Issue 48, 2018

Quasi-parallel arrays with a 2D-on-2D structure for electrochemical supercapacitors

Abstract

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@MnO2 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 MnO2 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@MnO2 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@MnO2 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.

Graphical abstract: Quasi-parallel arrays with a 2D-on-2D structure for electrochemical supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
14 Aug 2018
Accepted
26 Sep 2018
First published
26 Sep 2018

J. Mater. Chem. A, 2018,6, 24717-24727

Quasi-parallel arrays with a 2D-on-2D structure for electrochemical supercapacitors

X. Guo, T. Wang, T. X. Zheng, C. Xu, J. Zhang, Y. X. Zhang, X. Y. Liu and F. Dong, J. Mater. Chem. A, 2018, 6, 24717 DOI: 10.1039/C8TA07869F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements