Alkalin Sulu Elektrolizde Diyafram İçi Boşluk Beslemesi ile Kütle Transferi Yoğunlaştırması

Özet (abstract)

Abstract Alkaline water electrolysis (AWE) coupled with fluctuating photovoltaic power confronts severe operational limitations stemming from intrinsic near-electrode mass transfer barriers. These transport defects exacerbate both ohmic polarization and trans-diaphragm H2/O2 crossover, significantly restricting the flexible operating window of electrolyzer stacks. Targeting these inherent limitations, this work proposes an innovative intradiaphragm gap (IDG) inside-to-out feeding configuration equipped with decoupled gas–liquid efflux channels. The IDG configuration achieves uniform close-range electrolyte supply across the entire electrode surfaces and mitigates two-phase buildup within the cell compartment via separate dual outlets. The hydrogen impurity level in oxygen streams remains below the 2 vol % safety threshold even at an ultralow current density of 10 mA cm–2. The IDG scheme lowers ohmic resistance by 25.3% and hydrogen-specific energy consumption by 1.15 kWh Nm–3 at 1000 mA cm–2. Under dynamic photovoltaic load fluctuations, the IDG electrolyzer maintains stable operation and compliant gas purity, yielding 14.3% higher annual hydrogen yield than conventional bottom-fed setups. Synergistically optimized electrolyte distribution and interfacial gas removal reinforce near-electrode mass transfer, improving overall cell efficiency and dynamic load adaptability. This feeding configuration provides a feasible retrofitting strategy for commercial alkaline electrolysis facilities.

Yazarların özeti; kaynağından alınmıştır. Industrial & Engineering Chemistry Research, 2026 · DOI ↗