Synthesizing MnO2 nanosheets from graphene oxide templates for high performance pseudosupercapacitors
Synthesizing MnO2 nanosheets from graphene oxide templates for high performance pseudosupercapacitors
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DOI：
10.1039/c1sc00722j
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发表时间：
2012-01
期刊：
影响因子：
8.4
通讯作者：
Guixia Zhao;Jiaxing Li;Lang Jiang;Huanli Dong;Xiangke Wang;Wenping Hu
中科院分区：
文献类型：
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作者：
Guixia Zhao;Jiaxing Li;Lang Jiang;Huanli Dong;Xiangke Wang;Wenping Hu
以氧化石墨烯为模板，首次发展了一种简便的制备层状锰氧化物纳米片的方法。用共边[MnO 6]八面体原位取代氧化石墨烯骨架上的碳原子，为合成石墨烯基二维纳米材料提供了一种新的方法。氧化石墨烯转化为δ型MnO 2纳米片导致特别高的表面积（157 m2 g−1），这是当今MnO 2纳米材料中的最高值。此外，MnO 2纳米片表现出突出的电容（在3 mV s-1的扫描速率下为1017 F g-1，在5 A g-1的电流密度下为1183 F g-1）和显著的倍率性能（在50 mV s-1的高扫描速率下为1.244 F g-1，在25 A g-1的高电流密度下为1.559 F g-1），表明它们在高能量和功率密度的准超级电容器中的前景。
A facile method to synthesize layered manganese oxide nanosheets was developed for the first time by using graphene oxide as a template. The in situ replacement of carbon atoms on the graphene oxide framework by edge-shared [MnO6] octahedra provides a new methodology to synthesize graphene-based two-dimensional nanomaterials. The transformation of graphene oxide into δ-type MnO2 nanosheets results in an especially high surface area (157 m2 g−1), which is the highest value amongst today's MnO2 nanomaterials. Moreover, the MnO2 nanosheets demonstrated prominent capacitance (∼1017 F g−1 at a scan rate of 3 mV s−1, and ∼1183 F g−1 at a current density of 5 A g−1) and remarkable rate capability (∼244 F g−1 at a high scan rate of 50 mV s−1 and ∼559 F g−1 at a high current density of 25 A g−1), indicating their promise in high energy and power density pseudosupercapacitors.