Type

Journal Article

Authors

Jonathan N Coleman
Georg S Duesberg
Eoghan O'Malley
Andrew Harvey
Niall McEvoy
Zahra Gholamvand
David McAteer

Subjects

Chemistry

Topics
exfoliated nanosheets scaling carbon electrodes carbon nanotube dependence hydrogen production percolation composite

Thickness Dependence and Percolation Scaling of Hydrogen Production Rate in MoS2 Nanosheet and Nanosheet-Carbon Nanotube Composite Catalytic Electrodes. (2015)

Abstract Here we demonstrate that the performance of catalytic electrodes, fabricated from liquid exfoliated MoS2 nanosheets, can be optimized by maximizing the electrode thickness coupled with the addition of carbon nanotubes. We find the current, and so the H2 generation rate, at a given potential to increase linearly with electrode thickness to up ∼5 μm after which saturation occurs. This linear increase is consistent with a simple model which allows a figure of merit to be extracted. The magnitude of this figure of merit implies that approximately two-thirds of the possible catalytically active edge sites in this MoS2 are inactive. We propose the saturation in current to be partly due to limitations associated with transporting charge through the resistive electrode to active sites. We resolve this by fabricating composite electrodes of MoS2 nanosheets mixed with carbon nanotubes. We find both the electrode conductivity and the catalytic current at a given potential to increase with nanotube content as described by percolation theory.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Jonathan N Coleman, Georg S Duesberg, Eoghan O'Malley, Andrew Harvey, Niall McEvoy, Zahra Gholamvand, David McAteer

Experts in our system

1
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
2
Georg Duesberg
Trinity College Dublin
Total Publications: 116
 
3
Andrew Harvey
Trinity College Dublin
Total Publications: 17
 
4
Niall Mcevoy
Trinity College Dublin
Total Publications: 54
 
5
Zahra Gholamvand
Trinity College Dublin
Total Publications: 7
 
6
David McAteer
Trinity College Dublin
Total Publications: 6