Type

Journal Article

Authors

Greg Moriarty
Niall Mcevoy
Zahra Gholamvand
Valeria Nicolosi
Beatriz Mendoza Sanchez
Georg Duesberg
João Carlos Mesquita Coelho
Nina Berner
David McAteer
Jonathan Coleman
and 1 others

Subjects

Chemistry

Topics
percolation electrical properties composite films manganese carbon nanotube composite electrode thin film nanotubes composites supercapacitor percolation capacitance nanotube manganese dioxide carbon dioxide carbon carbon composites carbon electrodes

Effect of percolation on the capacitance of supercapacitor electrodes prepared from composites of manganese dioxide nanoplatelets and carbon nanotubes (2014)

Abstract Here we demonstrate significant improvements in the performance of supercapacitor electrodes based on 2D MnO2 nano-platelets by the addition of carbon nanotubes. Electrodes based on MnO2 nano-platelets do not display high areal capacitance because the electrical properties of such films are poor, limiting the transport of charge between redox sites and the external circuit. In addition, the mechanical strength is low, limiting the achievable electrode thickness, even in the presence of binders. By adding carbon nanotubes to the MnO2-based electrodes, we have increased the conductivity by up to eight orders of magnitude, in line with percolation theory. The nanotube network facilitates charge transport, resulting in large increases in capacitance, especially at high rates, around 1 V/s. The increase in MnO2 specific capacitance scaled with nanotube content in a manner fully consistent with percolation theory. Importantly, the mechanical robustness was significantly enhanced, allowing the fabrication of electrodes that were 10 times thicker than could be achieved in MnO2-only films. This resulted in composite films with areal capacitances up to 40 times higher than could be achieved with MnO2-only electrodes.
Collections Ireland -> Trinity College Dublin -> RSS Feeds
Ireland -> Trinity College Dublin -> School of Physics
Ireland -> Trinity College Dublin -> Physics (Scholarly Publications)
Ireland -> Trinity College Dublin -> RSS Feeds
Ireland -> Trinity College Dublin -> Physics

Full list of authors on original publication

Greg Moriarty, Niall Mcevoy, Zahra Gholamvand, Valeria Nicolosi, Beatriz Mendoza Sanchez, Georg Duesberg, João Carlos Mesquita Coelho, Nina Berner, David McAteer, Jonathan Coleman and 1 others

Experts in our system

1
Niall Mcevoy
Trinity College Dublin
Total Publications: 54
 
2
Zahra Gholamvand
Trinity College Dublin
Total Publications: 7
 
3
Valeria Nicolosi
Trinity College Dublin
Total Publications: 67
 
4
Georg Duesberg
Trinity College Dublin
Total Publications: 116
 
5
João Coelho
Trinity College Dublin
Total Publications: 10
 
6
Nina C Berner
Trinity College Dublin
Total Publications: 20
 
7
David McAteer
Trinity College Dublin
Total Publications: 6
 
8
Jonathan Coleman
Trinity College Dublin
Total Publications: 217