Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 606, Issue -, Pages 1652-1661Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.08.140
Keywords
NiMoO4; RGO; Micro-architecture; Stability; Supercapacitors
Categories
Funding
- National Natural Science Foundation of China [22078028, 21978026]
- Changzhou Key Laboratory of Graphene-Based Materials for Environment and Safety [CM20153006, CE20185043]
- PAPD of Jiangsu Higher Education Institution, and Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX20-0954, KYCX20-2564]
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The NiMoO4-Ag/rGO composite with a 3D hydrangea-like micro-architecture and Ag nanoparticles shows a high specific capacitance and excellent cycling performance, making it a promising electrode material for supercapacitors.
It is a great challenge to design electrode materials with good stability and high specific capacitance for supercapacitors. Herein, a three-dimensional (3D) hydrangea-like NiMoO4 micro-architecture with Ag nanoparticles anchored on the surface has been designed by adding EDTA-2Na, which was assembled with reduced graphene oxide (rGO) and named as NiMoO4-Ag/rGO composite. Benefiting from the synergetic contributions of structural and componential properties, NiMoO4-Ag/rGO composite exhibits a high specific capacitance of 566.4 C g(-1) at 1 A g(-1), and great cycling performance with 90.5% capacitance retention after 1000 cycles at 10 A g(-1). The NiMoO4-Ag/rGO electrode shows an enhanced cycling stability due to the two-dimensional towards two-dimensional (2D-2D) interface coupling between rGO and NiMoO4 nanosheets, and the stable 3D hydrangea-like micro-architecture. Moreover, NiMoO4-Ag/rGO with 5-15 nm pore structure and enhanced conductivity exhibits improved charge transfer and ions diffusion. Besides, NiMoO4-Ag/rGO//AC capacitor displays an outstanding energy density of 40.98 Wh kg(-1) at 800 kW kg(-1), and an excellent cycling performance with 73.3% capacitance retention at 10 A g(-1) after 8000 cycles. The synthesis of NiMoO4-Ag/rGO composite can provide an effective strategy to solve the poor electrochemical stability and slow electron/ion transfer of NiMoO4 material as supercapacitors electrode. (C) 2021 Published by Elsevier Inc.
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