Oxygen vacancies and phase tuning of self-supported black TiO2-X nanotube arrays for enhanced sodium storage

Chen, Jun; Fu, Yanlong; Sun, Fuming; Hu, Zhengguang; Wang, Xing; Zhang, Ting; Zhang, Feng-Shou; Wu, Xiaoling; Chen, Haisheng; Cheng, Guoan; Zheng, Ruiting

doi:10.1016/j.cej.2020.125784

Cited by 47 publications

(25 citation statements)

References 56 publications

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“…Moreover, the N 2 -900°C sample only shows the surface-exposed oxygen defect signal, and no latticeembedded oxygen defect signal can be detected in the EPR spectra. Because the initial TNTAs are amorphous, the generation of a different defect state under a different annealing temperature may be caused by simultaneous phase transition and oxygen defect generation, which has been verified in our previous work [33]. A higher annealing temperature will accelerate crystallization in the embedded lattice, and oxygen atoms will be fixed in the embedded lattice more quickly to avoid oxygen defect generation in bulk in the initial annealing stage [34].…”

Section: Resultsmentioning

confidence: 51%

“…4(h) shows the CV curves of the N 2 -600°C TNTAs at 0.1, 0.2, 0.5, 1, 2, and 5 mV s À1 . It is well known that the CV curve represents the total charge storage capacity of a TiO 2 anode-based LIB, which can be divided into contributions from the diffusion-controlled capacity and surface-dominated pseudo-capacity by Dunn's method [33]. The measured current and scan rate satisfy Eq.…”

Section: Resultsmentioning

confidence: 99%

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Tunable oxygen defect density and location for enhancement of energy storage

Sun

Lin

et al. 2021

Journal of Energy Chemistry

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Section: Resultsmentioning

confidence: 51%

Section: Resultsmentioning

confidence: 99%

Tunable oxygen defect density and location for enhancement of energy storage

Sun

Lin

et al. 2021

Journal of Energy Chemistry

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“…As shown in Fig. 4a, for 800℃-H-TiO 2 , a small peak at g=2.005 indicated the generation of a small number of V O [24,31], while the spectrum of white TiO 2 with few crystal defects appeared horizontal. This result explained the variation in bandgaps and absorbance from white TiO 2 to 800℃-H-TiO 2 .…”

Section: Resultsmentioning

confidence: 94%

Highly stable visible‐light photocatalytic properties of black rutile TiO2 hydrogenated in ultrafast flow

Gao

Zhang

Huang

et al. 2021

J Mater Sci: Mater Electron

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The hydrogenation and introducing oxygen vacancies (V O ) can lead to surface lattice-disorder in TiO 2 , which is a new form of TiO 2 named black TiO 2 , with excellent visible-light photocatalytic activity, but this TiO 2 is easy to failure because oxidation makes the concentration of surface V O decrease rapidly in a short time. In this work, black TiO 2 nanoparticles with V O almost concentrated inside nanoparticles were fabricated under ultrafast hydrogen ow. These bulk V O shortened the bandgaps of black TiO 2 , enhanced its visible light absorption, and meanwhile provided extremely strong stability. A series of characterization methods con rmed the location of V O , and degradation experiments on Cr 6+ or rhodamine B demonstrated the good visible-light photocatalytic performance of our material. After 18 months of natural aging treatment (in the air), our samples showed no discoloration and maintained 89.5% photocatalytic e ciency, and further study exhibited that this black TiO 2 also contained excellent acidresistance and moderate alkaline-resistance. This work could help design lattice-disorder to obtain more stable and practical black TiO 2 .

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“…Thermal annealing of the TiO 2 nanotubes in a N 2 atmosphere could realize the controllability of OVs by tuning the annealing temperature. 62 It is found that a sample synthesized at 600 C showed the highest surface OV concentration in the TiO 2 nanotubes and delivered the best Na ion storage performance. The presence of OVs also effectively enhanced the electronic conductivity and reduced the Na ion insertion energy barrier.…”

Section: Introductionmentioning

confidence: 94%

“…Metal oxides, such as titanium dioxide (TiO 2 ), [59][60][61][62][63] tin dioxide (SnO 2 ), 64,65 vanadium oxide (V 2 O 5 ), 66 and sodium titanate (Na 2 Ti 3 O 7 ) 67,68 are promising anode candidates for NIBs. For example, TiO 2 has merits of excellent cycling stability and low cost.…”

Section: Introductionmentioning

confidence: 99%