Details

Autor(en) / Beteiligte

• Guo, Xiaolong
• Wang, Tian
• Zheng, Tian Xu
• Xu, Chaohe
• Zhang, Jintao
• Zhang, Yu Xin
• Liu, Xiao Ying
• Dong, Fan

Titel

Quasi-parallel arrays with a 2D-on-2D structure for electrochemical supercapacitorsElectronic supplementary information (ESI) available. See DOI: 10.1039/c8ta07869f

Erscheinungsjahr

2018-12

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Construction of two-dimensional nanostructured arrays is important to improve the specific capacitance and rate performance of supercapacitors. In this work, we demonstrate a novel type of pseudocapacitive NiMn oxide@MnO 2 quasi-parallel array assembled via 2D-on-2D structures. The quasi-parallel arrays markedly reduce the "dead area" caused by the bending stack of traditional 2D assembled structures, which obviously increases the number of active sites of the MnO 2 electrode. The small aspect ratio of the quasi-parallel arrays ensures mechanical adhesion and electrical connection between the active material and the current collector. Therefore, the NiMn oxide@MnO 2 arrays exhibit outstanding pseudocapacitive performance, including high specific capacitance (801 F g −1 at 1 A g −1 , capacity: 151.3 mAh g −1 ), long-term cycling stability, and outstanding rate capability (79% capacitance retention rate at 40 A g −1 ). The constructed asymmetric supercapacitor based on a NiMn oxide@MnO 2 cathode and an activated graphene anode exhibits extraordinary cyclic stability (96% capacitance retention after 10 000 cycles). This new type of quasi-parallel array could become a versatile electrode platform, which would open up a wide range of applications in supercapacitors, batteries and electrocatalysis. We demonstrate a novel type of pseudocapacitive NiMn oxide@MnO 2 quasi-parallel array assembled via 2D-on-2D structures.