1
|
Ospina-Acevedo F, Albiter LA, Bailey KO, Godínez-Salomón JF, Rhodes CP, Balbuena PB. Catalytic Activity and Electrochemical Stability of Ru 1-xM xO 2 (M = Zr, Nb, Ta): Computational and Experimental Study of the Oxygen Evolution Reaction. ACS APPLIED MATERIALS & INTERFACES 2024; 16:16373-16398. [PMID: 38502743 PMCID: PMC10995909 DOI: 10.1021/acsami.4c01408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 03/05/2024] [Indexed: 03/21/2024]
Abstract
We use computations and experiments to determine the effect of substituting zirconium, niobium, and tantalum within rutile RuO2 on the structure, oxygen evolution reaction (OER) mechanism and activity, and electrochemical stability. Calculated electronic structures altered by Zr, Nb, and Ta show surface regions of electron density depletion and accumulation, along with anisotropic lattice parameter shifts dependent on the substitution site, substituent, and concentration. Consistent with theory, X-ray photoelectron spectroscopy experiments show shifts in binding energies of O-2s, O-2p, and Ru-4d peaks due to the substituents. Experimentally, the substituted materials showed the presence of two phases with a majority phase that contains the metal substituent within the rutile phase and a second, smaller-percentage RuO2 phase. Our experimental analysis of OER activity shows Zr, Nb, and Ta substituents at 12.5 atom % induce lower activity relative to RuO2, which agrees with computing the average of all sites; however, Zr and Ta substitution at specific sites yields higher theoretical OER activity than RuO2, with Zr substitution suggesting an alternative OER mechanism. Metal dissolution predictions show the involvement of cooperative interactions among multiple surface sites and the electrolyte. Zr substitution at specific sites increases activation barriers for Ru dissolution, however, with Zr surface dissolution rates comparable to those of Ru. Experimental OER stability analysis shows lower Ru dissolution from synthesized RuO2 and Zr-substituted RuO2 compared to commercial RuO2 and comparable amounts of Zr and Ru dissolved from Zr-substituted RuO2, aligned with our calculations.
Collapse
Affiliation(s)
- Francisco Ospina-Acevedo
- Department
of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Luis A. Albiter
- Materials
Science, Engineering and Commercialization Program, Texas State University, San Marcos, Texas 78666, United States
| | - Kathleen O. Bailey
- Department
of Chemistry and Biochemistry, Texas State
University, San Marcos, Texas 78666, United States
| | | | - Christopher P. Rhodes
- Materials
Science, Engineering and Commercialization Program, Texas State University, San Marcos, Texas 78666, United States
- Department
of Chemistry and Biochemistry, Texas State
University, San Marcos, Texas 78666, United States
| | - Perla B. Balbuena
- Department
of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| |
Collapse
|
2
|
Metwally RA, El Nady J, Ebrahim S, El Sikaily A, El-Sersy NA, Sabry SA, Ghozlan HA. Biosynthesis, characterization and optimization of TiO 2 nanoparticles by novel marine halophilic Halomonas sp. RAM2: application of natural dye-sensitized solar cells. Microb Cell Fact 2023; 22:78. [PMID: 37085834 PMCID: PMC10122347 DOI: 10.1186/s12934-023-02093-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 04/11/2023] [Indexed: 04/23/2023] Open
Abstract
BACKGROUND Metal oxide nanoparticles (NPs) are becoming valuable due to their novel applications. The green synthesis of TiO2 NPs is more popular as a flexible and eco-friendly method compared to traditional chemical synthesis methods. TiO2 NPs are the most commonly used semiconductor in dye-sensitized solar cells (DSSCs). RESULTS The biogenic TiO2 NPs were produced extracellularly by the marine halophilic bacterium Halomonas sp. RAM2. Response surface methodology (RSM) was used to optimize the biosynthesis process, resulting in a starting TiO2 concentration of 0.031 M and a pH of 5 for 92 min (⁓15 nm). TiO2 NPs were well-characterized after the calcination process at different temperatures of 500, 600, 700 and 800 °C. Anatase TiO2 NPs (calcined at 500 °C) with a smaller surface area and a wider bandgap were nominated for use in natural dye-sensitized solar cells (NDSSCs). The natural dye used as a photosensitizer is a mixture of three carotenoids extracted from the marine bacterium Kocuria sp. RAM1. NDSSCs were evaluated under standard illumination. After optimization of the counter electrode, NDSSCBio(10) (10 layers) demonstrated the highest photoelectric conversion efficiency (η) of 0.44%, which was almost as good as NDSSCP25 (0.55%). CONCLUSION The obtained results confirmed the successful green synthesis of TiO2 NPs and suggested a novel use in combination with bacterial carotenoids in DSSC fabrication, which represents an initial step for further efficiency enhancement studies.
Collapse
Affiliation(s)
- Rasha A Metwally
- Marine Microbiology Lab., National Institute of Oceanography and Fisheries, NIOF, Alexandria, Egypt.
| | - Jehan El Nady
- Electronic Materials Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, Alexandria, Egypt
| | - Shaker Ebrahim
- Department of Materials Science, Institute of Graduate Studies and Research, Alexandria University, Alexandria, Egypt
| | - Amany El Sikaily
- Marine Pollution Lab., National Institute of Oceanography and Fisheries, NIOF, Alexandria, Egypt
| | - Nermeen A El-Sersy
- Marine Microbiology Lab., National Institute of Oceanography and Fisheries, NIOF, Alexandria, Egypt
| | - Soraya A Sabry
- Botany & Microbiology Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Hanan A Ghozlan
- Botany & Microbiology Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| |
Collapse
|
3
|
Zhu R, Tian SIP, Ren Z, Li J, Buonassisi T, Hippalgaonkar K. Predicting Synthesizability using Machine Learning on Databases of Existing Inorganic Materials. ACS OMEGA 2023; 8:8210-8218. [PMID: 36910925 PMCID: PMC9996807 DOI: 10.1021/acsomega.2c04856] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 12/07/2022] [Indexed: 06/02/2023]
Abstract
Defining the metric for synthesizability and predicting new compounds that can be experimentally realized in the realm of data-driven research is a pressing problem in contemporary materials science. The increasing computational power and advancements in machine learning (ML) algorithms provide a new avenue to solve the synthesizability challenge. In this work, using the Inorganic Crystal Structure Database (ICSD) and the Materials Project (MP) database, we represent crystal structures in Fourier-transformed crystal properties (FTCP) representation and use a deep learning model to predict synthesizability in the form of a synthesizability score (SC). Such an SC model, as a synthesizability filter for new materials, enables an efficient and accurate classification to identify promising material candidates. The SC prediction model achieved 82.6/80.6% (precision/recall) overall accuracy in predicting ternary crystal materials. We also trained the SC model by only considering compounds uploaded on the MP before 2015 as the training set and testing on multiple sets of materials uploaded after 2015. In the post-2019 test set, we obtain a high 88.60% true positive rate accuracy, coupled with 9.81% precision, indicating that newly added materials remain unexplored and have high synthesis potential. Further, we provide a list of 100 materials predicted to be synthesizable from this post-2019 dataset (highest SC) for future studies, and our SC model, as a validation filter, is beneficial for future material screening and discovery.
Collapse
Affiliation(s)
- Ruiming Zhu
- Institute
of Materials Research and Engineering, Agency
for Science, Technology and Research (A*STAR), Singapore 138634, Singapore
- Department
of Materials Science and Engineering, Nanyang
Technological University, Singapore 117575, Singapore
| | - Siyu Isaac Parker Tian
- Low
Energy Electronic Systems (LEES), Singapore-MIT
Alliance for Research and Technology (SMART), Singapore 138602, Singapore
| | - Zekun Ren
- Low
Energy Electronic Systems (LEES), Singapore-MIT
Alliance for Research and Technology (SMART), Singapore 138602, Singapore
- Xinterra
Pte Ltd., 77 Robinson
Road, Singapore 068896, Singapore
| | - Jiali Li
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore
| | - Tonio Buonassisi
- Low
Energy Electronic Systems (LEES), Singapore-MIT
Alliance for Research and Technology (SMART), Singapore 138602, Singapore
- Department
of Mechanical Engineering, Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139-4307, United States
| | - Kedar Hippalgaonkar
- Institute
of Materials Research and Engineering, Agency
for Science, Technology and Research (A*STAR), Singapore 138634, Singapore
- Department
of Materials Science and Engineering, Nanyang
Technological University, Singapore 117575, Singapore
| |
Collapse
|
4
|
Hammoud L, Strebler C, Toufaily J, Hamieh T, Keller V, Caps V. The role of the gold-platinum interface in AuPt/TiO 2-catalyzed plasmon-induced reduction of CO 2 with water. Faraday Discuss 2023; 242:443-463. [PMID: 36205304 DOI: 10.1039/d2fd00094f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Bimetallic gold-platinum nanoparticles have been widely studied in the fields of nanoalloys, catalysis and plasmonics. Many preparation methods can lead to the formation of these bimetallic nanoparticles (NPs), and the structure and related properties of the nanoalloy often depend on the preparation method used. Here we investigate the ability of thermal dimethylformamide (DMF) reduction to prepare bimetallic gold-platinum sub-nm clusters supported on titania. We find that deposition of Pt preferentially occurs on gold. Formation of sub-nm clusters (vs. NPs) appears to be dependent on the metal concentration used: clusters can be obtained for metal loadings up to 4 wt% but 7-8 nm NPs are formed for metal loadings above 8 wt%, as shown using high resolution transmission electron microscopy (HRTEM). X-ray photoelectron spectroscopy (XPS) shows electron-rich Au and Pt components in a pure metallic form and significant platinum enrichment of the surface, which increases with increasing Pt/Au ratio and suggests the presence of Au@Pt core-shell type structures. By contrast, titania-supported bimetallic particles (typically >7 nm) obtained by sodium borohydride (NaBH4) reduction in DMF, contain Au/Pt Janus-type objects in addition to oxidized forms of Pt as evidenced by HRTEM, which is in agreement with the lower Pt surface enrichment found by XPS. Both types of supported nanostructures contain a gold-platinum interface, as shown by the chemical interface damping, i.e. gold plasmon damping by Pt, found using UV-visible spectroscopy. Evaluation of the materials for plasmon-induced continuous flow CO2 reduction with water, shows that: (1) subnanometer metallic clusters are not suitable for CO2 reduction with water, producing hydrogen from the competing water reduction instead, thereby highlighting the plasmonic nature of the reaction; (2) the highest methane production rates are obtained for the highest Pt enrichments of the surface, i.e. the core-shell-like structures achieved by the thermal DMF reduction method; (3) selectivity towards CO2 reduction vs. the competing water reduction is enhanced by loading of the plasmonic NPs, i.e. coverage of the titania semi-conductor by plasmonic NPs. Full selectivity is achieved for loadings above 6 wt%, regardless of the NPs composition and alloy structure.
Collapse
Affiliation(s)
- Leila Hammoud
- ICPEES (CNRS UMR 7515/Université de Strasbourg), 25 rue Becquerel, 67087 Strasbourg, Cedex 02, France.
| | - Claire Strebler
- ICPEES (CNRS UMR 7515/Université de Strasbourg), 25 rue Becquerel, 67087 Strasbourg, Cedex 02, France.
| | - Joumana Toufaily
- Laboratory of Materials, Catalysis, Environment and Analytical Methods Laboratory (MCEMA), Faculty of Sciences, Lebanese University, Rafic Hariri Campus, Hadath, Lebanon
| | - Tayssir Hamieh
- Laboratory of Materials, Catalysis, Environment and Analytical Methods Laboratory (MCEMA), Faculty of Sciences, Lebanese University, Rafic Hariri Campus, Hadath, Lebanon.,Faculty of Science and Engineering, Maastricht University, 6200 MD, Maastrich, P.O. Box 616, The Netherlands
| | - Valérie Keller
- ICPEES (CNRS UMR 7515/Université de Strasbourg), 25 rue Becquerel, 67087 Strasbourg, Cedex 02, France.
| | - Valérie Caps
- ICPEES (CNRS UMR 7515/Université de Strasbourg), 25 rue Becquerel, 67087 Strasbourg, Cedex 02, France.
| |
Collapse
|
5
|
Quiñones Vélez G, Soto Nieves D, Castro Vázquez A, López-Mejías V. Polymorphic control in titanium dioxide particles. NANOSCALE ADVANCES 2023; 5:425-434. [PMID: 36756264 PMCID: PMC9846715 DOI: 10.1039/d2na00390b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 11/22/2022] [Indexed: 06/18/2023]
Abstract
The hydrolysis-condensation reaction of TiO2 was adapted to the phase inversion temperature (PIT)-nano-emulsion method as a low energy approach to gain control over the size and phase purity of the resulting metal oxide particles. Three different PIT-nano-emulsion syntheses were designed, each one intended to isolate high purity rutile, anatase, and brookite phase particles. Three different emulsion systems were prepared, with a pH of either strongly acidic (H2O : HNO3, pH ∼0.5), moderately acidic (H2O : isopropanol, pH ∼4.5), or alkaline (H2O : NaOH, pH ∼12). PIT-nano-emulsion syntheses of the amorphous TiO2 particles were conducted under these conditions, resulting in average particle diameter distributions of ∼140 d nm (strongly acidic), ∼60 d nm (moderately acidic), and ∼460 d nm (alkaline). Different thermal treatments were performed on the amorphous particles obtained from the PIT-nano-emulsion syntheses. Raman spectroscopy and powder X-ray diffraction (PXRD) were employed to corroborate that the thermally treated particles under H2O : HNO3 (at 850 °C), H2O : NaOH (at 400 °C), and H2O : isopropanol (at 200 °C) yielded highly-pure rutile, anatase, and brookite phases, respectively. Herein, an experimental approach based on the PIT-nano-emulsion method is demonstrated to synthesize phase-controlled TiO2 particles with high purity employing fewer toxic compounds, reducing the quantity of starting materials, and with a minimum energy input, particularly for the almost elusive brookite phase.
Collapse
Affiliation(s)
- Gabriel Quiñones Vélez
- Department of Chemistry, University of Puerto Rico Río Piedras San Juan Puerto Rico 00931 USA
- Crystallization Design Institute, Molecular Sciences Research Center, University of Puerto Rico San Juan 00926 Puerto Rico USA
| | - Diego Soto Nieves
- Department of Chemistry, University of Puerto Rico Río Piedras San Juan Puerto Rico 00931 USA
- Crystallization Design Institute, Molecular Sciences Research Center, University of Puerto Rico San Juan 00926 Puerto Rico USA
| | - Anushka Castro Vázquez
- Crystallization Design Institute, Molecular Sciences Research Center, University of Puerto Rico San Juan 00926 Puerto Rico USA
- Department of Accounting, University of Puerto Rico Río Piedras San Juan Puerto Rico 00931 USA
| | - Vilmalí López-Mejías
- Department of Chemistry, University of Puerto Rico Río Piedras San Juan Puerto Rico 00931 USA
- Crystallization Design Institute, Molecular Sciences Research Center, University of Puerto Rico San Juan 00926 Puerto Rico USA
| |
Collapse
|
6
|
Yang RX, McCandler CA, Andriuc O, Siron M, Woods-Robinson R, Horton MK, Persson KA. Big Data in a Nano World: A Review on Computational, Data-Driven Design of Nanomaterials Structures, Properties, and Synthesis. ACS NANO 2022; 16:19873-19891. [PMID: 36378904 PMCID: PMC9798871 DOI: 10.1021/acsnano.2c08411] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 11/08/2022] [Indexed: 05/30/2023]
Abstract
The recent rise of computational, data-driven research has significant potential to accelerate materials discovery. Automated workflows and materials databases are being rapidly developed, contributing to high-throughput data of bulk materials that are growing in quantity and complexity, allowing for correlation between structural-chemical features and functional properties. In contrast, computational data-driven approaches are still relatively rare for nanomaterials discovery due to the rapid scaling of computational cost for finite systems. However, the distinct behaviors at the nanoscale as compared to the parent bulk materials and the vast tunability space with respect to dimensionality and morphology motivate the development of data sets for nanometric materials. In this review, we discuss the recent progress in data-driven research in two aspects: functional materials design and guided synthesis, including commonly used metrics and approaches for designing materials properties and predicting synthesis routes. More importantly, we discuss the distinct behaviors of materials as a result of nanosizing and the implications for data-driven research. Finally, we share our perspectives on future directions for extending the current data-driven research into the nano realm.
Collapse
Affiliation(s)
- Ruo Xi Yang
- Materials
Science Division, Lawrence Berkeley National
Laboratory, Berkeley, California94720, United States
| | - Caitlin A. McCandler
- Materials
Science Division, Lawrence Berkeley National
Laboratory, Berkeley, California94720, United States
- Department
of Materials Science and Engineering, University
of California, Berkeley, California94720, United States
| | - Oxana Andriuc
- Department
of Chemistry, University of California, Berkeley, California94720, United States
- Liquid
Sunlight Alliance and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
| | - Martin Siron
- Materials
Science Division, Lawrence Berkeley National
Laboratory, Berkeley, California94720, United States
- Department
of Materials Science and Engineering, University
of California, Berkeley, California94720, United States
| | - Rachel Woods-Robinson
- Materials
Science Division, Lawrence Berkeley National
Laboratory, Berkeley, California94720, United States
| | - Matthew K. Horton
- Materials
Science Division, Lawrence Berkeley National
Laboratory, Berkeley, California94720, United States
- Department
of Materials Science and Engineering, University
of California, Berkeley, California94720, United States
| | - Kristin A. Persson
- Department
of Materials Science and Engineering, University
of California, Berkeley, California94720, United States
- Molecular
Foundry, Energy Sciences Area, Lawrence
Berkeley National Laboratory, Berkeley, California94720, United States
| |
Collapse
|
7
|
Kutlusoy T, Divanis S, Pittkowski R, Marina R, Frandsen A, Minhova-Macounova K, Nebel R, Zhao D, Mertens SFL, Hoster H, Krtil P, Rossmeisl J. Synergistic effect of p-type and n-type dopants in semiconductors for efficient electrocatalytic water splitting. Chem Sci 2022; 13:13879-13892. [PMID: 36544721 PMCID: PMC9710220 DOI: 10.1039/d2sc04585k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/04/2022] [Indexed: 11/16/2022] Open
Abstract
The main challenge for acidic water electrolysis is the lack of active and stable oxygen evolution catalysts based on abundant materials, which are globally scalable. Iridium oxide is the only material which is active and stable. However, Ir is extremely rare. While both active materials and stable materials exist, those that are active are usually not stable and vice versa. In this work, we present a new design strategy for activating stable materials originally deemed unsuitable due to a semiconducting nature and wide band gap energy. These stable semiconductors cannot change oxidation state under the relevant reaction conditions. Based on DFT calculations, we find that adding an n-type dopant facilitates oxygen binding on semiconductor surfaces. The binding is, however, strong and prevents further binding or desorption of oxygen. By combining both n-type and p-type dopants, the reactivity can be tuned so that oxygen can be adsorbed and desorbed under reaction conditions. The tuning results from the electrostatic interactions between the dopants as well as between the dopants and the binding site. This concept is experimentally verified on TiO2 by co-substituting with different pairs of n- and p-type dopants. Our findings suggest that the co-substitution approach can be used to activate stable materials, with no intrinsic oxygen evolution activity, to design new catalysts for acid water electrolysis.
Collapse
Affiliation(s)
- Tugce Kutlusoy
- Center of High Entropy Alloy Catalysis, Department of Chemistry, University of CopenhagenUniversitetsparken 5, København Ø2100CopenhagenDenmark
| | - Spyridon Divanis
- Center of High Entropy Alloy Catalysis, Department of Chemistry, University of CopenhagenUniversitetsparken 5, København Ø2100CopenhagenDenmark
| | - Rebecca Pittkowski
- Center of High Entropy Alloy Catalysis, Department of Chemistry, University of CopenhagenUniversitetsparken 5, København Ø2100CopenhagenDenmark,J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech RepublicDolejskova 3Prague 18223Czech Republic
| | - Riccardo Marina
- New Application Research, Research and Development Division, Industrie De Nora S.p.A.20134 MilanItaly
| | - Adrian M. Frandsen
- Center of High Entropy Alloy Catalysis, Department of Chemistry, University of CopenhagenUniversitetsparken 5, København Ø2100CopenhagenDenmark
| | - Katerina Minhova-Macounova
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech RepublicDolejskova 3Prague 18223Czech Republic
| | - Roman Nebel
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech RepublicDolejskova 3Prague 18223Czech Republic
| | - Dongni Zhao
- Department of Chemistry, Energy Lancaster and Materials Science Institute, Lancaster UniversityLancaster LA1 4YBUK
| | - Stijn F. L. Mertens
- Department of Chemistry, Energy Lancaster and Materials Science Institute, Lancaster UniversityLancaster LA1 4YBUK
| | - Harry Hoster
- Department of Chemistry, Energy Lancaster and Materials Science Institute, Lancaster UniversityLancaster LA1 4YBUK,Fakultät für Ingenieurwissenschaften, Lehrstuhl Energietechnik, Universität Duisburg-EssenLotharstra. 147048 DuisburgGermany
| | - Petr Krtil
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech RepublicDolejskova 3Prague 18223Czech Republic
| | - Jan Rossmeisl
- Center of High Entropy Alloy Catalysis, Department of Chemistry, University of CopenhagenUniversitetsparken 5, København Ø2100CopenhagenDenmark
| |
Collapse
|
8
|
Jasinski J, Lubas M, Suchorab K, Gawęda M, Kurpaska L, Brykala M, Kosinska A, Sitarz M, Jagielski J. Qualitative and semi-quantitative phase analysis of TiO2 thin layers by Raman imaging. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132803] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
9
|
TiO2/Au/TiO2 Plasmonic Photocatalysts: The Influence of Titania Matrix and Gold Properties. INVENTIONS 2022. [DOI: 10.3390/inventions7030054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Plasmonic photocatalysts have gained more and more attention because of possible applications for solar energy conversion, environmental decontamination, and water treatment. However, the activity under visible light is usually very low, and the property-governed activity as well as the mechanisms are not fully understood yet. Accordingly, this study examines four different titania photocatalysts (anatase and rutile with fine and large crystallites) modified with gold by photodeposition. Three kinds of samples were prepared, as follows: (i) gold-modified titania (Au/TiO2), (ii) physically mixed Au/TiO2 samples (Au/TiO2(1) + Au/TiO2(2)), and (iii) Au/(TiO2(1) + Au/TiO2(2)) samples, prepared by subsequent deposition of gold on the mixture of bare and gold-modified titania. In total, twelve samples were prepared and well characterized, including diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning transmission electron microscopy (STEM). The photocatalytic activity was examined in three reaction systems: (i) methanol dehydrogenation during gold photodeposition under UV/vis irradiation, (ii) oxidative decomposition of acetic acid (UV/vis), and (iii) oxidation of 2-propanol to acetone under visible light irradiation (λ > 450 nm). It was found that during subsequent deposition, gold is mainly formed on the surface of pre-deposited Au nanoparticles (NPs), localized on fine titania NPs, through the electrostatic attractions (negatively charged gold resulting from photogenerated electrons’ accumulation). This gold aggregation, though detrimental for UV activity (many “naked” large titania with low activity), is highly beneficial for vis activity because of efficient light harvesting and increased interface between gold and titania (gold deposits surrounded by fine titania NPs). Moreover, it was found that rutile is more active than anatase for plasmonic photocatalysis, probably due to easier electron transfer from gold via titania to adsorbed oxygen (more negative conduction band), which might hinder the back reaction (electron transfer: Au→TiO2→Au).
Collapse
|
10
|
Ament S, Amsler M, Sutherland DR, Chang MC, Guevarra D, Connolly AB, Gregoire JM, Thompson MO, Gomes CP, van Dover RB. Autonomous materials synthesis via hierarchical active learning of nonequilibrium phase diagrams. SCIENCE ADVANCES 2021; 7:eabg4930. [PMID: 34919429 PMCID: PMC8682983 DOI: 10.1126/sciadv.abg4930] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Autonomous experimentation enabled by artificial intelligence offers a new paradigm for accelerating scientific discovery. Nonequilibrium materials synthesis is emblematic of complex, resource-intensive experimentation whose acceleration would be a watershed for materials discovery. We demonstrate accelerated exploration of metastable materials through hierarchical autonomous experimentation governed by the Scientific Autonomous Reasoning Agent (SARA). SARA integrates robotic materials synthesis using lateral gradient laser spike annealing and optical characterization along with a hierarchy of AI methods to map out processing phase diagrams. Efficient exploration of the multidimensional parameter space is achieved with nested active learning cycles built upon advanced machine learning models that incorporate the underlying physics of the experiments and end-to-end uncertainty quantification. We demonstrate SARA’s performance by autonomously mapping synthesis phase boundaries for the Bi2O3 system, leading to orders-of-magnitude acceleration in the establishment of a synthesis phase diagram that includes conditions for stabilizing δ-Bi2O3 at room temperature, a critical development for electrochemical technologies.
Collapse
Affiliation(s)
- Sebastian Ament
- Department of Computer Science, Cornell University, Ithaca, NY 14853, USA
| | - Maximilian Amsler
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
- Corresponding author. (M.A.); (C.P.G.)
| | - Duncan R. Sutherland
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Ming-Chiang Chang
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Dan Guevarra
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125, USA
| | - Aine B. Connolly
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA
| | - John M. Gregoire
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125, USA
| | - Michael O. Thompson
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Carla P. Gomes
- Department of Computer Science, Cornell University, Ithaca, NY 14853, USA
- Corresponding author. (M.A.); (C.P.G.)
| | - R. Bruce van Dover
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA
| |
Collapse
|
11
|
Kohlrausch EC, Dos Reis R, Lodge RW, Vicente I, Brolo AG, Dupont J, Alves Fernandes J, Santos MJL. Selective suppression of {112} anatase facets by fluorination for enhanced TiO 2 particle size and phase stability at elevated temperatures. NANOSCALE ADVANCES 2021; 3:6223-6230. [PMID: 36133950 PMCID: PMC9419165 DOI: 10.1039/d1na00528f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 08/26/2021] [Indexed: 06/16/2023]
Abstract
Generally, anatase is the most desirable TiO2 polymorphic phase for photovoltaic and photocatalytic applications due to its higher photoconductivity and lower recombination rates compared to the rutile phase. However, in applications where temperatures above 500 °C are required, growing pure anatase phase nanoparticles is still a challenge, as above this temperature TiO2 crystallite sizes are larger than 35 nm which thermodynamically favors the growth of rutile crystallites. In this work, we show strong evidence, for the first time, that achieving a specific fraction (50%) of the {112} facets on the TiO2 surface is the key limiting step for anatase-to-rutile phase transition, rather than the crystallite size. By using a fluorinated ionic liquid (IL) we have obtained pure anatase phase crystallites at temperatures up to 800 °C, even after the crystallites have grown beyond their thermodynamic size limit of ca. 35 nm. While fluorination by the IL did not affect {001} growth, it stabilized the pure anatase TiO2 by suppressing the formation of {112} facets on anatase particles. By suppressing the {112} facets, using specific concentrations of fluorinated ionic liquid in the TiO2 synthesis, we controlled the anatase-to-rutile phase transition over a wide range of temperatures. This information shall help synthetic researchers to determine the appropriate material conditions for specific applications.
Collapse
Affiliation(s)
- Emerson C Kohlrausch
- Instituto de Química - UFRGS 91501-970 Porto Alegre RS Brazil
- School of Chemistry, University of Nottingham, University Park Nottingham NG7 2RD UK
| | - Roberto Dos Reis
- Department of Materials Science and Engineering, Northwestern University Evanston Illinois 60208 USA
| | - Rhys W Lodge
- School of Chemistry, University of Nottingham, University Park Nottingham NG7 2RD UK
| | - Isabel Vicente
- Unitat de Tecnologíe Químiques, EURECAT Tarragona 43007 Spain
| | - Alexandre G Brolo
- Department of Chemistry, University of Victoria P. O. Box 3065 V8W 3V6 BC Canada
| | - Jairton Dupont
- Instituto de Química - UFRGS 91501-970 Porto Alegre RS Brazil
| | - Jesum Alves Fernandes
- School of Chemistry, University of Nottingham, University Park Nottingham NG7 2RD UK
| | | |
Collapse
|
12
|
Fedoseev VB. Size Effects in Delamination of Poly(methyl methacrylate)–Acetone–Hexane Solution. POLYMER SCIENCE SERIES A 2021. [DOI: 10.1134/s0965545x21050047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
13
|
Fasolini A, Lombardi E, Tabanelli T, Basile F. Microemulsion Derived Titania Nanospheres: An Improved Pt Supported Catalyst for Glycerol Aqueous Phase Reforming. NANOMATERIALS 2021; 11:nano11051175. [PMID: 33947102 PMCID: PMC8144991 DOI: 10.3390/nano11051175] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/23/2021] [Accepted: 04/25/2021] [Indexed: 11/23/2022]
Abstract
Glycerol aqueous phase reforming (APR) produces hydrogen and interesting compounds at relatively mild temperatures. Among APR catalysts investigated in literature, little attention has been given to Pt supported on TiO2. Therefore, herein we propose an innovative titania support which can be obtained through an optimized microemulsion technique. This procedure provided high surface area titania nanospheres, with a peculiar high density of weak acidic sites. The material was tested in the catalytic glycerol APR after Pt deposition. A mechanism hypothesis was drawn, which evidenced the pathways giving the main products. When compared with a commercial TiO2 support, the synthetized titania provided higher hydrogen selectivity and glycerol conversion thanks to improved catalytic activity and ability to prompt consecutive dehydrogenation reactions. This was correlated to an enhanced cooperation between Pt nanoparticles and the acid sites of the support.
Collapse
|
14
|
Delgado LP, Figueroa-Torres MZ, Ceballos-Chuc MC, García-Rodríguez R, Alvarado-Gil JJ, Oskam G, Rodriguez-Gattorno G. "Tailoring the TiO 2 phases through microwave-assisted hydrothermal synthesis: Comparative assessment of bactericidal activity". MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 117:111290. [PMID: 32919651 DOI: 10.1016/j.msec.2020.111290] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 06/26/2020] [Accepted: 07/12/2020] [Indexed: 11/15/2022]
Abstract
Nanocrystalline titania (TiO2) is one of the most investigated crystalline nanostructured systems in the field of materials science. The technological applications of this material are related to its optoelectronic and photocatalytic properties, which in turn are strongly dependent on the crystal phase (i.e., anatase, brookite, and rutile), particle size, and surface structure. However, systematic comparative studies of all its crystal phases are scarce in literature due to difficulties in providing a controlled synthesis, which is primarily important in obtaining the brookite phase. In this report, the synthesis of TiO2 nanoparticles in the anatase, brookite, and rutile structures was explored, using amorphous TiO2 as a common precursor under microwave-assisted hydrothermal conditions. The influence of parameters such as temperature, acidity, and precursor concentration on phase crystallization were investigated. The TiO2 materials (amorphous and crystalline phases as well as commercial Degussa P25) were systematically characterized using Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, UV-visible reflectance spectroscopy, and dynamic and electrophoretic light scattering. The bactericidal activity and photocatalytic antibacterial effectiveness of each material were evaluated through the determination of the minimum inhibitory and bactericidal concentrations, and via the mortality kinetic method under ultraviolet (UV) illumination under similar conditions with two bacterial groups of unique cellular structures: Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus). The results are discussed with particular emphasis on the relationship between the synthesis parameters (acidity, precursor concentration, temperature and reaction time) and the bactericidal properties.
Collapse
Affiliation(s)
- L P Delgado
- Departamento de Física Aplicada, CINVESTAV-I. P. N., Cordemex, 97310 Mérida, Yucatán, Mexico
| | - M Z Figueroa-Torres
- Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil-IIC, San Nicolás de Los Garza, Nuevo León 66455, Mexico
| | - M C Ceballos-Chuc
- Departamento de Física Aplicada, CINVESTAV-I. P. N., Cordemex, 97310 Mérida, Yucatán, Mexico
| | - R García-Rodríguez
- Departamento de Física Aplicada, CINVESTAV-I. P. N., Cordemex, 97310 Mérida, Yucatán, Mexico
| | - J J Alvarado-Gil
- Departamento de Física Aplicada, CINVESTAV-I. P. N., Cordemex, 97310 Mérida, Yucatán, Mexico
| | - G Oskam
- Departamento de Física Aplicada, CINVESTAV-I. P. N., Cordemex, 97310 Mérida, Yucatán, Mexico
| | - G Rodriguez-Gattorno
- Departamento de Física Aplicada, CINVESTAV-I. P. N., Cordemex, 97310 Mérida, Yucatán, Mexico.
| |
Collapse
|
15
|
|
16
|
Singh A, Salminen T, Honkanen M, Nikkanen JP, Vuorinen T, Kari R, Vihinen J, Levänen E. Carbon coated TiO 2 nanoparticles prepared by pulsed laser ablation in liquid, gaseous and supercritical CO 2. NANOTECHNOLOGY 2019; 31:085602. [PMID: 31675742 DOI: 10.1088/1361-6528/ab53ba] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report on the synthesis of TiO2 nanoparticles using nanosecond pulse laser ablation of titanium in liquid, gaseous and supercritical CO2. The produced particles were observed to be mainly anatase-TiO2 with some rutile-TiO2. In addition, the particles were covered by a carbon layer. Raman and x-ray diffraction data suggested that the rutile content increases with CO2 pressure. The nanoparticle size decreased and size distribution became narrower with the increase in CO2 pressure and temperature, however the variation trend was different for CO2 pressure compared to temperature. Pulsed laser ablation in pressurized CO2 is demonstrated as a single step method for making anatase-TiO2/carbon nanoparticles throughout the pressure and temperature ranges 5-40 MPa and 30 °C-50 °C, respectively.
Collapse
Affiliation(s)
- Amandeep Singh
- Materials Science and Environmental Engineering Unit, Faculty of Engineering and Natural Sciences, PO Box 527 FI-33014, Tampere University, Tampere, Finland
| | | | | | | | | | | | | | | |
Collapse
|
17
|
Kundu A, Mondal A. Photodegradation of methylene blue under direct sunbeams by synthesized anatase titania nanoparticles. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-0280-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
|
18
|
Zhao Z, Long Y, Luo S, Wu W, Ma J. Preparation of a magnetic mesoporous Fe3O4–Pd@TiO2 photocatalyst for the efficient selective reduction of aromatic cyanides. NEW J CHEM 2019. [DOI: 10.1039/c8nj06508j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fe3O4–Pd@TiO2 exhibited extremely superior photocatalytic activity for the selective reduction of aromatic cyanides to aromatic primary amines.
Collapse
Affiliation(s)
- Ziming Zhao
- State Key Laboratory of Applied Organic Chemistry (SKLAOC)
- The Key Laboratory of Catalytic Engineering of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
| | - Yu Long
- State Key Laboratory of Applied Organic Chemistry (SKLAOC)
- The Key Laboratory of Catalytic Engineering of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
| | - Sha Luo
- State Key Laboratory of Applied Organic Chemistry (SKLAOC)
- The Key Laboratory of Catalytic Engineering of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
| | - Wei Wu
- State Key Laboratory of Applied Organic Chemistry (SKLAOC)
- The Key Laboratory of Catalytic Engineering of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
| | - Jiantai Ma
- State Key Laboratory of Applied Organic Chemistry (SKLAOC)
- The Key Laboratory of Catalytic Engineering of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
| |
Collapse
|
19
|
Rosman N, Salleh WNW, Ismail AF, Jaafar J, Harun Z, Aziz F, Mohamed MA, Ohtani B, Takashima M. Photocatalytic degradation of phenol over visible light active ZnO/Ag2CO3/Ag2O nanocomposites heterojunction. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.06.029] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
20
|
Glancing Angle Deposition Effect on Structure and Light-Induced Wettability of RF-Sputtered TiO₂ Thin Films. MICROMACHINES 2018; 9:mi9080389. [PMID: 30424322 PMCID: PMC6187567 DOI: 10.3390/mi9080389] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 07/19/2018] [Accepted: 07/31/2018] [Indexed: 12/04/2022]
Abstract
Crystalline TiO2 films were prepared on unheated glass substrates by radio frequency (RF) reactive magnetron sputtering at normal angle of incidence (a = 0°) and at glancing angle (a = 87°). The effect of the glancing angle on the structure, microstructure, and wetting properties of the films was investigated. The inclination of the substrate led to phase transformation of the deposited films from rutile to either rutile/anatase or anatase, depending on the working pressure. Extreme shadowing at 87° results in a remarkable increase of the films’ porosity and surface roughness. The mechanism of the glancing-angle-induced crystalline phase formation is thoroughly discussed based on the thermodynamic, kinetic, and geometrical aspects of the nucleation and is related with the microstructural changes. Both crystalline phase and microstructure significantly affect the wetting properties of the TiO2 films. Glancing-angle-deposited anatase TiO2 exhibits a high degree of porosity and roughness, a high rate of UV-induced wettability conversion, and a long-term highly hydrophilic nature in dark. Therefore, anatase TiO2 is potentially a good candidate for applications as dye-sensitized solar cells (DSSC)/perovskite solar cells, microfluidic devices, and self-cleaning surfaces prepared on thermosensitive substrates.
Collapse
|
21
|
Zhang B, Zhu T, Ou M, Rowell N, Fan H, Han J, Tan L, Dove MT, Ren Y, Zuo X, Han S, Zeng J, Yu K. Thermally-induced reversible structural isomerization in colloidal semiconductor CdS magic-size clusters. Nat Commun 2018; 9:2499. [PMID: 29950666 PMCID: PMC6021431 DOI: 10.1038/s41467-018-04842-0] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 05/30/2018] [Indexed: 01/22/2023] Open
Abstract
Structural isomerism of colloidal semiconductor nanocrystals has been largely unexplored. Here, we report one pair of structural isomers identified for colloidal nanocrystals which exhibit thermally-induced reversible transformations behaving like molecular isomerization. The two isomers are CdS magic-size clusters with sharp absorption peaks at 311 and 322 nm. They have identical cluster masses, but slightly different structures. Furthermore, their interconversions follow first-order unimolecular reaction kinetics. We anticipate that such isomeric kinetics are applicable to a variety of small-size functional nanomaterials, and that the methodology developed for our kinetic study will be helpful to investigate and exploit solid–solid transformations in other semiconductor nanocrystals. The findings on structural isomerism should stimulate attention toward advanced design and synthesis of functional nanomaterials enabled by structural transformations. Few structural isomers of colloids, with identical masses but different structures, have been identified. Here, the authors observe an interesting example of structural isomerism in a pair of semiconductor magic-size clusters, which reversibly transform between one another with first-order unimolecular reaction kinetics.
Collapse
Affiliation(s)
- Baowei Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, 610065, Chengdu, PR China
| | - Tingting Zhu
- Institute of Atomic and Molecular Physics, Sichuan University, 610065, Chengdu, PR China
| | - Mingyang Ou
- School of Materials Science and Engineering, Huazhong University of Science & Technology, 430074, Wuhan, PR China
| | - Nelson Rowell
- National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada
| | - Hongsong Fan
- Engineering Research Center in Biomaterials, Sichuan University, 610065, Chengdu, PR China
| | - Jiantao Han
- School of Materials Science and Engineering, Huazhong University of Science & Technology, 430074, Wuhan, PR China
| | - Lei Tan
- School of Physics and Astronomy, Queen Mary University of London, London, E1 4NS, UK
| | - Martin T Dove
- School of Physics and Astronomy, Queen Mary University of London, London, E1 4NS, UK.,School of Physical Science and Technology, Sichuan University, 610065, Chengdu, PR China
| | - Yang Ren
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Xiaobing Zuo
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Shuo Han
- Institute of Atomic and Molecular Physics, Sichuan University, 610065, Chengdu, PR China.
| | - Jianrong Zeng
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 201204, Shanghai, PR China.
| | - Kui Yu
- Institute of Atomic and Molecular Physics, Sichuan University, 610065, Chengdu, PR China. .,Engineering Research Center in Biomaterials, Sichuan University, 610065, Chengdu, PR China. .,School of Chemical Engineering, Sichuan University, 610065, Chengdu, PR China.
| |
Collapse
|
22
|
Ali S, Granbohm H, Lahtinen J, Hannula SP. Titania nanotubes prepared by rapid breakdown anodization for photocatalytic decolorization of organic dyes under UV and natural solar light. NANOSCALE RESEARCH LETTERS 2018; 13:179. [PMID: 29900489 PMCID: PMC5999600 DOI: 10.1186/s11671-018-2591-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 06/04/2018] [Indexed: 06/08/2023]
Abstract
Titania nanotube (TNT) powder was prepared by rapid breakdown anodization (RBA) in a perchloric acid electrolyte. The photocatalytic efficiency of the as-prepared and powders annealed at temperatures between 250 and 550 °C was tested under UV and natural sunlight irradiation by decolorization of both anionic and cationic organic dyes, i.e., methyl orange (MO) and rhodamine B (RhB), as model pollutants. The tubular structure of the nanotubes was retained up to 250 °C, while at 350 °C and above, the nanotubes transformed into nanorods and nanoparticles. Depending on the annealing temperature, the TNTs consist of anatase, mixed anatase/brookite, or anatase/rutile phases. The bandgap of the as-prepared nanotubes is 3.04 eV, and it shifts towards the visible light region upon annealing. The X-ray photoelectron spectroscopy (XPS) results show the presence of titania and impurities including chlorine on the surface of the TNTs. The atomic ratio of Ti/O remains unchanged for the annealed TNTs, but the concentration of chlorine decreases with temperature. The photoluminescence (PL) indicate high electron-hole recombination for the as-prepared TNTs, probably due to the residual impurities, low crystallinity, and vacancies in the structure, while the highest photocurrent was observed for the TNT sample annealed at 450 °C. The TNTs induce a small degradation of the dyes under UV light; however, contrary to previous reports, complete decolorization of dyes is observed under sunlight. All TNT samples showed higher decolorization rates under sunlight irradiation than under UV light. The highest reaction rate for the TNT samples was obtained for the as-prepared TNT powder sample under sunlight using RhB (κ1 = 1.29 h-1). This is attributed to the bandgap, specific surface area and the crystal structure of the nanotubes. The as-prepared TNTs performed most efficiently for decolorization of RhB and outperformed the reference anatase powder under sunlight irradiation. This could be attributed to the abundance of reactive sites, higher specific surface area, and degradation mechanism of RhB. These RBA TNT photocatalyst powders demonstrate a more efficient use of the sunlight spectrum, making them viable for environmental remediation.
Collapse
Affiliation(s)
- Saima Ali
- Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering, P.O. Box 16100, FI-00076 Espoo, Finland
| | - Henrika Granbohm
- Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering, P.O. Box 16100, FI-00076 Espoo, Finland
| | - Jouko Lahtinen
- Department of Applied Physics, School of Science, Aalto University, P.O. Box 15100, FI 00076 Espoo, Finland
| | - Simo-Pekka Hannula
- Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering, P.O. Box 16100, FI-00076 Espoo, Finland
| |
Collapse
|
23
|
Kim J, Baczewski AT, Beaudet TD, Benali A, Bennett MC, Berrill MA, Blunt NS, Borda EJL, Casula M, Ceperley DM, Chiesa S, Clark BK, Clay RC, Delaney KT, Dewing M, Esler KP, Hao H, Heinonen O, Kent PRC, Krogel JT, Kylänpää I, Li YW, Lopez MG, Luo Y, Malone FD, Martin RM, Mathuriya A, McMinis J, Melton CA, Mitas L, Morales MA, Neuscamman E, Parker WD, Pineda Flores SD, Romero NA, Rubenstein BM, Shea JAR, Shin H, Shulenburger L, Tillack AF, Townsend JP, Tubman NM, Van Der Goetz B, Vincent JE, Yang DC, Yang Y, Zhang S, Zhao L. QMCPACK: an open source ab initio quantum Monte Carlo package for the electronic structure of atoms, molecules and solids. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:195901. [PMID: 29582782 DOI: 10.1088/1361-648x/aab9c3] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
QMCPACK is an open source quantum Monte Carlo package for ab initio electronic structure calculations. It supports calculations of metallic and insulating solids, molecules, atoms, and some model Hamiltonians. Implemented real space quantum Monte Carlo algorithms include variational, diffusion, and reptation Monte Carlo. QMCPACK uses Slater-Jastrow type trial wavefunctions in conjunction with a sophisticated optimizer capable of optimizing tens of thousands of parameters. The orbital space auxiliary-field quantum Monte Carlo method is also implemented, enabling cross validation between different highly accurate methods. The code is specifically optimized for calculations with large numbers of electrons on the latest high performance computing architectures, including multicore central processing unit and graphical processing unit systems. We detail the program's capabilities, outline its structure, and give examples of its use in current research calculations. The package is available at http://qmcpack.org.
Collapse
Affiliation(s)
- Jeongnim Kim
- Intel Corporation, Hillsboro, OR 987124, United States of America
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Vejerano EP, Rao G, Khachatryan L, Cormier SA, Lomnicki S. Environmentally Persistent Free Radicals: Insights on a New Class of Pollutants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:2468-2481. [PMID: 29443514 PMCID: PMC6497067 DOI: 10.1021/acs.est.7b04439] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Environmentally persistent free radicals, EPFRs, exist in significant concentration in atmospheric particulate matter (PM). EPFRs are primarily emitted from combustion and thermal processing of organic materials, in which the organic combustion byproducts interact with transition metal-containing particles to form a free radical-particle pollutant. While the existence of persistent free radicals in combustion has been known for over half-a-century, only recently that their presence in environmental matrices and health effects have started significant research, but still in its infancy. Most of the experimental studies conducted to understand the origin and nature of EPFRs have focused primarily on nanoparticles that are supported on a larger micrometer-sized particle that mimics incidental nanoparticles formed during combustion. Less is known on the extent by which EPFRs may form on engineered nanomaterials (ENMs) during combustion or thermal treatment. In this critical and timely review, we summarize important findings on EPFRs and discuss their potential to form on pristine ENMs as a new research direction. ENMs may form EPFRs that may differ in type and concentration compared to nanoparticles that are supported on larger particles. The lack of basic data and fundamental knowledge about the interaction of combustion byproducts with ENMs under high-temperature and oxidative conditions present an unknown environmental and health burden. Studying the extent of ENMs on catalyzing EPFRs is important to address the hazards of atmospheric PM fully from these emerging environmental contaminants.
Collapse
Affiliation(s)
- Eric P. Vejerano
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia South Carolina 29208, United States
- Corresponding Author: Phone: (803) 777 6360;
| | - Guiying Rao
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia South Carolina 29208, United States
| | - Lavrent Khachatryan
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Stephania A. Cormier
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, United States
- Comparative Biomedical Sciences, Louisiana State University School of Veterinary Medicine, Baton Rouge, Louisiana 70803, United States
| | - Slawo Lomnicki
- Department of Environmental Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| |
Collapse
|
25
|
SPR effect of AgNPs decorated TiO 2 in DSSC using TPMPI in the electrolyte: Approach towards low light trapping. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.05.051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
26
|
Tung Nguyen T, Mai XD, Duong NH. Simultaneous Synthesis of Anatase Colloidal and Multiple-branched Rutile TiO 2Nanostructures. B KOREAN CHEM SOC 2017. [DOI: 10.1002/bkcs.11101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Trong Tung Nguyen
- School of Engineering Physics; Hanoi University of Science and Technology; Hanoi 112400 Vietnam
- College of Television; Hanoi 158500 Vietnam
| | - Xuan-Dung Mai
- Department of Chemistry; Hanoi Pedagogical University No2; Vinh Phuc Vietnam
| | - Ngoc Huyen Duong
- School of Engineering Physics; Hanoi University of Science and Technology; Hanoi 112400 Vietnam
| |
Collapse
|
27
|
Razavi-Khosroshahi H, Edalati K, Emami H, Akiba E, Horita Z, Fuji M. Optical Properties of Nanocrystalline Monoclinic Y2O3 Stabilized by Grain Size and Plastic Strain Effects via High-Pressure Torsion. Inorg Chem 2017; 56:2576-2580. [DOI: 10.1021/acs.inorgchem.6b02725] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | - Masayoshi Fuji
- Advanced Ceramics
Research Center, Nagoya Institute of Technology, Gifu, Japan
| |
Collapse
|
28
|
KIMOTO A. Development of π-Conjugated Polymer Complexes and Their Application to Organic Electronics. KOBUNSHI RONBUNSHU 2017. [DOI: 10.1295/koron.2017-0025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
29
|
Kolay A, Kumar PN, Kumar SK, Deepa M. Titanium oxide morphology controls charge collection efficiency in quantum dot solar cells. Phys Chem Chem Phys 2017; 19:4607-4617. [DOI: 10.1039/c6cp07364f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Charge transfer at the TiO2/quantum dot (QD) interface, charge collection at the TiO2/QD/current collector (FTO or SnO2:F) interface, and back electron transfer at the TiO2/QDs/S2− interface are processes controlled by the electron transport layer or TiO2.
Collapse
Affiliation(s)
- Ankita Kolay
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Kandi-502285
- India
| | - P. Naresh Kumar
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Kandi-502285
- India
| | - Sarode Krishna Kumar
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Kandi-502285
- India
| | - Melepurath Deepa
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Kandi-502285
- India
| |
Collapse
|
30
|
Affiliation(s)
- Zhixun Luo
- State
Key Laboratory for Structural Chemistry of Unstable and Stable Species,
Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - A. W. Castleman
- Departments
of Chemistry and Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Shiv N. Khanna
- Department
of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| |
Collapse
|
31
|
Characterization of ZnO–TiO2 and zinc titanate nanoparticles synthesized by hydrothermal process. RESEARCH ON CHEMICAL INTERMEDIATES 2016. [DOI: 10.1007/s11164-016-2818-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
32
|
Vasilevskaia AK, Popkov VI, Valeeva AA, Rempel’ AA. Formation of nonstoichiometric titanium oxides nanoparticles Ti n O2n–1 upon heat-treatments of titanium hydroxide and anatase nanoparticles in a hydrogen flow. RUSS J APPL CHEM+ 2016. [DOI: 10.1134/s1070427216080012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
33
|
|
34
|
C-doped mesoporous anatase TiO 2 comprising 10 nm crystallites. J Colloid Interface Sci 2016; 476:1-8. [PMID: 27179173 DOI: 10.1016/j.jcis.2016.01.080] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 01/27/2016] [Accepted: 01/30/2016] [Indexed: 11/30/2022]
|
35
|
Dam T, Jena SS, Pradhan DK. Equilibrium state of anatase to rutile transformation for nano-structured Titanium Dioxide powder using polymer template method. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1757-899x/115/1/012038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
36
|
Shejale KP, Laishram D, Sharma RK. High-performance dye-sensitized solar cell using dimensionally controlled titania synthesized at sub-zero temperatures. RSC Adv 2016. [DOI: 10.1039/c6ra00227g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The subject of the current study is a concoct of anatase and rutile mixed phase titania synthesized at −40 °C and −10 °C.
Collapse
Affiliation(s)
- Kiran P. Shejale
- Department of Chemistry
- Indian Institute of Technology Jodhpur
- Jodhpur
- India
| | - Devika Laishram
- Department of Chemistry
- Indian Institute of Technology Jodhpur
- Jodhpur
- India
| | - Rakesh K. Sharma
- Department of Chemistry
- Indian Institute of Technology Jodhpur
- Jodhpur
- India
| |
Collapse
|
37
|
Ashiri R. On the solid-state formation of BaTiO3 nanocrystals from mechanically activated BaCO3 and TiO2 powders: innovative mechanochemical processing, the mechanism involved, and phase and nanostructure evolutions. RSC Adv 2016. [DOI: 10.1039/c5ra22942a] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
It still remains a challenge for the scientific community to obtain high quality barium titanate nanocrystals using high-energy ball mills while avoiding unwanted (carbonate) by-products. The current work addresses this challenge by developing a new solid-state methodology.
Collapse
Affiliation(s)
- Rouholah Ashiri
- Department of Materials Science and Engineering
- Dezful branch
- Islamic Azad University
- Dezful
- Iran
| |
Collapse
|
38
|
Amoli V, Bhat S, Maurya A, Banerjee B, Bhaumik A, Sinha AK. Tailored Synthesis of Porous TiO₂ Nanocubes and Nanoparallelepipeds with Exposed {111} Facets and Mesoscopic Void Space: A Superior Candidate for Efficient Dye-Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2015; 7:26022-26035. [PMID: 26574644 DOI: 10.1021/acsami.5b07954] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Anatase TiO2 nanocubes and nanoparallelepipeds, with highly reactive {111} facets exposed, were developed for the first time through a modified one pot hydrothermal method, through the hydrolysis of tetrabutyltitanate in the presence of oleylamine as the morphology-controlling capping-agent and using ammonia/hydrofluoric acid for stabilizing the {111} faceted surfaces. These nanocubes/nanoparallelepipeds were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and high angle annular dark-field scanning TEM (HAADF-STEM). Accordingly, a possible growth mechanism for the nanostructures is elucidated. The morphology, surface area and the pore size distribution of the TiO2 nanostructures can be tuned simply by altering the HF and ammonia dosage in the precursor solution. More importantly, optimization of the reaction system leads to the assembly of highly crystalline, high surface area, {111} faceted anatase TiO2 nanocubes/nanoparallelepipeds to form uniform mesoscopic void space. We report the development of a novel double layered photoanode for dye sensitized solar cells (DSSCs) made of highly crystalline, self-assembled faceted TiO2 nanocrystals as upper layer and commercial titania nanoparticles paste as under layer. The bilayered DSSC made from TiO2 nanostructures with exposed {111} facets as upper layer shows a much higher power conversion efficiency (9.60%), than DSSCs fabricated with commercial (P25) titania powder (4.67%) or with anatase TiO2 nanostructures having exposed {101} facets (7.59%) as the upper layer. The improved performance in bilayered DSSC made from TiO2 nanostructures with exposed {111} facets as the upper layer is attributed to high dye adsorption and fast electron transport dynamics owing to the unique structural features of the {111} facets in TiO2. Electrochemical impedance spectroscopy (EIS) measurements conducted on the cells supported these conclusions, which showed that the bilayered DSSC made from TiO2 nanostructures with exposed {111} facets as the upper layer possessed lower charge transfer resistance, higher electron recombination resistance, longer electron lifetime and higher collector efficiency characteristics, compared to DSSCs fabricated with commercial (P25) titania powder or with anatase TiO2 nanostructures having exposed {101} facets as the upper layer.
Collapse
Affiliation(s)
- Vipin Amoli
- CSIR-Indian Institute of Petroleum , Dehradun 248005, India
- Department of Material Science, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Shekha Bhat
- CSIR-Indian Institute of Petroleum , Dehradun 248005, India
- Department of Material Science, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Abhayankar Maurya
- CSIR-Indian Institute of Petroleum , Dehradun 248005, India
- Department of Material Science, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Biplab Banerjee
- Department of Material Science, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Asim Bhaumik
- Department of Material Science, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Anil Kumar Sinha
- CSIR-Indian Institute of Petroleum , Dehradun 248005, India
- Department of Material Science, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| |
Collapse
|
39
|
Lee KY, Hwang H, Choi W. Phase Transformations of Cobalt Oxides in CoxOy-ZnO Multipod Nanostructures via Combustion from Thermopower Waves. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:4762-4773. [PMID: 26136292 DOI: 10.1002/smll.201501038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 05/27/2015] [Indexed: 06/04/2023]
Abstract
The study of combustion at the interfaces of materials and chemical fuels has led to developments in diverse fields such as materials chemistry and energy conversion. Recently, it has been suggested that thermopower waves can utilize chemical-thermal-electrical-energy conversion in hybrid structures comprising nanomaterials and combustible fuels to produce enhanced combustion waves with concomitant voltage generation. In this study, this is the first time that the direct phase transformation of Co-doped ZnO via instant combustion waves and its applications to thermopower waves is presented. It is demonstrated that the chemical combustion waves at the surfaces of Co3O4-ZnO multipod nanostructures (deep brown in color) enable direct phase transformations to newly formed CoO-ZnO(1-x) nanoparticles (olive green in color). The oxygen molecules are released from Co3O4-ZnO to CoO-ZnO(1-x) under high-temperature conditions in the reaction front regime in combustion, whereas the CoO-ZnO multipod nanoparticles do not undergo any transformations and thus do not experience any color change. This oxygen-release mechanism is applicable to thermopower waves, enhances the self-propagating combustion velocity, and forms lattice defects that interrupt the charge-carrier movements inside the nanostructures. The chemical transformation and corresponding energy transport observed in this study can contribute to diverse potential applications, including direct-combustion synthesis and energy conversion.
Collapse
Affiliation(s)
- Kang Yeol Lee
- School of Mechanical Engineering, Korea University, Seoul, 136-701, Korea
| | - Hayoung Hwang
- School of Mechanical Engineering, Korea University, Seoul, 136-701, Korea
| | - Wonjoon Choi
- School of Mechanical Engineering, Korea University, Seoul, 136-701, Korea
| |
Collapse
|
40
|
Atomic-scale control of TiO₆ octahedra through solution chemistry towards giant dielectric response. Sci Rep 2014; 4:6582. [PMID: 25301286 PMCID: PMC4192633 DOI: 10.1038/srep06582] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 09/17/2014] [Indexed: 11/08/2022] Open
Abstract
The structures of many important functional oxides contain networks of metal-oxygen polyhedral units i.e.MOn. The correlation between the configurations and connectivities of these MOn to properties is essentially important to be well established to conduct the design, synthesis and application of new MOn-based functional materials. In this paper, we report on an atomic-scale solution-chemistry approach that for the first time enables TiO6 octahedral network control starting from metastable brookite TiO2 through simultaneously tuning pH values and interfering ions (Fe3+, Sc3+, and Sm3+). The relationship between solution chemistry and the resultant configuration/connectivity of TiO6 octahedra in TiO2 and lepidocrocite titanate is mapped out. Apart from differing crystalline phases and morphologies, atomic-scale TiO6 octahedral control also endows numerous defect dipoles for giant dielectric responses. The structural and property evolutions are well interpreted by the associated H+/OH− species in solution and/or defect states associated with Fe3+ occupation within TiO6 octahedra. This work therefore provides fundamental new insights into controlling TiO6 octahedral arrangement essential for atomic-scale structure-property design.
Collapse
|
41
|
Rajh T, Dimitrijevic NM, Bissonnette M, Koritarov T, Konda V. Titanium Dioxide in the Service of the Biomedical Revolution. Chem Rev 2014; 114:10177-216. [DOI: 10.1021/cr500029g] [Citation(s) in RCA: 222] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tijana Rajh
- Center
for Nanoscale Materials, Argonne National Laboratory, 9700 South
Cass Avenue, Argonne, Illinois 60540, United States
| | - Nada M. Dimitrijevic
- Center
for Nanoscale Materials, Argonne National Laboratory, 9700 South
Cass Avenue, Argonne, Illinois 60540, United States
| | - Marc Bissonnette
- Department
of Medicine, The University of Chicago Medicine, 5841 South Maryland Avenue, MC 4076, Chicago, Illinois 60637, United States
| | - Tamara Koritarov
- Center
for Nanoscale Materials, Argonne National Laboratory, 9700 South
Cass Avenue, Argonne, Illinois 60540, United States
- School
of Medicine, Boston University, 72 East Concord Street, Boston, Massachusetts 02118, United States
| | - Vani Konda
- Department
of Medicine, The University of Chicago Medicine, 5841 South Maryland Avenue, MC 4076, Chicago, Illinois 60637, United States
| |
Collapse
|
42
|
Zhang H, Banfield JF. Structural Characteristics and Mechanical and Thermodynamic Properties of Nanocrystalline TiO2. Chem Rev 2014; 114:9613-44. [DOI: 10.1021/cr500072j] [Citation(s) in RCA: 228] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Hengzhong Zhang
- Department
of Earth and Planetary
Science, University of California, Berkeley, California 94720, United States
| | - Jillian F. Banfield
- Department
of Earth and Planetary
Science, University of California, Berkeley, California 94720, United States
| |
Collapse
|
43
|
Liu L, Chen X. Titanium Dioxide Nanomaterials: Self-Structural Modifications. Chem Rev 2014; 114:9890-918. [DOI: 10.1021/cr400624r] [Citation(s) in RCA: 395] [Impact Index Per Article: 39.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lei Liu
- State
Key Laboratory of Luminescence and Applications, Changchun Institute
of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 130033, Changchun, Jilin, People’s Republic of China
| | - Xiaobo Chen
- Department
of Chemistry, University of Missouri—Kansas City, Kansas City, Missouri 64110, United States
| |
Collapse
|
44
|
Affiliation(s)
- Norifusa Satoh
- Environment and Energy Materials Division, National Institute for Materials Science (NIMS)
| |
Collapse
|
45
|
Xia T, Li N, Zhang Y, Kruger MB, Murowchick J, Selloni A, Chen X. Directional heat dissipation across the interface in anatase-rutile nanocomposites. ACS APPLIED MATERIALS & INTERFACES 2013; 5:9883-9890. [PMID: 24090213 DOI: 10.1021/am402983k] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Understanding the structures and properties of interfaces in (nano-)composites helps to reveal their important influence on reactivity and overall performance. TiO2 is a technologically important material, and anatase/rutile TiO2 composites have been shown to display enhanced photocatalytic performance over pure anatase or rutile TiO2. This has been attributed to a synergistic effect between the two phases, but the origin of this effect as well as the structure of the interface has not been established. Using Raman spectroscopy, here we provide evidence of distinct differences in the thermal properties of the anatase and rutile moieties in the composite, with anatase becoming effectively much warmer than the rutile phase under laser irradiation. With the help of first-principles calculations, we analyze the atomic structure and unique electronic properties of the composite and infer possible reasons for the directional heat dissipation across the interface.
Collapse
Affiliation(s)
- Ting Xia
- Department of Chemistry, ⊥Department of Physics and Astronomy, and ||Department of Geosciences, University of Missouri-Kansas City , Kansas City, Missouri 64110, United States
| | | | | | | | | | | | | |
Collapse
|