3D walnut-shaped TiO2/RGO/MoO2@Mo electrode exhibiting extraordinary supercapacitor performance. Issue 35 (23rd August 2017)

• Record Type: Journal Article
• Authors: Ju, Peiwen; Zhu, Zhaoqiang; Shao, Xiaoxiao; Wang, Shengqi; Zhao, Chunhua; Qian, Xiuzhen; Zhao, Chongjun
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 35(2017)
• Page Start: 18777
• Page End: 18785
• Publication Date: 2017-08-23
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta05160c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : 3D hierarchical walnut-shaped TiO2 /RGO/MoO2 @Mo negative electrode delivered extraordinary performances of 3927 mF cm −2 areal capacitance and 3.5% capacitance loss after 5000 cycles. Abstract : Rational architectural design is the key to improve specific capacitance. Herein, we present a facile one-step hydrothermal process for the fabrication of a TiO2 /RGO/MoO2 composite with an unprecedented 3D walnut-shaped hierarchical nanostructure, in which amorphous TiO2 is decorated on the RGO (reduced graphene oxide)/MoO2 surface via a Mo-involved in situ growth route on Mo net (TiO2 /RGO/MoO2 @Mo). This 3D structure coated with ultrafine arched nanorods is a great breakthrough in electrochemical performances of TiO2 – or MoO2 -based electrodes as it exhibits an extraordinary areal capacitance of 3927 mF cm −2 at 3 mA cm −2 ( i.e. 1636 F g −1 at 1.25 A g −1 ) with only 3.5% capacitance loss after 5000 cycles. Such an excellent performance is benefitted from the following factors: (i) amorphous TiO2 sculptured MoO2 blocky particles supply more active-site accessibility and facilitate the accommodation of volume expansion. (ii) Arched MoO2 nanorods as well as the walnut-shaped spheres of the composite provide electron transfer paths. (iii) RGO is a soft scaffold, which relieves the volume expansion during the charge/discharge processes.