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Träfflista för sökning "WFRF:(Jonsson Erlendur 1983) srt2:(2019)"

Sökning: WFRF:(Jonsson Erlendur 1983) > (2019)

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1.
  • Halat, David M., et al. (författare)
  • Natural abundance solid-state S-33 NMR study of NbS3: applications for battery conversion electrodes
  • 2019
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1364-548X .- 1359-7345. ; 55:84, s. 12687-12690
  • Tidskriftsartikel (refereegranskat)abstract
    • We report ultra-wideline, high-field natural abundance solid-state S-33 NMR spectra of the Li-ion battery conversion electrode NbS3, the first S-33 NMR study of a compound containing disulfide (S-2(2-)) units. The large quadrupolar coupling parameters (C-Q approximate to 31 MHz) are consistent with values obtained from DFT calculations, and the spectra provide evidence for the linear Peierls distortion that doubles the number of S-33 sites.
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2.
  • Liu, Tao, et al. (författare)
  • Understanding LiOH Formation in a Li-O2 Battery with LiI and H2O Additives
  • 2019
  • Ingår i: ACS Catalysis. - : American Chemical Society (ACS). - 2155-5435. ; 9:1, s. 66-77
  • Tidskriftsartikel (refereegranskat)abstract
    • LiI-promoted LiOH formation in Li-O2 batteries with wet ether electrolytes has been investigated by Raman, nuclear magnetic resonance spectroscopy, operando pressure tests, and molecular dynamics simulations. We find that LiOH formation is a synergistic effect involving both H2O and LiI additives, whereas with either alone Li2O2 forms. LiOH is generated via a nominal four-electron oxygen reduction reaction, the hydrogen coming from H2O and the oxygen from both O2 and H2O, and with fewer side reactions than typically associated with Li2O2 formation; the presence of fewer parasitic reactions is attributed to the proton donor role of water, which can coordinate to O2- and the higher chemical stability of LiOH. Iodide plays a catalytic role in decomposing H2O2/HO2- and thereby promoting LiOH formation, its efficacy being highly dependent on the water concentration. This iodide catalysis becomes retarded at high water contents due to the formation of large water-solvated clusters, and Li2O2 forms again.
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  • Resultat 1-2 av 2

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