1
|
Yim CM, Allan M, Pang CL, Thornton G. Scanning Tunneling Microscopy Visualization of Polaron Charge Trapping by Hydroxyls on TiO 2(110). THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2024; 128:14100-14106. [PMID: 39193256 PMCID: PMC11345827 DOI: 10.1021/acs.jpcc.4c03751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2024] [Revised: 07/28/2024] [Accepted: 07/30/2024] [Indexed: 08/29/2024]
Abstract
Using scanning tunneling microscopy (STM), we investigate the spatial distribution of the bridging hydroxyl (OHb) bound excess electrons on the rutile TiO2(110) surface and its temperature dependence. By performing simultaneously recorded empty and filled state imaging on single OHbs at different temperatures in STM, we determine that the spatial distribution of the OHb bound excess electrons retains a symmetric four-lobe structure around the OHb at both 78 and 7 K. This indicates that OHbs are much weaker charge traps compared to bridging O vacancies (Ob-vac). In addition, by sequentially removing the capping H of each OHb using voltage pulses, we find that the annihilation of each OHb is accompanied by the disappearance of some lobes in the filled state STM, thus verifying the direct correlation between OHbs and their excess electrons.
Collapse
Affiliation(s)
- Chi-Ming Yim
- Department
of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
- Tsung
Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, 1 Lisuo Road, Shanghai 201210, China
| | - Michael Allan
- Department
of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
| | - Chi Lun Pang
- Department
of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
| | - Geoff Thornton
- Department
of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
| |
Collapse
|
2
|
Pada Sarker H, Abild-Pedersen F, Bajdich M. Prediction of Feasibility of Polaronic OER on (110) Surface of Rutile TiO 2. Chemphyschem 2024; 25:e202400060. [PMID: 38427793 DOI: 10.1002/cphc.202400060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 02/23/2024] [Accepted: 02/28/2024] [Indexed: 03/03/2024]
Abstract
The polaronic effects at the atomic level hold paramount significance for advancing the efficacy of transition metal oxides in applications pertinent to renewable energy. The lattice-distortion mediated localization of photoexcited carriers in the form of polarons plays a pivotal role in the photocatalysis. This investigation focuses on rutile TiO2, an important material extensively explored for solar energy conversion in artificial photosynthesis, specifically targeting the generation of green H2 through photoelectrochemical (PEC) H2O splitting. By employing Hubbard-U corrected and hybrid density functional theory (DFT) methods, we systematically probe the polaronic effects in the catalysis of oxygen evolution reaction (OER) on the (110) surface of rutile TiO2. Theoretical understanding of polarons within the surface, coupled with simulations of OER at distinct titanium (Ti) and oxygen (O) active sites, reveals diverse polaron formation energies within the lattice sites with strong preference for bulk and surface bridge (Ob) oxygen sites. Moreover, we provide the evidence for the facilitative role of polarons in OER. We find that hole polarons situated at the equatorial oxygen sites near the Ti-active site, along with bridge site hole polarons distal from the Ob active site yield a small reduction in OER overpotential by ~0.06 eV and ~0.12 eV, respectively. However, subsurface, equatorial, and bridge site hole polarons significantly reduce the Ti-active site OER overpotential by ~0.4 eV through the peroxo-type oxygen pathway. We also observe that the presence of hole polarons stabilizes the *OH, *O, and *OOH intermediate species compared to the scenario without hole polarons. Overall, this study provides a detailed mechanistic insight into polaron-mediated OER, offering a promising avenue for improving the catalytic activity of transition metal oxide-based photocatalysts catering to renewable energy requisites.
Collapse
Affiliation(s)
- Hori Pada Sarker
- Liquid Sunlight Alliance (LiSA), California Institute of Technology, Pasadena, CA, 91125, USA
- Department of Chemical Engineering, Stanford University, 43 Via Ortega, Stanford, CA, 94305, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Frank Abild-Pedersen
- Liquid Sunlight Alliance (LiSA), California Institute of Technology, Pasadena, CA, 91125, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Michal Bajdich
- Liquid Sunlight Alliance (LiSA), California Institute of Technology, Pasadena, CA, 91125, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| |
Collapse
|
3
|
Ribić V, Jordan V, Drev S, Kovač J, Dražić G, Rečnik A. Mnemonic Rutile-Rutile Interfaces Triggering Spontaneous Dissociation of Water. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2308027. [PMID: 37935053 DOI: 10.1002/adma.202308027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/11/2023] [Indexed: 11/09/2023]
Abstract
Water interaction with mineral surfaces is a complex living system decisive for any photocatalytic process. Resolving the atomistic structure of mineral-water interfaces is thus crucial for understanding these processes. Fibrous rutile TiO2 , grown hydrothermally on twinned rutile seeds under acidic conditions, is studied in terms of interface translation, atomic structure, and surface chemistry in the presence of water, by means of advanced microscopy and spectroscopy methods combined with structure modeling and density functional theory calculations. It is shown that fibers while staying in stable separation during their growth, adopt a special crystallographic registry that is controlled by repulsion forces between fully hydroxylated and protonated (110) surfaces. During relaxation, a turbulent proton transfer and cracking of O─H bonds is observed, generating a strong acidic character via proton jump from bridge ─OHb to terminal ─OHt groups, and spontaneous dissociation of interfacial water via a transient protonation of the ─OHt groups. It is shown, that this specific interface structure can be implemented to induce acidic response in an initially neutral medium when re-immersed. This is thought to be the first demonstration of quantum-confined mineral-water interface, capable of memorizing its past and conveying its structurally encoded properties into a new environment.
Collapse
Affiliation(s)
- Vesna Ribić
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova cesta 39, Ljubljana, SI-1000, Slovenia
| | - Vanja Jordan
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova cesta 39, Ljubljana, SI-1000, Slovenia
| | - Sandra Drev
- Center for Electron Microscopy and Microanalysis, Jožef Stefan Institute, Jamova cesta 39, Ljubljana, SI-1000, Slovenia
| | - Janez Kovač
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Jamova cesta 39, Ljubljana, SI-1000, Slovenia
| | - Goran Dražić
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, Ljubljana, SI-1000, Slovenia
| | - Aleksander Rečnik
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova cesta 39, Ljubljana, SI-1000, Slovenia
| |
Collapse
|
4
|
Nematov DD, Burhonzoda AS, Kholmurodov KT, Lyubchyk AI, Lyubchyk SI. A Detailed Comparative Analysis of the Structural Stability and Electron-Phonon Properties of ZrO 2: Mechanisms of Water Adsorption on t-ZrO 2 (101) and t-YSZ (101) Surfaces. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2657. [PMID: 37836297 PMCID: PMC10574635 DOI: 10.3390/nano13192657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 09/19/2023] [Accepted: 09/20/2023] [Indexed: 10/15/2023]
Abstract
In this study, we considered the structural stability, electronic properties, and phonon dispersion of the cubic (c-ZrO2), tetragonal (t-ZrO2), and monoclinic (m-ZrO2) phases of ZrO2. We found that the monoclinic phase of zirconium dioxide is the most stable among the three phases in terms of total energy, lowest enthalpy, highest entropy, and other thermodynamic properties. The smallest negative modes were found for m-ZrO2. Our analysis of the electronic properties showed that during the m-t phase transformation of ZrO2, the Fermi level first shifts by 0.125 eV toward higher energies, and then decreases by 0.08 eV in the t-c cross-section. The band gaps for c-ZrO2, t-ZrO2, and m-ZrO2 are 5.140 eV, 5.898 eV, and 5.288 eV, respectively. Calculations based on the analysis of the influence of doping 3.23, 6.67, 10.35, and 16.15 mol. %Y2O3 onto the m-ZrO2 structure showed that the enthalpy of m-YSZ decreases linearly, which accompanies the further stabilization of monoclinic ZrO2 and an increase in its defectiveness. A doping-induced and concentration-dependent phase transition in ZrO2 under the influence of Y2O3 was discovered, due to which the position of the Fermi level changes and the energy gap decreases. It has been established that the main contribution to the formation of the conduction band is made by the p-states of electrons, not only for pure systems, but also those doped with Y2O3. The t-ZrO2 (101) and t-YSZ (101) surface models were selected as optimal surfaces for water adsorption based on a comparison of their surface energies. An analysis of the mechanism of water adsorption on the surface of t-ZrO2 (101) and t-YSZ (101) showed that H2O on unstabilized t-ZrO2 (101) is adsorbed dissociatively with an energy of -1.22 eV, as well as by the method of molecular chemisorption with an energy of -0.69 eV and the formation of a hydrogen bond with a bond length of 1.01 Å. In the case of t-YSZ (101), water is molecularly adsorbed onto the surface with an energy of -1.84 eV. Dissociative adsorption of water occurs at an energy of -1.23 eV, near the yttrium atom. The results show that ab initio approaches are able to describe the mechanism of doping-induced phase transitions in (ZrO2+Y2O3)-like systems, based on which it can be assumed that DFT calculations can also flawlessly evaluate other physical and chemical properties of YSZ, which have not yet been studied quantum chemical research. The obtained results complement the database of research works carried out in the field of the application of biocompatible zirconium dioxide crystals and ceramics in green energy generation, and can be used in designing humidity-to-electricity converters and in creating solid oxide fuel cells based on ZrO2.
Collapse
Affiliation(s)
- Dilshod D. Nematov
- Osimi Tajik Technical University, Dushanbe 734042, Tajikistan
- S.U. Umarov Physical-Technical Institute of NAST, Dushanbe 734042, Tajikistan
| | - Amondulloi S. Burhonzoda
- Osimi Tajik Technical University, Dushanbe 734042, Tajikistan
- S.U. Umarov Physical-Technical Institute of NAST, Dushanbe 734042, Tajikistan
| | - Kholmirzo T. Kholmurodov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Dubna State University, 141980 Dubna, Russia
| | | | | |
Collapse
|
5
|
Catalytic Oxidation of Propane and Carbon Monoxide by Pd Nanoparticles on Mn/TiO2 Catalysts. Catal Letters 2023. [DOI: 10.1007/s10562-023-04285-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
AbstractThe present work shows experimental results on the catalytic oxidation of C3H8 and CO by Pd nanoparticles supported on MnOx/TiO2 synthesized by the sol–gel method. The results show a strong interaction between Pd and MnOx/TiO2; likewise, the annealing temperature of the TiO2 support modified the catalytic properties of the Pd–MnOx/TiO2 catalyst. In this line, the catalysts with 1 and 2 wt% of Pd loading supported on MnOx/TiO2 showed outstanding catalytic activity oxidizing C3H8 and CO within two temperature intervals: 200–400 °C and 25–200 °C, respectively. The Pd–MnOx/TiO2 catalyst also displayed very high stability during long-term tests and the addition of Pd nanoparticles reduced greatly the oxidation temperature of MnOx/TiO2. The outcomes revealed that the Pd–Mn interaction promoted the formation of new Pd0/Pd2+ active sites as well as the formation of oxygen vacancies and reduced Ti4+ to Ti3+ species, which led to the improvement of the Mn3+ and Mn4+ redox features, thus boosting the catalytic oxidation capacity of the Pd–MnOx/TiO2 catalyst.
Graphical Abstract
Collapse
|
6
|
Tong X, Price SP, Robins JC, Ridge C, Kim HY, Kemper P, Metiu H, Bowers MT, Buratto SK. VO Cluster-Stabilized H 2O Adsorption on a TiO 2 (110) Surface at Room Temperature. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:17975-17982. [PMID: 36330165 PMCID: PMC9619923 DOI: 10.1021/acs.jpcc.2c06202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/04/2022] [Indexed: 06/16/2023]
Abstract
We probe the adsorption of molecular H2O on a TiO2 (110)-(1 × 1) surface decorated with isolated VO clusters using ultrahigh-vacuum scanning tunneling microscopy (UHV-STM) and temperature-programmed desorption (TPD). Our STM images show that preadsorbed VO clusters on the TiO2 (110)-(1 × 1) surface induce the adsorption of H2O molecules at room temperature (RT). The adsorbed H2O molecules form strings of beads of H2O dimers bound to the 5-fold coordinated Ti atom (5c-Ti) rows and are anchored by VO. This RT adsorption is completely reversible and is unique to the VO-decorated TiO2 surface. TPD spectra reveal two new desorption states for VO stabilized H2O at 395 and 445 K, which is in sharp contrast to the desorption of water due to recombination of hydroxyl groups at 490 K from clean TiO2(110)-(1 × 1) surfaces. Density functional theory (DFT) calculations show that the binding energy of molecular H2O to the VO clusters on the TiO2 (110)-(1 × 1) surface is higher than binding to the bare surface by 0.42 eV, and the resulting H2O-VO-TiO2 (110) complex provides the anchor point for adsorption of the string of beads of H2O dimers.
Collapse
Affiliation(s)
- Xiao Tong
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| | - Scott P. Price
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| | - Jeremy C. Robins
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| | - Claron Ridge
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| | - Hyun You Kim
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| | - Paul Kemper
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| | - Horia Metiu
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| | - Michael T. Bowers
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| | - Steven K. Buratto
- Department of Chemistry and
Biochemistry, University of California,
Santa Barbara, Santa
Barbara, California 93106-9510, United States
| |
Collapse
|
7
|
Tesvara C, Walenta C, Sautet P. Oxidative decomposition of dimethyl methylphosphonate on rutile TiO 2(110): the role of oxygen vacancies. Phys Chem Chem Phys 2022; 24:23402-23419. [PMID: 36128829 DOI: 10.1039/d2cp02246j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The decomposition of dimethyl methylphosphonate (DMMP, (CH3O)2P(O)(CH3)), a simulant to the toxic nerve agent Sarin, on the rutile TiO2(110) surface has been studied with temperature programmed desorption (TPD) and density functional theory (DFT) calculations. The reactivity of the TiO2(110) surface for DMMP decomposition is shown to be low, with mainly molecular desorption and only a small fraction of methanol and formaldehyde decomposition products seen from TPD at around 650 K. In addition, this amount of products is similar to the number of O vacancies on the surface. DFT calculations show that O vacancies are key for P-OCH3 bond cleavage of DMMP, lowering the barrier by 0.7 eV and enabling the reactive process to occur at around 600 K. This is explained by the closer position of DMMP with respect to the surface in the presence of O vacancies. Calculations show that the produced methoxy groups can transform into gas phase formaldehyde and methanol at the considered temperature (600 K), in agreement with experiments. O-C bond cleavage of DMMP is also a viable pathway at such a high temperature (600 K) for DMMP decomposition on r-TiO2, even in the absence of O vacancies, but the formation of a gas phase product is energetically unfavorable. O vacancies hence are the active sites for decomposition of DMMP into gas phase products on r-TiO2(110).
Collapse
Affiliation(s)
- Celine Tesvara
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, CA 90095, USA.
| | - Constantin Walenta
- Department of Chemistry & Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Philippe Sautet
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, CA 90095, USA. .,Chemistry and Biochemistry Department, University of California, Los Angeles, CA 90095, USA
| |
Collapse
|
8
|
Zhang L, Bao Q, Zhang B, Zhang Y, Wan S, Wang S, Lin J, Xiong H, Mei D, Wang Y. Distinct Role of Surface Hydroxyls in Single-Atom Pt 1/CeO 2 Catalyst for Room-Temperature Formaldehyde Oxidation: Acid-Base Versus Redox. JACS AU 2022; 2:1651-1660. [PMID: 35911462 PMCID: PMC9327081 DOI: 10.1021/jacsau.2c00215] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The development of highly efficient catalysts for room-temperature formaldehyde (HCHO) oxidation is of great interest for indoor air purification. In this work, it was found that the single-atom Pt1/CeO2 catalyst exhibits a remarkable activity with complete removal of HCHO even at 288 K. Combining density functional theory calculations and in situ DRIFTS experiments, it was revealed that the active OlatticeH site generated on CeO2 in the vicinity of Pt2+ via steam treatment plays a key role in the oxidation of HCHO to formate and its further oxidation to CO2. Such involvement of hydroxyls is fundamentally different from that of cofeeding water which dissociates on metal oxide and catalyzes the acid-base-related chemistry. This study provides an important implication for the design and synthesis of supported Pt catalysts with atom efficiency for a very important practical application-room-temperature HCHO oxidation.
Collapse
Affiliation(s)
- Lina Zhang
- State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
- National
Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Qianqian Bao
- State
Key Laboratory of Separation Membranes and Membrane Processes, School
of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China
| | - Bangjie Zhang
- State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
- National
Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yuanbao Zhang
- State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
- National
Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Shaolong Wan
- State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
- National
Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Shuai Wang
- State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
- National
Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jingdong Lin
- State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
- National
Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Haifeng Xiong
- State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
- National
Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Donghai Mei
- State
Key Laboratory of Separation Membranes and Membrane Processes, School
of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China
| | - Yong Wang
- Voiland
School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99164, United States
| |
Collapse
|
9
|
Williams OBJ, Katsiev K, Baek B, Harrison G, Thornton G, Idriss H. Direct Visualization of a Gold Nanoparticle Electron Trapping Effect. J Am Chem Soc 2022; 144:1034-1044. [PMID: 34985273 DOI: 10.1021/jacs.1c12197] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A new atomic-scale anisotropy in the photoreaction of surface carboxylates on rutile TiO2(110) induced by gold clusters is found. STM and DFT+U are used to study this phenomenon by monitoring the photoreaction of a prototype hole-scavenger molecule, benzoic acid, over stoichiometric (s) s-TiO2, Au9/s-TiO2, and reduced (r) Au9/r-TiO2. STM results show that benzoic acid adsorption displaces a large fraction of Au clusters from the terraces toward their edges. DFT calculations explain that Au9 clusters on stoichiometric TiO2 are distorted by benzoic acid adsorption. The influence of sub-monolayers of Au on the UV/visible photoreaction of benzoic acid was explored at room temperature, with adsorbate depletion taken as a measure of activity. The empty sites, observed upon photoexcitation, occurred in elongated chains (2 to 6 molecules long) in the [11̅0] and [001] directions. A roughly 3-fold higher depletion rate is observed in the [001] direction. This is linked to the anisotropic conduction of excited electrons along [001], with subsequent trapping by Au clusters leaving a higher concentration of holes and thus an increased decomposition rate. To our knowledge this is the first time that atomic-scale directionality of a chemical reaction is reported upon photoexcitation of the semiconductor.
Collapse
Affiliation(s)
- Oscar Bentley Jerdmyr Williams
- Department of Chemistry and London Centre for Nanotechnology (LCN), University College London (UCL), WC1H 0AH, London, U.K
| | - Khabiboulakh Katsiev
- Surface Science and Advanced Characterisation, SABIC-CRD at King Abdullah University for Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
| | - Byeongjin Baek
- SABIC Global Corporate Research, Sugar Land, Texas 77478, United States
| | - George Harrison
- KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), King Abdullah University for Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
| | - Geoff Thornton
- Department of Chemistry and London Centre for Nanotechnology (LCN), University College London (UCL), WC1H 0AH, London, U.K
| | - Hicham Idriss
- Department of Chemistry and London Centre for Nanotechnology (LCN), University College London (UCL), WC1H 0AH, London, U.K.,Surface Science and Advanced Characterisation, SABIC-CRD at King Abdullah University for Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
| |
Collapse
|
10
|
Martin R, Kim M, Asthagiri A, Weaver JF. Alkane Activation and Oxidation on Late-Transition-Metal Oxides: Challenges and Opportunities. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00612] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Rachel Martin
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Minkyu Kim
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea
| | - Aravind Asthagiri
- William G. Lowrie Department of Chemical & Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - Jason F. Weaver
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| |
Collapse
|
11
|
Single hydrogen atom manipulation for reversible deprotonation of water on a rutile TiO 2 (110) surface. Commun Chem 2021; 4:5. [PMID: 36697495 PMCID: PMC9814442 DOI: 10.1038/s42004-020-00444-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 12/07/2020] [Indexed: 01/28/2023] Open
Abstract
The discovery of hydrogen atoms on the TiO2 surface is crucial for many practical applications, including photocatalytic water splitting. Electronically activating interfacial hydrogen atoms on the TiO2 surface is a common way to control their reactivity. Modulating the potential landscape is another way, but dedicated studies for such an activation are limited. Here we show the single hydrogen atom manipulation, and on-surface facilitated water deprotonation process on a rutile TiO2 (110) surface using low temperature atomic force microscopy and Kelvin probe force spectroscopy. The configuration of the hydrogen atom is manipulated on this surface step by step using the local field. Furthermore, we quantify the force needed to relocate the hydrogen atom on this surface using force spectroscopy and density functional theory. Reliable control of hydrogen atoms provides a new mechanistic insight of the water molecules on a metal oxide surface.
Collapse
|
12
|
Groh S, Saßnick H, Ruiz VG, Dzubiella J. How the hydroxylation state of the (110)-rutile TiO 2 surface governs its electric double layer properties. Phys Chem Chem Phys 2021; 23:14770-14782. [PMID: 34196342 DOI: 10.1039/d1cp02043a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The hydroxylation state of an oxide surface is a central property of its solid/liquid interface and its corresponding electrical double layer. This study integrated both a reactive force field (ReaxFF) and a non-reactive potential into a hierarchical framework within molecular dynamics (MD) simulations to reveal how the hydroxylation state of the (110)-rutile TiO2 surface affects the electrical double layer properties. The simulation results obtained in the ReaxFF framework have shown that, while water dissociation occurs only at the under-coordinated Ti5c sites on the pristine TiO2 surface, the presence of point defects on the surface facilitates water dissociation at the oxygen vacancy sites, leading to two protonated oxygen bridge atoms for each vacancy site. As a consequence of enhanced water dissociation at the vacancy sites, water dissociation is quenched at the under-coordinated Ti5c sites resulting in two competitive hydroxylation mechanisms on the (110)-TiO2 surface. Using non-reactive MD simulations with hydroxylation states derived from the ReaxFF analysis, we demonstrate that water dissociation at the vacancy sites is a central mechanism governing the structuring of water near the interface. While the structuring of water near the interface is the main contribution to the electric field, water dissociation at the vacancy site enhances the adsorption of the electrolyte ions at the interface. The adsorbed ions lead to an increase of the effective surface charge as well as surface (zeta) potentials which are in the range of experimental observations. Our work provides a hierarchical multiscale simulation approach, covering a series of results with in-depth discussion for atomic/molecular level understanding of water dissociation and its effect on electric double layer properties of TiO2 to advance water splitting.
Collapse
Affiliation(s)
- Sebastien Groh
- Applied Theoretical Physics-Computational Physics, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany.
| | - Holger Saßnick
- Research Group for Simulations of Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| | - Victor G Ruiz
- Research Group for Simulations of Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| | - Joachim Dzubiella
- Applied Theoretical Physics-Computational Physics, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany. and Research Group for Simulations of Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| |
Collapse
|
13
|
Deskins NA, Kimmel GA, Petrik NG. Observation of Molecular Hydrogen Produced from Bridging Hydroxyls on Anatase TiO 2(101). J Phys Chem Lett 2020; 11:9289-9297. [PMID: 33090788 DOI: 10.1021/acs.jpclett.0c02735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Anatase TiO2 is used extensively in a wide range of catalytic and photocatalytic processes and is a promising catalyst for hydrogen production. Here, we show that molecular hydrogen was produced from bridging hydroxyls (HOb) on the (101) surface of single-crystal anatase (TiO2(101)). This stands in contrast to rutile TiO2(110), where HOb pairs react to form H2O. Electron bombardment at 30 K produced bridging oxygen vacancies in the surface. Deuterated bridging hydroxyls (DOb) were subsequently formed via dissociation of adsorbed D2O and confirmed by infrared reflection-absorption spectroscopy. During temperature-programmed desorption (TPD) spectroscopy, D2 desorption was observed at 520 K. Density functional theory calculations show that both H2 and H2O production from HOb are endothermic at 0 K on TiO2(101), but H2 (H2O) desorption is entropically driven above 230 K (800 K). The calculated activation barrier for H2 desorption is 1.40 eV, which is similar to the desorption energy obtained from analysis of the D2 TPD spectra. The H2 desorption likely proceeds in two steps: H atom diffusion on the surface and then recombination.
Collapse
Affiliation(s)
- N Aaron Deskins
- Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, United States
| | - Greg A Kimmel
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Nikolay G Petrik
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| |
Collapse
|
14
|
Li Y, Wang C, Zhang C, He H. Formaldehyde Oxidation on Pd/TiO2 Catalysts at Room Temperature: The Effects of Surface Oxygen Vacancies. Top Catal 2020. [DOI: 10.1007/s11244-020-01349-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
|
15
|
Chen X, He G, Li Y, Chen M, Qin X, Zhang C, He H. Identification of a Facile Pathway for Dioxymethylene Conversion to Formate Catalyzed by Surface Hydroxyl on TiO2-Based Catalyst. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01901] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xueyan Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guangzhi He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yaobin Li
- University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Min Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaoxiao Qin
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Changbin Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| |
Collapse
|
16
|
Jiang D, Liu Z, Fu L, Yang H. Interfacial Chemical-Bond-Modulated Charge Transfer of Heterostructures for Improving Photocatalytic Performance. ACS APPLIED MATERIALS & INTERFACES 2020; 12:9872-9880. [PMID: 31994377 DOI: 10.1021/acsami.9b17183] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Interface engineering of heterostructured photocatalysts plays a very important role in the transfer and separation process of interfacial charge carriers, but how to regulate the transfer and separation of photogenerated charge carriers still is a huge challenge at the nanometric interface of heterostructures (HCs). Herein, we demonstrate that interfacial chemical bonds can effectively modulate photogenerated charge transfer in nanoclay-based HCs constructed by natural Kaolinite (Kaol) nanosheets and P25-TiO2. Experimental results and density functional theory (DFT) calculations confirm that stable Al-O-Ti bonds form at the interfaces by interactions of the Al-OH groups of Kaol and (101) surfaces of anatase TiO2. The Al-O-Ti bond strengthens the energy band bending of the space charge region near the interfacial bond and thus provides a fast transfer channel for interfacial photogenerated charge, resulting in the boosted charge transfer and separation ability of Kaol/P25 HCs. The findings reported here provide a deeper insight into modulating interfacial charge transfer by chemical bonds and shed new light on interface engineering of efficient heterostructured photocatalysts for environmental applications.
Collapse
Affiliation(s)
- Denghui Jiang
- Centre for Mineral Materials, School of Minerals Processing and Bioengineering , Central South University , Changsha 410083 , China
| | - Ziran Liu
- Department of Physics, Key Lab for Low-Dimensional Structures and Quantum Manipulation (Ministry of Education) , Hunan Normal University , Changsha 410081 , China
| | - Liangjie Fu
- Centre for Mineral Materials, School of Minerals Processing and Bioengineering , Central South University , Changsha 410083 , China
- Hunan International Joint Lab of Mineral Materials , Central South University , Changsha 410083 , China
| | - Huaming Yang
- Centre for Mineral Materials, School of Minerals Processing and Bioengineering , Central South University , Changsha 410083 , China
- Hunan International Joint Lab of Mineral Materials , Central South University , Changsha 410083 , China
- Key Lab of Clay Mineral Functional Materials in China Building Materials Industry , Central South University , Changsha 410083 , China
| |
Collapse
|
17
|
Low-cost visible-light photosynthesis of water and adsorbed carbon dioxide into long-chain hydrocarbons. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2019.136985] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
18
|
Guo Q, Zhou C, Ma Z, Yang X. Fundamentals of TiO 2 Photocatalysis: Concepts, Mechanisms, and Challenges. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1901997. [PMID: 31423680 DOI: 10.1002/adma.201901997] [Citation(s) in RCA: 444] [Impact Index Per Article: 88.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 07/23/2019] [Indexed: 05/27/2023]
Abstract
Photocatalysis has been widely applied in various areas, such as solar cells, water splitting, and pollutant degradation. Therefore, the photochemical mechanisms and basic principles of photocatalysis, especially TiO2 photocatalysis, have been extensively investigated by various surface science methods in the last decade, aiming to provide important information for TiO2 photocatalysis under real environmental conditions. Recent progress that provides fundamental insights into TiO2 photocatalysis at a molecular level is highlighted. Insights into the structures of TiO2 and the basic principles of TiO2 photocatalysis are discussed first, which provides the basic concepts of TiO2 photocatalysis. Following this, details of the photochemistry of three important molecules (oxygen, water, methanol) on the model TiO2 surfaces are presented, in an attempt to unravel the relationship between charge/energy transfer and bond breaking/forming in TiO2 photocatalysis. Lastly, challenges and opportunities of the mechanistic studies of TiO2 photocatalysis at the molecular level are discussed briefly, as well as possible photocatalysis models.
Collapse
Affiliation(s)
- Qing Guo
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
- Department of Chemistry, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen, 518055, China
| | - Chuanyao Zhou
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
| | - Zhibo Ma
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
| | - Xueming Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
- Department of Chemistry, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen, 518055, China
| |
Collapse
|
19
|
Walenta CA, Tschurl M, Heiz U. Introducing catalysis in photocatalysis: What can be understood from surface science studies of alcohol photoreforming on TiO 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:473002. [PMID: 31342942 DOI: 10.1088/1361-648x/ab351a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Mechanisms in heterogeneous photocatalysis have traditionally been interpreted by the band-structure model and analogously to electrochemistry. This has led to the establishment of 'band-engineering' as a leading principle for the discovery of more efficient photocatalysts. In such a picture, mainly thermodynamic aspects are taken into account, while kinetics are often ignored. This holds in particular for chemical kinetics, which are, other than those for charge carrier dynamics, often not at all considered for the interpretation of the catalysts' photocatalytic performance. However, while being usually neglected in photocatalyis, they are a traditional and powerful tool in thermal catalysis and are still applied with great success in this field. While surface science studies made substantial contributes to thermal catalysis, analogous studies in heterogeneous photocatalysis still play only a minor role. In this review, the authors show that the photo-physics of defined materials in well-defined environments can be correlated with photochemical events on a surface, highlighting the importance of well-characterized semiconductors for the interpretation of mechanisms in heterogeneous photochemistry. The work focuses on contributions from surface science, which were obtained for the model system of a titania single crystal and alcohol photo-reforming. It is demonstrated that only surface science studies have so far enabled the elucidation of molecularly precise reaction mechanisms, the determination of reaction intermediates and assignment of reactive sites. As the identification of these properties remain major prerequisites for a breakthrough in photocatalysis research, the work also discusses the implications of the findings for applied systems. In general, the results from surface science demonstrate that photocatalytic systems shall also be approached by a perspective originating from heterogeneous catalysis rather than solely from an electrochemical point of view.
Collapse
|
20
|
Ganyecz Á, Mezei PD, Kállay M. Oxygen reduction reaction on TiO2 rutile (1 1 0) surface in the presence of bridging hydroxyl groups. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.112607] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
21
|
Wang L, Xu G, Ma J, Yu Y, Ma Q, Liu K, Zhang C, He H. Nanodispersed Mn 3O 4/γ-Al 2O 3 for NO 2 Elimination at Room Temperature. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:10855-10862. [PMID: 31418541 DOI: 10.1021/acs.est.9b00941] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Adsorption is an efficient method for atmospheric NOx abatement under ambient conditions; however, traditional adsorbents suffer from limited adsorption capacity and byproduct formation. Developing a low-cost material with high capacity for atmospheric NO2 elimination remains a challenge. Here, we synthesized a nanodispersed Mn3O4/γ-Al2O3 (Mn/Al) material that exhibits excellent ability to remove NO2. The 10 wt % Mn/Al sample showed the highest removal capacity, with 247.6 mgNO2/gMn/Al, which is superior to that of activated carbon (42.6 mgNO2/g). There were no byproducts produced when Mn/Al was tested with ppb-level NO2. The NO2 abatement mechanism with Mn/Al is different from physisorption or chemisorption. NO2 removal is mainly a catalytic process in air, during which surface hydroxyls and lattice oxygen are involved in the oxidation of NO2 to nitrate. In contrast, a chemical reaction between Mn3+ and NO2 is dominant in N2, where Mn3+ is converted into Mn4+ and NO2 is reduced to nitrite. Washing with deionized water is an effective and convenient method for the regeneration of saturated Mn/Al, and an 86% adsorption capacity was recovered after one washing. The results suggest that this low-cost Mn/Al material with easy preparation and regeneration is a promising candidate material for atmospheric NO2 elimination.
Collapse
Affiliation(s)
- Lian Wang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Guangyan Xu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
| | - Jinzhu Ma
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Yunbo Yu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Qingxin Ma
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Kuo Liu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
| | - Changbin Zhang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Hong He
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| |
Collapse
|
22
|
Doudin N, Yuk SF, Marcinkowski MD, Nguyen MT, Liu JC, Wang Y, Novotny Z, Kay BD, Li J, Glezakou VA, Parkinson G, Rousseau R, Dohnálek Z. Understanding Heterolytic H2 Cleavage and Water-Assisted Hydrogen Spillover on Fe3O4(001)-Supported Single Palladium Atoms. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01425] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Nassar Doudin
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Simuck F. Yuk
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Matthew D. Marcinkowski
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Manh-Thuong Nguyen
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Jin-Cheng Liu
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yang Wang
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Zbynek Novotny
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Bruce D. Kay
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Jun Li
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Vassiliki-Alexandra Glezakou
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Gareth Parkinson
- Institute of Applied Physics, Vienna University of Technology, Vienna 1040, Austria
| | - Roger Rousseau
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Zdenek Dohnálek
- Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99163, United States
| |
Collapse
|
23
|
González D, Heras-Domingo J, Pantaleone S, Rimola A, Rodríguez-Santiago L, Solans-Monfort X, Sodupe M. Water Adsorption on MO 2 (M = Ti, Ru, and Ir) Surfaces. Importance of Octahedral Distortion and Cooperative Effects. ACS OMEGA 2019; 4:2989-2999. [PMID: 31459524 PMCID: PMC6649029 DOI: 10.1021/acsomega.8b03350] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 01/25/2019] [Indexed: 06/10/2023]
Abstract
Understanding metal oxide MO2 (M = Ti, Ru, and Ir)-water interfaces is essential to assess the catalytic behavior of these materials. The present study analyzes the H2O-MO2 interactions at the most abundant (110) and (011) surfaces, at two different water coverages: isolated water molecules and full monolayer, by means of Perdew-Burke-Ernzerhof-D2 static calculations and ab initio molecular dynamics (AIMD) simulations. Results indicate that adsorption preferably occurs in its molecular form on (110)-TiO2 and in its dissociative form on (110)-RuO2 and (110)-IrO2. The opposite trend is observed at the (011) facet. This different behavior is related to the kind of octahedral distortion observed in the bulk of these materials (tetragonal elongation for TiO2 and tetragonal compression for RuO2 and IrO2) and to the different nature of the vacant sites created, axial on (110) and equatorial on (011). For the monolayer, additional effects such as cooperative H-bond interactions and cooperative adsorption come into play in determining the degree of deprotonation. For TiO2, AIMD indicates that the water monolayer is fully undissociated at both (110) and (011) surfaces, whereas for RuO2, water monolayer exhibits a 50% dissociation, the formation of H3O2 - motifs being essential. Finally, on (110)-IrO2, the main monolayer configuration is the fully dissociated one, whereas on (011)-IrO2, it exhibits a degree of dissociation that ranges between 50 and 75%. Overall, the present study shows that the degree of water dissociation results from a delicate balance between the H2O-MO2 intrinsic interaction and cooperative hydrogen bonding and adsorption effects.
Collapse
|
24
|
Lan Y, Xie Y, Chen J, Hu Z, Cui D. Selective photocatalytic CO2 reduction on copper–titanium dioxide: a study of the relationship between CO production and H2 suppression. Chem Commun (Camb) 2019; 55:8068-8071. [DOI: 10.1039/c9cc02891a] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High selectivity of CO2 reduction and suppression of H2 evolution on a Cu/TiO2 photocatalyst.
Collapse
Affiliation(s)
- Yangchun Lan
- Department of Electrical and Electronic Engineering
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - Yongzhi Xie
- Department of Electrical and Electronic Engineering
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - Jiaxi Chen
- Department of Electrical and Electronic Engineering
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - Zhuofeng Hu
- School of Environmental Science and Engineering
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Dehu Cui
- Department of Electrical and Electronic Engineering
- Southern University of Science and Technology
- Shenzhen 518055
- China
- School of Microelectronics
| |
Collapse
|
25
|
Walenta CA, Kollmannsberger SL, Courtois C, Pereira RN, Stutzmann M, Tschurl M, Heiz U. Why co-catalyst-loaded rutile facilitates photocatalytic hydrogen evolution. Phys Chem Chem Phys 2019; 21:1491-1496. [DOI: 10.1039/c8cp05513k] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photocatalytic H2 evolution on co-catalyst loaded titania is interpreted by a new mechanism, in which the co-catalyst acts as a recombination center for hydrogen and not as a reduction site of a photoreaction.
Collapse
Affiliation(s)
- Constantin A. Walenta
- Chair of Physical Chemistry
- Department of Chemistry & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
| | - Sebastian L. Kollmannsberger
- Chair of Physical Chemistry
- Department of Chemistry & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
| | - Carla Courtois
- Chair of Physical Chemistry
- Department of Chemistry & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
| | - Rui N. Pereira
- Walter Schottky Institute and Physics Department
- Technische Universität München
- 85748 Garching
- Germany
| | - Martin Stutzmann
- Nanosystems Initiative Munich
- 80799 München
- Germany
- Walter Schottky Institute and Physics Department
- Technische Universität München
| | - Martin Tschurl
- Chair of Physical Chemistry
- Department of Chemistry & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
| | - Ueli Heiz
- Chair of Physical Chemistry
- Department of Chemistry & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
| |
Collapse
|
26
|
Wen HF, Miyazaki M, Zhang Q, Adachi Y, Li YJ, Sugawara Y. Direct observation of atomic step edges on the rutile TiO 2(110)-(1 × 1) surface using atomic force microscopy. Phys Chem Chem Phys 2018; 20:28331-28337. [PMID: 30398504 DOI: 10.1039/c8cp06156d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Clarifying the atomic configuration of step edges on a rutile TiO2 surface is crucial for understanding its fundamental reactivity, and the direct observation of atomic step edges is still a challenge. AFM is a powerful tool for investigating surface structures with true atomic resolution, and it provides the opportunity to resolve the real structure of step edges with improved techniques. In this work, we successfully imaged the atomic configuration of 001 and 1-11 step edges on the surface of rutile TiO2(110)-(1 × 1), and we present the direct observation of oxygen vacancies along the 1-11 step edges, indicating that one 1-11 step edge site corresponds to one oxygen vacancy using AFM. We also made use of the simultaneous AFM/STM measurements to explore the electronic structure of step edges, which enhanced the evidence of oxygen vacancies existing along the 1-11 step edges and further demonstrated that the 001 step edge was terminated by an O row. The effect of the reduced 1-11 step edges was explored by probing the O2 adsorption and the nucleation behavior of gold clusters. It was found that oxygen vacancies along the 1-11 step edges could contribute to O2 dissociative adsorption and there was no obvious difference compared with the oxygen vacancies on the flat terrace. The reduced step edge and terrace likewise acted as nucleation and growth sites for gold atoms/nanoparticles, in line with previous reports. The present study provides a complete characterization of the atomic configuration of the step edges on the TiO2(110) surface and plays an important role in investigating the surface chemistry of metal oxides.
Collapse
Affiliation(s)
- Huan Fei Wen
- Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
| | | | | | | | | | | |
Collapse
|
27
|
Li Y, Chen X, Wang C, Zhang C, He H. Sodium Enhances Ir/TiO2 Activity for Catalytic Oxidation of Formaldehyde at Ambient Temperature. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03026] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yaobin Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Xueyan Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chunying Wang
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Changbin Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
28
|
Yim CM, Chen J, Zhang Y, Shaw BJ, Pang CL, Grinter DC, Bluhm H, Salmeron M, Muryn CA, Michaelides A, Thornton G. Visualization of Water-Induced Surface Segregation of Polarons on Rutile TiO 2(110). J Phys Chem Lett 2018; 9:4865-4871. [PMID: 30081626 DOI: 10.1021/acs.jpclett.8b01904] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Water-oxide surfaces are ubiquitous in nature and of widespread importance to phenomena like corrosion as well as contemporary industrial challenges such as energy production through water splitting. So far, a reasonably robust understanding of the structure of such interfaces under certain conditions has been obtained. Considerably less is known about how overlayer water modifies the inherent reactivity of oxide surfaces. Here we address this issue experimentally for rutile TiO2(110) using scanning tunneling microscopy and photoemission, with complementary density functional theory calculations. Through detailed studies of adsorbed water nanoclusters and continuous water overlayers, we determine that excess electrons in TiO2 are attracted to the top surface layer by water molecules. Measurements on methanol show similar behavior. Our results suggest that adsorbate-induced surface segregation of polarons could be a general phenomenon for technologically relevant oxide materials, with consequences for surface chemistry and the associated catalytic activity.
Collapse
Affiliation(s)
- Chi M Yim
- Department of Chemistry and London Centre for Nanotechnology , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - Ji Chen
- Department of Physics and Astronomy, London Centre for Nanotechnology and Thomas Young Centre , University College London , London WC1E 6BT , United Kingdom
| | - Yu Zhang
- Department of Chemistry and London Centre for Nanotechnology , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - Bobbie-Jean Shaw
- Department of Chemistry and London Centre for Nanotechnology , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - Chi L Pang
- Department of Chemistry and London Centre for Nanotechnology , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - David C Grinter
- Department of Chemistry and London Centre for Nanotechnology , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - Hendrik Bluhm
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
- Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Miquel Salmeron
- Materials Science Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Christopher A Muryn
- School of Chemistry , The University of Manchester , Manchester M13 9PL , United Kingdom
| | - Angelos Michaelides
- Department of Physics and Astronomy, London Centre for Nanotechnology and Thomas Young Centre , University College London , London WC1E 6BT , United Kingdom
| | - Geoff Thornton
- Department of Chemistry and London Centre for Nanotechnology , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| |
Collapse
|
29
|
Meier M, Hulva J, Jakub Z, Pavelec J, Setvin M, Bliem R, Schmid M, Diebold U, Franchini C, Parkinson GS. Water agglomerates on Fe 3O 4(001). Proc Natl Acad Sci U S A 2018; 115:E5642-E5650. [PMID: 29866854 PMCID: PMC6016784 DOI: 10.1073/pnas.1801661115] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Determining the structure of water adsorbed on solid surfaces is a notoriously difficult task and pushes the limits of experimental and theoretical techniques. Here, we follow the evolution of water agglomerates on Fe3O4(001); a complex mineral surface relevant in both modern technology and the natural environment. Strong OH-H2O bonds drive the formation of partially dissociated water dimers at low coverage, but a surface reconstruction restricts the density of such species to one per unit cell. The dimers act as an anchor for further water molecules as the coverage increases, leading first to partially dissociated water trimers, and then to a ring-like, hydrogen-bonded network that covers the entire surface. Unraveling this complexity requires the concerted application of several state-of-the-art methods. Quantitative temperature-programmed desorption (TPD) reveals the coverage of stable structures, monochromatic X-ray photoelectron spectroscopy (XPS) shows the extent of partial dissociation, and noncontact atomic force microscopy (AFM) using a CO-functionalized tip provides a direct view of the agglomerate structure. Together, these data provide a stringent test of the minimum-energy configurations determined via a van der Waals density functional theory (DFT)-based genetic search.
Collapse
Affiliation(s)
- Matthias Meier
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria
- Center for Computational Materials Science, Faculty of Physics, University of Vienna, 1090 Vienna, Austria
| | - Jan Hulva
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria
| | - Zdeněk Jakub
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria
| | - Jiří Pavelec
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria
| | - Martin Setvin
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria
| | - Roland Bliem
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria
| | - Michael Schmid
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria
| | - Ulrike Diebold
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria
| | - Cesare Franchini
- Center for Computational Materials Science, Faculty of Physics, University of Vienna, 1090 Vienna, Austria
| | - Gareth S Parkinson
- Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria;
| |
Collapse
|
30
|
DeVine JA, Abou Taka A, Babin MC, Weichman ML, Hratchian HP, Neumark DM. High-resolution photoelectron spectroscopy of TiO3H2−: Probing the TiO2− + H2O dissociative adduct. J Chem Phys 2018; 148:222810. [DOI: 10.1063/1.5018414] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- Jessalyn A. DeVine
- Department of Chemistry, University of California, Berkeley, California 94720, USA
| | - Ali Abou Taka
- Chemistry and Chemical Biology, University of California, Merced, California 05343, USA
| | - Mark C. Babin
- Department of Chemistry, University of California, Berkeley, California 94720, USA
| | - Marissa L. Weichman
- Department of Chemistry, University of California, Berkeley, California 94720, USA
| | - Hrant P. Hratchian
- Chemistry and Chemical Biology, University of California, Merced, California 05343, USA
| | - Daniel M. Neumark
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| |
Collapse
|
31
|
Guo Q, Zhou C, Ma Z, Ren Z, Fan H, Yang X. Elementary Chemical Reactions in Surface Photocatalysis. Annu Rev Phys Chem 2018; 69:451-472. [DOI: 10.1146/annurev-physchem-052516-044933] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Qing Guo
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, Liaoning, China;, , , , ,
| | - Chuanyao Zhou
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, Liaoning, China;, , , , ,
| | - Zhibo Ma
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, Liaoning, China;, , , , ,
| | - Zefeng Ren
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, Liaoning, China;, , , , ,
| | - Hongjun Fan
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, Liaoning, China;, , , , ,
| | - Xueming Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, Liaoning, China;, , , , ,
| |
Collapse
|
32
|
Naitabdi A, Boucly A, Rochet F, Fagiewicz R, Olivieri G, Bournel F, Benbalagh R, Sirotti F, Gallet JJ. CO oxidation activity of Pt, Zn and ZnPt nanocatalysts: a comparative study by in situ near-ambient pressure X-ray photoelectron spectroscopy. NANOSCALE 2018; 10:6566-6580. [PMID: 29577122 DOI: 10.1039/c7nr07981h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The investigation of nanocatalysts under ambient pressure by X-ray photoelectron spectroscopy gives access to a wealth of information on their chemical state under reaction conditions. Considering the paradigmatic CO oxidation reaction, a strong synergistic effect on CO catalytic oxidation was recently observed on a partly dewetted ZnO(0001)/Pt(111) single crystal surface. In order to bridge the material gap, we have examined whether this inverse metal/oxide catalytic effect could be transposed on supported ZnPt nanocatalysts deposited on rutile TiO2(110). Synchrotron radiation near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) operated at 1 mbar of O2 : CO mixture (4 : 1) was used at a temperature range between room temperature and 450 K. To tackle the complexity of the problem, we have also studied the catalytic activity of nanoparticles (NPs) of the same size, consisting of pure Pt and Zn nanoparticles (NPs), for which, moreover, NAP-XPS studies are a novelty. The comparative approach shows that the CO oxidation process is markedly different for the pure Pt and pure Zn NPs. For pure Pt NPs, CO poisoned the metallic surfaces at low temperature at the onset of CO2 evolution. In contrast, the pure Zn NPs first oxidize into ZnO, and trap carbonates at low temperature. Then they start to release CO2 in the gas phase, at a critical temperature, while continuously producing it. The pure Zn NPs are also immune to support encapsulation. The bimetallic nanoparticle borrows some of its characteristics from its two parent metals. In fact, the ZnPt NP, although produced by the sequential deposition of platinum and zinc, is platinum-terminated below the temperature onset of CO oxidation and poisoned by CO. Above the CO oxidation onset, the nanoparticle becomes Zn-rich with a ZnO shell. Pure Pt and ZnPt NPs present a very similar activity towards CO oxidation, in contrast with what is reported in a single crystal study. The present study demonstrates the effectiveness of NAP-XPS in the study of complex catalytic processes at work on nanocatalysts under near-ambient pressures, and highlights once more the difficulty of transposing single crystal surface observations to the case of nanoobjects.
Collapse
Affiliation(s)
- Ahmed Naitabdi
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement, 4 place Jussieu, 75005 Paris, France.
| | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Foroutan M, Darvishi M, Mahmood Fatemi S, Hamideh Babazadeh K. Water chain formation on rutile TiO2 (110) nanocrystal: A molecular dynamics simulation approach. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.12.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
34
|
Xu F, Fampiou I, O'Connor CR, Karakalos S, Hiebel F, Kaxiras E, Madix RJ, Friend CM. Water facilitates oxygen migration on gold surfaces. Phys Chem Chem Phys 2018; 20:2196-2204. [DOI: 10.1039/c7cp06451a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Oxygen exchange between surface oxygen atom and isotopic labeled water vapor through transient hydroxyl pairs on Au(110) surface.
Collapse
Affiliation(s)
- Fang Xu
- Department of Chemistry and Chemical Biology, Harvard University
- Cambridge
- USA
| | - Ioanna Fampiou
- Department of Chemistry and Chemical Biology, Harvard University
- Cambridge
- USA
| | | | - Stavros Karakalos
- Department of Chemistry and Chemical Biology, Harvard University
- Cambridge
- USA
| | - Fanny Hiebel
- Department of Chemistry and Chemical Biology, Harvard University
- Cambridge
- USA
| | - Efthimios Kaxiras
- Department of Physics, Harvard University, Cambridge
- USA
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge
- USA
| | - Robert J. Madix
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge
- USA
| | - Cynthia M. Friend
- Department of Chemistry and Chemical Biology, Harvard University
- Cambridge
- USA
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge
- USA
| |
Collapse
|
35
|
Liang L, Li K, Lv K, Ho W, Duan Y. Highly photoreactive TiO 2 hollow microspheres with super thermal stability for acetone oxidation. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(17)62952-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
|
36
|
Dissociative Water Adsorption on Gas-Phase Titanium Dioxide Cluster Anions Probed with Infrared Photodissociation Spectroscopy. Top Catal 2017. [DOI: 10.1007/s11244-017-0863-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
37
|
Nadeem IM, Harrison GT, Wilson A, Pang CL, Zegenhagen J, Thornton G. Bridging Hydroxyls on Anatase TiO2(101) by Water Dissociation in Oxygen Vacancies. J Phys Chem B 2017; 122:834-839. [DOI: 10.1021/acs.jpcb.7b06955] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Immad M. Nadeem
- London
Centre for Nanotechnology and Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, U.K
- Diamond Light Source Ltd., Harwell Science and
Innovation Campus, Didcot, Oxfordshire, OX11 0DE, U.K
| | - George T. Harrison
- London
Centre for Nanotechnology and Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, U.K
| | - Axel Wilson
- London
Centre for Nanotechnology and Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, U.K
| | - Chi L. Pang
- London
Centre for Nanotechnology and Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, U.K
| | - Jörg Zegenhagen
- Diamond Light Source Ltd., Harwell Science and
Innovation Campus, Didcot, Oxfordshire, OX11 0DE, U.K
| | - Geoff Thornton
- London
Centre for Nanotechnology and Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, U.K
| |
Collapse
|
38
|
Guan DW, Wang RM, Jin XC, Dai DX, Ma ZB, Fan HJ, Yang XM. Diffusion of Formaldehyde on Rutile TiO2(110) Assisted by Surface Hydroxyl Groups. CHINESE J CHEM PHYS 2017. [DOI: 10.1063/1674-0068/30/cjcp1703030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
39
|
Wu CY, Tu KJ, Deng JP, Lo YS, Wu CH. Markedly Enhanced Surface Hydroxyl Groups of TiO₂ Nanoparticles with Superior Water-Dispersibility for Photocatalysis. MATERIALS 2017; 10:ma10050566. [PMID: 28772926 PMCID: PMC5459044 DOI: 10.3390/ma10050566] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 05/07/2017] [Accepted: 05/19/2017] [Indexed: 01/24/2023]
Abstract
The benefits of increasing the number of surface hydroxyls on TiO2 nanoparticles (NPs) are known for environmental and energy applications; however, the roles of the hydroxyl groups have not been characterized and distinguished. Herein, TiO2 NPs with abundant surface hydroxyl groups were prepared using commercial titanium dioxide (ST-01) powder pretreated with alkaline hydrogen peroxide. Through this simple treatment, the pure anatase phase was retained with an average crystallite size of 5 nm and the surface hydroxyl group density was enhanced to 12.0 OH/nm2, estimated by thermogravimetric analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Especially, this treatment increased the amounts of terminal hydroxyls five- to six-fold, which could raise the isoelectric point and the positive charges on the TiO2 surface in water. The photocatalytic efficiency of the obtained TiO2 NPs was investigated by the photodegradation of sulforhodamine B under visible light irradiation as a function of TiO2 content, pH of solution, and initial dye concentration. The high surface hydroxyl group density of TiO2 NPs can not only enhance water-dispersibility but also promote dye sensitization by generating more hydroxyl radicals.
Collapse
Affiliation(s)
- Chung-Yi Wu
- Department of Biomedical Engineering and Environmental Sciences, College of Nuclear Science, National Tsing Hua University, Hsinchu 30013, Taiwan.
| | - Kuan-Ju Tu
- Department of Biomedical Engineering and Environmental Sciences, College of Nuclear Science, National Tsing Hua University, Hsinchu 30013, Taiwan.
| | - Jin-Pei Deng
- Department of Chemistry, Tamkang University, Taipei 25137, Taiwan.
| | - Yu-Shiu Lo
- Department of Biomedical Engineering and Environmental Sciences, College of Nuclear Science, National Tsing Hua University, Hsinchu 30013, Taiwan.
| | - Chien-Hou Wu
- Department of Biomedical Engineering and Environmental Sciences, College of Nuclear Science, National Tsing Hua University, Hsinchu 30013, Taiwan.
| |
Collapse
|
40
|
Wang Y, Wöll C. IR spectroscopic investigations of chemical and photochemical reactions on metal oxides: bridging the materials gap. Chem Soc Rev 2017; 46:1875-1932. [DOI: 10.1039/c6cs00914j] [Citation(s) in RCA: 130] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In this review, we highlight recent progress (2008–2016) in infrared reflection absorption spectroscopy (IRRAS) studies on oxide powders achieved by using different types of metal oxide single crystals as reference systems.
Collapse
Affiliation(s)
- Yuemin Wang
- Institute of Functional Interfaces
- Karlsruhe Institute of Technology
- Eggenstein-Leopoldshafen
- Germany
| | - Christof Wöll
- Institute of Functional Interfaces
- Karlsruhe Institute of Technology
- Eggenstein-Leopoldshafen
- Germany
| |
Collapse
|
41
|
Iachella M, Wilson A, Naitabdi A, Bernard R, Prévot G, Loffreda D. Promoter effect of hydration on the nucleation of nanoparticles: direct observation for gold and copper on rutile TiO2 (110). NANOSCALE 2016; 8:16475-16485. [PMID: 27603921 DOI: 10.1039/c6nr02466a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Direct observation of the promoting effect of hydration on the nucleation of gold and copper nanoparticles supported on partially reduced rutile TiO2 (110) is achieved by combined scanning tunneling microscopy experiments and density functional theory calculations. The experiments show a clear difference between the two metals. Gold nanoparticles grow at the vicinity of the surface hydroxyl domains, whereas the nucleation of copper is not substantially affected by hydration. The nucleation of gold on surface oxygen vacancies is observed although this is not the only preferential site. Theoretical calculations of the coadsorbed phases of gold, copper and hydroxyl species on stoichiometric and reduced TiO2 (110) surfaces under relevant conditions of temperature and pressure support the experimental interpretation. Surface hydration tends to stabilize significantly gold adsorption on the stoichiometric support, while its influence on copper adsorption is not pronounced. The theoretical analysis shows that the early stages of the nucleation on hydrated stoichiometric surfaces correspond to mono-hydroxylated metallic species co-chemisorbed with hydroxyl species, whereas those on hydrated reduced surfaces are metallic atoms bound to oxygen vacancies and weakly perturbed by surface hydration.
Collapse
Affiliation(s)
- Mathilde Iachella
- Univ Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F-69342, Lyon, France.
| | | | | | | | | | | |
Collapse
|
42
|
Yim CM, Watkins MB, Wolf MJ, Pang CL, Hermansson K, Thornton G. Engineering Polarons at a Metal Oxide Surface. PHYSICAL REVIEW LETTERS 2016; 117:116402. [PMID: 27661706 DOI: 10.1103/physrevlett.117.116402] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Indexed: 06/06/2023]
Abstract
Polarons in metal oxides are important in processes such as catalysis, high temperature superconductivity, and dielectric breakdown in nanoscale electronics. Here, we study the behavior of electron small polarons associated with oxygen vacancies at rutile TiO_{2}(110), using a combination of low temperature scanning tunneling microscopy (STM), density functional theory, and classical molecular dynamics calculations. We find that the electrons are symmetrically distributed around isolated vacancies at 78 K, but as the temperature is reduced, their distributions become increasingly asymmetric, confirming their polaronic nature. By manipulating isolated vacancies with the STM tip, we show that particular configurations of polarons are preferred for given locations of the vacancies, which we ascribe to small residual electric fields in the surface. We also form a series of vacancy complexes and manipulate the Ti ions surrounding them, both of which change the associated electronic distributions. Thus, we demonstrate that the configurations of polarons can be engineered, paving the way for the construction of conductive pathways relevant to resistive switching devices.
Collapse
Affiliation(s)
- C M Yim
- Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - M B Watkins
- School of Mathematics and Physics, University of Lincoln, Brayford Pool, Lincoln LN6 7TS, United Kingdom
| | - M J Wolf
- Department of Physics & Astronomy and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom
- Department of Chemistry, Ångström Laboratory, Uppsala University, Box 538, S-751 21 Uppsala, Sweden
| | - C L Pang
- Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - K Hermansson
- Department of Chemistry, Ångström Laboratory, Uppsala University, Box 538, S-751 21 Uppsala, Sweden
| | - G Thornton
- Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| |
Collapse
|
43
|
Zheng T, Wu C, Chen M, Zhang Y, Cummings PT. A DFT study of water adsorption on rutile TiO2 (110) surface: The effects of surface steps. J Chem Phys 2016; 145:044702. [DOI: 10.1063/1.4958969] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ting Zheng
- State Key Laboratory of Robotics and System, and School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
- Department of Chemical and Biomolecular Engineering, and Multiscale Modeling and Simulation Center, Vanderbilt University, Nashville, Tennessee 37235-1604, USA
| | - Chunya Wu
- State Key Laboratory of Robotics and System, and School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Mingjun Chen
- State Key Laboratory of Robotics and System, and School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Yu Zhang
- Department of Chemical and Biomolecular Engineering, and Multiscale Modeling and Simulation Center, Vanderbilt University, Nashville, Tennessee 37235-1604, USA
| | - Peter T. Cummings
- Department of Chemical and Biomolecular Engineering, and Multiscale Modeling and Simulation Center, Vanderbilt University, Nashville, Tennessee 37235-1604, USA
| |
Collapse
|
44
|
Tang M, Cziczo DJ, Grassian VH. Interactions of Water with Mineral Dust Aerosol: Water Adsorption, Hygroscopicity, Cloud Condensation, and Ice Nucleation. Chem Rev 2016; 116:4205-59. [DOI: 10.1021/acs.chemrev.5b00529] [Citation(s) in RCA: 228] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mingjin Tang
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Daniel J. Cziczo
- Department
of Earth, Atmospheric and Planetary Sciences and Civil and Environmental
Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Vicki H. Grassian
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
- Departments
of Chemistry and Biochemistry, Nanoengineering and Scripps Institution
of Oceanography, University of California San Diego, La Jolla, California 92093, United States
| |
Collapse
|
45
|
Li Y, Zhang C, He H, Zhang J, Chen M. Influence of alkali metals on Pd/TiO2 catalysts for catalytic oxidation of formaldehyde at room temperature. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01521a] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We previously observed that sodium (Na) addition had a dramatic promotion effect on Pd/TiO2 catalysts for formaldehyde (HCHO) oxidation.
Collapse
Affiliation(s)
- Yaobin Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| | - Changbin Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| | - Jianghao Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| | - Min Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| |
Collapse
|
46
|
Guo Q, Zhou C, Ma Z, Ren Z, Fan H, Yang X. Elementary photocatalytic chemistry on TiO2surfaces. Chem Soc Rev 2016; 45:3701-30. [DOI: 10.1039/c5cs00448a] [Citation(s) in RCA: 250] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In this article, we review the recent advances in the photoreactions of small molecules with model TiO2surfaces, and propose a photocatalytical model based on nonadiabatic dynamics and ground state surface reactions.
Collapse
Affiliation(s)
- Qing Guo
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Dalian 116023
- P. R. China
| | - Chuanyao Zhou
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Dalian 116023
- P. R. China
| | - Zhibo Ma
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Dalian 116023
- P. R. China
| | - Zefeng Ren
- International Center for Quantum Materials and School of Physics
- Peking University
- Beijing
- P. R. China
- Collaborative Innovation Center of Quantum Matter
| | - Hongjun Fan
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Dalian 116023
- P. R. China
| | - Xueming Yang
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Dalian 116023
- P. R. China
| |
Collapse
|
47
|
Jöhr R, Hinaut A, Pawlak R, Sadeghi A, Saha S, Goedecker S, Such B, Szymonski M, Meyer E, Glatzel T. Characterization of individual molecular adsorption geometries by atomic force microscopy: Cu-TCPP on rutile TiO2 (110). J Chem Phys 2015; 143:094202. [PMID: 26342363 DOI: 10.1063/1.4929608] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Functionalized materials consisting of inorganic substrates with organic adsorbates play an increasing role in emerging technologies like molecular electronics or hybrid photovoltaics. For such applications, the adsorption geometry of the molecules under operating conditions, e.g., ambient temperature, is crucial because it influences the electronic properties of the interface, which in turn determine the device performance. So far detailed experimental characterization of adsorbates at room temperature has mainly been done using a combination of complementary methods like photoelectron spectroscopy together with scanning tunneling microscopy. However, this approach is limited to ensembles of adsorbates. In this paper, we show that the characterization of individual molecules at room temperature, comprising the determination of the adsorption configuration and the electrostatic interaction with the surface, can be achieved experimentally by atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). We demonstrate this by identifying two different adsorption configurations of isolated copper(ii) meso-tetra (4-carboxyphenyl) porphyrin (Cu-TCPP) on rutile TiO2 (110) in ultra-high vacuum. The local contact potential difference measured by KPFM indicates an interfacial dipole due to electron transfer from the Cu-TCPP to the TiO2. The experimental results are verified by state-of-the-art first principles calculations. We note that the improvement of the AFM resolution, achieved in this work, is crucial for such accurate calculations. Therefore, high resolution AFM at room temperature is promising for significantly promoting the understanding of molecular adsorption.
Collapse
Affiliation(s)
- Res Jöhr
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Antoine Hinaut
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Rémy Pawlak
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Ali Sadeghi
- Physics Department, Shahid Beheshti University, G. C., Evin, 19839 Tehran, Iran
| | - Santanu Saha
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Stefan Goedecker
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Bartosz Such
- Department of Physics, Jagiellonian University, Lojasiewicza 11, 30-348 Krakow, Poland
| | - Marek Szymonski
- Department of Physics, Jagiellonian University, Lojasiewicza 11, 30-348 Krakow, Poland
| | - Ernst Meyer
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Thilo Glatzel
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| |
Collapse
|
48
|
Huang L, Jia J, Liu H, Yuan Y, Zhao J, Chen S, Fan W, Waclawik ER, Zhu H, Zheng Z. Surface-mediated selective photocatalytic aerobic oxidation reactions on TiO2 nanofibres. RSC Adv 2015. [DOI: 10.1039/c5ra07518a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The interaction between photocatalyst surface and the reactants may outweigh its light absorption ability in photocatalytic activities.
Collapse
Affiliation(s)
- Lizhi Huang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Jianfeng Jia
- The School of Chemical and Material Science
- Shanxi Normal University
- Linfen 041004
- China
| | - Hongwei Liu
- School of Chemistry
- Physics and Mechanical Engineering Queensland University of Technology
- Brisbane
- Australia
| | - Yong Yuan
- National Engineering Research Center of Clean Coal Combustion
- Xi'an Thermal Power Research Institute Co. Ltd
- Xi'an 710032
- P. R. China
| | - Jian Zhao
- School of Chemistry
- Physics and Mechanical Engineering Queensland University of Technology
- Brisbane
- Australia
| | - Shuai Chen
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Weibin Fan
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Eric R. Waclawik
- School of Chemistry
- Physics and Mechanical Engineering Queensland University of Technology
- Brisbane
- Australia
| | - Huaiyong Zhu
- School of Chemistry
- Physics and Mechanical Engineering Queensland University of Technology
- Brisbane
- Australia
| | - Zhanfeng Zheng
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| |
Collapse
|
49
|
Lee C, Aikens CM. Water Adsorption and Dissociation Processes on Small Mn-Doped TiO2 Complexes. J Phys Chem A 2014; 118:598-605. [DOI: 10.1021/jp410049j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Choongkeun Lee
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Christine M. Aikens
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| |
Collapse
|
50
|
Petrik NG, Kimmel GA. Probing the photochemistry of chemisorbed oxygen on TiO2(110) with Kr and other co-adsorbates. Phys Chem Chem Phys 2014; 16:2338-46. [DOI: 10.1039/c3cp54195a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|