Hierarchical hollow MnO2 nanofibers with enhanced supercapacitor performance
Hierarchical hollow MnO2 nanofibers with enhanced supercapacitor performance
复制标题
具有增强超级电容器性能的分层空心MnO2纳米纤维
DOI：
10.1016/j.jcis.2017.11.052
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发表时间：
2018
影响因子：
9.9
通讯作者：
Hu Junqing
中科院分区：
文献类型：
--
作者：
Xu Kaibing;Li Shijie;Yang Jianmao;Hu Junqing
一维空心纳米结构被认为是最具吸引力的超级电容器材料之一。本文以电纺碳纳米纤维作为牺牲模板，通过两步法成功合成了中空二氧化锰纳米纤维。所制得的中空纳米纤维由超薄二氧化锰纳米片组成，可为电化学反应提供丰富的电化学活性位点。重要的是，这些超薄二氧化锰纳米片之间开放和自由的间隙可以显着提高活性材料的利用率，即使在高电流密度下。这种独特的空心纳米结构赋予了空心mno2纳米纤维电极更好的电化学性能，在1 A/g时比电容为291 F/g，优越的倍率能力为~ 73%（从1到10 A/g）， 5000次循环后保持率为90.9%，具有良好的循环稳定性，在储能器件中具有实际应用潜力。
One dimensional (1D) hollow nanostructures have been considered as one of the most fascinating materials for supercapacitors. Herein, the hollow MnO2nanofibers are successfully synthesized through a two-step process, in which the electrospun carbon nanofibers acted as sacrificial template. The resulting hollow nanofibers are composed of ultrathin MnO2nanosheets, which can offer rich electrochemical active sites for electrochemical reactions. Importantly, the open and free interspaces among these ultrathin MnO2nanosheets can significantly enhance the utilization of the active material even at high current density. Such unique hollow nanostructure endow the hollow MnO2nanofibers electrode better electrochemical performance with specific capacitance of 291 F/g at 1 A/g, superior rate capability of ∼73% (from 1 to 10 A/g), and excellent cycling stability of 90.9% retention after 5000 cycles, demonstrating the potential for practical application in energy storage devices.