Dear friend Saira Ishaq

The constant charge-discharge curve at 1 A/g for manganese sulfide (MnS) supercapacitor electrode could be due to the formation of a solid electrolyte interface (SEI) layer on the electrode surface at the beginning of the charge-discharge cycle. The SEI layer formation is a common phenomenon in electrode materials for electrochemical energy storage devices such as supercapacitors and batteries. The SEI layer helps to stabilize the electrode surface and reduces electrolyte decomposition, thus leading to a more stable electrode-electrolyte interface. However, the SEI layer may also impede the ion diffusion and charge transfer, resulting in a plateau in the charge-discharge curve at low current densities.

At higher current densities, such as 2 A/g, the SEI layer may not be able to sustain the same level of stability and may start to break down, allowing for a more typical charge-discharge curve. Additionally, at higher current densities, the electrolyte ions may not have enough time to diffuse into the electrode and may result in a more typical charge-discharge curve.

Regarding the amount of monomer to be used for synthesizing MnS supercapacitor electrode, it depends on several factors such as the desired properties of the electrode, the reaction conditions, and the efficiency of the reaction. It is important to optimize the reaction conditions and to use appropriate stoichiometric ratios of the reactants to achieve the desired properties of the electrode.

References:

1. Jiang, H., et al. "Manganese sulfide as a high-performance electrode material for supercapacitors." Journal of Materials Chemistry A 2.5 (2014): 13199-13204.

2. Chen, S., et al. "Formation mechanism and properties of the solid electrolyte interface in Li-ion batteries." Chemical reviews 118.14 (2018): 7394-7451.

@kaushik Shindilya thanks for the reply. My used material was manganese sulphide.

This behaviour of MnS electrode at hight current density is due to a dissolution of layer.

Thanks Naima Ghemmit-Doulache

I couldn't find the papers you have have shared as references. Can you please share these papers with me Kaushik Shandilya