The Effect of Rapid Temperature Annealing with N2and H2on Photoelectrochemical Properties of u-TiO2

Bae, Hyojung; Park, Seung-Hwan; Nakamura, Akihiro; Koike, Kayo; Fujii, K.; Park, Hyung-Jo; Lee, Hyojong; Oh, Tae-Sung; Ha, Jun‐Seok

doi:10.1149/2.009311jes

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…Bae et al reported the effect of H 2 and N 2 annealing on significant increase of the photocurrent of annealed Nb-doped TiO 2 [25]. Hall-effect measurements, Photoluminescence (PL), and ultravioletevisible (UVeVis) spectrometry confirmed that the annealing process improved the photocurrent by decreasing the carrier concentration to achieve wider depletion region, the recombination level, and the bandgap energy.…”

Section: Doping With Metal Ionsmentioning

confidence: 99%

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Recent progress in enhancing solar-to-hydrogen efficiency

Chen

Yang

Song

et al. 2015

Journal of Power Sources

119

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h i g h l i g h t sRecent progress in enhancing solar-to-hydrogen (STH) efficiency is reviewed. Light absorption, charge separation-migration and surface reaction are evaluated. Doping, quantum dot, and plasmon enhancement are the keys to high STH efficiency. Co-catalysts and nanostructured surfaces improve surface reactions effectively. Multiple excitons, upconversion, and synergic strategies are promising areas. a b s t r a c tSolar water splitting is a promising and ideal route for renewable production of hydrogen by using the most abundant resources of solar light and water. Focusing on the working principal of solar water splitting, including photon absorption and exciton generation in semiconductor, exciton separation and transfer to the surface of semiconductor, and respective electron and hole reactions with absorbed surface species to generate hydrogen and oxygen, this review covers the comprehensive efforts and findings made in recent years on the improvement for the solar-to-hydrogen efficiency (STH) determined by a combination of light absorption process, charge separation and migration, and catalytic reduction and oxidation reactions. Critical evaluation is attempted on the strategies for improving solar light harvesting efficiency, enhancing charge separation and migration, and improving surface reactions. Towards the end, new and emerging technologies for boosting the STH efficiency are discussed on multiple exciton generation, up-conversion, multi-strategy modifications and the potentials of organometal hybrid perovskite materials.

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Section: Doping With Metal Ionsmentioning

confidence: 99%

“…However, the formation of strongly localized d states within the bandgap and the existence of carrier recombination centers significantly decrease the carrier mobility and then reduce the photocurrent [25].…”

Section: Co-dopingmentioning

confidence: 99%

Recent progress in enhancing solar-to-hydrogen efficiency

Chen

Yang

Song

et al. 2015

Journal of Power Sources

119

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“…17 Creating intrinsic defects such as oxygen vacancies is a novel approach for modifying the metal oxide's optical and electrical properties by increasing donor densities. [18][19][20] There are several methods to introduce the oxygen vacancies in transition metal oxides, including hydrogenation, [21][22][23][24][25][26] thermal annealing in oxygen-deficient environment, [27][28][29] electrochemical reduction, [30][31][32] chemical reduction, 33,34 partial oxidation, 35,36 and flamereduction method. [37][38][39][40] Khan et al 38 synthesized the TiO 2 by flame-treatment of titanium metal substrates using natural gas.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical properties of butane reduced flame‐treated Zr‐doped hematite thin films

2022

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In this research, Zr‐doped hematite thin films were prepared by a simple and highly scalable liquid phase deposition method, and their photoelectrochemical (PEC) properties were investigated. The samples were post‐heat treated using a butane reduced flame. PEC studies revealed that both Zr‐doping and flame‐treatment enhanced the performance of the hematite photoanodes. The photocurrent densities of the samples were considerably increased upon flame‐treatment, that is, about 3.5 times for a 4% Zr‐doped sample. The highest photocurrent density at 1.23 V versus reversible hydrogen electrode (RHE) was obtained, about 0.50 mA cm−2 for the 4% Zr‐doped sample, about five times higher than the undoped sample. The Mott–Schottky measurements revealed that the donor charge carrier density for the 4% Zr‐doped sample was increased fivefold upon flame‐treatment from 2.49 × 1019 to 1.38 × 1020 cm−3. The optical investigations showed that the optical band gap energy values depend on the level of Zr‐doping, and the sample with 4% Zr‐doping showed the lowest band gap energy value, about 1.82 eV. The mechanism behind the effectiveness of the flame‐treatment was investigated and attributed to the oxygen vacancy formation upon flame‐treatment. The formation of oxygen vacancies activates the donor doping, and as a result, the charge carrier density increases. In general, butane reduced flame‐treatment as a simple and effective strategy can be used as a post‐heat treatment to boost the PEC properties of hematite thin films.

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Thin-Film Photovoltaic Devices Based on A2B6 Compounds

Potlog

2016

Nanostructures and Thin Films for Multifunctional Applications

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The Effect of Rapid Temperature Annealing with N₂and H₂on Photoelectrochemical Properties of u-TiO₂

Cited by 7 publications

References 24 publications

Recent progress in enhancing solar-to-hydrogen efficiency

Recent progress in enhancing solar-to-hydrogen efficiency

Photoelectrochemical properties of butane reduced flame‐treated Zr‐doped hematite thin films

Thin-Film Photovoltaic Devices Based on A2B6 Compounds

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