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      Hierarchically porous carbon derived from polymers and biomass: effect of interconnected pores on energy applications

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          Abstract

          Access to hierarchically porous carbons from polymers and biopolymers via a non-templating route has emerged as a promising strategy for a range of energy applications.

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          Anomalous increase in carbon capacitance at pore sizes less than 1 nanometer.

          J Chmiola, G Yushin, Y Gogotsi … (2006)
          Carbon supercapacitors, which are energy storage devices that use ion adsorption on the surface of highly porous materials to store charge, have numerous advantages over other power-source technologies, but could realize further gains if their electrodes were properly optimized. Studying the effect of the pore size on capacitance could potentially improve performance by maximizing the electrode surface area accessible to electrolyte ions, but until recently, no studies had addressed the lower size limit of accessible pores. Using carbide-derived carbon, we generated pores with average sizes from 0.6 to 2.25 nanometer and studied double-layer capacitance in an organic electrolyte. The results challenge the long-held axiom that pores smaller than the size of solvated electrolyte ions are incapable of contributing to charge storage.
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            Graphene-wrapped sulfur particles as a rechargeable lithium-sulfur battery cathode material with high capacity and cycling stability.

            Hailiang Wang, Yuan Yang, Yongye Liang … (2011)
            We report the synthesis of a graphene-sulfur composite material by wrapping poly(ethylene glycol) (PEG) coated submicrometer sulfur particles with mildly oxidized graphene oxide sheets decorated by carbon black nanoparticles. The PEG and graphene coating layers are important to accommodating volume expansion of the coated sulfur particles during discharge, trapping soluble polysulfide intermediates, and rendering the sulfur particles electrically conducting. The resulting graphene-sulfur composite showed high and stable specific capacities up to ∼600 mAh/g over more than 100 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density.
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              KOH activation of carbon-based materials for energy storage

              Jiacheng Wang, Stefan Kaskel (2012)
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                Author and article information

                Journal
                Journal ID (publisher-id): EESNBY
                Title: Energy Environ. Sci.
                Abbreviated Title: Energy Environ. Sci.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 1754-5692
                ISSN (Electronic): 1754-5706
                Publication date Created: 2014
                Publication date (Print): 2014
                Volume: 7
                Issue: 11
                Pages: 3574-3592
                Article
                DOI: 10.1039/C4EE01075B
                PubMed ID: 37431642
                SO-VID: 425e5d83-d724-4b07-8650-ba6b984f80d0
                Copyright © © 2014
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