Capacitive dominated charge storage in supermicropores of self-activated carbon electrodes for symmetric supercapacitors
- Title
- Capacitive dominated charge storage in supermicropores of self-activated carbon electrodes for symmetric supercapacitors
- Creator
- Bhat V.S.; Toghan A.; Hegde G.; Varma R.S.
- Description
- The present work demonstrates a systematic study of pore size and specific surface area (SSA) of biomass-derived carbon and the choice of electrolyte concentrations affecting charge-storage mechanism (surface controlled and diffusion controlled) and electrochemical behaviour. Porous nanocarbons derived from Caesalpinia Sappan pods were synthesized by pyrolysis at 400, 600, and 800 C. Pyrolysis at 800 C was found suitable for the self-activation mechanism which formed bimodal porous nanocarbons with a high SSA of 675 m2/g. A maximum specific capacitance of 261.8 F/g at 0.5 A/g in 5.0 M KOH was observed for electrode materials synthesized at 800 C. The highlight of the study is the porous nanocarbon synthesized at 800 C which was found to possess micropores of size 0.71.0 nm playing a pivotal role in enhancing capacitance. The effect of electrolyte concentration on capacitance and charge storage mechanisms was also analyzed. A diffusion-controlled self-discharge model is established for supercapacitor devices. The single cell can power a red LED for 15 min; exemplifying the sustainable strategy of the utilization of abundant bio-waste to efficient energy storage devices. 2022 Elsevier Ltd
- Source
- Journal of Energy Storage, Vol-52
- Date
- 2022-01-01
- Publisher
- Elsevier Ltd
- Subject
- Biomass; Capacitive storage; Porous carbons; Self-activation; Solid-state supercapacitors; True performance metrics
- Coverage
- Bhat V.S., Centre for Nano-materials & Displays (CND), B.M.S. College of Engineering, Bull Temple Road, Karnataka, Bangalore, 560019, India, Department of Materials Science, Mangalore University, Mangalagangotri, Karnataka, Mangalore, 574 199, India; Toghan A., Chemistry Department, Faculty of Science, South Valley University, Qena, 83523, Egypt, Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Saudi Arabia; Hegde G., Centre for Advanced Research and Development (CARD), CHRIST (Deemed to be University), Hosur Rd, Bhavani Nagar, S.G. Palya, Karnataka, Bangalore, 29, India, Department of Chemistry, CHRIST (Deemed to be University), Hosur Rd, Bhavani Nagar, S.G. Palya, Karnataka, Bangalore, 29, India; Varma R.S., Regional Center of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacky University, lechtitel? 27, Olomouc, 783 71, Czech Republic
- Rights
- Restricted Access
- Relation
- ISSN: 2352152X
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Bhat V.S.; Toghan A.; Hegde G.; Varma R.S., “Capacitive dominated charge storage in supermicropores of self-activated carbon electrodes for symmetric supercapacitors,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 24, 2025, https://archives.christuniversity.in/items/show/14967.