کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1292999 1497999 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of pH-induced chemical modification of hydrothermally reduced graphene oxide on supercapacitor performance
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Effect of pH-induced chemical modification of hydrothermally reduced graphene oxide on supercapacitor performance
چکیده انگلیسی

Three kinds of reduced graphene oxides are prepared by hydrothermal reduction under different pH conditions and their pseudocapacitive performances are evaluated using full-cell supercapacitor devices. The pH values are found to have great influence on the performance of the supercapacitors, achieving the highest specific capacitance value reported for hydrothermal reduced graphene oxide supercapacitors. Acidic and neutral media yield reduced graphene oxides with more oxygen-functional groups and lower surface areas but with broader pore size distributions than those in basic medium. The graphene produced in the basic solution (nitrogen-doped graphene) presents mainly electrochemical double layer (ECDL) behavior with specific capacitance of 185 F g−1, while the graphene produced under neutral or acidic conditions show both ECDL and pseudocapacitive behavior with specific capacitance of 225 F g−1 (acidic) and 230 F g−1 (neutral), respectively, at a constant current density of 1 A g−1. The influence of pH on cycling performance and electrochemical impedance of the supercapacitive devices is also presented.

Figure optionsDownload as PowerPoint slideHighlights
► Synthesis of reduced graphene oxide (rGO) by hydrothermal reduction of graphite oxide.
► Influence of pH value on the morphology and supercapacitor performance of rGOs.
► rGOs prepared under acidic condition exhibit a maximum specific capacitance of 225 F g−1
► Functional groups present in the acidic sample induce additional pseudocapacitance effect.
► rGOs prepared under basic condition exhibit superior cycling stability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 233, 1 July 2013, Pages 313–319
نویسندگان
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