Journal
CHEMICAL ENGINEERING JOURNAL
Volume 338, Issue -, Pages 55-61Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.01.024
Keywords
Nickel aluminum-layered double hydroxide; Sol-gel process; Asymmetric supercapacitors; Energy storage materials
Categories
Funding
- National Key Research and Development Program [2016YFB0901600]
- NSFC [21303162, 11604295]
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In this study, Ni-Al layered double hydroxide (NiAl-LDH) hollow microspheres with a high surface area and large pore volume were prepared using Al2O3 hollow microspheres composed of Al2O3 nanosheets as templates. During a mild microwave-assisted hydrothermal process, the Al2O3 nanosheets transformed to NiAl-LDH nanosheets without any damage to the assembled hollow spherical structure. The as-prepared NiAl-LDH hollow microspheres exhibited a high specific capacitance (1578F g(-1) at a current density of 1 A g(-1)) and good cycling performance (capacitance retention of 93.75% after 10,000 cycles). Moreover, an asymmetric supercapacitor was successfully assembled using the synthesized hollow microspheres as the positive electrode and activated carbon nanofibers as the negative electrode. The supercapacitor device achieved a relatively high energy density and power density (energy densities of 20 Wh kg(-1) and 6.6 Wh kg(-1) at power densities of 0.75 kW kg(-1) and 11.25 kW kg(-1), respectively).
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