Journal
CHEMPLUSCHEM
Volume 82, Issue 2, Pages 295-302Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201600463
Keywords
electrochemistry; nanoparticles; supercapacitors; synthesis design; transition metals
Categories
Funding
- Australian Research Council
- Science and Technology Program of Guangzhou, China [201607010110]
- Science and Technology Planning Project of Guangdong Province, China [2016A010104014]
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Nanoflower-like architectures represent a unique type of nano-materials in which thin 2D nanosheets are self-organised into interconnected structures. Lack of restacking between nanosheets and significant internal porosity are the particular advantages of such nanoscale architectures. A general method for the preparation of nanoflowers of a range of oxides (e.g., FeTiO3, TiO2, Mn2O3) through a two-step procedure of ball milling and subsequent hydrothermal treatment is outlined. Importantly, the synthetic method is valid not only for a single oxide, but is extendable to a family of oxide materials. It is established that the formation of the nanoflowers from ball-milled powders follows a dissolution-precipitation mechanism; this is confirmed by inductively coupled plasma time of flight mass spectrometry measurements. Additional information on the X-ray photoelectron spectroscopy characterisation and intermediate stage of growth of the nanostructures is included. Furthermore, two applications of Mn2O3 nanostructures are briefly investigated. Firstly, their properties for energy storage in the electrodes of electrochemical supercapacitors are presented. A capacitive response in the potential window of -0.1-0.9 V versus an Ag/AgCl reference electrode is observed, with an associated increase of the capacitance values over cycling. Secondly, the use of Mn2O3 nanoflowers as model systems for the development of novel nanofabrication techniques (such as nanopatterning with a He+ beam) is investigated.
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