Preparation of Nb2O5 with an air filter-like structure and its excellent electrochemical performance in supercapacitors

Preparation of Nb2O5 with an air filter-like structure and its excellent electrochemical performance in supercapacitors
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具有空气过滤器结构的Nb2O5的制备及其在超级电容器中的优异电化学性能

DOI:
10.1016/j.jallcom.2019.06.191
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发表时间:
2019-09
影响因子:
6.2
通讯作者:
Chen Han
Chen Han
中科院分区:
材料科学2区
文献类型:
--
作者:
Liu Jingqiang;Xiang Kaixiong;Zhou Wei;Zhu Yirong;Xiao Li;Chen Wenhao;Chen Han

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用水热法合成了一种结构类似空气滤清器的Nb2O5化合物(AF-Nb2O5),并进一步焙烧形成了CaF-Nb2O5。用X射线衍射仪、扫描电子显微镜和透射电子显微镜对AF-Nb_2O_5和CaF-Nb_2O_5的形貌和微观结构进行了研究。AF-Nb2O5和CaF-Nb2O5具有相似的滤膜结构,由规则的孔道和有序的网络组成。CaF-Nb2O5在0.5 A g−1电流密度下的比电容为2 5 8 F g−1,在5 A g−1的大电流密度下的倍率容量为172 F g−1,在2 A g−1的电流密度下循环5000次后的容量保持率为90.5%。
A Nb2O5compound with a structure similar to an air filter (AF-Nb2O5) was synthesized using a hydrothermal method, and further calcined to form a product that was designated CAF-Nb2O5. The morphology and microstructure of the AF-Nb2O5and CAF-Nb2O5were examined using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The AF-Nb2O5and CAF-Nb2O5exhibited similar filter-like structures, which consisted of regular pores and ordered networks. The CAF-Nb2O5exhibited a high specific capacitance of 258 F g−1at a current density of 0.5 A g−1, an excellent rate capacity of 172 F g−1at the high current density of 5 A g−1and an impressive capacitance retention of 90.5% after 5000 cycles at the current density of 2 A g−1. The CAF-Nb2O5exhibited excellent electrochemical properties by virtue of its abundance of ion channels and its filter-like structure.
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