Type

Journal Article

Authors

Jonathan N Coleman
Georg S Duesberg
Michael E G Lyons
Aurlie Rovetta
Ian Godwin
Conor Bradley
Damien Hanlon
Nina C Berner
Andrew Harvey
Niall McEvoy
and 3 others

Subjects

Chemistry

Topics
cm 1 hydrogen evolution exfoliated nanosheets liquid metal current density hydrogen production transition metal

Comparison of liquid exfoliated transition metal dichalcogenides reveals MoSe2 to be the most effective hydrogen evolution catalyst. (2016)

Abstract While 2D transition metal dichalcogenides are known to be promising materials for electrocatalysis of hydrogen production, it is not clear which member of this family of materials is the most effective catalyst. Here we perform a comprehensive study, comparing the catalytic performance of electrodes consisting of porous arrays of liquid exfoliated MX2 nanosheets (M = Mo, W; X = S, Se, Te). We find a clear hierarchy with selenides > sulphides > tellurides with MoSe2 clearly out-performing the other materials. In all cases the performance, as characterised by current density at a given potential, can be improved by increasing the number of active sites (via control of the electrode thickness) and/or by adding carbon nanotubes to the electrode (i.e. increasing the electrode conductivity). While all materials formed reasonably stable electrodes, addition of nanotubes tended to improve mechanical cohesion. In an attempt to maximise performance, we prepared thick (∼15 μm), free standing MoSe2/SWNT composite electrodes which displayed Tafel slopes of ∼77 mV per decade and exchange current densities of ∼0.1 mA cm(-2). These electrodes had low onset potentials, reaching -2 mA cm(-2) at -41 mV (vs. RHE) and generated high current densities of -35 mA cm(-2) at -200 mV (vs. RHE).
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Jonathan N Coleman, Georg S Duesberg, Michael E G Lyons, Aurlie Rovetta, Ian Godwin, Conor Bradley, Damien Hanlon, Nina C Berner, Andrew Harvey, Niall McEvoy and 3 others

Experts in our system

1
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
2
Georg Duesberg
Trinity College Dublin
Total Publications: 116
 
3
Michael Lyons
Trinity College Dublin
Total Publications: 41
 
4
Ian Godwin
Trinity College Dublin
Total Publications: 10
 
5
Damien Hanlon
Trinity College Dublin
Total Publications: 13
 
6
Nina C Berner
Trinity College Dublin
Total Publications: 20
 
7
Andrew Harvey
Trinity College Dublin
Total Publications: 17
 
8
Niall Mcevoy
Trinity College Dublin
Total Publications: 54