Probably you have inverted the Units it should be m2/g and not g/m2. Main influence is the Pt size and level of agglomeration of the particle, given that you work in a clean electrolyte (I guess you do RDE, and no contamination form ions or other strong adsorb species). I/C should not have any or only small effect to ECSA. In terms or kinetics addition of ionomer reduces performance indeed.
have a look how to measure is a good example ncbi.nlm.nih.gov/pmc/articles/PMC5931774/
Dear Li,
as Alessandro Zana mentioned, the ECSA should be m2/g. The ECSA value you reported (if it is 30 m2/g) is relatively low, but not a very unusual reading for commercial Pt/C. Particle agglomeration is the predominant factor that results in ECSA loss. I suggest you can measure particle size to validate your results.
Loss of ECSA will inevitably lead to efficiency losses and degradation for standard Pt/C catalysts.
Dear Li Li, during half-cell measurements ECSA is mainly influenced by ionomer type and content as well as by catalyst loading onto the electrode. Agglomerates might be not fully accessible and would lead to a smaller calculated ECSA.
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