Journal ArticleDOI
Electronic structure of TiO2nanotube arrays from X-ray absorption near edge structure studies
Jigang Zhou,Hai-Tao Fang,Jason Maley,M. W. Murphy,J. Y. Peter Ko,J. N. Cutler,Ramaswami Sammynaiken,T. K. Sham,Meijin Liu,Fangsen Li +9 more
TLDR
In this article, an X-ray absorption near edge structure (XANES) investigation of several TiO2nanotube arrays, including the as-prepared and the annealed ATNTA, was performed.Abstract:
We report an X-ray absorption near edge structure (XANES) investigation of several TiO2nanotube arrays, including the as-prepared nanotube arrays from electrochemical anodic oxidation of Ti foil (as-prepared ATNTA), as-prepared nanotube arrays after annealing at 580 °C (annealed ATNTA) and annealed ATNTA after electrochemical intercalation with Li (Li-intercalated ATNTA). XANES at the O K-edge and Ti L3,2 and K edges shows distinctly different spectral features for the as-prepared and the annealed ATNTA, characteristic of amorphous and anatase structures, respectively. Intercalation of Li into annealed ATNTA induces a surprising, yet spectroscopically unmistakable, anatase to rutile transition. XANES at the Li K-edge clearly shows ionic features of Li in ATNTA. The charge relocation from Ti 3d to O 2p at the conduction band in TiO2 was also observed when Li ions were intercalated into annealed ATNTA albeit no noticeable reduction of Ti4+ to Ti 3+ was observed. The O K-edge shows a distinctly enhanced feature in the multiple scattering regime, indicating a close to linear O–Li–O arrangement in Li-intercalated ATNTA. These results show bonding changes between Ti and O resulting from the interaction of Li ions in the TiO2 lattices. Such bonding variation has also been supported by X-ray excited optical luminescence (XEOL), which suggests Li+-defect interactions. The implications of these results are discussed.read more
Citations
More filters
Journal ArticleDOI
Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction
TL;DR: The Co₃O₄/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions, making it a high-performance non-precious metal-based bi-catalyst for both ORR and OER.
Journal ArticleDOI
Strongly coupled inorganic/nanocarbon hybrid materials for advanced electrocatalysis.
TL;DR: Recent efforts in developing strongly coupled inorganic/nanocarbon hybrid materials to improve the electrocatalytic activities and stability of inorganic metal oxides, hydroxides, sulfides, and metal-nitrogen complexes are presented.
Journal ArticleDOI
Three‐Dimensional Self‐Supported Metal Oxides for Advanced Energy Storage
TL;DR: Current strategies for the design and morphology control of self-supported electrodes fabricated using template, lithography, anodization and self-organized solution techniques are outlined along with different efforts to improve the storage capacity, rate capability, and cyclability.
Journal ArticleDOI
Probing the Optical Property and Electronic Structure of TiO2 Nanomaterials for Renewable Energy Applications
TL;DR: Probing the Optical Property and Electronic structure of TiO2 Nanomaterials for Renewable Energy Applications and its applications in renewable energy applications is studied.
Journal ArticleDOI
The discharge rate capability of rechargeable Li–O2 batteries
Yi-Chun Lu,David G. Kwabi,Koffi P. C. Yao,Jonathon R. Harding,Jigang Zhou,Lucia Zuin,Yang Shao-Horn +6 more
TL;DR: In this paper, the discharge rate capability of Au-catalyzed Vulcan carbon and pure Vulcan carbon (VC) as the O2electrode was studied in the range of 100 to 2000 mA gcarbon−1.
References
More filters
Journal ArticleDOI
Visible-Light Photocatalysis in Nitrogen-Doped Titanium Oxides
TL;DR: Film and powders of TiO2-x Nx have revealed an improvement over titanium dioxide (TiO2) under visible light in optical absorption and photocatalytic activity such as photodegradations of methylene blue and gaseous acetaldehyde and hydrophilicity of the film surface.
Journal ArticleDOI
Use of highly-ordered TiO(2) nanotube arrays in dye-sensitized solar cells.
TL;DR: Voltage-decay measurements indicate that the highly ordered TiO(2) nanotube arrays, in comparison to nanoparticulate systems, have superior electron lifetimes and provide excellent pathways for electron percolation.
Journal ArticleDOI
Novel Carbon-Doped TiO2 Nanotube Arrays with High Aspect Ratios for Efficient Solar Water Splitting
TL;DR: The preparation of vertically grown carbon-doped TiO(2) (TiO( 2-x)C(x) nanotube arrays with high aspect ratios for maximizing the photocleavage of water under white-light irradiation showed much higher photocurrent densities and more efficient water splitting under visible-light illumination than pure TiO (2) nanOTube arrays.
Journal ArticleDOI
Enhanced Photocleavage of Water Using Titania Nanotube Arrays
TL;DR: It is demonstrated that the wall thickness and length of the nanotubes can be controlled via anodization bath temperature and this hydrogen generation rate is the highest reported for a titania-based photoelectrochemical cell.