pn Heterojunctions in NiO:TiO2 composites with type-II band alignment assisting sunlight driven photocatalytic H2 generation

Rawool, Sushma A.; Pai, Mrinal R.; Banerjee, Atindra Mohan; Arya, A.; Ningthoujam, R. S.; Tewari, R.; Rao, Rekha; Chalke, Bhagyashree A.; Ayyub, Pushan; Tripathi, A. K.; Bharadwaj, S.R.

doi:10.1016/j.apcatb.2017.09.004

Cited by 177 publications

(61 citation statements)

References 64 publications

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“…It is well known that titanium dioxide and nickel oxide are N-type and P-type semiconductors respectively, and the inner electric field may be constructed when TiO2 couples with NiO [11,12]. The inner electric field is helpful to separate the photogenerated electron-hole pairs on the surface of TiO2, thereby suppressing the recombination of electron-hole pairs and improving the photocatalytic performance.…”

Section: Introduction mentioning

confidence: 99%

The Effects of the Content of NiO on the Microstructure and Photocatalytic Activity of the NiO/TiO2 Composite Film

Zhang¹,

Tang²,

Chen³

et al. 2018

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The NiO/TiO2 composite films with the NiO content of 3 %, 5 %, 10 %, 13 %, 15 % and 20 % were prepared by mechanical coating technology and subsequent oxidation process. The composition and microstructure of the films were analyzed by X-ray Diffraction (XRD), scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS). The photocatalytic activity was evaluated and the effects of the content of NiO on microstructure and photocatalytic activity of the films were studied. The results show that NiO particles are dispersed in the Ti coatings, and the NiO concentration in the inner layer of the coatings is higher than in the outer layer. With the addition of NiO in the NiO/Ti coating, the ductility is deteriorated and the thickness is reduced of the NiO/Ti coatings. The films with NiO/TiO2/Ti composite microstructure are obtained by the oxidation of NiO/Ti coatings. Photocatalytic efficiency of the films is obviously enhanced with the help of the p-n junction heterostructure in the NiO/TiO2 films. The optimum content of NiO is about 13 %, and the degradation rate of methyl orange solution reaches the maximum value of 88.44 %.

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Section: Introduction mentioning

confidence: 99%

The Effects of the Content of NiO on the Microstructure and Photocatalytic Activity of the NiO/TiO2 Composite Film

Zhang¹,

Tang²,

Chen³

et al. 2018

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“…GaN) n /(AlN) n (n = 10, 12, 14)[66] as well as nanocomposites of Carbon-ZrO 2[67] , NiO:TiO 2[68] and Fe 2 O 3 -Cr 2 O 3 systems[69][70][71].For the band gap reduction with the increasing layer number of BFO or BCO, the lattice strain induced by the lattice mismatch between BFO and BCO may be one of the reasons responsible for that. In order to explore how the lattice strain influences the band gap, we investigate the band gap of BFO and BCO within 2 % tensile and compressive strain, respectively.…”

mentioning

confidence: 99%

Band-Gap Reduction in (BiCrO3)m/(BiFe
Zhang
¹
,
Xiao
²
,
Peng
³

et al. 2018
Phys. Rev. Applied
41
2
15
0
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is promising for photovoltaic applications, especially in regard to the exploitation of ferroelectric photovoltaic effects for charge separation. However, its large band gap limits efficient sunlight absorption. Here, we demonstrate a new strategy to effectively tune the band gap of tetragonal BiFeO 3 via superlattice 2 structuring with the ferroelectric BiCrO 3. The (BiCrO 3) m /(BiFeO 3) n superlattices are found to exhibit conventional ferroelectric properties, but low fundamental band gaps, smaller than either of the parent materials. First-principles calculations reveal that the unexpected band-gap reduction is induced by charge reconstruction due to lattice strain, octahedral distortion, and polarization discontinuity at the BiCrO 3-BiFeO 3 interfaces. Ultimately, these results provide a new strategy, in the form of superlattice structuring, which could open the door to the creation of efficient ferroelectric photovoltaics.

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“…Under full-spectrum illumination, electrons can absorb energy in NiO and NiTiO 3 , moving from the valence band to the conduction band with a corresponding number of holes generated in the valence band. At the p-n heterojunction interface of NiO and NiTiO 3 , the boundary potential of the NiO conduction band (−1.23 eV vs. NHE) is lower than that of NiTiO 3 (0.23 eV vs. NHE) [35,36], resulting in easy transfer of photogenerated electrons from the conduction band of NiO to the conduction band position of NiTiO 3 . This phenomenon can encourage in situ absorption of oxygen to generate superoxide radicals, O 2 − [37][38][39].…”

Section: Photocatalytic Performance and Photocatalytic Mechanismmentioning

confidence: 99%

Photocatalytic Performance of NiO/NiTiO3 Composite Nanofiber Films

et al. 2019

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Photocatalytic degradation of pollutants is one of the cleanest technologies for environmental remediation. Herein, we prepared NiO/NiTiO3 heterostructure nanofiber (200 nm) films by electrospinning and high temperature heat treatment, using nickel acetate and tetrabutyltitanate as nickel and titanium sources, respectively. The NiO/NiTiO3 heterostructure has advantages of good photodegradation rate constant and stability. By controlling the temperature, we can optimize the phase composition of these nanofibers for better photocatalytic performance. Based on our findings of the Rhodamine B degradation results, the best performance was obtained with 10% NiO and 90% NiTiO3; 92.9% of the Rhodamine B (5 mg/L) was degraded after reaction under full spectrum irradiation for 60 min. More importantly, the repeating test showed that these nanofiber films can remain active and stable after multiple cycles. The mechanisms of the photocatalysis reactions were also discussed. This demonstration provides a guideline in designing a new photocatalyst that we hope will serve the environmental needs for this and the coming century.

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pn Heterojunctions in NiO:TiO2 composites with type-II band alignment assisting sunlight driven photocatalytic H2 generation

Cited by 177 publications

References 64 publications

The Effects of the Content of NiO on the Microstructure and Photocatalytic Activity of the NiO/TiO2 Composite Film

The Effects of the Content of NiO on the Microstructure and Photocatalytic Activity of the NiO/TiO2 Composite Film

Band-Gap Reduction in (BiCrO3)m/(BiFe
Zhang
¹
,
Xiao
²
,
Peng
³

et al. 2018
Phys. Rev. Applied
41
2
15
0
View full text Add to dashboard Cite

Photocatalytic Performance of NiO/NiTiO3 Composite Nanofiber Films

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pn Heterojunctions in NiO:TiO2 composites with type-II band alignment assisting sunlight driven photocatalytic H2 generation

Cited by 177 publications

References 64 publications

The Effects of the Content of NiO on the Microstructure and Photocatalytic Activity of the NiO/TiO2 Composite Film

The Effects of the Content of NiO on the Microstructure and Photocatalytic Activity of the NiO/TiO2 Composite Film

Band-Gap Reduction in (BiCrO3)m/(BiFeZhang1, Xiao2, Peng3 et al. 2018Phys. Rev. Applied412150View full textAdd to dashboardCite

Photocatalytic Performance of NiO/NiTiO3 Composite Nanofiber Films

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Band-Gap Reduction in (BiCrO3)m/(BiFe
Zhang
¹
,
Xiao
²
,
Peng
³

et al. 2018
Phys. Rev. Applied
41
2
15
0
View full text Add to dashboard Cite