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Human activities in daily life and industrial production generate a significant volume of substandard water with high salt content, organic compounds, and other pollutants, often exhibiting a neutral pH. Electrochemical oxidation is a widely applied technique for the purification of water sources. By integrating electrochemical oxidation reactions with electrolytic hydrogen evolution reactions, the potential arises to enhance energy utilization efficiency and reduce cost implications. This study describes the advantages and challenges of neutral aqueous chlorine solutions as electrolytes for hydrogen production from electrolyzed water. The cathodic and possibly anodic reactions in the electrolysis of neutral chlorinated electrolytes are also investigated. Finally, we present the progress of research on cathode and anode catalysts used in electrolyzing neutral chlorine-containing electrolytes. The aim is to inspire the research of industrialized low-cost and high-yield integrated hydrogen production systems. [Display omitted] • Concluded the challenges of electrolysis of neutral chlorine-containing solutions. • Low-energy anode reaction coupled with hydrogen evolution reaction can reduce lower. • Concludes the design principles of cathode and anode catalysts for water splitting. [ABSTRACT FROM AUTHOR]

[Display omitted] • Uniform nanoporous is prepared on high-entropy amorphous alloy by controllable corrosion. • The electrode shows superior HER catalytic performance and corrosion resistance in hot H 2 SO 4. • Provide a strategy for in situ construction and repair of the catalytic interface. Producing high-purity hydrogen from water electrolysis using intermittent renewable electricity is fascinating and challenging. Noble metal-based high-entropy alloy with near-equimolar mixed elements have unique properties including cocktail effect, high entropy effect and lattice distortion effect, which are beneficial to improve catalytic performance and reduce the amount of noble metal. Taking advantages of excellent mechanical properties, high thermal stability and corrosion resistance, as well as chemical uniformity and tunability, equiatomic high-entropy metallic glass PdPtCuNiP was employed to construct nanosponge-like architecture with uniform nanopores via a precise strategy of potentiostatic electrochemical dealloying, which presented superior hydrogen evolution reaction (HER) electrocatalytic performance in hot dilute H 2 SO 4. The Tafel slope is 34.2 mV dec−1 and the overpotential corresponding to 10 mA cm−2 is 35.4 mV, outperforming commercial Pt/C catalyst and most currently available electrocatalysts. Furthermore, even electrocatalytic performance of nanoporous PdPtCuNiP is degraded tinily by hot dilute H 2 SO 4 accordng to power-off or low-voltage operation of water-electrolysis system, it can be directly refreshed by in-situ potentiostatic polarization in the electrolyzer. We believe the strategy of in-situ construction and repair of nanostructured electrocatalytic surface on high-entropy alloy in this study will call for more endeavors to realize the practicality of hydrogen production in harsh acidic electrolyte. [ABSTRACT FROM AUTHOR]