Shinya Higashimoto | Osaka Institute of Technology (original) (raw)

Papers by Shinya Higashimoto

Boosting charge transport in the BiVO₄ photoanode interface modified with an aluminum hydroxide layer for solar water oxidation

Sustainable energy & fuels, 2024

Photocatalytic property of WO3 modified with noble metal co-catalysts towards selective hydroxylation of benzene to phenol under visible light irradiation

Applied Catalysis B-environmental, May 1, 2023

Synthesis, characterization and photocatalytic activity of N-doped TiO2 modified by platinum chloride

Catalysis Today, Mar 1, 2008

Abstract Structures and photocatalytic performance of N-doped TiO 2 modified by platinum chloride... more Abstract Structures and photocatalytic performance of N-doped TiO 2 modified by platinum chloride (PtCl x /N-TiO 2 ) was investigated. It was found that the PtCl x /N-TiO 2 forms anatase structure of TiO 2 involving nitrogen, chloride species and platinum ions (+IV) as major species, and it exhibits higher photocatalytic activity than either N-TiO 2 or PtCl x /TiO 2 for the decomposition of acetic acid or acetaldehyde in aqueous solutions under visible light irradiation ( λ > 420 nm). An enhancement of the photocatalytic activity on PtCl x /N-TiO 2 has been proposed as a Z-scheme mechanism for charge separation between platinum chloride and N-TiO 2 .

International Journal of Quantum Chemistry, 2001

In 2 O 3-Ga 2 O 3 /Al 2 O 3 nanocomposite catalysts combined the advantages of good propene selec... more In 2 O 3-Ga 2 O 3 /Al 2 O 3 nanocomposite catalysts combined the advantages of good propene selectivity offered by Ga 2 O 3 /Al 2 O 3 and high propene conversion provided by In 2 O 3 /Al 2 O 3 to yield catalysts with excellent de-NO x activity. A high NO conversion to N 2 of 80% was achieved over the catalyst with 2 wt% In and 8 wt% Ga. This NO conversion was attained even in the presence of 15% O 2 and 10% H 2 O. The In 2 O 3-Ga 2 O 3 /Al 2 O 3 nanocomposite remained active in the presence of SO 2. This combination of high activity, hydrothermal stability and sulfur resistance made our nanocomposite catalysts very interesting for applications in the selective catalytic reduction (SCR) of NO x .

無溶媒化学酸化重合により合成したポリ(3,4-エチレンジオキシチオフェン)粒子

トンネル構造リン酸塩,KMg_1-xH_2x(PO_3)_3 ・yH_2Oの水分子の配列と高プロトン伝導率【JST・京大機械翻訳】

RSC Advances (Web), 2020

長期間耐久性を達成するための硫化銅インジウム量子ドット増感TiO_2太陽電池のための二元イオン液体電解質【JST・京大機械翻訳】

Journal of Electroanalytical Chemistry, 2019

Synthesis, characterization and photocatalytic reactivities of Mo-MCM-41 mesoporous molecular sieves: Effect of the Mo content on the local structures of Mo-oxides

Journal of Catalysis, Oct 25, 2005

ABSTRACT

Synthesis, characterization and photocatalytic properties of robust resorcinol-formaldehyde polymer fine particles

Applied Catalysis A-general, Aug 1, 2021

Abstract For design and development of effective visible-light responsible artificial photocataly... more Abstract For design and development of effective visible-light responsible artificial photocatalytic system, resorcinol-formaldehyde (RF) resin polymer photocatalysts have been extensively studied. The RF resin polymer fine particles with different compositions were systematically prepared by hydrothermal synthesis. The RF polymers were characterized by UV–vis, XRD, SEM, FT-IR, electrochemical impedance spectroscopy, photoelectrochemical response, and DFT calculation. Attention was much paid to effects of R/F molar compositions and the preparation temperatures of the RF polymers on their photocatalytic activities for H2O2 production from O2 and H2O. Furthermore, the charge transfer complexes formed by the interaction of benzenoid OH with quinone C O were found to play a vital role in the photocatalytic reactions under visible-light irradiation.

Photocatalytic water splitting on the CuInS2 photoelectrodes: Effects of co-electrodeposition mechanisms on the photoelectrochemical properties

Catalysis Today, Feb 1, 2023

Fabrication of Pt/In2S3/CuInS2 thin film as stable photoelectrode for water splitting under solar light irradiation

Catalysis Today, Sep 1, 2021

Abstract Hydrogen has been expected as a new energy carrier for realizing low carbon society. Thi... more Abstract Hydrogen has been expected as a new energy carrier for realizing low carbon society. This paper demonstrates H2 production from water splitting for development of artificial photosynthesis on the copper indium sulfide (CuInS2) electrodes. The photoelectrode was fabricated by electrodeposition (ED) of Cu and In metallic precursors on Mo-coated glass, followed by sulfurization under sulfur (S) vapor environment instead of H2S gas. In order to improve surface properties, the CuInS2 surface was modified with In2S3 by the chemical bath deposition (CBD). The Pt particles as a co-catalyst for proton reduction were, then, photo-electrochemically deposited on the CuInS2 or In2S3/CuInS2 electrodes. They exhibited photo-electrochemical (PEC) water splitting in 0.1 M Na2SO4 aqueous solution to produce H2, of which the efficiency is in the order of: Pt-In2S3/CuInS2 > Pt-CuInS2 >> CuInS2. The half-cell solar-to-hydrogen (HC-STH) of 0.7 % with almost 100 % Faraday efficiency was obtained on the Pt-In2S3/CuInS2 photoelectrode. High photoelectrochemical property is attributed to the band-bending of p-n homo-junction between CuInS2 and In2S3.

二酸化チタンに基づく可視光感受性光触媒反応:機構的洞察と応用【JST・京大機械翻訳】

Surface-Functionalized TiO2 Photocatalyst Modified by the Interfacial Surface Complex (ISC)

Nanostructure science and technology, 2016

In this chapter, TiO2 photocatalyst modified with the interfacial surface complex (ISC), which ex... more In this chapter, TiO2 photocatalyst modified with the interfacial surface complex (ISC), which exhibits selective oxidation of several aromatic alcohols under visible-light irradiation is reviewed. It was confirmed that benzylic alcohols with several substituted groups are converted into the corresponding benzaldehydes with high selectivity (>99 %). Furthermore, the origin of the visible-light response and the reaction mechanisms for the photocatalytic oxidation of benzylic alcohols were discussed by the combination of DFT calculations. Also, effects of substituted groups in the benzylic alcohols and their orientations on the photocatalytic activities were discussed.

The Proceedings of Conference of Kansai Branch, 2012

Journal of Catalysis, Sep 10, 2009

Replacement of traditional thermal synthesis of fine chemicals by selective photocatalysis can le... more Replacement of traditional thermal synthesis of fine chemicals by selective photocatalysis can lead to more environmental friendly processes, carried out at milder conditions, using ambient temperature, atmospheric pressure, with more ecological and economic solvents such as water. Because benzaldehyde (BAL), as fine chemical building block, has an enormous range of applications in pharmaceutical, fragrance and agricultural industries, we analyzed its route of synthesis by the photocatalytic oxidation of benzyl alcohol (BA). In this work, we used graphitized-carbon nitride (g-C 3 N 4) as photocatalyst for the selective synthesis of benzaldehyde from benzyl alcohol. The solid matrix of the photocatalyst was modified by loading different metals such as Au, Ru, Pd, Pt, Ir, Ag and Rh. Conversion, yield and selectivity were compared against benchmark commercial photocatalyst P25 TiO 2 (by Evonik). The influence of the physical-chemical nature of the medium, by means of the pH, on the efficiency of the photocatalytic process was also evaluated. The 1 wt.% Ru/g-C 3 N 4 photocatalyst had the best compromise between conversion (73%) and selectivity (72%) for a 4 h of irradiation time using 390 nm activation by a light emitting diode source and it proved to be stable up to 3 consecutive runs.

Catalysis Letters, May 1, 2005

In this work, we have carried out ivestigations on photo-electrochemical energy conversion and st... more In this work, we have carried out ivestigations on photo-electrochemical energy conversion and storage on WO 3 /TiO 2 hybrid materials. The band gap excitation of the hybrid WO 3 /TiO 2 having an amorphous WO 3 phase led to an effective photo-charging to form a tungsten bronze structure by the intercalation of protons while a reversible discharging through de-intercalation could also be observed.

Superstrate-type photovoltaics with copper indium sulfide (CuInS2) fabricated by solution processes: correlation between interfacial charge transfer and solar cell performance

Journal of Applied Electrochemistry

Effect of cyclic voltammetry on the deposition of Ni cocatalyst on CuInS2 photoelectrode for water splitting under solar light irradiation

Research on Chemical Intermediates

Photocatalytic water splitting on Cu2SnS3 photoelectrode: Effects of Cu/Sn composite ratio on the photoelectrochemical performance

Catalysis Today

Fabrication of Cu2znsns4 (Czts) by Co-Electrodeposition of Cu-Zn-Sn Alloys, and Effect of Chemical Composition of Czts on Their Photoelectrochemical Water Splitting

SSRN Electronic Journal