Capacitance of electrochemical capacitors generally represented in relative scale, i.e. the units are represented either related to electrode area or the mass of active material. In most of the cases the cell capacitance does not varies linearly with the mass loading and the electrode area. So, for a same material low mass loading often gives much higher gravimetric specific capacitance. And for a fixed electrode area a same electrode material gives higher areal specific capacitance for higher mass loading.
I am looking for your suggestion for this, that what should I do to overcome these ambiguity. Before representation should I find out the highest possible cell capacitance by varying the mass loading on fixed electrode area?
Dear Himadri Raha,
at low mass loading range, the cell capacitance Cc is a multi-factor special complex case study, depending on the substrate type[1,2], the substrate's coverage[3], the type of the electrolyte, the electrolyte's concentration, etc.
Also, at low mass loading range, the capacitance Cc, commonly, increases[3] along with the mass loading (mL) till a point mL-high, that Cc will vary (also increases slowly) with another (mass loading, slower rate) formula.
1. Comparative studies of nickel oxide films on different substrates for electrochemical supercapacitors https://www.sciencedirect.com/science/article/abs/pii/S0378775306006239
2. Substrate-assisted self-organization of Ni–Cu spherical double hydroxide (SDH) and its excellent pseudo-capacitive performance https://pubs.rsc.org/en/content/articlelanding/2014/ta/c3ta14374k#!divAbstract
3. A cheap and non-destructive approach to increase coverage/loading of hydrophilic hydroxide on hydrophobic carbon for lightweight and high-performance supercapacitors https://www.nature.com/articles/srep18108.pdf
Dear Himadri,
The cell capacitance varies linearly with the mass loading and the electrode area till a point it will not increase linearly. According to film structure (due to deposition method) and electrolyte used.
gravimetric capacitance is more suitable scale for analyzing materials efficiency. in case of areal capacitance;its capacitance with constant area increases as thickness or amount of material deposited increases.
Dear Md. Usman,
Gravimetric capacitance also increases with the decreased mass loading at a constant area.
Dear Himadri Raha,
at low mass loading range, the cell capacitance Cc is a multi-factor special complex case study, depending on the substrate type[1,2], the substrate's coverage[3], the type of the electrolyte, the electrolyte's concentration, etc.
Also, at low mass loading range, the capacitance Cc, commonly, increases[3] along with the mass loading (mL) till a point mL-high, that Cc will vary (also increases slowly) with another (mass loading, slower rate) formula.
1. Comparative studies of nickel oxide films on different substrates for electrochemical supercapacitors https://www.sciencedirect.com/science/article/abs/pii/S0378775306006239
2. Substrate-assisted self-organization of Ni–Cu spherical double hydroxide (SDH) and its excellent pseudo-capacitive performance https://pubs.rsc.org/en/content/articlelanding/2014/ta/c3ta14374k#!divAbstract
3. A cheap and non-destructive approach to increase coverage/loading of hydrophilic hydroxide on hydrophobic carbon for lightweight and high-performance supercapacitors https://www.nature.com/articles/srep18108.pdf
Specific capacitance is defined as the capacitance per unit mass. So, for specific capacitance only capacitance/mass can be used. Generally speaking, since specific capacitance and areal capacitance ( capacitance per unit of area) represent two different properties of the electrode, it would be better to report both of them.
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering
- Electrodes