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Cotton fabric has been processed into hierarchically porous carbon with a two-step chemical-free method, i.e. carbonization in nitrogen and controlled thermal oxidation in air. By optimizing thermal oxidation temperature, large surface area of 777 m2/g could be achieved in cotton fabric derived carbon. The processed carbon remained the micron-meter tubular structure (same as cotton fiber), while meso-/micro-pores...
Doped carbon allotropes are promising materials for use in a range of applications in energy harvesting and gas adsorption. Synthesis of multifunctional C is however challenging as it requires simultaneous control over surface area, conductivity, chemical nature and loading of heteroatoms in the carbon matrix, usually yielding a material at a time that favours a single application. Pyridinic-N on...
Over the last decade there has been an increasing worldwide demand for electrochemically active materials for supercapacitor applications. In this study, a novel PANI derivative, poly (2-methyl thioaniline) coated MWCNT (PMTA@CNT) and its composite with graphene (PMTA@CNT/RGO) have been explored for supercapacitor application. Both the PMTA@CNT and PMTA@CNT/RGO electrodes showed much higher specific...
Cross-linked, N-doped, pillared-layered porous carbons (NCs) were prepared via a one-pot, template-free pyrolysis process at 600 (NC600), 700 (NC700) and 800 °C (NC800), which have bifunctional applications in supercapacitors and environmental remediation. NC700 displays a high surface area (2118 m2 g−1) and a specific capacitance of 305 F g−1 at 0.2 A g−1 in a two-electrode setup. The maximum energy...
A graphene doped carbon xerogel was synthesized by simply replacing the water (solvent) by an aqueous well-dispersed graphene oxide stable suspension in the precursor mixture used for the synthesis of the organic xerogel. During the carbonization of the organic xerogel, the graphene oxide sheets are reduced to graphene, which is embedded and well dispersed within the carbon xerogel matrix. Only a...
Graphene-based electrodes for high performance supercapacitors are developed by taking advantage of particle size control, large mass loading, and surface functionalization of reduced graphene oxide (rGO) sheets. Two controlled sizes of graphene sheets (100 nm vs. 45 μm average lateral dimensions) were prepared to study two-electrode system performance. The nano-size graphenes led to the formation...
The rapid advances in implantable electronic medical devices make supercapacitors highly desirable as power sources. These supercapacitors should be biocompatible, lightweight, miniature and stable without the need for packaging, which unfortunately remains unavailable yet. Here a new family of biocompatible carbon nanotube fibers were synthesized as electrodes to fabricate new supercapacitors that...
Heteroatom-doped porous carbons have currently been regarded as the promising materials for supercapacitors because of their outstanding contributions in Faradaic capacitance and electrolyte accessibility. In the present study, O/N co-doped porous carbons have been prepared by carbonization of ammonium citrate single precursor followed by KOH activation. The as-synthesized carbon (ACA-800) has a finely-layered...
The use of metal oxides in carbon-based supercapacitors (SCs) is regarded as an efficient strategy to obtain enhanced capacity. However, the poor cycle stability of pseudocapacitive metal oxides and the low capacitance of carbon-based materials limit the performance of SC. In this work, charcoal-derived activated carbon (CAC) is obtained by KOH activation and CO2 activation of various durations, and...
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