I am trying to study the electrochemical behaviour of SnO2 nanoparticles and whenever i use KOH or other electrolytes i dont measure any significant capacitance but when i use H2So4 i get some better CV readings, I am wondering does it have to do something with high ionic conductivity of H2So4? and if so why using H2So4 is a bad idea?
Hello Abisheik john Samuel
In other research articles, authors synthesize electrode material with different techniques. So, the morphology, surface area, porosity of the materials are different for each though the active material is same. So, favorable electrolyte for the same material synthesized by others can be different. You get best results in H2SO4. So, SnO2 electrode synthesized by you exhibits optimum results in the presence of H2SO4 like polymers. Generally polymers and carbon eectrodes exhibit good results in H2SO4. For other materials, H2SO4 react with electrode strongly and peel off the material. And yes, H2SO4 has greater reactivity and conductivity ( approx 400 mScm-1 ) comapre to neutral electrolytes.
Link - http://www.chemikinternational.com/wp-content/uploads/2013/11/11_13_Ka-Lota_GB3.pdf
Check my each publications. I have calculated and described briefly. I think it will clear your concept. I have attached a few here.
Article Hexagonal VS2 Anchored MWCNTs: First Approach to Design Flex...
Article V2O5 encapsulated MWCNTs in 2D surface architecture: Complet...
Article Free-standing flexible MWCNTs bucky paper: Extremely stable ...
H2O2, or acidic electrolyte is generally better than neutral and basic electrolyte due to the proton hopping mechanism, possible only in acidic media.
If you want to read more:
A. Bard and L. R. Faulkner, Electrochemical Methods: Fundamentals and Applications, Wiley, New York, 1980.
There is multiple reason for not using H2SO4 for any kind of supercapacitor studies
1. H2SO4 is corrossive to the electrode material and there will be irreversible faradaic reactions between the active material and the H2SO4. This is lead to degradation of of supercapacitor performance over time.
2. Because of same corrosive property, H2SO4 is not a safe electrolyte to use. It can cause skin burn and many other respiratory problem. This is why, H2SO4 is not a recommended electrolyte for electrochemical studies.
3. In the commercial supercapacitor cells, cellulose papers are used as separator and Cu or Al lead are used current collector. None of these are compatible with H2SO4 electrolyte.
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