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      All-Solid-State, Foldable, and Rechargeable Zn-Air Batteries Based on Manganese Oxide Grown on Graphene-Coated Carbon Cloth Air Cathode

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          Recent advances in zinc-air batteries.

          Zinc-air is a century-old battery technology but has attracted revived interest recently. With larger storage capacity at a fraction of the cost compared to lithium-ion, zinc-air batteries clearly represent one of the most viable future options to powering electric vehicles. However, some technical problems associated with them have yet to be resolved. In this review, we present the fundamentals, challenges and latest exciting advances related to zinc-air research. Detailed discussion will be organized around the individual components of the system - from zinc electrodes, electrolytes, and separators to air electrodes and oxygen electrocatalysts in sequential order for both primary and electrically/mechanically rechargeable types. The detrimental effect of CO2 on battery performance is also emphasized, and possible solutions summarized. Finally, other metal-air batteries are briefly overviewed and compared in favor of zinc-air.
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            Metal-Air Batteries with High Energy Density: Li-Air versus Zn-Air

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              Exfoliation of layered double hydroxides for enhanced oxygen evolution catalysis.

              The oxygen evolution reaction is a key reaction in water splitting. The common approach in the development of oxygen evolution catalysts is to search for catalytic materials with new and optimized chemical compositions and structures. Here we report an orthogonal approach to improve the activity of catalysts without alternating their compositions or structures. Specifically, liquid phase exfoliation is applied to enhance the oxygen evolution activity of layered double hydroxides. The exfoliated single-layer nanosheets exhibit significantly higher oxygen evolution activity than the corresponding bulk layered double hydroxides in alkaline conditions. The nanosheets from nickel iron and nickel cobalt layered double hydroxides outperform a commercial iridium dioxide catalyst in both activity and stability. The exfoliation creates more active sites and improves the electronic conductivity. This work demonstrates the promising catalytic activity of single-layered double hydroxides for the oxygen evolution reaction.
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                Author and article information

                Contributors
                Journal
                Advanced Energy Materials
                Adv. Energy Mater.
                Wiley
                16146832
                October 2017
                October 2017
                July 14 2017
                : 7
                : 20
                : 1700927
                Affiliations
                [1 ]Institute of Materials Research and Engineering (IMRE); A*STAR (Agency for Science, Technology and Research); 2 Fusionopolis Way, Innovis #08-03 Singapore 138634 Republic of Singapore
                [2 ]Department of Chemistry; University College London; 20 Gordon Street London WC1H 0AJ UK
                Article
                10.1002/aenm.201700927
                bda4dc13-58f6-4f1d-8052-2632b293303c
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1.1

                http://onlinelibrary.wiley.com/termsAndConditions#vor

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