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New Findings from University of St. Andrews in the Area of Chalcogens Reported (Environmental In Situ X-ray Absorption Spectroscopy Evaluation of...

July 29, 2014



New Findings from University of St. Andrews in the Area of Chalcogens Reported (Environmental In Situ X-ray Absorption Spectroscopy Evaluation of Electrode Materials for Rechargeable Lithium-Oxygen Batteries)

By a News Reporter-Staff News Editor at Life Science Weekly -- Fresh data on Chalcogens are presented in a new report. According to news reporting from Fife, United Kingdom, by NewsRx journalists, research stated, "Lithium-oxygen batteries have attracted much recent attention due their high theoretical capacities, which exceeds that of Li-ion batteries. Among all the metal oxides that have been investigated in oxygen cathodes, alpha-MnO2 materials have shown unique electrochemical properties in rechargeable lithium oxygen batteries."

The news correspondents obtained a quote from the research from the University of St. Andrews, "Although extensive research has been performed to investigate the structure of alpha-MnO2 upon lithium intercalation, its behavior upon reacting with lithium under an oxygen environment remains to be fully explored. Here, we performed a systematic study on the behavior of two forms of alpha-MnO2 nanowires (i.e., potassium and ammonia versions) together with bulk alpha-MnO2 in oxygen cathodes through environmental in situ X-ray absorption spectroscopy. The results show that the alpha-MnO2 materials undergo lithium insertion/removal and lithium peroxide formation/decomposition simultaneously. The former causes a self-switching of the oxidation state of Mn during cycling. Additionally, we found that potassium-containing alpha-MnO2 nanowires exhibit a suppression of Mn reduction until late in cell discharge under oxygen, retaining a higher degree of Mn4+. character for enhanced oxygen reduction activity than other, similar alpha-MnO2 materials."

According to the news reporters, the research concluded: "During cell recharge along with oxygen evolution, the materials were found to return to their initial states at low overpotential."

For more information on this research see: Environmental In Situ X-ray Absorption Spectroscopy Evaluation of Electrode Materials for Rechargeable Lithium-Oxygen Batteries. Journal of Physical Chemistry C, 2014;118(24):12617-12624. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry C - www.pubs.acs.org/journal/jpccck)

Our news journalists report that additional information may be obtained by contacting G.S. Hutchings, University of St. Andrews, Sch Chem, St Andrews KY16 9ST, Fife, United Kingdom. Additional authors for this research include J. Rosen, D. Smiley, G.R. Goward, P.G. Bruce and F. Jiao (see also Chalcogens).

Keywords for this news article include: Fife, United Kingdom, Europe, Chalcogens, Emerging Technologies, Nanotechnology, Nanowire

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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