Design of two kinds of branched TiO2 nano array photoanodes and their comparison of photoelectrochemical performances

Zhang, Shengsen; Wang, Xiu‐Jie; Hu, Jian; Xie, Zhikun; Lei, Hougen; Peng, Feng

doi:10.1016/j.electacta.2017.08.164

Cited by 20 publications

(8 citation statements)

References 27 publications

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“…Obviously, branched TiO 2 NRAs exhibited lower reflectance as compared to the pure TiO 2 NRAs. The branched nanorod structure with higher surface roughness can increase the incident light scattering path, and result in the reflectivity reduction of branched NRAs [ 29 , 30 ]. However, it was also noticed that the branched TiO 2 NRAs had lower absorption than that of TiO 2 NRAs at the wavelength range from 510 nm to 700 nm even though the surface area increased, which can be ascribed to the light scattering effect from the increased surface roughness of the branched geometric structure [ 12 , 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photoelectrochemical Properties of Ti3+ Self-Doped Branched TiO2 Nanorod Arrays with Visible Light Absorption

Wang

Yan

et al. 2018

Materials

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A novel Ti3+ self-doped branched rutile TiO2 nanorod arrays (NRAs) was successfully grown on an F-doped tin oxide (FTO) transparent conductive glass by a combined hydrothermal and magnetron sputtering method. Surface morphology, structure, optical properties, and photoelectrochemical behavior of the branched TiO2 NRAs are determined. Using TiO2 nanoparticles (NPs) deposited on the top of the nanorods as seeds, TiO2 nanobranches can easily grow on the top of the nanorods. Moreover, the Ti3+ defects in the TiO2 NPs and associated oxygen vacancies, and the nanobranches expend the optical absorption edge of the TiO2 NRAs from 400 nm to 510 nm. Branched TiO2 NRAs exhibit excellent photoelectrochemical properties compared to the pure TiO2 NRAs, as revealed by photoelectrochemical measurements. This enhanced photoelectrochemical properties is induced by the increased surface area and expanded optical absorption range. Due to their favorable characteristics, these novel branched TiO2 NRAs will provide a new path to the fabrication of hierarchical nanostructured materials.

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Section: Resultsmentioning

confidence: 99%

Enhanced Photoelectrochemical Properties of Ti3+ Self-Doped Branched TiO2 Nanorod Arrays with Visible Light Absorption

Wang

Yan

et al. 2018

Materials

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“…[107] The branches in anatase phase show 2.7 times of H 2 evolution rate higher than that of rutile branches covered TiO 2 nanorod within illumination. [108] Hydrogen treatment on TiO 2 is an effective strategy to create extra energy levels of oxygen vacancy and Ti 3+ lying between CB and VB of TiO 2 . [109,110] Disordered structure of anatase/rutile branches induced by hydrogenation exhibits highly sensitive to irradiation lights and efficient charge separation, attributing to the extra energy levels induced additional charge carriers and anatase/rutile phase heterojunction generated strong built-in electric field.…”

Section: Charge Transfer In 1d Tio 2 Combined 1d Photoabsorbers Constmentioning

confidence: 99%

Interfacial Charge Transport in 1D TiO₂ Based Photoelectrodes for Photoelectrochemical Water Splitting

Liu

et al. 2019

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1D nanostructured photoelectrodes are promising for application as photoelectrochemical (PEC) devices for solar energy conversion into hydrogen (H2) owing to the optical, structural, and electronic advantages. Titanium dioxide (TiO2) is the most investigated candidate as a photoelectrode due to its good photostability, low production cost, and eco‐friendliness. The obstacle for TiO2's practical application is the inherent wide bandgap (UV‐lights response), poor conductivity, and limited hole diffusion length. Here, a comprehensive review of the current research efforts toward the development of 1D TiO2 based photoelectrodes for heterogeneous PEC water splitting is provided along with a discussion of nanoarchitectures and energy band engineering influences on interfacial charge transfer and separation of 1D TiO2 composited with different dimensional photoactive materials. The key focus of this review is to understand the charge transfer processes at interfaces and the relationship between photogenerated charge separation and photoelectrochemical performance. It is anticipated that this review will afford enriched information on the rational designs of nanoarchitectures, doping, and heterojunction interfaces for 1D TiO2 based photoelectrodes to achieve highly efficient solar energy conversion.

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“…In this vein, we have investigated hybrid photoanodes based on nanocrystalline TiO 2 electron collector modified with polymeric carbon nitride ("CN x ," also called polyheptazine or, more precisely, poly(aminoimino)heptazine or melon, a polymeric s-heptazine derivative, also referred to as "graphitic carbon nitride" or "g-C 3 N 4 " in the literature) (Wang et al, 2010), coupled with IrO x , CoO(OH) x or NiO x cocatalysts (Bledowski et al, 2012(Bledowski et al, , 2013(Bledowski et al, , 2014, Wang et al, 2017Mei et al, 2013;Khavryuchenko et al, 2015;Longchin et al, 2020). Such hybrid electrodes can be readily prepared by depositing CN x into a mesoporous TiO 2 anatase film on fluorine-doped tin oxide (FTO) glass by chemical vapor deposition from urea pyrolysis products.…”

Section: Introductionmentioning

confidence: 99%

“…When used as the substrate for the immobilization of other photoactive materials (e.g., CN x ), the small surface area is disadvantageous. Thus, many investigations have been done to modify the surface of RNRs and enlarge the surface area (Cho et al, 2011;Ye et al, 2013;Guo et al, 2014;Zhang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Anatase-Wrapped Rutile Nanorods as an Effective Electron Collector in Hybrid Photoanodes for Visible Light-Driven Oxygen Evolution

et al. 2021

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Arrays of single crystal TiO2 rutile nanorods (RNRs) appear highly promising as electron-collecting substrates in hybrid photoanodes as the RNRs offer direct charge carriers transport pathways, contrary to the conventional electrodes prepared from TiO2 powders that suffer from the numerous charge traps at the grain boundaries. However, the specific surface area of the nanorods is highly limited by their smooth morphology, which might be detrimental in view of utilizing the RNR as a substrate for immobilizing other functional materials. In this study, we developed a novel anatase-wrapped RNR (ARNR) material fabricated by a facile seed layer-free hydrothermal method. The ARNR comprises polycrystalline anatase nanoparticles formed on the surface of RNR, resulting in a large surface area that provides more deposition sites compared to the bare nanorods. Herein, we functionalize ARNR and RNR electrodes with polymeric carbon nitride (CNx) coupled with a CoO(OH)x cocatalyst for dioxygen evolution. The anatase wrapping of the rutile nanorod scaffold is found to be crucial for effective deposition of CNx and for improved photoanode operation in visible light-driven (λ > 420 nm) oxygen evolution, yielding a significant enhancement of photocurrent (by the factor of ∼3.7 at 1.23 V vs. RHE) and faradaic efficiency of oxygen evolution (by the factor of ∼2) as compared to photoanodes without anatase interlayer. This study thus highlights the importance of careful interfacial engineering in constructing photoelectrocatalytic systems for solar energy conversion and paves the way for the use of ARNR-based electron collectors in further hybrid and composite photochemical architectures for solar fuel production.

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Design of two kinds of branched TiO2 nano array photoanodes and their comparison of photoelectrochemical performances

Cited by 20 publications

References 27 publications

Enhanced Photoelectrochemical Properties of Ti3+ Self-Doped Branched TiO2 Nanorod Arrays with Visible Light Absorption

Enhanced Photoelectrochemical Properties of Ti3+ Self-Doped Branched TiO2 Nanorod Arrays with Visible Light Absorption

Interfacial Charge Transport in 1D TiO₂ Based Photoelectrodes for Photoelectrochemical Water Splitting

Anatase-Wrapped Rutile Nanorods as an Effective Electron Collector in Hybrid Photoanodes for Visible Light-Driven Oxygen Evolution

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Design of two kinds of branched TiO2 nano array photoanodes and their comparison of photoelectrochemical performances

Cited by 20 publications

References 27 publications

Enhanced Photoelectrochemical Properties of Ti3+ Self-Doped Branched TiO2 Nanorod Arrays with Visible Light Absorption

Enhanced Photoelectrochemical Properties of Ti3+ Self-Doped Branched TiO2 Nanorod Arrays with Visible Light Absorption

Interfacial Charge Transport in 1D TiO2 Based Photoelectrodes for Photoelectrochemical Water Splitting

Anatase-Wrapped Rutile Nanorods as an Effective Electron Collector in Hybrid Photoanodes for Visible Light-Driven Oxygen Evolution

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Interfacial Charge Transport in 1D TiO₂ Based Photoelectrodes for Photoelectrochemical Water Splitting