Facile synthesis and self-assembly of hierarchical porous NiO nano/micro spherical superstructures for high performance supercapacitors
Top Cited Papers
- 10 June 2009
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 19 (32), 5772-5777
- https://doi.org/10.1039/b902221j
Abstract
We report a practical and efficient strategy for synthesizing hierarchical (meso- and macro-)porous NiO nano/micro spherical superstructures. First, β-Ni(OH)2 microspheres were self-assembled based on the coalescence and Ostwald-ripening mechanisms during refluxing in an alkaline solution with Ni(NH3)x 2+ at 97 °C for 1 h under vigorous stirring. Second, hierarchical porous NiO microsphere superstructures were obtained from the precursor by a simple calcination procedure. The resulting superstructures comprised two-dimensional mesoporous NiO petal building blocks. Electrochemical data demonstrated that the hierarchical porous NiO nano/micro superstructures were capable of delivering a specific capacitance of 710 F g−1 at 1 A g−1 and offered a good specific capacitance retention of ca. 98% after 2000 continuous charge-discharge cycles. This indicates that we successfully met key requirements in terms of large specific energy density, high-rate capability and good electrochemical stability. We would expect our superstructures to be good candidates for a low-cost replacement for the state-of-the-art supercapacitor material RuO2.Keywords
This publication has 27 references indexed in Scilit:
- Synthesis and utilization of RuO2·xH2O nanodots well dispersed on poly(sodium 4-styrene sulfonate) functionalized multi-walled carbon nanotubes for supercapacitorsJournal of Materials Chemistry, 2008
- Synthesis of Ordered Mesoporous NiO with Crystalline Walls and a Bimodal Pore Size DistributionJournal of the American Chemical Society, 2008
- NiO loaded on hydrothermally treated mesocarbon microbeads (h-MCMB) and their supercapacitive behaviorsSolid State Ionics, 2008
- Electrochemical capacitance of NiO/Ru0.35V0.65O2 asymmetric electrochemical capacitorJournal of Power Sources, 2007
- Textural and Capacitive Characteristics of Hydrothermally Derived RuO2·xH2O Nanocrystallites: Independent Control of Crystal Size and Water ContentChemistry of Materials, 2007
- Electrochemical capacitance characterization of NiO with ordered mesoporous structure synthesized by template SBA-15Electrochimica Acta, 2006
- Synthesis and electrochemical properties of mesoporous nickel oxideJournal of Power Sources, 2004
- A Study of the Preparation of NiO[sub x] Electrode via Electrochemical Route for Supercapacitor Applications and Their Charge Storage MechanismJournal of the Electrochemical Society, 2002
- A Chemical Synthesis of Periodic Macroporous NiO and Metallic NiAdvanced Materials, 1999
- Porous Nickel Oxide/Nickel Films for Electrochemical CapacitorsJournal of the Electrochemical Society, 1996