Peanut shell hybrid sodium ion capacitor with extreme energy-power rivals lithium ion capacitors

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DOIResolve DOI: http://doi.org/10.1039/c4ee02986k
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TypeArticle
Journal titleEnergy and Environmental Science
ISSN1754-5692
Volume8
Issue3
Pages941955; # of pages: 15
SubjectCapacitors; Carbon; Cathodes; Electrodes; Metal ions; Oilseeds; Shells (structures); Capacity retention; Hierarchically porous; Ion intercalation; Li-ion capacitors; Lithium-ion capacitors; Single precursors; adsorption; ion; lithium; power generation; sodium; surface area; Arachis hypogaea
AbstractThis is the first report of a hybrid sodium ion capacitor (NIC) with the active materials in both the anode and the cathode being derived entirely from a single precursor: peanut shells, which are a green and highly economical waste globally generated at over 6 million tons per year. The electrodes push the envelope of performance, delivering among the most promising sodiation capacity-rate capability-cycling retention combinations reported in the literature for each materials class. Hence the resultant NIC also offers a state-of-the-art cyclically stable combination of energy and power, not only in respect to previously but also as compared to Li ion capacitors (LICs). The ion adsorption cathode based on Peanut Shell Nanosheet Carbon (PSNC) displays a hierarchically porous architecture, a sheet-like morphology down to 15 nm in thickness, a surface area on par with graphene materials (up to 2396 m2 g-1) and high levels of oxygen doping (up to 13.51 wt%). Scanned from 1.5-4.2 V vs. Na/Na+ PSNC delivers a specific capacity of 161 mA h g-1 at 0.1 A g-1 and 73 mA h g-1 at 25.6 A g-1. A low surface area Peanut Shell Ordered Carbon (PSOC) is employed as an ion intercalation anode. PSOC delivers a total capacity of 315 mA h g-1 with a flat plateau of 181 mA h g-1 occurring below 0.1 V (tested at 0.1 A g-1), and is stable at 10000 cycles (tested at 3.2 A g-1). The assembled NIC operates within a wide temperature range (0-65 °C), yielding at room temperature (by active mass) 201, 76 and 50 W h kg-1 at 285, 8500 and 16500 W kg-1, respectively. At 1.5-3.5 V, the hybrid device achieved 72% capacity retention after 10000 cycles tested at 6.4 A g-1, and 88% after 100000 cycles at 51.2 A g-1.
Publication date
PublisherRoyal Society of Chemistry
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology
Peer reviewedYes
NPARC number21275717
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Record identifiere85c73ef-c75a-40ab-8150-97a7e958de78
Record created2015-07-14
Record modified2016-05-09
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