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PERFORMANCE OPTIMIZATION OF ALKALINE WATER ELECTROLYSIS INTEGRATED WITH PHOTOVOLTAIC SYSTEMS FOR GREEN HYDROGEN PRODUCTION

Field of Science:Renewable Energy, Sustainability and the Environment
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SCIENCE AND INNOVATIVE DEVELOPMENT

SCIENCE AND INNOVATIVE DEVELOPMENT

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This paper presents a comprehensive optimization of the performance of alkaline water electrolysis systems integrated with photovoltaic moduls for sustainable hydrogen production. The research investigates critical operating parameters, including electrolyte concentration (25-30 wt% KOH), temperature (25-80 °C), current density (100-500 mA/cm²), and power management strategies using maximum power point tracking (MPPT). Electrochemical impedance spectroscopy reveals a charge transfer resistance of 0.32 Ω·cm² under optimal conditions (30 wt.% KOH, 60 °C). The optimized system achieves a Faradaic efficiency of 90.9%, an energy efficiency of 55.9%, and an overall solar-to-hydrogen conversion efficiency of 13.5% with MPPT implementation, representing a 20.5% improvement over direct coupling. Long-term stability testing over 1000 hours confirms an electrode corrosion rate below 0.01 mm/year for 316L stainless steel electrodes. An economic analysis demonstrates a levelized cost of hydrogen (LCOH) of USD 1.85/kg for 1 MW-scale systems in the high-irradiation climate of Uzbekistan (2,150 kWh/m²/year), achieving a 26% cost advantage compared to temperate regions. The findings validate the technical feasibility and commercial viability of solar-powered alkaline electrolysis for industrial-scale green hydrogen production under Central Asian conditions. The primary scientific contribution of this research is the first comprehensive optimization study of alkaline water e

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https://eroi.uz/11.94/A026-862965

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