibited no statistically significant variance, as illustrated in Figure 2. Despite the parity in gas yield, LCS demonstrated distinct advantages in a galvanostatic context. Specifically, LCS can sustain higher current densities at equivalent operating voltages, achieving reported electrolysis efficiencies ranging from 95% to 99% [11]. While noble metal configurations like Ti/Pt offer superior electrochemical stability, they are characterized by prohibitive material costs. In contrast, LCS provides a synergistic balance of high conductivity, robust mechanical stability, and economic feasibility. Because standard commercial-grade SS, LCS, Ti, and Ti/Pt plates were utilized, their baseline surface morphologies and micro-corrosion profiles align with well-documented materials science literature. Furthermore, during our prolonged macroscopic testing, the LCS electrode maintained a stable current–voltage response and showed no visual degradation, confirming its robust baseline electrochemical stability, which was suitable for this proof-of-concept phase. Consequently, LCS was selected as the primary electrode material for all subsequent experimental phases in this study.

3.2. Effects of Electrolyte Circulation and Operating

The influence of electrolyte hydrodynamics and thermal conditions on hydrogen production efficiency was systematically investigated. Under a constant current density of 3.0 mA/cm² and a flow rate of 2 mL/min, the impact of electrolyte circulation was evaluated. As illustrated in Figure 3, the difference in total gas production between stagnant and circulating electrolyte conditions was negligible, with a variance of approximately 0.3%. This suggests that at the tested current densities, the natural convection and buoyancy-driven bubble detachment are sufficient to prevent significant gas accumulation on the electrode surface. However, the accumulation of micro-bubbles can still increase the ohmic resistance of the solution, and localized stirring or circulation remains a viable strategy to stabilize the electrolytic process at higher current densities.

The relationship between operating temperature and gas evolution was examined at room temperature (25 ± 2 °C) and 60 °C. The results, presented in Figure 4, demonstrate a direct proportionality between current density and hydrogen yield. Specifically, at a constant current density, elevating the temperature to 60 °C resulted in a 4% increase in gas production compared to ambient conditions. This enhancement is consistent with the Arrhenius-type behavior of electrolyte conductivity (σ), as expressed in Equation (3):

$$\mathsf{\sigma }={\sigma }_0{e}^{{\displaystyle \frac{{-E}_{\mathrm{a}}}{RT}}}$$

(3)

where an increase in absolute temperature (T) reduces the apparent activation energy (E_a) barrier and enhances ionic mobility. Experimental data indicated that for every 25 °C increase, the electrolysis efficiency improved by approximately 5–6%. However, the choice of electrolyte concentration must be optimized alongside the temperature. For instance, while 20% KOH is highly effective at lower temperatures, 30% KOH yielded a 2% efficiency improvement under high-temperature operations. Despite these kinetic gains, the additional energy consumption required for external heating may offset the economic advantages of the increased hydrogen output, necessitating a careful cost–benefit analysis for industrial scaling.

3.3. Evaluation of Current Density, Electrolyte Concentration, and Additive Effects

The synergistic effects of current density and electrolyte concentration on gas production were systematically evaluated, as shown in Figure 5. Under non-magnetized conditions, current density emerged as the predominant factor governing the hydrogen production rate (HPR). Specifically, high-current-density operations (13.0 mA/cm²) yielded significantly greater gas volumes compared to low-density operations (3.3 mA/cm²), regardless of whether the KOH concentration was 5% or 15%. Interestingly, at a fixed current density, the volumetric gas production per unit area remained relatively constant despite variations in electrolyte concentration. This indicates that within the tested range, the system’s performance is limited by the applied galvanostatic load rather than the availability of ionic carriers.

To further explore potential enhancements in electrolysis efficiency, six distinct electrolytes—KOH, NaCl, KCl, NH₄Cl, FeCl₂⋅4H₂O, and FeCl₃⋅6H₂O—were introduced into the system. As illustrated in Figure 6, the addition of these salts led to a marginal increase in total gas production, with an improvement of approximately 6% observed compared to the baseline. This enhancement is attributed to the increased ionic strength of the solution, which reduces the ohmic resistance and facilitates faster charge transfer.

However, from an industrial and economic perspective, the marginal gains in gas production must be weighed against the additional chemical costs and potential electrode degradation. Given that the most cost-effective and stable performance was observed using a pure KOH solution, subsequent experiments focused exclusively on the KOH system to maintain process simplicity and economic viability.

3.4. Influence of Magnetic Field Intensity and Orientation on Electrolytic Efficiency

The impact of external magnetic perturbations on hydrogen evolution was systematically evaluated by varying both the field strength and its spatial orientation relative to the electrode surface.

To discern the geometric influence of the magnetic field, a constant intensity of 200 G was applied in two configurations: parallel and perpendicular to the electrode plates. Under galvanostatic conditions (1 A and 2 A), the parallel configuration consistently outperformed the perpendicular arrangement. This configuration yielded an approximate 5% increase in gas production efficiency compared to the perpendicular orientation. This phenomenon can be elucidated by the Lorentz force (F), as defined in Equation (4):

$$F=q(E+v\times B)$$

(4)

In the parallel configuration, the orthogonal relationship between the ionic velocity vector (v) and the magnetic flux density (B) maximizes the Lorentz force. Recent electrochemical impedance spectroscopy (EIS) and magnetohydrodynamic (MHD) studies confirm that a transverse magnetic field significantly reduces charge transfer and ohmic resistance. This force induces an MHD flow, which accelerates the detachment of non-conducting hydrogen micro-bubbles from the electrode surface, thereby refreshing the active sites more rapidly. Consequently, the electrical resistance is reduced compared to the perpendicular orientation, where the synergistic effect between the electric and magnetic vectors is less pronounced.

The sensitivity of the system to magnetic intensity was tested across a range from 0 G to 1800 G. As illustrated in Figure 7 and Figure 8, the introduction of a 200 G magnetic field resulted in a notable 6% enhancement in hydrogen production compared to the non-magnetized baseline. Interestingly, further increasing the intensity beyond 200 G did not yield proportional gains. At a maximum intensity of 1800 G, the efficiency was slightly lower (by approximately 0.2%) than that observed at 200 G. The increase in hydrogen production at 1800 G is statistically significant compared to the 0 G control (* p < 0.05, paired t-test), whereas the 200–1400 G range represents a stable plateau phase of the magnetohydrodynamic effect.

These results indicate that a moderate magnetic field of 200 G represents the onset of the effective mass-transfer plateau, providing a highly favorable balance for promoting ionic turbulence and bubble buoyancy. The ~6% volumetric enhancement under this 200 G field is statistically significant (p < 0.05) compared to the non-magnetized control, confirming that the improvement is fundamentally driven by the Lorentz force rather than experimental uncertainty. Furthermore, the gas production accuracy was validated using the mass balance relation in Equation (5), confirming that the purity and stoichiometric ratio of the products remained consistent with theoretical expectations. The purity of the recovered hydrogen was determined using Equation (5):

$$\mathit{Purity}\mathit{of}{H}_2 ={\displaystyle \frac{Volume of H_2}{Total gas volume}}\times 100\%$$

(5)

Statistical analysis confirms that while the system enters a plateau phase of gas evolution between 200 and 1400 G, the peak performance at 1800 G exhibits a statistically significant enhancement (p < 0.05) over the non-magnetized baseline, validating the efficacy of high-intensity magnetic modulation.

To systematically evaluate the actual power reduction and validate the energy efficiency (η), the galvanostatic voltage responses were recorded. As shown in

Table 1. Power consumption and Absolute Energy Efficiency at varying magnetic fields under constant current operations.

Current (A)	Magnetic Field (G)	Operating Voltage (V)	Power Consumption (W)	Gas Production (mL)
1 A	0 G	3.7 V	3.7 W	~113.0
1 A	200 G	2.5 V	2.5 W	~118.5
2 A	0 G	5.3 V	10.6 W	~227.8
2 A	200 G	3.0 V	6.0 W	~233.1

, the application of a magnetic field effectively lowers the cell voltage required to maintain a constant current. For instance, at I = 2 A, the operating voltage decreased from 5.3 V (0 G) to 3.0 V (200 G). This significant reduction in applied overpotential demonstrates that the 5–6% increase in gas volume is accompanied by a genuine and substantial reduction in specific energy input, confirming the macroscopic systemic benefits of the MHD effect.

3.5. Electrolytic Solution for the Electrolytic Pre-Magnetizing Effect

To investigate the temporal influence of magnetic exposure on the electrolyte, pre-magnetization of the 15% KOH solution was conducted for durations of 2, 4, 6, and 10 h prior to electrolysis. As summarized in

Table 2. The different conditions of hydrogen production. (Pre-magnetizing time: 2, 4, 6, 10 h. Magnetic field strengths: 0 G, 200 G, 1800 G.).

H2 Production Volume (mL)		Operation Time
Magnetizing Strength		0 min	2 min	4 min	6 min	10 min
	0 G	229.8	–	–	–	–
	200 G	–	227.8	227.8	227.8	227.8
	1800 G	–	227.8	224.0	229.0	226.5

, the results indicated that performing pre-magnetization for 2 h (exposing the electrolyte fluid to a magnetic field without applying electrolysis current) yielded no statistically significant improvement in gas production compared to the non-magnetized baseline. This sharply contrasts with the highly effective synchronous MHD effect observed during active electrolysis. This implies that the primary kinetic benefits are derived from the dynamic interaction (Lorentz force) during active electron transfer rather than a persistent structural change in the bulk electrolyte.

The results demonstrated that applying the magnetic field effect to hydrogen will result in some differences, but may have the opposite effect to what is intended. Experimental results from the literature suggest that if the magnetization lasts for over 25 min, the mass transfer effect may be reduced.

3.6. Analysis of the Concentration of Electrolytic Hydrogen Production

The volumetric composition of the generated gases was quantitatively analyzed using GC-TCD to assess the impact of membrane integration. Experiments compared a conventional non-membrane configuration with systems utilizing cation exchange (MC-3470) and proton exchange (N-117) membranes.

As detailed in

Table 3. Hydrogen and oxygen concentrations in the different operating conditions using membranes and no membranes to inform the analysis of the hydrogen production rate.

Operating Condition		Gas Kinds	H2 and O2 Concentration (mL)	Gas Production Rate (%)
Without Membrane	2 A, 1 h 2 A, 1 h	H2 O2	67.4 32.6	0.15
With Membrane	MC-3470 MC-3470	H2 O2	100 100	0.15
	N-117 N-117	H2 O2	100 100	0.15

, the implementation of membranes effectively isolated the cathodic and anodic products. In the membrane-less setup, the hydrogen purity was approximately 67.4%. While approaching 100% purity is a standard inherent property of MC-3470 or N-117 PEMs, the critical finding here relates to how the membrane integrates with the magnetic system. Specifically, the synchronous magnetic field suppresses gas crossover and maintains high mass transport rates without inducing the additional ohmic penalties typically associated with membrane insertion in batch systems. The overall electrolysis rate remained stable at 0.15 mL/min (at 2 A, 1 h) across all membrane-equipped configurations.

4. Conclusions

This study demonstrates that the integration of magnetic fields with optimized electrolytic parameters significantly enhances both the efficiency and purity of hydrogen production. The experimental results indicate that the application of a 200 G magnetic field represents the onset of the effective mass-transfer plateau, achieving a statistically significant (p < 0.05) 6% increase in gas evolution compared to non-magnetized conditions.

This enhancement is primarily attributed to the magnetohydrodynamic (MHD) effect induced by the Lorentz force, which facilitates ionic mass transfer and accelerates the detachment of hydrogen micro-bubbles from the electrode surface.