کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6609866 459548 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of electrochemical supercapacitors with uniform nanoporous silver network
ترجمه فارسی عنوان
توسعه الکتروشیمیایی با یک شبکه نقره ای نانوپور
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
Metal oxides such as manganese dioxide (MnO2) are often used as electrode materials for supercapacitors due to their high specific capacitance. In practice, however, their specific capacitance is much smaller than the theoretical limit due to the low electrical conductivity and serious agglomeration. In the present work, we demonstrate that highly conductive nanoporous silver (NPS) network with uniform continuous nanoporosity and high surface area which was fabricated by dealloying Ag-Mg-Ca metallic glasses can be employed as supports and collectors for MnO2 capacitors. By plating the MnO2 nanocrystals into the nanopore structure, the NPS/MnO2 composite electrode provides fast ionic conduction and excellent electron-proton transport, resulting in an ultrahigh specific capacitance of the plated active MnO2 (∼1088 F g−1), which is close to the theoretical limit. The unique combination of high specific capacitance and long cycle life enhanced by the current composite structure makes the NPS/MnO2 composite promising for electrochemical supercapacitor as electrode material. In addition, our findings suggest that the uniform NPS network is capable for improving capacitance performance of metal oxides in electrochemical supercapacitors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 182, 10 November 2015, Pages 224-229
نویسندگان
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