Facile synthesis and electrochemical properties of MnO2/carbon nanotubes--颗粒学报PARTICUOLOGY

Lv, Y., Li, H., Xie, Y., Li, S., Li, J., Xing, Y., & Song, Y. (2014). Facile synthesis and electrochemical properties of MnO2/carbon nanotubes. Particuology, 15, 34–38. https://doi.org/10.1016/j.partic.2012.12.006

Facile synthesis and electrochemical properties of MnO₂/carbon nanotubes

Yang Lv ^{a b}, Huanqiao Li ^b, Yan Xie ^b, Shushuang Li ^b, Jia Li^{b c}, Yongheng Xing ^a *, Yujiang Song ^b

a College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China
b Dalian National Laboratories for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
c Dalian University of Technology, Dalian 116024, China

10.1016/j.partic.2012.12.006

Volume 15, August 2014, Pages 34-38

Received 3 November 2012, Revised 14 December 2012, Accepted 28 December 2012, Available online 5 March 2013.

E-mail: yhxing2000@yahoo.com

Highlights

► A facile route to synthesize MnO₂/MWCNTs was devised in aqueous solution under ambient conditions.

► Composite of MWCNTs loaded with 20 wt%MnO₂ nanosheets has a high specific capacitance of 234 F/g.

► 80% of the initial capacitance of the MnO₂/MWCNTs (20 wt%) is maintained after 1000 charge–discharge cycles.

Abstract

The poor electrical conductivity of MnO₂ limits its use as an electrode material. To overcome this limitation, we report an easy and rapid approach to deposit nanosized MnO₂ onto multi-wall carbon nanotubes functionalized with hydroxyl groups (MWCNTs-OH) by chemical reduction of KMnO₄ with MnSO₄ in aqueous solution under ambient conditions. Characterization with XRD and TEM reveals that the obtained MnO₂/MWCNTs-OH composite is nanocrystalline and partially covered by MnO₂ nanosheets with a thickness of 1–3 nm at a MnO₂ loading of 20 wt%. Cyclic voltammetry (CV) and galvanostatic charge–discharge measurements reveal that the MnO₂/MWCNTs-OH composite with a MnO₂ loading of 20 wt% has a relatively high specific capacitance of 234 F/g at a scan rate of 2 mV/s and exhibits good cycling stability. Furthermore, the oxygen reduction reaction (ORR) shows that MnO₂/MWCNTs-OH composite may have potential applications as a non-noble metal electrocatalyst in fuel cells and metal–air batteries.

Graphical abstract

Keywords

MnO₂; MWCNTs-OH; Supercapacitor; Non-noble metal electrocatalyst

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