Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 50, Pages 18060-18065Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201604115
Keywords
cobalt; electrochemistry; energy storage; nanostructures; transition metals
Categories
Funding
- Australian Research Council (ARC) DECRA Grant [DE160100596]
- ARC Discovery Project [DP160102627]
- National Natural Science Foundation of China [21373184]
- Public Projects of Zhejiang Province [2015C31039]
- Fundamental Research Funds for the Central Universities [2016QNA4007, 2016XZZX005-07]
- Opening Project of CAS Key Laboratory of Materials for Energy Conversion [KF2016002]
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Two-dimensional (2D) nanomaterials are one of the most promising types of candidates for energy-storage applications due to confined thicknesses and high surface areas, which would play an essential role in enhanced reaction kinetics. Herein, a universal process that can be extended for scale up is developed to synthesise ultrathin cobalt-/nickel-based hydroxides and oxides. The sodium and lithium storage capabilities of Co3O4 nanosheets are evaluated in detail. For sodium storage, the Co3O4 nanosheets exhibit excellent rate capability (e.g., 179 mA h g(-1) at 7.0 Ag-1 and 150 mA h g(-1) at 10.0 Ag-1) and promising cycling performance (404 mA h g(-1) after 100 cycles at 0.1 Ag-1). Meanwhile, very impressive lithium storage performance is also achieved, which is maintained at 1029 mA h g(-1) after 100 cycles at 0.2 Ag-1. NiO and NiCo2O4 nanosheets are also successfully prepared through the same synthetic approach, and both deliver very encouraging lithium storage performances. In addition to rechargeable batteries, 2D cobalt-/nickel-based hydroxides and oxides are also anticipated to have great potential applications in supercapacitors, electrocatalysis and other energy-storage-/-conversion-related fields.
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