Graphene electrodes of high power density were manufactured by a surfactant-water based exfoliation method followed by a scaleable spray-deposition process. Cyclic voltammetry and galvanostatic charge–discharge experiments revealed a combination of electric double layer and pseudocapacitive behavior that, unlike the many graphene-oxide derived electrodes, was maintained to unusually high scan rates of 10,000 mV s−1, reaching a maximum capacitance of 543 μF cm−2 and with a capacitive retention of 57\% at 10,000 mV s−1. The performance of graphene electrodes was contrasted with carboxylated single walled carbon nanotubes that showed a sharp decrease in capacitance above 200 mV s−1. Electrochemical impedance spectroscopy analysis showed a fast capacitor response of 17.4 ms for as manufactured electrodes which was further improved to 2.3 ms for surfactant-free 40 nm thick electrodes. A maximum energy density of 75.4 nW h cm−2 gradually decreased as power density increased up to 2.6 mW cm−2. Graphene electrodes showed 100\% capacitance retention for 5000 cycles at the high power scan rate of 10,000 mV s−1.
Mendoza-Sánchez et al_2013_Scaleable ultra-thin and high power density graphene electrochemical capacitor.pdf:files/843/Mendoza-Sánchez et al_2013_Scaleable ultra-thin and high power density graphene electrochemical capacitor.pdf:application/pdf;ScienceDirect Snapshot:files/838/S0008622312007725.html:text/html
%0 Journal Article
%1 mendoza-sanchez_scaleable_2013
%A Mendoza-Sánchez, Beatriz
%A Rasche, Bertold
%A Nicolosi, Valeria
%A Grant, Patrick S.
%D 2013
%J Carbon
%K imported
%P 337--346
%R 10.1016/j.carbon.2012.09.035
%T Scaleable ultra-thin and high power density graphene electrochemical capacitor electrodes manufactured by aqueous exfoliation and spray deposition
%U http://www.sciencedirect.com/science/article/pii/S0008622312007725
%V 52
%X Graphene electrodes of high power density were manufactured by a surfactant-water based exfoliation method followed by a scaleable spray-deposition process. Cyclic voltammetry and galvanostatic charge–discharge experiments revealed a combination of electric double layer and pseudocapacitive behavior that, unlike the many graphene-oxide derived electrodes, was maintained to unusually high scan rates of 10,000 mV s−1, reaching a maximum capacitance of 543 μF cm−2 and with a capacitive retention of 57\% at 10,000 mV s−1. The performance of graphene electrodes was contrasted with carboxylated single walled carbon nanotubes that showed a sharp decrease in capacitance above 200 mV s−1. Electrochemical impedance spectroscopy analysis showed a fast capacitor response of 17.4 ms for as manufactured electrodes which was further improved to 2.3 ms for surfactant-free 40 nm thick electrodes. A maximum energy density of 75.4 nW h cm−2 gradually decreased as power density increased up to 2.6 mW cm−2. Graphene electrodes showed 100\% capacitance retention for 5000 cycles at the high power scan rate of 10,000 mV s−1.
@article{mendoza-sanchez_scaleable_2013,
abstract = {Graphene electrodes of high power density were manufactured by a surfactant-water based exfoliation method followed by a scaleable spray-deposition process. Cyclic voltammetry and galvanostatic charge–discharge experiments revealed a combination of electric double layer and pseudocapacitive behavior that, unlike the many graphene-oxide derived electrodes, was maintained to unusually high scan rates of 10,000 mV s−1, reaching a maximum capacitance of 543 μF cm−2 and with a capacitive retention of 57\% at 10,000 mV s−1. The performance of graphene electrodes was contrasted with carboxylated single walled carbon nanotubes that showed a sharp decrease in capacitance above 200 mV s−1. Electrochemical impedance spectroscopy analysis showed a fast capacitor response of 17.4 ms for as manufactured electrodes which was further improved to 2.3 ms for surfactant-free 40 nm thick electrodes. A maximum energy density of 75.4 nW h cm−2 gradually decreased as power density increased up to 2.6 mW cm−2. Graphene electrodes showed 100\% capacitance retention for 5000 cycles at the high power scan rate of 10,000 mV s−1.},
added-at = {2024-03-25T12:35:57.000+0100},
author = {Mendoza-Sánchez, Beatriz and Rasche, Bertold and Nicolosi, Valeria and Grant, Patrick S.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2facc81fefd54511ddb8c6b2cc24b303f/brasche},
doi = {10.1016/j.carbon.2012.09.035},
file = {Mendoza-Sánchez et al_2013_Scaleable ultra-thin and high power density graphene electrochemical capacitor.pdf:files/843/Mendoza-Sánchez et al_2013_Scaleable ultra-thin and high power density graphene electrochemical capacitor.pdf:application/pdf;ScienceDirect Snapshot:files/838/S0008622312007725.html:text/html},
interhash = {a0f6eea7a278ca0b8b52e1829013d081},
intrahash = {facc81fefd54511ddb8c6b2cc24b303f},
issn = {0008-6223},
journal = {Carbon},
keywords = {imported},
month = feb,
pages = {337--346},
timestamp = {2024-03-25T12:35:57.000+0100},
title = {Scaleable ultra-thin and high power density graphene electrochemical capacitor electrodes manufactured by aqueous exfoliation and spray deposition},
url = {http://www.sciencedirect.com/science/article/pii/S0008622312007725},
urldate = {2013-07-11},
volume = 52,
year = 2013
}