Type

Journal Article

Authors

Colm O'Dwyer
Hugh Geaney
Gillian Collins
Nerino Penazzi
Silvia Bodoardo
Juqin Zeng
Julia Amici
Carlotta Francia
Svetoslava Vankova

Subjects

Chemistry

Topics
nanoparticles reaction ruthenium lithium life cycle oxygen batteries evolution

Influence of binders and solvents on stability of Ru/RuOx nanoparticles on ITO nanocrystals as Li–O2 battery cathodes (2017)

Abstract Fundamental research on Li–O2 batteries remains critical, and the nature of the reactions and stability are paramount for realising the promise of the Li–O2 system. We report that indium tin oxide (ITO) nanocrystals with supported 1–2 nm oxygen evolution reaction (OER) catalyst Ru/RuOx nanoparticles (NPs) demonstrate efficient OER processes, reduce the recharge overpotential of the cell significantly and maintain catalytic activity to promote a consistent cycling discharge potential in Li–O2 cells even when the ITO support nanocrystals deteriorate from the very first cycle. The Ru/RuOx nanoparticles lower the charge overpotential compared with those for ITO and carbon-only cathodes and have the greatest effect in DMSO electrolytes with a solution-processable F-free carboxymethyl cellulose (CMC) binder (<3.5 V) instead of polyvinylidene fluoride (PVDF). The Ru/RuOx/ITO nanocrystalline materials in DMSO provide efficient Li2O2 decomposition from within the cathode during cycling. We demonstrate that the ITO is actually unstable from the first cycle and is modified by chemical etching, but the Ru/RuOx NPs remain effective OER catalysts for Li2O2 during cycling. The CMC binders avoid PVDF-based side-reactions and improve the cyclability. The deterioration of the ITO nanocrystals is mitigated significantly in cathodes with a CMC binder, and the cells show good cycle life. In mixed DMSO–EMITFSI [EMITFSI=1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide] ionic liquid electrolytes, the Ru/RuOx/ITO materials in Li–O2 cells cycle very well and maintain a consistently very low charge overpotential of 0.5–0.8 V.
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Full list of authors on original publication

Colm O'Dwyer, Hugh Geaney, Gillian Collins, Nerino Penazzi, Silvia Bodoardo, Juqin Zeng, Julia Amici, Carlotta Francia, Svetoslava Vankova

Experts in our system

1
Colm O'Dwyer
University College Cork
Total Publications: 121
 
2
Hugh Geaney
University College Cork
Total Publications: 33
 
3
Gillian Collins
University College Cork
Total Publications: 22
 
4
Silvia Bodoardo
University College Cork
Total Publications: 3
 
5
Julia Amici
University College Cork
Total Publications: 3
 
6
Carlotta Francia
University College Cork
Total Publications: 3