Superior Oxygen Electrocatalysis on RuSex Nanoparticles for Rechargeable Air Cathodes

Ji Hoon Jang, Eunjik Lee, Penghao Xiao, Kyusung Park, In Young Kim, Graeme Henkelman, Seong Ju Hwang, Young Uk Kwon, John B. Goodenough

Research output: Contribution to journalArticle

8 Citations (Scopus)

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−δ than on a surface layer of RuO2, thereby shifting the more stable adsorbent from Li2O to Li2O2.

Original languageEnglish
Article number1702037
JournalAdvanced Energy Materials
Volume8
Issue number8
DOIs
Publication statusPublished - 2018 Mar 15

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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    Jang, J. H., Lee, E., Xiao, P., Park, K., Kim, I. Y., Henkelman, G., Hwang, S. J., Kwon, Y. U., & Goodenough, J. B. (2018). Superior Oxygen Electrocatalysis on RuSex Nanoparticles for Rechargeable Air Cathodes. Advanced Energy Materials, 8(8), [1702037]. https://doi.org/10.1002/aenm.201702037