Hydrogenated Oxygen-Deficient Blue Anatase as Anode for High-Performance Lithium Batteries

Abstract

Blue oxygen-deficient nanoparticles of anatase TiO2 (H-TiO2) are synthesized using a modified hydrogenation process. Scanning electron microscope and transmission electron microscope images clearly demonstrate the evident change of the TiO2 morphology, from 60 nm rectangular nanosheets to much smaller round or oval nanoparticles of ∼17 nm, after this hydrogenation treatment. Importantly, electron paramagnetic resonance and positronium annihilation lifetime spectroscopy confirm that plentiful oxygen vacancies accompanied by Ti(3+) are created in the hydrogenated samples with a controllable concentration by altering hydrogenation temperature. Experiments and theory calculations demonstrate that the well-balanced Li(+)/e(-) transportation from a synergetic effect between Ti(3+)/oxygen vacancy and reduced size promises the optimal H-TiO2 sample a high specific capacity, as well as greatly enhanced cycling stability and rate performance in comparison with the other TiO2.

Defect-engineered TiO2 Hollow Spiny Nanocubes for Phenol Degradation under Visible Light Irradiation

“…The binding energies of Ti 2p 3/2 and Ti 2p 1/2 which can be detected at ~458.6 eV and ~464.5 eV, respectively, are typical for Ti 4+ species in TiO 2 12 , 28 . Additionally, the almost identical Ti 2p spectra of RHT and HT and the absence of any Ti 3+ signals 30 suggests that no titanium with lower oxidation states were observed on the surface of RHT samples (Fig. 7a ).…”

Solution combustion synthesis of crystalline V2O3 and amorphous V2O3/C as anode for lithium‐ion battery

“…29 The existence of oxygen vacancies can promote the energetics for ion and electron transport, and preserve the integrity of the sample surface morphology. [30][31][32] The peak intensity increased along with the increase in glucose additive amount, indicating that the oxygen vacancy content in the amorphous sample was much larger than that in the crystalline sample.…”

Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation

“…Among the narrow band gap semiconductors, cadmium based chalcogenides showed effective photocatalytic‐to‐hydrogen fuel generation compared to metal oxides as it possess high photo absorption in visible spectrum . In this line, cadmium selenide (CdSe) is a promising visible light driven semiconductor photocatalyst material have suitable energy gap and band edge potentials for H 2 generation via water splitting . Cadmium selenide conduction band reduction potential lies between −0.27 eV to −1.26 eV and valence band oxidation potential is +0.7 eV to +1.42 eV, that fulfil the basic requirement of overall water splitting reactions.…”