Coverage control of CdSe quantum dots in the photodeposition on TiO2 for the photoelectrochemical solar hydrogen generation

Yoshii, Mari; Murata, Yusuke; Nakabayashi, Yasunari; Ikeda, Takuya; Fujishima, Musashi; Tada, Hiroaki

doi:10.1016/j.jcis.2016.04.018

Cited by 19 publications

(10 citation statements)

References 28 publications

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“…Quantum dot (QD) sensitization also has some unique advantages in light absorption coefficient, photocorrosion, multi‐electron excitation, and adjustment of the absorption range for the band gap can be tuned by varying QD sizes . A variety of semiconductor QDs, including CdS, CuS, PbS, CdSe, Bi 2 S 3 , and InP, have been investigated to sensitize TiO 2 as a sensitizing agent. CdTe QDs, with a band gap of 1.54 eV and as one of the most important sensitizers in solar cells, have also been studied extensively as a visible‐light‐activated agent because of its photovoltaic, photorefractive, and magneto‐optics properties.…”

Section: Introductionmentioning

confidence: 99%

Sized dependence and microstructural defects on highly photocatalytic activity based on multisized CdTe quantum dots sensitized TiO₂

Han

Song

et al. 2019

Surface & Interface Analysis

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A series of sensitized TiO 2 NPs with enhanced photocatalytic activity were prepared by different sized CdTe QDs with bifunctional ligand interlinking. The microstructures and morphologies of four different sizes of CdTe QDs and CdTe QDs sensitized TiO 2 NPs were characterized systematically by fluorescence spectroscopy, UV-Vis diffuse reflectance spectroscopy, FT-IR, XRD, XPS, FE-SEM, HRTEM, BET, and positron annihilation lifetime spectroscopy (PALS). The photocatalytic performance of CdTe QDs sensitized TiO 2 NPs was investigated by degrading MO and MB in aqueous solution under visible light irradiation. The process of degradation complied with the firstorder reaction kinetics. Four different sized CdTe QDs sensitized TiO 2 exhibitedhigher photocatalytic activities than TiO 2 . Particularly, yellow emitting CdTe QDs (3.28 nm) sensitized TiO 2 (CT_1.5) showed the best photocatalytic performance, which may be attributed to the optimal NP size, and has a moderate light absorption and electron injection. The effect of microstructural defects on CdTe QDs sensitized TiO 2 has been confirmed effectively by positron lifetime measurements.

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Section: Introductionmentioning

confidence: 99%

Sized dependence and microstructural defects on highly photocatalytic activity based on multisized CdTe quantum dots sensitized TiO₂

Han

Song

et al. 2019

Surface & Interface Analysis

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“…So far, the performance has been reported for many three‐electrode QD‐SPEC cells under application of an external bias . The evaluation of two‐electrode PEC is necessary to determine the solar‐to‐current conversion efficiency (STCE) and solar‐to‐hydrogen conversion efficiency (STHE); however, studies on two‐electrode PEC cells are limited . The prototype of two‐electrode QD‐SPEC cells has the structure of QD‐sensitized mesoporous TiO 2 photoanode (QD/mp‐TiO 2 ) | aqueous electrolyte solution | Pt cathode (Scheme ).…”

Section: Methodsmentioning

confidence: 99%

Photocatalytic Synthesis of CdS(core)–CdSe(shell) Quantum Dots with a Heteroepitaxial Junction on TiO₂: Photoelectrochemical Hydrogen Generation from Water

et al. 2017

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A major challenge in chemistry for the synthesis of hetero-nanostructures is to build up atomically commensurate interfaces for smooth interfacial charge transfer. Photodeposition of CdSe on a CdS-preloaded mesoporous TiO nanocrystalline film yields CdS(core)-CdSe(shell) quantum dots (CdS@CdSe/mp-TiO ) with a heteroepitaxial nanojunction at 298 K. Two-electrode quantum-dot-sensitized photoelectrochemical (QD-SPEC) cells with the structure photoanode |0.25 M Na S, 0.35 M Na SO (solvent=water)| cathode were fabricated. The CdS@CdSe QD-SPEC cell affords a solar-to-current efficiency (STCE) of 0.03 % without external bias under illumination of simulated sunlight (λ>430 nm, AM 1.5, one sun). By applying 0.1 V between the electrodes, the STCE increases up to 0.048 %, far surpassing the CdS/mp-TiO and CdSe/mp-TiO photoanode cells. The CdS-CdSe interfacial analysis by high-resolution transmission electron microscopy and the band energy analysis taking the size quantization and the electrolyte effect indicate that the excellent performance of the CdS@CdSe/mp-TiO photoanode originates from the effective charge separation due to the cascade-like band edge alignment and the heteroepitaxial junction between CdS and CdSe QDs. In addition, high surface coverage of TiO with QDs can contribute to the reduction in the loss of the electron transport from TiO to the electron collecting electrode.

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“…The main peaks at 284.6, 286.6, and 288.4 eV in the high-resolution C 1s spectrum of MM-500 could be assigned to C=C, C-C, and C=O bonds, respectively (Figure 3(b)), originating from residual carbon after the calcination of MIL-125 [44,58]. The two distinct peaks at 464.4 and 458.8 eV in the Ti 2p spectrum could be ascribed to Ti 2p1/2 and Ti 2p3/2 (Figure 3(c)), respectively [48,59]. Compared to pristine TiO2 (the binding energy of Ti 2p3/2 is ~459 eV) [60], the corresponding peak of Ti 2p3/2 in MM-500 shifted to a lower binding energy (458.8 eV), revealing that N might be embedded in the TiO2 structure.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 98%

Robust photocatalytic benzene degradation using mesoporous disk-like N-TiO2 derived from MIL-125(Ti)

Zhao

Wang

Chen

et al. 2020

Chinese Journal of Catalysis

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Coverage control of CdSe quantum dots in the photodeposition on TiO2 for the photoelectrochemical solar hydrogen generation

Cited by 19 publications

References 28 publications

Sized dependence and microstructural defects on highly photocatalytic activity based on multisized CdTe quantum dots sensitized TiO₂

Sized dependence and microstructural defects on highly photocatalytic activity based on multisized CdTe quantum dots sensitized TiO₂

Photocatalytic Synthesis of CdS(core)–CdSe(shell) Quantum Dots with a Heteroepitaxial Junction on TiO₂: Photoelectrochemical Hydrogen Generation from Water

Robust photocatalytic benzene degradation using mesoporous disk-like N-TiO2 derived from MIL-125(Ti)

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Coverage control of CdSe quantum dots in the photodeposition on TiO2 for the photoelectrochemical solar hydrogen generation

Cited by 19 publications

References 28 publications

Sized dependence and microstructural defects on highly photocatalytic activity based on multisized CdTe quantum dots sensitized TiO2

Sized dependence and microstructural defects on highly photocatalytic activity based on multisized CdTe quantum dots sensitized TiO2

Photocatalytic Synthesis of CdS(core)–CdSe(shell) Quantum Dots with a Heteroepitaxial Junction on TiO2: Photoelectrochemical Hydrogen Generation from Water

Robust photocatalytic benzene degradation using mesoporous disk-like N-TiO2 derived from MIL-125(Ti)

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Sized dependence and microstructural defects on highly photocatalytic activity based on multisized CdTe quantum dots sensitized TiO₂

Sized dependence and microstructural defects on highly photocatalytic activity based on multisized CdTe quantum dots sensitized TiO₂

Photocatalytic Synthesis of CdS(core)–CdSe(shell) Quantum Dots with a Heteroepitaxial Junction on TiO₂: Photoelectrochemical Hydrogen Generation from Water