SO₂-depolarized electrolysis (SDE) is the key process in the hybrid sulfur cycle for green hydrogen production, but the detailed SDE characteristics including products generation, current efficiency variation, and side reactions are unclear. Herein, a continuous SDE process was experimentally conducted and theoretically modelled. The H₂ and H₂SO₄ production was accelerated and the current efficiency for both electrodes was improved with a proper increase in current density (50−100 mA/cm²) or temperature (293−318 K), but further increasing current density to 150 mA/cm² or temperature to 333 K led to a negative trend because of the anode corrosion or declined SO₂ solubility. The increasing initial H₂SO₄ concentration (10−40 wt%) facilitated the cathodic H₂ production and current efficiency, while negatively influenced the anodic SO₂ conversion. The parasitic reactions occurred at cathode consumed H₂ and resulted to the cathodic current efficiency well below 100%. A rigorous mathematical regression model correlating the production rates of H₂ and H₂SO₄ with current density, temperature, and initial H₂SO₄ concentration was developed, and combined with the analysis of variance, current density was suggested the biggest factor affecting products generation in SDE process. These findings demonstrate a practical avenue for efficient SO₂ conversion and H₂ production in SDE process of hybrid sulfur cycle.

SO ₂去极化电解(SDE)是混合硫循环绿色制氢的关键过程，但SDE的详细特征，包括产物生成、电流效率变化和副反应尚不清楚。在此，对连续 SDE 过程进行了实验和理论建模。^{随着电流密度（50−100 mA/cm 2}）或温度（293−318 K）的适当增加， H ₂和H ₂ SO ₄的产生加速，并且两个电极的电流效率都得到提高，但进一步增加电流密度由于阳极腐蚀或SO ₂溶解度下降，电流达到150 mA/cm ²或温度达到333 K 会导致负趋势。增加初始H ₂ SO ₄浓度（10−40 wt%）有利于阴极H _{2 的}产生和电流效率，同时对阳极SO ₂转化产生负面影响。阴极发生寄生反应，消耗H ₂，导致阴极电流效率远低于100%。_{建立了严格的数学回归模型，将H 2}和H ₂ SO ₄的产率与电流密度、温度和初始H ₂ SO ₄浓度相关联，并结合方差分析，提出了电流密度是影响产品的最大因素。 SDE过程中的生成。这些发现证明了在混合硫循环的SDE过程中高效SO ₂转化和H ₂生产的实用途径。