The present study is dedicated to the new design and evaluation in the field of electrochemical reaction processing, conducted using experimental and theoretical validations alongside thermodynamic, economic, and life cycle analyses. The findings indicate that electrochemical reaction processes offer higher efficiency and lower hydrogen production costs compared to other methods. Among water-splitting processes, the hybrid-sulfur cycle (as a thermochemical cycle) was selected as a highly promising candidate due to its potential for higher efficiency and lower costs relative to alkaline water electrolysis. In this context, SO₂-depolarized electrolysis plays a critical role in the hybrid-sulfur process. The experimental section investigates the effects of several key parameters including temperature, differential pressure, current density, differential voltage, and electrolyte concentration, as well as membrane electrode assembly preparation conditions such as resin content in the Pt nanoparticle loaded on Vulcan carbon XC-72 catalyst layers, hot-press temperature, and catalyst loading on the performance of SO₂-depolarized electrolysis. In the theoretical part the activation energy and energy barrier of the chemical reaction of hydrogen generation, calculations have been carried out at B3LYP/6-311+G(d) level of theory. Vibrational frequencies and relative energies for all stationary points were determined. Transition states were identified and confirmed by intrinsic reaction coordinate calculations.