The surface area plays a vital role in supercapacitor performance. Authors are suggested to calculate the electrochemically active surface area for the electrode materials.
This is a reviewer question
Raphael Mmaduka Obodo To analyze an SEM image using ImageJ software, set the scale correctly considering magnification and calibration details. Use the freehand selection tool to outline particles or features. In the Analyze tab, click on Measure to get the lowdown on selected particles or features. Repeat this process for multiple representative areas and average the results to estimate the total surface area. This process is easy and straightforward.
"Authors are suggested to calculate the electrochemically active surface area for the electrode materials."
Without knowing the text under review and seeing a representative image of the "super capacitor" it's hard to answer.
The contrast in a SEM image can be attributed to differences in composition (BSE signal + optimum beam energy) under good circumstances. If different brightness represents different composition then the area fractions from image processing can be connected to the composition.
SEM estimated area will not respond the reviewer's comment as electrochemically active area differs from visual and even BET surfaces. You should use electrochemical measuremets (EIS, CVA) on your material and material (on electrodes) with known surface and in your electrolyte.
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