多孔Fe_2O_3纳米纤维用于高容量长寿命锂空气电池催化剂

Porous Fe_2O_3 nanofiber catalyst for high-capacity and long-cycle Li-O_2 batteries

采用静电纺丝技术,以乙酰丙酮铁[Fe(C5H7O2)3]、聚乙烯吡咯烷酮(PVP)和二甲基甲酰胺(DMF)为原料,制备了由Fe2O3纳米颗粒组成的高比表面积的多孔纳米纤维,并成功应用于锂氧气电池用催化剂.Fe2O3纳米颗粒为反应提供了充足的活性位点,提高了电池容量;而三维网状结构为反应物及产物提供了足够的反应及储存空间,避免了对电极孔道堵塞的问题,从而达到了锂空气电池长循环的目的.

A high specific surface area of porous nanofibers consisted of Fe2O3 nanoparticles were synthesized via electrospinning technology, using acetylacetone iron （Fe（C5H7O2）3）, polyvinylpyrrolidone （PVP） and dimethyl formamide （DMF） as precursor materials. These nanofibers possess three-dimensional network structure and were successfully used as Li-O2 battery catalyst. Fe2O3 nanoparticles provide abundant catalytic sites and improve the capacity. The three-dimensional network structure offers sufficient room for reactants and products, avoiding clog of the cathode channels and finally achieves a long cycle performance.