کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5021716 | 1469380 | 2016 | 45 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigating graphene/conducting polymer hybrid layered composites as pseudocapacitors: Interplay of heterogeneous electron transfer, electric double layers and mechanical stability
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Investigating graphene/conducting polymer hybrid layered composites as pseudocapacitors: Interplay of heterogeneous electron transfer, electric double layers and mechanical stability Investigating graphene/conducting polymer hybrid layered composites as pseudocapacitors: Interplay of heterogeneous electron transfer, electric double layers and mechanical stability](/preview/png/5021716.png)
چکیده انگلیسی
Hybrid electrochemical electrodes consisting of supercapacitive graphene nanosheets and pseudocapacitive conducting polymers such as polypyrrole (PPy) and polyaniline (PAni) are constructed layer-by-layer (LbL) via in-situ electropolymerization followed by electrochemical reduction of graphene oxide (ErGO) forming (PPy/ErGO)n=1 and (PAni/ErGO)n=1 bilayers, with subsequent multilayers up to n = 5. We investigated structural, physical and electrochemical properties and the hybrids prepared using this Scheme 1 showed excellent electro-chemo-mechanical stability and enhanced electrochemical performance attributed to appropriate polymer chain conformations and covalently tailored and chemically bridged interface-promoted synergistic effects. From cyclic voltammograms, we determined gravimetric specific capacitance (Cs) at scan rate 10 mV/s and at a discharge current density of 1.0 A gâ1 that ranged 300-560 F gâ1 outperforming other hybrid supercapacitors and capacity retention of â¼90% over 1000 cycles at a specific current density of 1.5 A gâ1. From electrochemical impedance spectroscopy data fitting and circuit simulations we determined various equivalent circuit parameters including low frequency (Clf) and interfacial capacitance, charge transfer and solution resistance that helped to calculate gravimetric power and energy densities. We also prepared PAni/rGO multilayer pseudocapacitors by varying rGO weight loading by electrostatic LbL assembly (Scheme 2) and compared their electrochemical properties with those of Scheme 1. The findings reveal the significance of electro-processing and electrodeposition and clearly elucidate the role of engineered interfaces in enhancement of interfacial properties i.e. heterogeneous electron transfer, diffusion coefficient, mechanical strength and electrical double layer in Scheme 1 graphene-polymer hybrids.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Composites Part B: Engineering - Volume 105, 15 November 2016, Pages 46-59
Journal: Composites Part B: Engineering - Volume 105, 15 November 2016, Pages 46-59
نویسندگان
Sanju Gupta, Carson Price,