The OCV primarily depends on the selection of catalysts. The GDL modification also plays a crucial role in achieving considerable OCV of ZAB. The electrode ink preparation should be optimized in terms of catalyst loading, amount of binder and carbon additive, solvent, etc. Uniform coating of the GDL surface is also important.
Dear Deepika ..,
say, please, what is the origin, morphology and the purity of your Zn-electrode(s) ?
If possible, present/show, please, either 1)a Tafel analysis[1], or 2)some CV(s), around your quasi-OCV (1.2V +-0.3V).
1. Enhanced Cycling Performance of Rechargeable Zinc–Air Flow Batteries Using Potassium Persulfate as Electrolyte Additive https://www.mdpi.com/1422-0067/21/19/7303/pdf
Look at the work of Richard Eckl, TUM. He analysed Zn-air in detail and found similar effects. Read his dissertation 8in English) and one of his papers.
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