1
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Sato H, Sugimoto T. Direct Operando Identification of Reactive Electron Species Driving Photocatalytic Hydrogen Evolution on Metal-Loaded Oxides. J Am Chem Soc 2024. [PMID: 39189394 DOI: 10.1021/jacs.3c14558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/28/2024]
Abstract
Performing operando spectroscopy under practical reaction conditions and extracting spectral components correlating with reaction activity are crucial in elucidating the reactive species in photocatalysis. However, the observation of weak signals corresponding to reactive photogenerated species is frequently hampered under reaction conditions owing to intense background signals originating from thermally induced species unrelated to the photoinduced reactions. Herein, by synchronizing the millisecond periodic excitations of photocatalysts with a Michelson interferometer used for FT-IR spectroscopy, we succeeded in significantly suppressing the signals derived from thermally excited electrons and observing the reactive photogenerated electrons contributing to the photocatalytic hydrogen evolution. This demonstration was achieved for metal-loaded oxide photocatalysts under steam methane reforming and water splitting conditions. Although it has long been conventionally believed that loaded metal cocatalysts function as sinks for reactive photogenerated electrons and active sites for reduction reactions, we found that the free electrons in the metal cocatalysts were not directly involved in the reduction reaction. Alternatively, the electrons shallowly trapped in the in-gap states of oxides contributed to enhancing the hydrogen evolution rate upon the loading of metal cocatalysts. We verified that the electron abundance in the in-gap states was clearly correlated to the reaction activity, suggesting that metal-induced semiconductor surface states formed in the periphery of the metal cocatalyst play key roles in the photocatalytic hydrogen evolution. Our microscopic insights shift a paradigm on the traditionally believed role of metal cocatalysts in photocatalysis and provide a fundamental basis for rational design of the metal/oxide interfaces as promising platforms for nonthermal hydrogen evolution.
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Affiliation(s)
- Hiromasa Sato
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
| | - Toshiki Sugimoto
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Okazaki, Aichi 444-8585, Japan
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2
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Adams J, Chen H, Ricciardulli T, Vijayaraghavan S, Sampath A, Flaherty DW. Distinct Site Motifs Activate O 2 and H 2 on Supported Au Nanoparticles in Liquid Water. ACS Catal 2024; 14:3248-3265. [PMID: 38449529 PMCID: PMC10913054 DOI: 10.1021/acscatal.3c05072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/31/2024] [Accepted: 02/05/2024] [Indexed: 03/08/2024]
Abstract
Au nanoparticles catalyze the activation and conversion of small molecules with rates and kinetic barriers that depend on the dimensions of the nanoparticle, composition of the support, and presence of catalytically culpable water molecules that solvate these interfaces. Here, molecular interpretations of steady-state rate measurements, kinetic isotope effects, and structural characterizations reveal how the interface of Au nanoparticles, liquid water, and metal oxide supports mediate the kinetically relevant activation of H2 and sequential reduction of O2-derived intermediates during the formation of H2O2 and H2O. Rates of H2 consumption are 10-100 fold greater on Au nanoparticles supported on metal oxides (e.g., titania) compared to more inert and hydrophobic materials (carbon, boron nitride). Similarly, Au nanoparticles on reducible and Lewis acidic supports (e.g., lanthana) bind dioxygen intermediates more strongly and present lower barriers (<22 kJ mol-1) for O-O bond dissociation than inert interfaces formed with silica (>70 kJ mol-1). Selectivities for H2O2 formation increase significantly as the diameters of the Au nanoparticles increase because differences in nanoparticle size change the relative fractions of exposed sites that exist at Au-support interfaces. In contrast, site-normalized rates and barriers for H2 activation depend weakly on the size of Au nanoparticles and the associated differences in active site motifs. These findings suggest that H2O aids the activation of H2 at sites present across all surface Au atoms when nanoparticles are solvated by water. However, molecular O2 preferentially binds and dissociates at Au-support interfaces, leading to greater structure sensitivity for barriers of O-O dissociation across different support identities and sizes of Au nanoparticles. These insights differ from prior knowledge from studies of gas-phase reactions of H2 and O2 upon Au nanoparticle catalysts within dilute vapor pressures of water (10-4 to 0.1 kPa H2O), in which catalysis occurs at the perimeter of the Au-support interface. In contrast, contacting Au catalysts with liquid water (55.5 M H2O) expands catalysis to all surface Au atoms and enables appreciable H2O2 formation.
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Affiliation(s)
- Jason
S. Adams
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Haoyu Chen
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Tomas Ricciardulli
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Sucharita Vijayaraghavan
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Abinaya Sampath
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - David W. Flaherty
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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3
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Singh R, Yadav V, Siddhanta S. Probing plasmon-induced surface reactions using two-dimensional correlation vibrational spectroscopy. Phys Chem Chem Phys 2023; 25:6032-6043. [PMID: 36779479 DOI: 10.1039/d2cp05705k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Surface plasmon resonance (SPR) has the ability to drive catalytic conversion of the reactant molecules via the production of hot electrons, which in general requires high activation energy. The reactions driven by these hot electrons are critical and essential in various heterogeneous surface catalytic reactions. However, there is a need to understand the dynamics of surface reactions and the underlying mechanism, which are influenced by several factors such as the constitution of the nanoparticle, exposure time, and reaction conditions to name a few. However, the effect of solvent in stabilizing the electron-hole pair, the orientation, and the surface coverage of the analyte are poorly understood due to the limitations of current methods. To get deeper insights into the reaction dynamics, we have demonstrated the combined utility of plasmon-enhanced Raman spectroscopy and Two-dimensional correlation spectroscopy (2DCOS) to study the plasmon-driven conversion of 4-nitrothiophenol on the surface of plasmonic nanoparticles. Interestingly, this combined technique provided us with previously unobservable results regarding surface catalysis by conventional spectroscopic analysis alone. Specifically, for the first time, 2DCOS provided critical insights in bridging the gap in our understanding of the interplay of solvent effect, orientation, and surface packing of the analyte molecules. It was observed that certain species like 4,4-dimercaptoazobenzene (DMAB) or 4-aminothiophenol (4-ATP) can be selectively formed based on the ordered or disordered phases of the analytes on the surface, thus paving the way to precisely control light-driven reactions through operando spectroscopy.
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Affiliation(s)
- Ruchi Singh
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Vikas Yadav
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Soumik Siddhanta
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
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4
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Uner D, Yilmaz B. Elucidating the role of adsorption during artificial photosynthesis: H 2O and CO 2 adsorption isotherms over TiO 2 reveal thermal effects under UV illumination. PHOTOSYNTHESIS RESEARCH 2022; 154:353-367. [PMID: 35687276 DOI: 10.1007/s11120-022-00924-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
Adsorption measurements of CO2 and H2O over TiO2 surfaces in dark and under illumination were carried out to reveal the ensuing bottlenecks of the initial steps of the artificial photosynthesis reaction. When the adsorption isotherms of both CO2 and H2O were measured under illumination, the results were comparable to isotherms measured at higher temperatures in dark. This evidence is interpreted as the presence of hot spots, due to charge carrier recombination reactions. Differential heat of adsorption measurements revealed that H2O adsorption on TiO2 is stronger, and with a higher coverage than that of CO2. Dissociation of water is an energetically uphill reaction, and the local hot spots due to charge carrier recombination in indirect bandgap semiconductors can enhance the reaction probability. At higher temperatures, higher reaction probabilities are expected and estimated by a thermodynamic analysis for water splitting reaction. The potential role of these hot spots during natural and artificial photosynthetic reactions is discussed.
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Affiliation(s)
- Deniz Uner
- Department of Chemical Engineering, Faculty of Engineering, Middle East Technical University, Ankara, Turkey.
| | - Begum Yilmaz
- Department of Chemical Engineering, Faculty of Engineering, Middle East Technical University, Ankara, Turkey
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5
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Ghani AA, Maile N, Tahir K, Kim B, Lim Y, Jang J, Lee DS. Electrocatalytic oxidation of antidiabetic drug metformin adsorbed on intercalated MXene. CHEMOSPHERE 2022; 307:135767. [PMID: 35868528 DOI: 10.1016/j.chemosphere.2022.135767] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
Two-dimensional (2D) Ti3C2Tx transition metal carbide (MXene) nanosheets intercalated with sodium ions (SI-Ti3C2Tx MXene) were used in the adsorption and electrochemical regeneration process for removal of the antidiabetic drug metformin (MF) as a model emerging pollutant. After MF adsorption, SI-Ti3C2Tx MXene oxidized the MF on its surface through its electrocatalytic activity at very low current density and cell potential. For complete oxidation the optimum parameters were 0.525 C g-1, 0.005 mA cm-2, and pH 6 in absence of NaCl or 26.25 C g-1 and 0.5 mA cm-2 in the presence of 2.5 w/v% NaCl. The overall regeneration of SI-Ti3C2Tx is governed by a combined mechanism, i.e., desorption followed by degradation. The degradation mechanism, such as direct electron transfer or indirect oxidation, depends on the applied operating conditions. Thus, the investigation suggests that these 2D sheets are good nanoadsorbents as well as good electrocatalysts and proves their usefulness in practical water-treatment applications.
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Affiliation(s)
- Ahsan Abdul Ghani
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea; Department of Chemical Engineering, University of Karachi, Main University Road, Karachi, 75270, Sindh, Pakistan
| | - Nagesh Maile
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea
| | - Khurram Tahir
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea
| | - Bolam Kim
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea
| | - Youngsu Lim
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea
| | - Jiseon Jang
- R&D Institute of Radioactive Wastes, Korea Radioactive Waste Agency, 174 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea.
| | - Dae Sung Lee
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea.
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6
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Cazzaniga M, Micciarelli M, Gabas F, Finocchi F, Ceotto M. Quantum Anharmonic Calculations of Vibrational Spectra for Water Adsorbed on Titania Anatase(101) Surface: Dissociative versus Molecular Adsorption. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:12060-12073. [PMID: 35928238 PMCID: PMC9340806 DOI: 10.1021/acs.jpcc.2c02137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 06/10/2022] [Indexed: 06/15/2023]
Abstract
The interaction of water molecules and hydroxyl groups with titanium dioxide (TiO2) surfaces is ubiquitous and very important in anatase nanoparticle photocatalytic processes. Infrared spectroscopy, assisted by ab initio calculations of vibrational frequencies, can be a powerful tool to elucidate the mechanisms behind water adsorption. However, a straightforward comparison between measurements and calculations remains a challenging task because of the complexity of the physical phenomena occurring on nanoparticle surfaces. Consequently, severe computational approximations, such as harmonic vibrational ones, are usually employed. In the present work we partially address this complexity issue by overcoming some of the standard approximations used in theoretical simulations and employ the Divide and Conquer Semiclassical Initial Value Representation (DC-SCIVR) molecular dynamics. This method allows to perform simulations of vibrational spectra of large dimensional systems accounting not only for anharmonicities, but also for nuclear quantum effects. We apply this computational method to water and deuterated water adsorbed on the ideal TiO2 anatase(101) surface, contemplating both the molecular and the dissociated adsorption processes. The results highlight not only the presence of an anharmonic shift of the frequencies in agreement with the experiments, but also complex quantum mechanical spectral signatures induced by the coupling of molecular vibrational modes with the surface ones, which are different in the hydrogenated case from the deuterated one. These couplings are further analyzed by exploiting the mode subdivision performed during the divide and conquer procedure.
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Affiliation(s)
- Marco Cazzaniga
- Dipartimento
di Chimica, Universitá degli Studi
di Milano, via Golgi 19, 20133 Milano, Italy
| | - Marco Micciarelli
- Dipartimento
di Chimica, Universitá degli Studi
di Milano, via Golgi 19, 20133 Milano, Italy
| | - Fabio Gabas
- Dipartimento
di Chimica, Universitá degli Studi
di Milano, via Golgi 19, 20133 Milano, Italy
| | - Fabio Finocchi
- Sorbonne
Université, CNRS, Institut des NanoSciences
de Paris (INSP), 4 Place
Jussieu, Paris F- 75005, France
| | - Michele Ceotto
- Dipartimento
di Chimica, Universitá degli Studi
di Milano, via Golgi 19, 20133 Milano, Italy
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7
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Acetone to isobutene conversion on ZnxTiyOz: Effects of TiO2 facet. J Catal 2022. [DOI: 10.1016/j.jcat.2022.03.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Almazroai L, El-Mekawy RE, Musa R, Ali L. Photocatalytic hydrogen evolution over cyanine-sensitized Ag/TiO 2. RSC Adv 2022; 12:15992-16002. [PMID: 35865718 PMCID: PMC9261485 DOI: 10.1039/d2ra00788f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 05/13/2022] [Indexed: 11/21/2022] Open
Abstract
Sensitization of TiO2 by dyes such as cyanine and their derivatives is used as a technique to improve potency for the production of hydrogen gas as an alternative green fuel. These dyes shift the spectrum of TiO2 from the UV region to the visible region, enabling it to harvest as much sunlight as possible. Herein, four different derivatives of cyanine (labelled C1, C2, C3, and C4) were prepared and doped in Ag/TiO2 via the impregnation method. The properties of the prepared photocatalysts were studied by XRD, SEM-EDS, FTIR, and UV-visible spectroscopy. The sensitized photocatalysts exhibited a similar morphology, nanoscale particle size, and good absorbance in the visible region. The rate constant for the photocatalytic activity of Ag/TiO2 showed a great enhancement for hydrogen evolution after sensitization from 0.088 to 0.33 μmol min-1. Doping of the C2 derivative in Ag/TiO2 promoted the photocatalytic and sonophotocatalytic rates of H2 production by 7.5 and 9 times, respectively. Also, the amount of photocatalyst had a significant effect on the photocatalytic activity of the sensitized Ag/TiO2, where 0.14 g was the optimum dose, giving the maximum yield at both the initial rate and 300 min. One of the important factors causing the efficiency to reach high levels is the inhibition of photogenerated electron/hole recombination. This was achieved by adding a small quantity of methanol, which increased the rate by 9 times. The stability of the prepared photocatalysts was tested, which gave good results even after their 5th use. All the results confirmed that the sensitization of metal oxides is a promising solution in industry to produce clean energy (H2) in high quantities over highly stable photocatalysts.
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Affiliation(s)
- Layla Almazroai
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University Makkah Saudi Arabia
| | - Rasha E El-Mekawy
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University Makkah Saudi Arabia
- Department of Petrochemicals, Egyptian Petroleum Research Institute Nasr City Cairo Egypt
| | | | - Lina Ali
- Undergraduate students Saudi Arabia
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9
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Drdova S, Giannakou M, Jiang F, Lin L, Sivaraman D, Toth R, Graule T, Braun A, Ilavsky J, Kuzmenko I, Wang J. Aerosol-Assisted Deposition for TiO2 Immobilization on Photocatalytic Fibrous Filters for VOC Degradation. Front Chem 2022; 10:887431. [PMID: 35646823 PMCID: PMC9130724 DOI: 10.3389/fchem.2022.887431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/12/2022] [Indexed: 11/13/2022] Open
Abstract
Atomization and spraying are well-established methods for the production of submicrometer- and micrometer- sized powders. In addition, they could be of interest to the immobilization of photocatalytic nanoparticles onto supports because they enable the formation of microporous films with photocatalytic activity. Here, we provide a comparison of aerosol-assisted immobilization methods, such as spray-drying (SD), spray atomization (SA), and spray gun (SG), which were used for the deposition of TiO2 dispersions onto fibrous filter media. The morphology, microstructure, and electronic properties of the structures with deposited TiO2 were characterized by SEM and TEM, BET and USAXS, and UV-Vis spectrometry, respectively. The photocatalytic performances of the functionalized filters were evaluated and compared to the benchmark dip-coating method. Our results showed that the SG and SA immobilization methods led to the best photocatalytic and operational performance for the degradation of toluene, whereas the SD method showed the lowest degradation efficiency and poor stability of coating. We demonstrated that TiO2 sprays using the SG and SA methods with direct deposition onto filter media involving dispersed colloidal droplets revealed to be promising alternatives to the dip-coating method owing to the ability to uniformly cover the filter fibers. In addition, the SA method allowed for fast and simple control of the coating thickness as the dispersed particles were continuously directed onto the filter media without the need for repetitive coatings, which is common for the SG and dip-coating methods. Our study highlighted the importance of the proper immobilization method for the efficient photocatalytic degradation of VOCs.
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Affiliation(s)
- Sarka Drdova
- Institute of Environmental Engineering, ETHZ, Zürich, Switzerland
- Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Marianna Giannakou
- Institute of Environmental Engineering, ETHZ, Zürich, Switzerland
- Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Fuze Jiang
- Institute of Environmental Engineering, ETHZ, Zürich, Switzerland
- Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Luchan Lin
- Laboratory for Joining Technologies and Corrosion, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Deeptanshu Sivaraman
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Rita Toth
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Thomas Graule
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Artur Braun
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Jan Ilavsky
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, United States
| | - Ivan Kuzmenko
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, United States
| | - Jing Wang
- Institute of Environmental Engineering, ETHZ, Zürich, Switzerland
- Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
- *Correspondence: Jing Wang,
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10
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Investigation of mechanisms of radiolytic H2 production in C-S-H: Influence of water content and radiation induced defects. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Kura N, Neelakantla A, Sudarshan K, Gandhi A, Atcha KR, Reddy PM, Mone R, Upender G, B. VK. One – Pot Hydrothermal Preparation and Defects Enhanced Photocatalytic Activity of Bi doped CdWO4 Nanospheres. Phys Chem Chem Phys 2022; 24:8775-8786. [DOI: 10.1039/d1cp02885e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the field of photocatalysis, the suppression of electron-hole recombination through various defects has been an emerging trend to enhance the photocatalytic activity. The separation efficiency of electron-hole recombination of...
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12
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Zaman W, Matsumoto RA, Thompson MW, Liu YH, Bootwala Y, Dixit MB, Nemsak S, Crumlin E, Hatzell MC, Cummings PT, Hatzell KB. In situ investigation of water on MXene interfaces. Proc Natl Acad Sci U S A 2021; 118:e2108325118. [PMID: 34845014 PMCID: PMC8670518 DOI: 10.1073/pnas.2108325118] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/29/2021] [Indexed: 11/18/2022] Open
Abstract
A continuum of water populations can exist in nanoscale layered materials, which impacts transport phenomena relevant for separation, adsorption, and charge storage processes. Quantification and direct interrogation of water structure and organization are important in order to design materials with molecular-level control for emerging energy and water applications. Through combining molecular simulations with ambient-pressure X-ray photoelectron spectroscopy, X-ray diffraction, and diffuse reflectance infrared Fourier transform spectroscopy, we directly probe hydration mechanisms at confined and nonconfined regions in nanolayered transition-metal carbide materials. Hydrophobic (K+) cations decrease water mobility within the confined interlayer and accelerate water removal at nonconfined surfaces. Hydrophilic cations (Li+) increase water mobility within the confined interlayer and decrease water-removal rates at nonconfined surfaces. Solutes, rather than the surface terminating groups, are shown to be more impactful on the kinetics of water adsorption and desorption. Calculations from grand canonical molecular dynamics demonstrate that hydrophilic cations (Li+) actively aid in water adsorption at MXene interfaces. In contrast, hydrophobic cations (K+) weakly interact with water, leading to higher degrees of water ordering (orientation) and faster removal at elevated temperatures.
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Affiliation(s)
- Wahid Zaman
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235
| | - Ray A Matsumoto
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN 37235
| | - Matthew W Thompson
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN 37235
| | - Yu-Hsuan Liu
- Department of Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332
| | - Yousuf Bootwala
- Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
| | - Marm B Dixit
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235
| | - Slavomir Nemsak
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Ethan Crumlin
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Marta C Hatzell
- Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
| | - Peter T Cummings
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN 37235;
| | - Kelsey B Hatzell
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544;
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235
- Andlinger Center for Energy and Environment, Princeton University, Princeton, NJ 08540
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13
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Review on MXenes-based nanomaterials for sustainable opportunities in energy storage, sensing and electrocatalytic reactions. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117524] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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14
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Dagdeviren OE, Glass D, Sapienza R, Cortés E, Maier SA, Parkin IP, Grütter P, Quesada-Cabrera R. The Effect of Photoinduced Surface Oxygen Vacancies on the Charge Carrier Dynamics in TiO 2 Films. NANO LETTERS 2021; 21:8348-8354. [PMID: 34582208 DOI: 10.1021/acs.nanolett.1c02853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Metal-oxide semiconductors (MOS) are widely utilized for catalytic and photocatalytic applications in which the dynamics of charged carriers (e.g., electrons, holes) play important roles. Under operation conditions, photoinduced surface oxygen vacancies (PI-SOV) can greatly impact the dynamics of charge carriers. However, current knowledge regarding the effect of PI-SOV on the dynamics of hole migration in MOS films, such as titanium dioxide, is solely based upon volume-averaged measurements and/or vacuum conditions. This limits the basic understanding of hole-vacancy interactions, as they are not capable of revealing time-resolved variations during operation. Here, we measured the effect of PI-SOV on the dynamics of hole migration using time-resolved atomic force microscopy. Our findings demonstrate that the time constant associated with hole migration is strongly affected by PI-SOV, in a reversible manner. These results will nucleate an insightful understanding of the physics of hole dynamics and thus enable emerging technologies, facilitated by engineering hole-vacancy interactions.
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Affiliation(s)
- Omur E Dagdeviren
- Department of Mechanical Engineering, École de technologie supérieure, University of Quebec, Montreal H3C 1K3, Quebec, Canada
| | - Daniel Glass
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, U.K
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Riccardo Sapienza
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, U.K
| | - Emiliano Cortés
- Chair in Hybrid Nanosystems, Faculty of Physics, Ludwig Maximilians Universität München, München 80539, Germany
| | - Stefan A Maier
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, U.K
- Chair in Hybrid Nanosystems, Faculty of Physics, Ludwig Maximilians Universität München, München 80539, Germany
| | - Ivan P Parkin
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Peter Grütter
- Department of Physics, McGill University, Montreal H3A 2T8, Quebec, Canada
| | - Raul Quesada-Cabrera
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
- Fotoelectrocatálisis para Aplicaciones Medioambientales, Departamento de Química, Universidad de Las Palmas de Gran Canaria, Edificio Polivalente I, Campus de Tafira, Las Palmas de Gran Canaria 35017, Spain
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15
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Development of g-C3N4-TiO2 visible active hybrid photocatalyst for the photodegradation of methyl orange. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-021-04561-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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16
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A Review of Recent Developments in Molecular Dynamics Simulations of the Photoelectrochemical Water Splitting Process. Catalysts 2021. [DOI: 10.3390/catal11070807] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
In this review, we provide a short overview of the Molecular Dynamics (MD) method and how it can be used to model the water splitting process in photoelectrochemical hydrogen production. We cover classical non-reactive and reactive MD techniques as well as multiscale extensions combining classical MD with quantum chemical and continuum methods. Selected examples of MD investigations of various aqueous semiconductor interfaces with a special focus on TiO2 are discussed. Finally, we identify gaps in the current state-of-the-art where further developments will be needed for better utilization of MD techniques in the field of water splitting.
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17
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Borah R, Ninakanti R, Nuyts G, Peeters H, Pedrazo-Tardajos A, Nuti S, Vande Velde C, De Wael K, Lenaerts S, Bals S, Verbruggen SW. Selectivity in the Ligand Functionalization of Photocatalytic Metal Oxide Nanoparticles for Phase Transfer and Self-Assembly Applications. Chemistry 2021; 27:9011-9021. [PMID: 33880788 DOI: 10.1002/chem.202100029] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Indexed: 01/04/2023]
Abstract
The functionalization of photocatalytic metal oxide nanoparticles of TiO2 , ZnO, WO3 and CuO with amine-terminated (oleylamine) and thiol-terminated (dodecane-1-thiol) alkyl-chain ligands was studied under ambient conditions. A high selectivity was observed in the binding specificity of a ligand towards nanoparticles of these different oxides. It was observed that oleylamine binds stably to only TiO2 and WO3 , whereas dodecane-1-thiol binds stably only to ZnO and CuO. Similarly, polar-to-nonpolar solvent phase transfer of TiO2 and WO3 nanoparticles could be achieved by using oleylamine, but not dodecane-1-thiol, whereas the opposite holds for ZnO and CuO. The surface chemistry of ligand-functionalized nanoparticles was probed by attenuated total reflectance (ATR)-FTIR spectroscopy, which enabled the occupation of the ligands at the active sites to be elucidated. The photostability of the ligands on the nanoparticle surface was determined by the photocatalytic self-cleaning properties of the material. Although TiO2 and WO3 degrade the ligands within 24 h under both UV and visible light, ligands on ZnO and CuO remain unaffected. The gathered insights are also highly relevant from an application point of view. As an example, because the ligand-functionalized nanoparticles are hydrophobic in nature, they can be self-assembled at the air-water interface to give nanoparticle films with demonstrated photocatalytic as well as anti-fogging properties.
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Affiliation(s)
- Rituraj Borah
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Rajeshreddy Ninakanti
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,Electron Microscopy for Material Science (EMAT), Department of Physics, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Gert Nuyts
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,Antwerp X-ray Analysis, Electrochemistry and Speciation (AXES), Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Hannelore Peeters
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Adrián Pedrazo-Tardajos
- Electron Microscopy for Material Science (EMAT), Department of Physics, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Silvia Nuti
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,Electron Microscopy for Material Science (EMAT), Department of Physics, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Christophe Vande Velde
- Intelligence in Processes, Advanced Catalysts and Solvents (iPRACS), University of Antwerp, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Karolien De Wael
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,Antwerp X-ray Analysis, Electrochemistry and Speciation (AXES), Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Silvia Lenaerts
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Sara Bals
- Electron Microscopy for Material Science (EMAT), Department of Physics, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Sammy W Verbruggen
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.,NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
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18
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Kiani D, Baltrusaitis J. Immobilization and activation of cobalt-amine catalyst on NH4OH-treated activated carbon for ethylene dimerization. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.04.062] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Escamilla JC, Hidalgo-Carrillo J, Martín-Gómez J, Estévez-Toledano RC, Montes V, Cosano D, Urbano FJ, Marinas A. Hydrogen Production through Glycerol Photoreforming on TiO 2/Mesoporous Carbon: Influence of the Synthetic Method. MATERIALS 2020; 13:ma13173800. [PMID: 32872129 PMCID: PMC7504067 DOI: 10.3390/ma13173800] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 08/21/2020] [Accepted: 08/26/2020] [Indexed: 11/29/2022]
Abstract
This article explores the effect of the synthetic method of titanium dioxide (TiO2)/C composites (physical mixture and the water-assisted/unassisted sol-gel method) on their photocatalytic activity for hydrogen production through glycerol photoreforming. The article demonstrates that, apart from a high surface area of carbon and the previous activation of its surface to favor titania incorporation, the appropriate control of titania formation is crucial. In this sense, even though the amount of incorporated titania was limited by the saturation of carbon surface groups (in our case, ca. 10 wt.% TiO2), the sol-gel process without water addition seemed to be the best method, ensuring the formation of small homogeneously-distributed anatase crystals on mesoporous carbon. In this way, a ca. 110-fold increase in catalyst activity compared to Evonik P25 (expressed as hydrogen micromole per grams of titania) was achieved.
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Affiliation(s)
- Juan Carlos Escamilla
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, E-14071 Córdoba, Spain; (J.C.E.); (J.M.-G.); (R.C.E.-T.); (D.C.); (F.J.U.)
| | - Jesús Hidalgo-Carrillo
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, E-14071 Córdoba, Spain; (J.C.E.); (J.M.-G.); (R.C.E.-T.); (D.C.); (F.J.U.)
- Correspondence: (J.H.-C.); (A.M.); Tel.: +34-957-218-622 (A.M.)
| | - Juan Martín-Gómez
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, E-14071 Córdoba, Spain; (J.C.E.); (J.M.-G.); (R.C.E.-T.); (D.C.); (F.J.U.)
| | - Rafael C. Estévez-Toledano
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, E-14071 Córdoba, Spain; (J.C.E.); (J.M.-G.); (R.C.E.-T.); (D.C.); (F.J.U.)
| | - Vicente Montes
- Department of Chemical Engineering and Physical Chemistry, Faculty of Science University Institute of Water, Climate Change and Sustainability (IACYS), University of Extremadura, 06006 Badajoz, Spain;
| | - Daniel Cosano
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, E-14071 Córdoba, Spain; (J.C.E.); (J.M.-G.); (R.C.E.-T.); (D.C.); (F.J.U.)
| | - Francisco J. Urbano
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, E-14071 Córdoba, Spain; (J.C.E.); (J.M.-G.); (R.C.E.-T.); (D.C.); (F.J.U.)
| | - Alberto Marinas
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, E-14071 Córdoba, Spain; (J.C.E.); (J.M.-G.); (R.C.E.-T.); (D.C.); (F.J.U.)
- Correspondence: (J.H.-C.); (A.M.); Tel.: +34-957-218-622 (A.M.)
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20
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Ishikawa S, Noda N, Wada M, Tsurumi S, Ueda W. Selective Oxidation of Methacrolein over Crystalline Mo 3VO x Catalysts and Comparison of Their Catalytic Properties with Heteropoly Acid Catalysts. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02530] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Satoshi Ishikawa
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27, Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Nagisa Noda
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27, Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Masaki Wada
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27, Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Shota Tsurumi
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27, Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Wataru Ueda
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27, Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
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21
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Gorbachev MY, Gorinchoy NN, Osipov I. Accelerated decomposition of the fungicide, iprodione, on TiO 2 surface under solar irradiation: experimental study and DFT mechanisms. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2020; 55:876-888. [PMID: 32654594 DOI: 10.1080/03601234.2020.1790965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In the present work we have studied photo-induced decomposition of iprodione on silica support with different additions of titanium dioxide. Both the experimental and theoretical (DFT) approaches have been applied. It was found that 16 hours visible light exposure of the samples with 0.1% and 1.0% of TiO2 leads respectively to 48.28% and 21.05% of residual amounts of iprodione in these samples. A number of intermediates and end products were identified by means of GS-MS and LC-MS chromatography. The iprodione isomer (RP 30228) and its decay product 1-(3,5-dichlorophenyl)-5-isopropyl biuret (RP 36221) were identified among them. Our DFT calculations have revealed the detailed mechanisms of formation of the above products and the mechanism of accelerated proton-induced decomposition of iprodione molecules adsorbed on the TiO2 surface. Also, the intra-molecular reasons for iprodione stability in acidic media were clarified together with the mechanism of hydantoin cycle opening under the action of hydroxyl anions.
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Affiliation(s)
- Mikhail Yu Gorbachev
- Department of Quantum Chemistry, Institute of Chemistry, Academy of Sciences of Moldova, Kishinev, Republic of Moldova
| | - Natalia N Gorinchoy
- Department of Quantum Chemistry, Institute of Chemistry, Academy of Sciences of Moldova, Kishinev, Republic of Moldova
| | - Ivan Osipov
- Department of Quantum Chemistry, Institute of Chemistry, Academy of Sciences of Moldova, Kishinev, Republic of Moldova
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22
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Parrino F, Livraghi S, Giamello E, Ceccato R, Palmisano L. Role of Hydroxyl, Superoxide, and Nitrate Radicals on the Fate of Bromide Ions in Photocatalytic TiO2 Suspensions. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02010] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- F. Parrino
- Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - S. Livraghi
- Department of Chemistry and NIS, University of Torino, Via P. Giuria 7, 10125 Torino, Italy
| | - E. Giamello
- Department of Chemistry and NIS, University of Torino, Via P. Giuria 7, 10125 Torino, Italy
| | - R. Ceccato
- Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - L. Palmisano
- Department of Engineering, University of Palermo, Viale delle Scienze Ed. 6, 90128 Palermo, Italy
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23
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Yang Z, Zhong W, Chen Y, Wang C, Mo S, Zhang J, Shu R, Song Q. Improving Glycerol Photoreforming Hydrogen Production Over Ag 2O-TiO 2 Catalysts by Enhanced Colloidal Dispersion Stability. Front Chem 2020; 8:342. [PMID: 32509721 PMCID: PMC7248401 DOI: 10.3389/fchem.2020.00342] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Accepted: 04/01/2020] [Indexed: 11/19/2022] Open
Abstract
Solar-driven photocatalytic reforming of biomass-derived resources for hydrogen production offers a sustainable route toward the generation of clean and renewable fuels. However, the dispersion stability of the catalyst particles in the aqueous phase hinders the efficiency of hydrogen production. In this work, a novel method of mixing Ag2O-TiO2 photocatalysts with different morphologies was implemented to promote colloidal dispersion stability, thereby improving hydrogen production performance. A series of Ag2O-TiO2 nanoparticles with different morphologies were synthesized, and their dispersion stabilities in aqueous phase were investigated individually. Two types of Ag2O-TiO2 particles with different morphologies under certain proportions were mixed and suspended in glycerol aqueous solution without adding any dispersant for enhancing dispersion stability while reacting. From the results, photocatalytic hydrogen production was found to be strongly correlated to colloidal dispersion stability. The mixed suspension of Ag2O-TiO2 nanosphere and nanoplate achieved an excellent colloidal dispersion stability without employing any additives or external energy input, and the photoreforming hydrogen production obtained from this binary component system was around 1.1-2.3 times higher than that of the single-component system. From the calculated hydrogen production rate constants between continuous stirring and the binary system, there was only <6% difference, suggesting an efficient mass transfer of the binary system for photoreforming hydrogen production. The proposed method could provide some inspiration to a more energy-efficient heterogeneous catalytic hydrogen production process.
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Affiliation(s)
- Zhi Yang
- Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou, China
| | - Weilin Zhong
- Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou, China
| | - Ying Chen
- Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou, China
| | - Chao Wang
- Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou, China
| | - Songping Mo
- Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou, China
| | - Jingtao Zhang
- Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou, China
| | - Riyang Shu
- Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou, China
| | - Qingbin Song
- Macau Environmental Research Institute, Macau University of Science and Technology, Macao, China
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24
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Chen Q, Wang H, Luan Q, Duan R, Cao X, Fang Y, Ma D, Guan R, Hu X. Synergetic effects of defects and acid sites of 2D-ZnO photocatalysts on the photocatalytic performance. JOURNAL OF HAZARDOUS MATERIALS 2020; 385:121527. [PMID: 31708287 DOI: 10.1016/j.jhazmat.2019.121527] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 10/21/2019] [Accepted: 10/22/2019] [Indexed: 06/10/2023]
Abstract
Regulation of defects and surface acidic sites of photocatalysts is an efficient approach to improve the photocatalytic activity. Ultrathin 2D-ZnO photocatalysts were prepared to uncover the synergetic effects of defects and surface acidic sites on the photocatalytic activity. The reaction constant for photocatalytic degradation of MB upon ZnO-S is 2.26, 2.82, 12.2 times higher than that of SH-500, SO-500, and ZnO-R, respectively. The results revealed that the surface defects, hydroxyl group and chemisorbed water played pivotal roles in the generation of reactive oxygen species (ROS). Although the limited improvement of visible absorption was achieved after introduction of oxygen vacancy (VO), the overall photocatalytic activity decreased due to the reduced ROS production capacity shown by density functional theory (DFT) calculations. Hydroxyl radical is the key ROS in degradation of organics, and electron contributes a little bigger than hole in the generation of hydroxyl radical. Importantly, the decrease in surface acidic sites resulted in the decreased photocatalytic activity, proven by the dynamics of photoinduced carriers. This study reveals that the improved photocatalytic activity of 2D-ZnO photocatalysts can be attributed to the synergetic effects of surface defects and acidic sites rather than the enhanced visible absorption resulted from the VO introduction.
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Affiliation(s)
- Qifeng Chen
- School of Materials Science & Engineering, University of Jinan, Nanxinzhuang West Road 336, Jinan, Shandong, 250022, China.
| | - Hui Wang
- School of Materials Science & Engineering, University of Jinan, Nanxinzhuang West Road 336, Jinan, Shandong, 250022, China
| | - Qingrui Luan
- School of Materials Science & Engineering, University of Jinan, Nanxinzhuang West Road 336, Jinan, Shandong, 250022, China
| | - Ran Duan
- Ran Duan, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing, 100190, China
| | - Xingzhong Cao
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Yanfen Fang
- College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, 443002, China.
| | - Delong Ma
- School of Materials Science & Engineering, University of Jinan, Nanxinzhuang West Road 336, Jinan, Shandong, 250022, China
| | - Ruifang Guan
- School of Materials Science & Engineering, University of Jinan, Nanxinzhuang West Road 336, Jinan, Shandong, 250022, China
| | - Xun Hu
- School of Materials Science & Engineering, University of Jinan, Nanxinzhuang West Road 336, Jinan, Shandong, 250022, China.
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25
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Haselmann GM, Baumgartner B, Wang J, Wieland K, Gupta T, Herzig C, Limbeck A, Lendl B, Eder D. In Situ Pt Photodeposition and Methanol Photooxidation on Pt/TiO2: Pt-Loading-Dependent Photocatalytic Reaction Pathways Studied by Liquid-Phase Infrared Spectroscopy. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05588] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Greta M. Haselmann
- Technische Universität Wien, Institute of Materials Chemistry, Getreidemarkt 9, 1060 Vienna, Austria
| | - Bettina Baumgartner
- Technische Universität Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9, 1060 Vienna, Austria
| | - Jia Wang
- Technische Universität Wien, Institute of Materials Chemistry, Getreidemarkt 9, 1060 Vienna, Austria
| | - Karin Wieland
- Technische Universität Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9, 1060 Vienna, Austria
| | - Tushar Gupta
- Technische Universität Wien, Institute of Materials Chemistry, Getreidemarkt 9, 1060 Vienna, Austria
| | - Christopher Herzig
- Technische Universität Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9, 1060 Vienna, Austria
| | - Andreas Limbeck
- Technische Universität Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9, 1060 Vienna, Austria
| | - Bernhard Lendl
- Technische Universität Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9, 1060 Vienna, Austria
| | - Dominik Eder
- Technische Universität Wien, Institute of Materials Chemistry, Getreidemarkt 9, 1060 Vienna, Austria
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26
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Yurdakal S, Çetinkaya S, Augugliaro V, Palmisano G, Soria J, Sanz J, Torralvo MJ, Livraghi S, Giamello E, Garlisi C. Alkaline treatment as a means to boost the activity of TiO2 in selective photocatalytic processes. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00755b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
In this work, the activity enhancement of TiO2 photocatalysts by alkaline treatment has been investigated.
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Affiliation(s)
- Sedat Yurdakal
- Kimya Bölümü
- Fen-Edebiyat Fakültesi
- Afyon Kocatepe Üniversitesi
- 03200 Afyonkarahisar
- Turkey
| | - Sıdıka Çetinkaya
- Kimya Bölümü
- Fen-Edebiyat Fakültesi
- Afyon Kocatepe Üniversitesi
- 03200 Afyonkarahisar
- Turkey
| | - Vincenzo Augugliaro
- “Schiavello-Grillone” Photocatalysis Group
- Dipartimento di Energia
- Ingegneria dell'Informazione e Modelli Matematici (DEIM)
- Università degli Studi di Palermo
- 90128 Palermo
| | - Giovanni Palmisano
- Department of Chemical Engineering
- Khalifa University of Science and Technology
- Abu Dhabi
- United Arab Emirates
- Research and Innovation on CO2 and H2 (RICH) Center
| | - Javier Soria
- Instituto de Ciencia de Materiales
- CSIC
- 28049 Madrid
- Spain
| | - Jesus Sanz
- Instituto de Catálisis y Petroleoquímica
- CSIC
- 28049 Madrid
- Spain
| | - Maria Jose Torralvo
- Facultad de Ciencias Químicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Stefano Livraghi
- Dipartimento di Chimica and NIS
- University of Torino
- 10125 Torino
- Italy
| | - Elio Giamello
- Dipartimento di Chimica and NIS
- University of Torino
- 10125 Torino
- Italy
| | - Corrado Garlisi
- Department of Chemical Engineering
- Khalifa University of Science and Technology
- Abu Dhabi
- United Arab Emirates
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27
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Murillo-Acevedo Y, Bernal-Sanchez J, Giraldo L, Sierra-Ramirez R, Moreno-Piraján JC. Initial Approximation to the Design and Construction of a Photocatalysis Reactor for Phenol Degradation with TiO 2 Nanoparticles. ACS OMEGA 2019; 4:19605-19613. [PMID: 31788590 PMCID: PMC6881846 DOI: 10.1021/acsomega.9b01750] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 10/28/2019] [Indexed: 05/07/2023]
Abstract
A photoreactor was designed, built, and optimized to carry out the degradation of phenol. To achieve this, phenol concentration was used as the reference to compare the photocatalysis reaction efficiency obtained through this research with results from other studies. Additionally, during the building process, different types of glass were evaluated with the objective of finding a functional and economic material to build the photoreactor. It was found that Pyrex glass was the most suitable material to work with. As a UV light source to build the photoreactor, a dry gel nail lamp was used with 9 W, λ = 365 nm bulbs. On the other hand, the effects of different parameters (such as the catalyst mass (TiO2 Degussa P-25), stirring speed (RPM), UV lamps, and temperature) over the photocatalysis reaction rate were analyzed. Also, the reaction's thermodynamic parameters were determined and found to be similar to those found in other investigations. Finally, the homogeneity in the distribution of TiO2 particles inside the reactor when stirred at 475 rpm was verified using a COMSOL Multiphysics computer fluid dynamics simulation, which showed the theoretical trajectory of particles inside the reactor depending on the stirring rate of the reactor.
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Affiliation(s)
- Yesid Murillo-Acevedo
- Grupo
de Investigación de Sólidos Porosos y Calorimetría,
Departamento de Química and Product and Processes Design Group, Departamento
de Ingeniería Química, Universidad
de los
Andes, Bogotá 111711, Colombia
| | - Jason Bernal-Sanchez
- Grupo
de Investigación de Sólidos Porosos y Calorimetría,
Departamento de Química and Product and Processes Design Group, Departamento
de Ingeniería Química, Universidad
de los
Andes, Bogotá 111711, Colombia
| | - Liliana Giraldo
- Grupo
de Calorimetría, Departamento de Química, Universidad Nacional de Colombia, Bogotá 111321, Colombia
| | - Rocio Sierra-Ramirez
- Grupo
de Investigación de Sólidos Porosos y Calorimetría,
Departamento de Química and Product and Processes Design Group, Departamento
de Ingeniería Química, Universidad
de los
Andes, Bogotá 111711, Colombia
| | - Juan Carlos Moreno-Piraján
- Grupo
de Investigación de Sólidos Porosos y Calorimetría,
Departamento de Química and Product and Processes Design Group, Departamento
de Ingeniería Química, Universidad
de los
Andes, Bogotá 111711, Colombia
- E-mail: . Tel: +57 339 49 49 Ext. 3465
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28
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Qian R, Zong H, Schneider J, Zhou G, Zhao T, Li Y, Yang J, Bahnemann DW, Pan JH. Charge carrier trapping, recombination and transfer during TiO2 photocatalysis: An overview. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.10.053] [Citation(s) in RCA: 231] [Impact Index Per Article: 46.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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29
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Kano S, Yang H, McGrady J, Ihara T, Hazuku T, Abe H. Wettability Recovery Behavior Governed by Desorption of Hydroxyl Species in Steel. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6830-6837. [PMID: 31064183 DOI: 10.1021/acs.langmuir.9b00260] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The radiation induced surface activation (RISA) effect which occurs at the bilayer of metal and oxide due to irradiation contributes to improving the materials surface wettability and enhancing electrothermal characteristics and corrosion resistance. The purpose of the present study is to reveal the correlation between the wettability recovery behavior and the microstructural features of the adsorbed water and/or hydroxyl species on the surfaces. The wettability change due to the RISA effect was investigated in the oxidized austenitic stainless steel with various holding times under darkness after UV irradiation. The microstructure features of the adsorbed water and/or hydroxyl species on the surfaces were characterized by Raman spectroscopy and scanning probe microscopy (SPM). Results show that the contact angle of the specimen after UV irradiation parabolically increased with increasing holding time, regardless of the chemical composition within these two steels. The absorbed water layer was observed in both specimens by Raman analysis, and its intensity decreased with increasing holding time. From the force-distance curves of SPM analysis, the hydrophilic component was rapidly decreased at a holding time below 200 h, then gradually saturated when the holding time increased above 200 h from the SPM analysis. These results reveal that the wettability recovery behavior in oxidized austenitic stainless steels after UV irradiation can be ascribed to two kinds of mechanisms. One is the desorption of the hydrophilic components which are predominant when the contact angle is less than 30°, and the other is the absorption of the hydrophobic components which works mainly when the contact angle is above 30°.
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Affiliation(s)
- Sho Kano
- Nuclear Professional School, School of Engineering , The University of Tokyo , Tokai-mura , Ibaraki 319-1188 , Japan
| | - Huilong Yang
- Nuclear Professional School, School of Engineering , The University of Tokyo , Tokai-mura , Ibaraki 319-1188 , Japan
| | - John McGrady
- Nuclear Professional School, School of Engineering , The University of Tokyo , Tokai-mura , Ibaraki 319-1188 , Japan
| | - Tomonori Ihara
- Department of Faculty of Marine Technology , Tokyo University of Marine Science and Technology , Tokyo 135-8533 , Japan
| | - Tatsuya Hazuku
- Department of Faculty of Marine Technology , Tokyo University of Marine Science and Technology , Tokyo 135-8533 , Japan
| | - Hiroaki Abe
- Nuclear Professional School, School of Engineering , The University of Tokyo , Tokai-mura , Ibaraki 319-1188 , Japan
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30
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Iyer A, Kearney K, Ertekin E. Computational Approaches to Photoelectrode Design through Molecular Functionalization for Enhanced Photoelectrochemical Water Splitting. CHEMSUSCHEM 2019; 12:1858-1871. [PMID: 30693653 DOI: 10.1002/cssc.201802514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/24/2018] [Indexed: 06/09/2023]
Abstract
Photoelectrochemical water splitting is a promising carbon-free approach to produce hydrogen from water. A photoelectrochemical cell consists of a semiconductor photoelectrode in contact with an aqueous electrolyte. Its performance is sensitive to properties of the photoelectrode/electrolyte interface, which may be tuned through functionalization of the photoelectrode surface with organic molecules. This can lead to improvements in the photoelectrode's properties. This Minireview summarizes key computational investigations on using molecular functionalization to modify photoelectrode stability, barrier height, and catalytic activity. It is discussed how first-principles density functional theory, first-principles molecular dynamics, and device modeling simulations can provide predictive insights and complement experimental investigations of functionalized photoelectrodes. Challenges and future directions in the computational modeling of functionalized photoelectrode/electrolyte interfaces within the context of experimental studies are also highlighted.
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Affiliation(s)
- Ashwathi Iyer
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 W Green Street, Urbana, Illinois, 61801, USA
- International Institute of Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan
- Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois, 61801, USA
| | - Kara Kearney
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 W Green Street, Urbana, Illinois, 61801, USA
- International Institute of Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan
- Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois, 61801, USA
| | - Elif Ertekin
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 W Green Street, Urbana, Illinois, 61801, USA
- International Institute of Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan
- Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois, 61801, USA
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31
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Kim M, Su Y, Aoshima T, Fukuoka A, Hensen EJM, Nakajima K. Effective Strategy for High-Yield Furan Dicarboxylate Production for Biobased Polyester Applications. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00450] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Minjune Kim
- Institute for Catalysis, Hokkaido University, Kita 21 Nishi 10, Kita-ku, Sapporo 001-0021, Japan
| | - Yaqiong Su
- Inorganic Materials Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Takayuki Aoshima
- Yokohama R&D Center, Mitsubishi Chemical Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi 227-8502, Japan
| | - Atsushi Fukuoka
- Institute for Catalysis, Hokkaido University, Kita 21 Nishi 10, Kita-ku, Sapporo 001-0021, Japan
| | - Emiel J. M. Hensen
- Inorganic Materials Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Kiyotaka Nakajima
- Institute for Catalysis, Hokkaido University, Kita 21 Nishi 10, Kita-ku, Sapporo 001-0021, Japan
- Advanced Low Carbon Technology Research and Development Program (ALCA), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi 332-0012, Japan
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32
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Chandrasekaran S, Kaeffer N, Cagnon L, Aldakov D, Fize J, Nonglaton G, Baleras F, Mailley P, Artero V. A robust ALD-protected silicon-based hybrid photoelectrode for hydrogen evolution under aqueous conditions. Chem Sci 2019; 10:4469-4475. [PMID: 31057774 PMCID: PMC6482884 DOI: 10.1039/c8sc05006f] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 03/11/2019] [Indexed: 01/09/2023] Open
Abstract
Hybrid systems combining molecular catalysts with inorganic materials is a promising solution towards cheap yet efficient and stable photoelectrochemical hydrogen production.
Hydrogen production through direct sunlight-driven water splitting in photo-electrochemical cells (PECs) is a promising solution for energy sourcing. PECs need to fulfill three criteria: sustainability, cost-effectiveness and stability. Here we report an efficient and stable photocathode platform for H2 evolution based on Earth-abundant elements. A p-type silicon surface was protected by atomic layer deposition (ALD) with a 15 nm TiO2 layer, on top of which a 300 nm mesoporous TiO2 layer was spin-coated. The cobalt diimine–dioxime molecular catalyst was covalently grafted onto TiO2 through phosphonate anchors and an additional 0.2 nm ALD-TiO2 layer was applied for stabilization. This assembly catalyzes water reduction into H2 in phosphate buffer (pH 7) with an onset potential of +0.47 V vs. RHE. The resulting current density is –1.3 ± 0.1 mA cm–2 at 0 V vs. RHE under AM 1.5 solar irradiation, corresponding to a turnover number of 260 per hour of operation and a turnover frequency of 0.071 s–1.
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Affiliation(s)
- Soundarrajan Chandrasekaran
- Université Grenoble Alpes , CNRS , CEA , Laboratoire de Chimie et Biologie des Métaux , 17 rue des Martyrs , 38000 Grenoble , France . .,Université Grenoble Alpes , CEA-LETI/DTBS , Laboratoire Chimie , Capteurs et Biomatériaux , 17 rue des Martyrs , 38000 Grenoble , France
| | - Nicolas Kaeffer
- Université Grenoble Alpes , CNRS , CEA , Laboratoire de Chimie et Biologie des Métaux , 17 rue des Martyrs , 38000 Grenoble , France .
| | - Laurent Cagnon
- Université Grenoble Alpes , CNRS , Institut NEEL , UPR2940 , 25 rue des Martyrs BP 166 , 38000 Grenoble , France
| | - Dmitry Aldakov
- Université Grenoble Alpes , CNRS , CEA , INAC-SyMMES , 38000 Grenoble , France
| | - Jennifer Fize
- Université Grenoble Alpes , CNRS , CEA , Laboratoire de Chimie et Biologie des Métaux , 17 rue des Martyrs , 38000 Grenoble , France .
| | - Guillaume Nonglaton
- Université Grenoble Alpes , CEA-LETI/DTBS , Laboratoire Chimie , Capteurs et Biomatériaux , 17 rue des Martyrs , 38000 Grenoble , France
| | - François Baleras
- Université Grenoble Alpes , CEA-LETI/DTBS , Laboratoire Chimie , Capteurs et Biomatériaux , 17 rue des Martyrs , 38000 Grenoble , France
| | - Pascal Mailley
- Université Grenoble Alpes , CEA-LETI/DTBS , Laboratoire Chimie , Capteurs et Biomatériaux , 17 rue des Martyrs , 38000 Grenoble , France
| | - Vincent Artero
- Université Grenoble Alpes , CNRS , CEA , Laboratoire de Chimie et Biologie des Métaux , 17 rue des Martyrs , 38000 Grenoble , France .
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33
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Parrino F, De Pasquale C, Palmisano L. Influence of Surface-Related Phenomena on Mechanism, Selectivity, and Conversion of TiO 2 -Induced Photocatalytic Reactions. CHEMSUSCHEM 2019; 12:589-602. [PMID: 30387918 DOI: 10.1002/cssc.201801898] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Revised: 09/28/2018] [Indexed: 06/08/2023]
Abstract
Heterogeneous photocatalysis is the result of an inextricable connection of several factors differently contributing to the overall process. Photon absorption is the "sine qua non" condition for the reaction to occur. In fact, photons can be considered as immaterial reactants, and all of the phenomena related to the interaction of light-matter play a prominent role. However, other factors contribute in a concerted way to address the reaction, so that the relative contribution of each of them is often difficult to evaluate. In this framework, the present paper highlights some aspects of the interaction of TiO2 surface-adsorbate species that could be underestimated and their influence on the conversion, selectivity, and mechanisms of photocatalytic reactions. To this aim, some paradigmatic examples on the adsorption of water and organics on TiO2 are reported.
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Affiliation(s)
- Francesco Parrino
- Dipartimento di Scienze Agrarie, Alimentari e Forestali, Università degli Studi di Palermo, viale delle Scienze 8, 90128, Palermo, Italy
- Dipartimento di Energia, Ingegneria dell'informazione e Modelli Matematici (DEIM), Università degli Studi di Palermo, viale delle Scienze Ed. 6, 90128, Palermo, Italy
- Dipartimento di Ingegneria Industriale (DII), Università di Trento, via Sommarive 9, 38123, Trento, Italy
| | - Claudio De Pasquale
- Dipartimento di Scienze Agrarie, Alimentari e Forestali, Università degli Studi di Palermo, viale delle Scienze 8, 90128, Palermo, Italy
| | - Leonardo Palmisano
- Dipartimento di Energia, Ingegneria dell'informazione e Modelli Matematici (DEIM), Università degli Studi di Palermo, viale delle Scienze Ed. 6, 90128, Palermo, Italy
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34
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Shahmoradi B, Yavari S, Zandsalimi Y, Shivaraju H, Negahdari M, Maleki A, Mckay G, Pawar RR, Lee SM. Optimization of solar degradation efficiency of bio-composting leachate using Nd: ZnO nanoparticles. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.01.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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35
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Shirai K, Fazio G, Sugimoto T, Selli D, Ferraro L, Watanabe K, Haruta M, Ohtani B, Kurata H, Di Valentin C, Matsumoto Y. Water-Assisted Hole Trapping at the Highly Curved Surface of Nano-TiO 2 Photocatalyst. J Am Chem Soc 2018; 140:1415-1422. [PMID: 29325412 PMCID: PMC5916465 DOI: 10.1021/jacs.7b11061] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Indexed: 11/30/2022]
Abstract
Heterogeneous photocatalysis is vital in solving energy and environmental issues that this society is confronted with. Although photocatalysts are often operated in the presence of water, it has not been yet clarified how the interaction with water itself affects charge dynamics in photocatalysts. Using water-coverage-controlled steady and transient infrared absorption spectroscopy and large-model (∼800 atoms) ab initio calculations, we clarify that water enhances hole trapping at the surface of TiO2 nanospheres but not of well-faceted nanoparticles. This water-assisted effect unique to the nanospheres originates from water adsorption as a ligand at a low-coordinated Ti-OH site or through robust hydrogen bonding directly to the terminal OH at the highly curved nanosphere surface. Thus, the interaction with water at the surface of nanospheres can promote photocatalytic reactions of both oxidation and reduction by elongating photogenerated carrier lifetimes. This morphology-dependent water-assisted effect provides a novel and rational basis for designing and engineering nanophotocatalyst morphology to improve photocatalytic performances.
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Affiliation(s)
- Kenji Shirai
- Graduate
School of Science, Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan
| | - Gianluca Fazio
- Dipartimento
di Scienza dei Materiali, Universitá
di Milano Bicocca, via R. Cozzi 55, Milano 20125, Italy
| | - Toshiki Sugimoto
- Graduate
School of Science, Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan
- PRESTO,
Japan Science and Technology Agency (JST), Honcho 4-1-8, Kawaguchi,
Saitama 332-0012, Japan
| | - Daniele Selli
- Dipartimento
di Scienza dei Materiali, Universitá
di Milano Bicocca, via R. Cozzi 55, Milano 20125, Italy
| | - Lorenzo Ferraro
- Dipartimento
di Scienza dei Materiali, Universitá
di Milano Bicocca, via R. Cozzi 55, Milano 20125, Italy
| | - Kazuya Watanabe
- Graduate
School of Science, Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan
| | - Mitsutaka Haruta
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Bunsho Ohtani
- Institute
for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | - Hiroki Kurata
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Cristiana Di Valentin
- Dipartimento
di Scienza dei Materiali, Universitá
di Milano Bicocca, via R. Cozzi 55, Milano 20125, Italy
| | - Yoshiyasu Matsumoto
- Graduate
School of Science, Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan
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36
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Litke A, Hensen EJM, Hofmann JP. Role of Dissociatively Adsorbed Water on the Formation of Shallow Trapped Electrons in TiO 2 Photocatalysts. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:10153-10162. [PMID: 28529675 PMCID: PMC5432959 DOI: 10.1021/acs.jpcc.7b01151] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 04/18/2017] [Indexed: 06/07/2023]
Abstract
The mismatch between short lifetimes of free charge carriers and slow kinetics of surface redox reactions substantially limits the efficiency of most photocatalytic systems. Hence, the knowledge of trapping and recombination of photogenerated electrons and holes at different time scales is key for a rational optimization of photocatalytic materials. In this study, we used subsecond time-resolved diffuse-reflectance FTIR spectroscopy to investigate how energy and intensity of the incident irradiation affect the dynamics of photogenerated charge carriers in TiO2 P25 photocatalysts subjected to different pretreatments and how shallow trapped electrons (STE) are formed under these conditions. Intensity-dependent measurements demonstrated that electrons and holes generated by 325 and 409 nm irradiation undergo bimolecular and trap-assisted recombination, respectively. Analysis of characteristic times of photogenerated electron absorption rise and decay indicated that the apparent charge carrier dynamics at the time scale of seconds to minutes relate to chemical trapping of photogenerated electrons and holes. The presence of dissociatively adsorbed water on the oxide surface was required for efficient STE formation. This suggests that STE form at the seconds-minutes time scale upon surface-mediated self-trapping of electrons.
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