کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4767000 | 1424116 | 2017 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ionothermal Synthesis of Graphene-Based Hierarchically Porous Carbon for High-Energy Supercapacitors with Ionic Liquid Electrolyte
ترجمه فارسی عنوان
سنتز یونوترمال از کربن متخلخل سلولهای متخلخل بر اساس گرافن برای ابررسانایهای با انرژی بالا با الکترولیت مایع یونی
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کلمات کلیدی
کربن نانوپور ابرخازنها، مایعات یونی، سنتز یونوترمالی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Electrochemical double layer capacitors (EDLCs), storing charges by electrostatic attraction of electrolyte ions to the surface of charged electrodes, require an improved energy density to broaden their applications. Here a high-energy-density EDLC is reported by employing ionic liquids not only as the solvent for material synthesis but also as electrolyte. Graphene-based hierarchically porous carbon (GPC) are synthesized via ionothermal method, and exhibits high specific capacitance of 313Â FÂ gâ1 and 212Â FÂ gâ1 at a current density of 0.5Â AÂ gâ1 in aqueous and ionic liquid electrolytes, respectively. The obtained GPC electrode retains about 94.2% of the initial capacitance after 10000 charge/discharge cycles at a current density of 2Â AÂ gâ1 in aqueous electrolyte, strongly reflecting an excellent long-term cycling stability and rate capability of the electrode. A promoted energy density of 90.4Â W h kgâ1 can be obtained with neat ionic liquid electrolyte, which is about 8 times higher than that with aqueous electrolyte. The ionothermal process guarantees the acquisition of the hierarchical porous structure and high surface area, while the ionic liquid electrolyte assures a broader operating voltage, which both helps to increase the energy density of EDLCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 241, 1 July 2017, Pages 124-131
Journal: Electrochimica Acta - Volume 241, 1 July 2017, Pages 124-131
نویسندگان
Xiao-Feng Hao, Yang Yan, Li-Guo Gao, Wen-Sheng Mu, Ce Hao,