Branched multiphase TiO2 with enhanced photoelectrochemical water splitting activity

Liu, Xu; Cao, Xiangkun Elvis; Liu, Ya; Li, Xiaobing; Wang, Meng; Li, Mingtao

doi:10.1016/j.ijhydene.2018.09.193

Cited by 26 publications

(8 citation statements)

References 79 publications

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“…Meanwhile, the cross-sectional image (inset of Figure 1(c)) reveals that this sample has a smoother surface in contrast to the earlier sample, where some Ag NCs are successfully diffused through the bundle gap among the NTs and are attached onto the walls at one-third of the overall height from the top of NTs. In comparison to the existing study [26,27], the NT bundles appear to be much more loosely packed to each other.…”

Section: Morphological Study (Fesem)contrasting

confidence: 87%

Photodeposition of Ag Nanocrystals onto TiO₂ Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production

Jani

Haw

Chiu

et al. 2020

Journal of Nanomaterials

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Current work reports the study of Ag nanocrystals (NCs) decorated doubly anodized (DA) TiO2 nanotubes (NTs) thin film as an efficient photoelectrode material for water splitting and photocatalytic hydrogen gas production. DA process has been shown to be capable of producing less defective NTs and creating additional spacious gaps in between NT bundles to allow efficient and uniform integration of Ag NCs. By employing photoreduction method, Ag NCs can be deposited directly onto NTs, where the size and density of coverage can be maneuvered by merely varying the concentration of Ag precursors. Field emission scanning electron microscope (FESEM) images show that the Ag NCs with controllable size are homogeneously decorated onto the walls of NTs with random yet uniform distribution. X-ray diffraction (XRD) results confirm the formation of anatase TiO2 NTs and Ag NCs, which can be well indexed to standard patterns. The decoration of metallic Ag NCs onto the surface of NTs demonstrates a significant enhancement in the photoconversion efficiency as compared to that of pristine TiO2 NTs. Additionally, the as-prepared nanocomposite film also shows improved efficiency when used as a photocatalyst platform in the production of hydrogen gas. Such improvement in the performance of water splitting and photocatalytic hydrogen gas production activity can be credited to the surface plasmonic resonance of Ag NCs present on the surface of the NTs, which renders improved light absorption and better charge separation. The current work can serve as a model of study for designing more advanced nanoarchitecture photoelectrode for renewable energy application.

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Section: Morphological Study (Fesem)contrasting

confidence: 87%

Photodeposition of Ag Nanocrystals onto TiO₂ Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production

Jani

Haw

Chiu

et al. 2020

Journal of Nanomaterials

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“…As discussed, although there are several options in order to dope TiO 2 with metals and non-metals, the research community has devoted much energy to improving the characteristics of TiO 2 photocatalysts through appropriate synthesis conditions. It is possible to achieve improved mechanical strength, enhanced composite stability, surface area, roughness, and fill factor for TiO 2 by using branched multiphase TiO 2 [ 162 ].…”

Section: Experimental Researchmentioning

confidence: 99%

TiO2 as a Photocatalyst for Water Splitting—An Experimental and Theoretical Review

et al. 2021

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Hydrogen produced from water using photocatalysts driven by sunlight is a sustainable way to overcome the intermittency issues of solar power and provide a green alternative to fossil fuels. TiO2 has been used as a photocatalyst since the 1970s due to its low cost, earth abundance, and stability. There has been a wide range of research activities in order to enhance the use of TiO2 as a photocatalyst using dopants, modifying the surface, or depositing noble metals. However, the issues such as wide bandgap, high electron-hole recombination time, and a large overpotential for the hydrogen evolution reaction (HER) persist as a challenge. Here, we review state-of-the-art experimental and theoretical research on TiO2 based photocatalysts and identify challenges that have to be focused on to drive the field further. We conclude with a discussion of four challenges for TiO2 photocatalysts—non-standardized presentation of results, bandgap in the ultraviolet (UV) region, lack of collaboration between experimental and theoretical work, and lack of large/small scale production facilities. We also highlight the importance of combining computational modeling with experimental work to make further advances in this exciting field.

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“…TiO 2 shows a stable photocurrent density of 60 mA cm À2 at 1.23 V vs. RHE (0.8 V vs. Ag/AgCl). The cathodic photocurrents ranging from À240 mA cm À2 to À2.45 mA cm À2 at 0 V vs. RHE for anodized Cu 2 O NWs 23,24,27,31,59-62 and anodic photocurrents ranging from 20 mA cm À2 to 0.5 mA cm À2 at 1.23 V vs. RHE for hydrothermally grown TiO 2 NRs, [63][64][65][66][67][68][69][70] have been reported in the literature. Nevertheless, our main goal in this paper is to demonstrate and establish unassisted Z-scheme solar water splitting in tandem conguration.…”

Section: Resultsmentioning

confidence: 92%

Photoelectrochemical study of carbon-modified p-type Cu₂O nanoneedles and n-type TiO_2−x nanorods for Z-scheme solar water splitting in a tandem cell configuration

Kaneza

Shinde

et al. 2019

RSC Adv.

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Branched multiphase TiO2 with enhanced photoelectrochemical water splitting activity

Cited by 26 publications

References 79 publications

Photodeposition of Ag Nanocrystals onto TiO₂ Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production

Photodeposition of Ag Nanocrystals onto TiO₂ Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production

TiO2 as a Photocatalyst for Water Splitting—An Experimental and Theoretical Review

Photoelectrochemical study of carbon-modified p-type Cu₂O nanoneedles and n-type TiO_2−x nanorods for Z-scheme solar water splitting in a tandem cell configuration

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Branched multiphase TiO2 with enhanced photoelectrochemical water splitting activity

Cited by 26 publications

References 79 publications

Photodeposition of Ag Nanocrystals onto TiO2 Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production

Photodeposition of Ag Nanocrystals onto TiO2 Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production

TiO2 as a Photocatalyst for Water Splitting—An Experimental and Theoretical Review

Photoelectrochemical study of carbon-modified p-type Cu2O nanoneedles and n-type TiO2−x nanorods for Z-scheme solar water splitting in a tandem cell configuration

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Product

Resources

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Photodeposition of Ag Nanocrystals onto TiO₂ Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production

Photodeposition of Ag Nanocrystals onto TiO₂ Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production

Photoelectrochemical study of carbon-modified p-type Cu₂O nanoneedles and n-type TiO_2−x nanorods for Z-scheme solar water splitting in a tandem cell configuration