Supercapacitor electrodes from activation of binderless green monoliths of biomass self-adhesive carbon grains composed of varying amount of graphene additive
| Autor: | Mohd. Amir Radhi Othman, Mohd Suleman, Mohamad Deraman, Chin Hua Chia, Mohd. Hashim, M. R M Jasni, Zalita Zainuddin |
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| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
Materials science Graphene Carbonization 020209 energy General Chemical Engineering Composite number General Engineering General Physics and Astronomy chemistry.chemical_element 02 engineering and technology law.invention chemistry law 0202 electrical engineering electronic engineering information engineering medicine General Materials Science Crystallite Composite material Porosity Carbon Activated carbon medicine.drug |
| Zdroj: | Ionics. 24:1195-1210 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-017-2283-7 |
| Popis: | Binderless electrodes of activated carbon monoliths (ACMs) and its composites with graphene are prepared by carbonization and activation of green monoliths consisting of self-adhesive carbon grains and 0–10 wt% KOH-treated graphene. Compared with ACMs, the optimized composite containing 6 wt% graphene exhibits more ordered micro-structures with increased crystallite height, and graphitic sp2 carbons (I D /I G = 0.49 vs. 0.91) along with enhanced porosity; as revealed by X-ray diffraction, Raman, and N2 adsorption-desorption studies. These modifications lead to increased electrical conductivity (13 vs. 9 S cm−1) through improved interconnections of carbon particles by graphene, and surface area ~ (800 vs. 456 m2 g−1) due to increased inter-particle spacing. Further, contrary to ACMs, the composite electrodes can offer faster delivery of energy in almost 50% less response time (5 vs. 8 s) due to reduced equivalent series resistance (1.67 vs. 2.65 Ω) and charge transfer resistance (0.55 vs. 1.33 Ω). |
| Databáze: | OpenAIRE |
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