Issue 35, 2017

3D walnut-shaped TiO2/RGO/MoO2@Mo electrode exhibiting extraordinary supercapacitor performance

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.

Graphical abstract: 3D walnut-shaped TiO2/RGO/MoO2@Mo electrode exhibiting extraordinary supercapacitor performance

Supplementary files

Article information

Article type
Paper
Submitted
14 Jun 2017
Accepted
10 Aug 2017
First published
10 Aug 2017

J. Mater. Chem. A, 2017,5, 18777-18785

3D walnut-shaped TiO2/RGO/MoO2@Mo electrode exhibiting extraordinary supercapacitor performance

P. Ju, Z. Zhu, X. Shao, S. Wang, C. Zhao, X. Qian and C. Zhao, J. Mater. Chem. A, 2017, 5, 18777 DOI: 10.1039/C7TA05160C

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