COMPREHENSIVE STUDY OF ELECTROLYTE TYPE, ELECTRODE MATERIAL, AND SYSTEM EFFICIENCY IN SOLAR-POWERED ALKALINE WATER ELECTROLYSIS FOR HYDROGEN PRODUCTION
DOI:
https://doi.org/10.37547/Keywords:
alkaline electrolysis, KOH, NaOH, electrode material, Ni-Mo alloy, NiFe oxide, MPPT, solar energy, hydrogen production, efficiency.Abstract
This paper presents the combined results of three interrelated studies: (1) the effect of electrolyte type — KOH, NaOH, and K₂CO₃ — on hydrogen production in an alkaline electrolyzer; (2) the effect of electrode material — 316L stainless steel, pure Ni, Ni-Mo alloy, NiFe oxide, and Ni-Mo/NiFe composite — on electrochemical efficiency; and (3) an overall system efficiency analysis of a photovoltaic (PV) array integrated with an alkaline electrolyzer via an MPPT controller. Experimental results show that 30% KOH provides the highest ionic conductivity (620 mS/cm), while the Ni-Mo/NiFe composite electrode achieves the lowest overpotential. Combined with an MPPT controller, a 5 kW PV system can produce 160–180 kg of green hydrogen per year under Andijan, Uzbekistan climatic conditions.
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