Black Si-doped TiO<sub>2</sub> nanotube photoanode for high-efficiency photoelectrochemical water splitting

Dong, Zhenbiao; Ding, Dongyan; Li, Ting; Ning, Congqin

doi:10.1039/c8ra00021b

Cited by 52 publications

(29 citation statements)

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“…The band gap remains at 1.80 eV for 2%, and increases to 1.86 eV for 3% dopant concentration. This decrease of the band gap is consistent with the observed increase of optical absorption of TNT upon Si doping [35,51,61]. The shift of the Fermi energy is also seen in the Si PDOS, Fig.…”

Section: Optimized Structure and Stability Of Tio 2 Nanotubessupporting

confidence: 88%

Cation Mono‐ and Co‐Doped Anatase TiO₂ Nanotubes: An Ab Initio Investigation of Electronic and Optical Properties

Fadlallah

Eckern

2019

Physica Status Solidi (b)

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The structural, electronic, and optical properties of metal (Si, Ge, Sn, and Pb) mono-and co-doped anatase TiO 2 nanotubes are investigated, in order to elucidate their potential for photocatalytic applications. It is found that Si doped TiO 2 nanotubes are more stable than those doped with Ge, Sn, or Pb. All dopants lower the band gap, the decrease depending on the concentration and the type of dopant. Correspondingly, a redshift in the optical properties for all kinds of dopings is obtained. Even though a Pb mono-doped TiO 2 nanotube has the lowest band gap, this system is not suitable for water splitting, due to the location of the conduction band edge in this system, in contrast to Si, Ge, and Sn mono-doped TiO 2 nanotubes. On the other hand, co-doping of TiO 2 does not improve its photocatalytic properties. Our findings are consistent with recent experiments which show an enhancement of light absorption for Si and Sn doped TiO 2 nanotubes.

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Section: Optimized Structure and Stability Of Tio 2 Nanotubessupporting

confidence: 88%

Cation Mono‐ and Co‐Doped Anatase TiO₂ Nanotubes: An Ab Initio Investigation of Electronic and Optical Properties

Fadlallah

Eckern

2019

Physica Status Solidi (b)

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“…The shift of flat-band potential towards cathodic direction for the pre-illuminated sample was observed. The similar effect was observed for, e.g., reduced TiO 2 nanotubes [43]. Analysis of the Mott-Schottky plot allows the donor density to be determined.…”

Section: Photoelectrochemical Properties and Photointercalated Materisupporting

confidence: 62%

Photoinduced K+ Intercalation into MoO3/FTO Photoanode—the Impact on the Photoelectrochemical Performance

et al. 2019

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In this work, thin layers of MoO 3 were tested as potential photoanodes for water splitting. The influence of photointercalation of alkali metal cation (K +) into the MoO 3 structure on the photoelectrochemical properties of the molybdenum trioxide films was investigated for the first time. MoO 3 thin films were synthesized via thermal annealing of thin, metallic Mo films deposited onto the FTO substrate using a magnetron sputtering system. The Tauc and Mott-Schottky plots analysis were performed in order to determine the energy bands position of the investigated material. The photointercalation effect of K + on photoelectrochemical properties of FTO/MoO 3 photoanodes was studied using electrochemical techniques performed under simulated solar light illumination. It was proven that pristine MoO 3 layers cannot act as effective photoanodes for water splitting due to the utilization of the photoexcited electrons in the intercalation process. The photochromic phenomenon related to Mo 6+ centers reduction, and K + intercalation occurs at a potential range in which the photoanode exhibits photoelectrochemical activity towards water photooxidation.

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“…Peaks at around 531, 532.4, and 533.1 eV are attributed to the Ge−O, Si−O and O−H, respectively. For GeH, Si 6 H 3 (OH) 3 and all gersiloxenes, a same fitted peak located at around 531.7 eV, corresponded to the adsorbed O atoms in the vicinity of oxygen vacancies (Oads), is supposed to be associated with the surface oxygen vacancies 52,53 , which would significantly influence their optical properties.…”

Section: Resultsmentioning

confidence: 98%

Two-dimensional gersiloxenes with tunable bandgap for photocatalytic H2 evolution and CO2 photoreduction to CO

et al. 2020

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The discovery of graphene and graphene-like two-dimensional materials has brought fresh vitality to the field of photocatalysis. Bandgap engineering has always been an effective way to make semiconductors more suitable for specific applications such as photocatalysis and optoelectronics. Achieving control over the bandgap helps to improve the light absorption capacity of the semiconductor materials, thereby improving the photocatalytic performance. This work reports two-dimensional −H/−OH terminal-substituted siligenes (gersiloxenes) with tunable bandgap. All gersiloxenes are direct-gap semiconductors and have wide range of light absorption and suitable band positions for light driven water reduction into H 2 , and CO 2 reduction to CO under mild conditions. The gersiloxene with the best performance can provide a maximum CO production of 6.91 mmol g −1 h −1 , and a high apparent quantum efficiency (AQE) of 5.95% at 420 nm. This work may open up new insights into the discovery, research and application of new two-dimensional materials in photocatalysis.

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Black Si-doped TiO₂ nanotube photoanode for high-efficiency photoelectrochemical water splitting

Cited by 52 publications

References 50 publications

Cation Mono‐ and Co‐Doped Anatase TiO₂ Nanotubes: An Ab Initio Investigation of Electronic and Optical Properties

Cation Mono‐ and Co‐Doped Anatase TiO₂ Nanotubes: An Ab Initio Investigation of Electronic and Optical Properties

Photoinduced K+ Intercalation into MoO3/FTO Photoanode—the Impact on the Photoelectrochemical Performance

Two-dimensional gersiloxenes with tunable bandgap for photocatalytic H2 evolution and CO2 photoreduction to CO

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Black Si-doped TiO2 nanotube photoanode for high-efficiency photoelectrochemical water splitting

Cited by 52 publications

References 50 publications

Cation Mono‐ and Co‐Doped Anatase TiO2 Nanotubes: An Ab Initio Investigation of Electronic and Optical Properties

Cation Mono‐ and Co‐Doped Anatase TiO2 Nanotubes: An Ab Initio Investigation of Electronic and Optical Properties

Photoinduced K+ Intercalation into MoO3/FTO Photoanode—the Impact on the Photoelectrochemical Performance

Two-dimensional gersiloxenes with tunable bandgap for photocatalytic H2 evolution and CO2 photoreduction to CO

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Black Si-doped TiO₂ nanotube photoanode for high-efficiency photoelectrochemical water splitting

Cation Mono‐ and Co‐Doped Anatase TiO₂ Nanotubes: An Ab Initio Investigation of Electronic and Optical Properties

Cation Mono‐ and Co‐Doped Anatase TiO₂ Nanotubes: An Ab Initio Investigation of Electronic and Optical Properties