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Nonequilibrium Phase Transitions in Amorphous and Anatase TiO2 Nanotubes
- Source :
- ACS Applied Energy Materials. 1:1924-1929
- Publication Year :
- 2018
- Publisher :
- American Chemical Society (ACS), 2018.
-
Abstract
- The electrochemical lithiation/delithiation behavior of self-organized amorphous and anatase titanium dioxide (TiO2) nanotubes (NTs) is analyzed by means of electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The bulk lithiation properties are governed by the different phase transitions in amorphous and anatase TiO2. While in the case of amorphous nanotubes the phase transition only leads to a thermodynamic limitation of the bulk Li content, it additionally limits the lithiation kinetics for the anatase case. This kinetic constraint is found to originate from underlithiation of the anatase TiO2–x bulk caused by the instant first phase transition during lithium insertion. Together with the surface lithiation properties, it leads to different lithiation characteristics. Amorphous nanotubes are characterized by a reversible surface chemistry and thus pseudocapacitive lithiation/delithiation behavior. As a result, amorphous TiO2 nanotubes show higher overall capacities due...
- Subjects :
- Phase transition
Anatase
Materials science
Kinetics
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
0104 chemical sciences
Amorphous solid
Dielectric spectroscopy
chemistry
X-ray photoelectron spectroscopy
Chemical engineering
Materials Chemistry
Chemical Engineering (miscellaneous)
Lithium
Electrical and Electronic Engineering
0210 nano-technology
Subjects
Details
- ISSN :
- 25740962
- Volume :
- 1
- Database :
- OpenAIRE
- Journal :
- ACS Applied Energy Materials
- Accession number :
- edsair.doi...........05cd9ac094d16111906b732a30e3e348