Facile synthesis of Fe@Fe2O3 core-shell nanowires as O2 electrode for high-energy Li-O2 batteries
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Fe@Fe2O3 core-shell nanowires were synthesized via the reduction of Fe3+ ions by sodium borohydride in an aqueous solution with a subsequent heat treatment to form Fe2O3 shell and employed as a cathode catalyst for non aqueous Li-air batteries. The synthesized core-shell nanowires with an average diameter of 50–100 nm manifest superior catalytic activity for oxygen evolution reaction (OER) in Li-O2 batteries with the charge voltage plateau reduced to ∼3.8 V. An outstanding performance of cycling stability was also achieved with a cutoff specific capacity of 1000 milliampere hour per gram over 40 cycles at a current density of 100 mA g−1. The excellent electrochemical properties of Fe@Fe2O3 as an O2 electrode are ascribed to the high surface area of the nanowires’ structure and high electron conductivity. This study indicates that the resulting iron-containing nanostructures are promising catalyst in Li-O2 batteries.
KeywordsLithium-oxygen batteries; Fe@Fe2O3 Core-shell nanowires Catalyst Reduction reaction
The authors highly acknowledge Prof. B. V. R. Chowdari (National University of Singapore) for his helpful discussions and the financial support from Natural Science Foundation of China (NSFC, Project No. 51432010 and No. 51272267) and Science and Technology Commission of Shanghai Municipality (14JC1493000 and 15DZ2281200).
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