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Superior Oxygen Electrocatalysis on RuSex Nanoparticles for Rechargeable Air Cathodes

Title
Superior Oxygen Electrocatalysis on RuSex Nanoparticles for Rechargeable Air Cathodes
Authors
Jang, Ji-HoonLee, EunjikXiao, PenghaoPark, KyusungKim, In YoungHenkelman, GraemeHwang, Seong-JuKwon, Young-UkGoodenough, John. B.
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2018
Journal Title
ADVANCED ENERGY MATERIALS
ISSN
1614-6832JCR Link

1614-6840JCR Link
Citation
ADVANCED ENERGY MATERIALS vol. 8, no. 8
Keywords
electrocatalystsLi-O-2 batteriesoxygen evolution reactionoxygen reduction reactionruthenium selenide
Publisher
WILEY-V C H VERLAG GMBH
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
A one-step, facile supercritical-ethanol-fluid synthesis of Se-modified Ru nanoparticles nucleated on carbon defects is reported, and it is demonstrated that these nanoparticles provide, with >70% efficiency at 1 A g(-1), a highly active and reversible oxygen-reduction/oxygen-evolution reaction on an air cathode in a nonaqueous electrolyte. The Se modification not only prevents Ru oxidation during charge/discharge cycling, but also improves the catalytic activity by promoting Li2O2 versus Li2O deposited on the Ru particles during discharge. A computational calculation with density functional theory supports the role of a larger electron transfer to the oxygen of Li2O2 adsorbed on a surface layer of RuSe2- than on a surface layer of RuO2, thereby shifting the more stable adsorbent from Li2O to Li2O2.
DOI
10.1002/aenm.201702037
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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