期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 2, 页码 1794-1803出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b02238
关键词
Mn-doped NiMoO4; reduced graphene oxide; flexibility; all-solid-state; supercapacitor
资金
- National Natural Science Foundation of China [21978026, 51572036, 51472035]
- Changzhou Key Laboratory of Graphene-Based Materials for Environment and Safety [CM20153006, CE20185043]
- PAPD of Jiangsu Higher Education Institution
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJKY19_0317]
Mn-doping has great influence on the structural and electrical properties of NiMoO4, which plays an important role in determining its electrochemical activities. In this work, Mn-doped NiMoO4 was prepared. Structural characterization and theoretical calculation reveal that Mn-doped NiMoO4 (Mn0.1Ni0.9MoO4) has smaller unit cell parameters and is more reactive than NiMoO4 because of the defects produced by Mn-doping. On the basis of that, we prepared a composite consisting of Mn0.1Ni0.9MoO4 mesoporous nanorods and reduced graphene oxide (Mn0.1Ni0.9MoO4/rGO), which was assembled into a symmetrical all-solid-state device as electrode material, with alkaline poly(vinyl alcohol) as solid-state electrolyte. The device shows a good specific capacitance of 109.3 F.g(-1) at 1 A.g(-1) in a rather wide voltage range of 0-1.8 V, exhibits an excellent cycling stability with 96.1% of the capacitance retained after 200 cycles, and delivers a high energy density of 49.2 Wh.kg(-1) at 1800 W.kg(-1). The all-solid-state supercapacitor owns superior flexibility and maintains 83.6% of its initial specific capacitance under the bent condition. When tested in a three-electrode system, the Mn0.1Ni0.9MoO4/rGO composite exhibits a maximum specific capacitance of 688.9 F.g(-1) at 0.5 A.g(-1) that is much better than NiMoO4 and Mn0.1Ni0.9MoO4. The results show that the Mn0.1Ni0.9MoO4/rGO composite stands out as a kind of transition-metal-doped electrode material for flexible all-solid-state supercapacitors.
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