A nano-modified Si/TiO2 composite electrode for efficient solar water splitting

Takabayashi, Susumu; Nakamura, Ryuhei; Nakato, Yoshihiro

doi:10.1016/j.jphotochem.2004.04.037

Cited by 98 publications

(81 citation statements)

References 37 publications

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“…The primary reason is their unique physical and chemical properties compared to bulk materials as well as their potential applications in various technologies including energy conversion. Photoelectrodes based on nanostructured semiconductor materials have been explored for a number of systems, usually single-component nanomaterials such as CdS [79], Bi 2 S 3 [22], Sb 2 S 3 [23], WO 3 [24][25][26][27][28][29][30], ZnO [31][32][33], Fe 2 O 3 [34][35][36], and, more commonly, TiO 2 [13,[37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. Nanomaterials including zerodimensional (0D) nanocrystals and one-dimensional (1D) nanorods and nanotubes offer some potential advantages over their bulk counterparts for photoelectrodes in PEC.…”

Section: Nanomaterials For Pec Water Splittingmentioning

confidence: 99%

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Li¹,

Zhang²

2010

Laser & Photonics Reviews

288

208

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Hydrogen is potentially one of the most attractive and environmentally friendly fuels for energy applications. Safe and efficient generation, storage, and utilization of hydrogen present major challenges in its widespread use. Hydrogen generation from water splitting represents a holy grail in energy science and technology, as water is the most abundant hydrogen source on the Earth. Among different methods, hydrogen generation from photoelectrochemical (PEC) water splitting using semiconductors as photoelectrodes is one of the most scalable and cost-effective approaches. Compared to bulk materials, nanostructured semiconductors offer potential advantages in PEC application due to their large surface area and size-dependent properties, such as increased absorption coefficient, increased band-gap energy, and reduced carrier-scattering rate. This article provides a brief overview of some recent research activities in the area of hydrogen generation from PEC water splitting based on nanostructured semiconductor materials, with a particular emphasis on metal oxides. Both scientific and technical issues are critically analyzed and reviewed.SEM image of ZnO nanowire array on ITO substrate (left) and linear sweep voltammograms from undoped ZnO nanowires in the dark, undoped ZnO nanowires and N-doped ZnO nanowires at 100 mW/cm 2 .

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Section: Nanomaterials For Pec Water Splittingmentioning

confidence: 99%

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Li¹,

Zhang²

2010

Laser & Photonics Reviews

288

208

View full text Add to dashboard Cite

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“…A nanocomposite polycrystalline Si/doped TiO 2 solar water-splitting structure was proposed for high efficiency and low cost by combining the advantages of Si and doped TiO 2 : An n-Si electrode with surface alkylation and metal nanoparticle coating offers an efficient and stable PV characteristic, and TiO 2 doped with other elements, such as nitrogen and sulphur, could induce water photooxidation (oxygen photoevolution) by visible-light illumination. A high solar-tochemical conversion efficiency of more than 10% was predicted for such a system (Takabayashi et al, 2004).…”

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confidence: 97%

Selected nanotechnologies for renewable energy applications

Mao

Chen

2007

Int. J. Energy Res.

163

116

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SUMMARYAs the world faces serious energy challenges, the development and implementation of renewable energy technologies become increasingly important. In this article, we offer a glimpse of the role nanotechnology, in particular, innovations of nanostructures and nanomaterials, is playing in the development of selected renewable energy technologies. These technologies, based on the authors' research interests, include (1) converting the energy of sunlight directly into electricity using solar cells; (2) converting solar energy into hydrogen fuel by splitting water into its constituents; (3) storing hydrogen in solid-state forms; and (4) utilizing hydrogen to generate electricity through the use of fuel cells. It is clear that nanotechnologyenabled renewable energy technologies are starting to scale up dramatically. As they become mature and cost effective in the decades to come, renewable energy could eventually replace the traditional, environmentally unfriendly, fossil fuels. Published in 2007 by John Wiley & Sons, Ltd.

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“…In these cases, the photoanode is composed of a small band gap semiconductor that is protected by a stable semiconductor. [12][13][14] Semiconductor heterojunctions can absorb different region of the solar spectrum. [15][16][17][18] The advantage of composite structures is that each semiconductor need to satisfy one energetic requirement: matching the conduction band minimum (CBM) or VBM with either the H 2 reduction or O 2 oxidation potential.…”

mentioning

confidence: 99%

“…A semiconductor heterojunction of n-Si/n-TiO 2 or p-Si/n-TiO 2 has different band bending properties near the junction. 12,20 The n/n heterojunction has a potential energy barrier between the two semiconductor regions that reflects minority holes in the TiO 2 similar to the back surface field in solar cell. 21 Using photocurrent and open circuit voltage measurements, we show that the n/n heterojunction is more promising for photoelectrochemical (PEC) cell application.…”

mentioning

confidence: 99%

High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity

Hwang¹,

Boukai²,

Yang³

2009

Nano Lett.

550

503

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There are currently great needs to develop low-cost inorganic materials that can efficiently perform solar water splitting as photoelectrolysis of water into hydrogen and oxygen has significant potential to provide clean energy. We investigate the Si/TiO2 nanowire heterostructures to determine their potential for the photooxidation of water. We observed that highly dense Si/TiO2 core/shell nanowire arrays enhanced the photocurrent by 2.5 times compared to planar Si/TiO2 structure due to their low reflectance and high surface area. We also showed that n-Si/n-TiO2 nanowire arrays exhibited a larger photocurrent and open circuit voltage than p-Si/n-TiO2 nanowires due to a barrier at the heterojunction.

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A nano-modified Si/TiO2 composite electrode for efficient solar water splitting

Cited by 98 publications

References 37 publications

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Selected nanotechnologies for renewable energy applications

High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity

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A nano-modified Si/TiO2 composite electrode for efficient solar water splitting

Cited by 98 publications

References 37 publications

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Selected nanotechnologies for renewable energy applications

High Density n-Si/n-TiO2Core/Shell Nanowire Arrays with Enhanced Photoactivity

Contact Info

Product

Resources

About

High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity