کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9952674 | 1459775 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dependence of supercapacitor performance on macro-structure of monolithic biochar electrodes
ترجمه فارسی عنوان
وابستگی عملکرد ابررایانه به ساختار کلان الکترودهای زیستی یکپارچه
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تکنولوژی و شیمی فرآیندی
چکیده انگلیسی
Large-scale applications of recalcitrant biochar produced from photosynthetic biomass are considered a “carbon-negative” measure that can help reduce the growing stockpile of atmospheric carbon. One such application is to use biochar as the electrode material in supercapacitors, a fast-charging and long-lasting electrical energy storage device. To facilitate devices' performance, commercial supercapacitor electrodes typically take the form of thin films (â¼50â¯Î¼m) made of activated carbon powder and a binder. Consequently, the fraction of active electrode material is small, as is its energy density. While thickening electrodes increases the fraction of active material, it also raises the resistance to electron and ion transport within the powder-based electrode. It is hypothesized that the use of monolithic biochar will enable thicker electrodes with adequate device performance. In this work, supercapacitor cells were constructed with monolithic biochar electrodes of different orientations and thickness. The specific capacitance and its dependence on current density were measured with a set of electrochemical methods and used to evaluate the performance of these cells. These experiments revealed that the inherent macro-structure of biochar plays a significant role in determining the performance of monolithic biochar electrodes. The dimension of structural features, such as the length of tracheids, can dictate the depth of electrolyte penetration. It is demonstrated that the proper design and manufacturing of monolithic biochar can extend the effective thickness of supercapacitor electrode to â¼1â¯cm, establishing the feasibility of increasing energy density of supercapacitors by using thick, monolithic biochar.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biomass and Bioenergy - Volume 118, November 2018, Pages 126-132
Journal: Biomass and Bioenergy - Volume 118, November 2018, Pages 126-132
نویسندگان
Johnathon N. Caguiat, Gabriel Arpino, Sally G. Krigstin, Donald W. Kirk, Charles Q. Jia,