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physical Chemistry
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- Posted by Milton Bertrand
- December 19, 2014
- 2 comments
- 0 endorses
- 4,012 views
In everyday life, the global positioning system can be employed to reliably determine the momentary location of one en route to the desired destination. Scientists have now developed a molecular 'GPS' with which the whereabouts of metal ions in enzymes... moreIn everyday life, the global positioning system can be employed to reliably determine the momentary location of one en route to the desired destination. Scientists have now developed a molecular 'GPS' with which the whereabouts of metal ions in enzymes can be reliably determined. Such ions play important roles in all corners of metabolism and synthesis for biological products.
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- Posted by Milton Bertrand
- October 4, 2014
- 0 comments
- 0 endorses
- 4,406 views
Abstract from Nature: With a high theoretical specific energy, the non-aqueous rechargeable lithium–oxygen battery is a promising next-generation energy storage technique. However, the large charging overpotential remains a challenge due to the... moreAbstract from Nature: With a high theoretical specific energy, the non-aqueous rechargeable lithium–oxygen battery is a promising next-generation energy storage technique. However, the large charging overpotential remains a challenge due to the difficulty in electrochemically oxidizing the insulating ​lithium peroxide. Recently, a redox shuttle has been introduced into the electrolyte to chemically oxidize ​lithium peroxide. Here, we report the use of a ​triiodide/iodide redox shuttle to couple a built-in dye-sensitized ​titanium dioxide photoelectrode with the oxygen electrode for the photoassisted charging of a lithium–oxygen battery. On charging under illumination, ​triiodide ions are generated on the photoelectrode, and subsequently oxidize ​lithium peroxide. Due to the contribution of the photovoltage, the charging overpotential is greatly reduced. The use of a redox shuttle to couple a photoelectrode and an oxygen electrode offers a unique... less
