Aqueous organic redox flow batteries (AORFBs) attract a significant attention for large-scale energy storage systems 

owing to their intrinsic safety, low cost, and design flexibility. Among various organic redox couples, 2-hydroxy-1,4-naphthoquinone

(Lawsone) and ferrocyanide (FeCN) combination exhibits a promising electrochemical performance. However,

its practical application is hindered by capacity decay arising from side reactions occurring under strongly alkaline 

conditions. Although chemical modification of Lawsone proposes to improve cycling stability, such approaches generally 

require complex synthesis and increase material cost. In this work, supporting electrolyte composition is adjusted to alleviate

the strongly alkaline environment without modifying the active material. Specifically, hydroxide is partially replaced 

with chloride to reduce alkalinity of electrolyte and the effects of potassium salt anions on electrochemical behavior and 

battery performance of Lawsone anolyte is investigated. Contrary to the initial expectation, conventional 1 M KOH electrolyte

exhibits superior electrochemical kinetics, leading to higher capacity utilization and improved cycling stability than 

the mixed electrolyte (0.8 M KCl+0.2 M KOH). AORFB employing 1 M KOH retains 72% of its initial capacity after 

100 cycles, whereas mixed electrolyte preserves only 42%. These findings indicate that electrochemical performance is 

governed not only by electrolyte alkalinity but also by the nature of supporting electrolyte anion.