1
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Liao GJ, Hsueh WH, Yen YH, Shih YC, Wang CH, Wang JH, Luo MF. Decomposition of methanol-d 4 on Rh nanoclusters supported by thin-film Al 2O 3/NiAl(100) under near-ambient-pressure conditions. Phys Chem Chem Phys 2024; 26:5059-5069. [PMID: 38258542 DOI: 10.1039/d3cp05303b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
The decomposition of methanol-d4 (CD3OD) on Rh nanoclusters grown by the deposition of Rh vapors onto an ordered thin film of Al2O3/NiAl(100) was studied, with various surface-probe techniques and largely under near-ambient-pressure (NAP) conditions. The results showed a superior reactivity of small Rh clusters (diameter < 1.5 nm) exposed to CD3OD at 5 × 10-3-0.1 mbar at 400 K; the gaseous production of CO and D2 from decomposed methanol-d4 per Rh surface site on the small Rh clusters with diameters of ∼1.1 nm was nearly 8 times that on large ones with diameters of ∼3.5 nm. The promotion of reactivity with decreased cluster size under NAP conditions was evidently greater than that under ultrahigh vacuum conditions. Moreover, the concentration of atomic carbon (C*; where * denotes adsorbate)-a key catalyst poisoner-yielded from the dissociation of CO* from dehydrogenated methanol-d4 was significantly smaller on small clusters (diameter < 1.5 nm). The NAP size effect on methanol-d4 decomposition involved the surface hydroxyl (OH*) from the little co-adsorbed water (H2O*) that was dissociated at a probability dependent on the cluster size. H2O* was more likely dissociated into OH* on small Rh clusters, by virtue of their more reactive d-band structure, and the OH* then effectively promoted the O-D cleavage of methanol-d4, as the rate-determining step, and thus the reaction probability; on the other hand, the OH* limited CO* dissociation on small Rh clusters via both adsorbate and lateral effects. These results suggest that the superior properties of small Rh clusters in both reactivity and anti-poisoning would persist and be highly applicable under "real-world" catalysis conditions.
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Affiliation(s)
- Guan-Jr Liao
- Department of Physics, National Central University, No. 300 Jhongda Road, Jhongli 32054, Taiwan.
| | - Wen-Hao Hsueh
- Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Ting-Zhou Road, Taipei, Taiwan.
| | - Yu-Hsiang Yen
- Department of Physics, National Central University, No. 300 Jhongda Road, Jhongli 32054, Taiwan.
| | - Yi-Chan Shih
- Department of Physics, National Central University, No. 300 Jhongda Road, Jhongli 32054, Taiwan.
| | - Chia-Hsin Wang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan
| | - Jeng-Han Wang
- Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Ting-Zhou Road, Taipei, Taiwan.
| | - Meng-Fan Luo
- Department of Physics, National Central University, No. 300 Jhongda Road, Jhongli 32054, Taiwan.
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2
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Hsueh JW, Kuo LH, Chen PH, Chen WH, Chuang CY, Kuo CN, Lue CS, Lai YL, Liu BH, Wang CH, Hsu YJ, Lin CL, Chou JP, Luo MF. Investigating the role of undercoordinated Pt sites at the surface of layered PtTe 2 for methanol decomposition. Nat Commun 2024; 15:653. [PMID: 38253575 PMCID: PMC10803346 DOI: 10.1038/s41467-024-44840-z] [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: 05/23/2023] [Accepted: 01/08/2024] [Indexed: 01/24/2024] Open
Abstract
Transition metal dichalcogenides, by virtue of their two-dimensional structures, could provide the largest active surface for reactions with minimal materials consumed, which has long been pursued in the design of ideal catalysts. Nevertheless, their structurally perfect basal planes are typically inert; their surface defects, such as under-coordinated atoms at the surfaces or edges, can instead serve as catalytically active centers. Here we show a reaction probability > 90 % for adsorbed methanol (CH3OH) on under-coordinated Pt sites at surface Te vacancies, produced with Ar+ bombardment, on layered PtTe2 - approximately 60 % of the methanol decompose to surface intermediates CHxO (x = 2, 3) and 35 % to CHx (x = 1, 2), and an ultimate production of gaseous molecular hydrogen, methane, water and formaldehyde. The characteristic reactivity is attributed to both the triangular positioning and varied degrees of oxidation of the under-coordinated Pt at Te vacancies.
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Affiliation(s)
- Jing-Wen Hsueh
- Department of Physics, National Central University, No. 300 Jhongda Rd., Jhongli District, Taoyuan City, 320317, Taiwan
| | - Lai-Hsiang Kuo
- Department of Physics, National Central University, No. 300 Jhongda Rd., Jhongli District, Taoyuan City, 320317, Taiwan
| | - Po-Han Chen
- Department of Materials Science and Engineering, National Tsing Hua University, 101, Section 2 Kuang-Fu Road, Hsinchu, 300044, Taiwan
| | - Wan-Hsin Chen
- Department of Electrophysics, National Yang Ming Chiao Tung University, No. 1001 University Rd., Hsinchu, 300039, Taiwan
| | - Chi-Yao Chuang
- Department of Electrophysics, National Yang Ming Chiao Tung University, No. 1001 University Rd., Hsinchu, 300039, Taiwan
| | - Chia-Nung Kuo
- Department of Physics, National Cheng Kung University, No. 1 University Rd., Tainan, 701, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, National Science and Technology Council, Taipei, 10601, Taiwan
| | - Chin-Shan Lue
- Department of Physics, National Cheng Kung University, No. 1 University Rd., Tainan, 701, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, National Science and Technology Council, Taipei, 10601, Taiwan
- Program on Key Materials, Academy of Innovative Semiconductor and Sustainable Manufacturing, National Cheng Kung University, Tainan, 701, Taiwan
| | - Yu-Ling Lai
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Rd., Hsinchu Science Park, Hsinchu, 300092, Taiwan
| | - Bo-Hong Liu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Rd., Hsinchu Science Park, Hsinchu, 300092, Taiwan
| | - Chia-Hsin Wang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Rd., Hsinchu Science Park, Hsinchu, 300092, Taiwan
| | - Yao-Jane Hsu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Rd., Hsinchu Science Park, Hsinchu, 300092, Taiwan
| | - Chun-Liang Lin
- Department of Electrophysics, National Yang Ming Chiao Tung University, No. 1001 University Rd., Hsinchu, 300039, Taiwan.
| | - Jyh-Pin Chou
- Department of Physics, National Changhua University of Education, No. 1, Jin-De Rd., Changhua, 50007, Taiwan.
| | - Meng-Fan Luo
- Department of Physics, National Central University, No. 300 Jhongda Rd., Jhongli District, Taoyuan City, 320317, Taiwan.
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3
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Liao GJ, Hsueh WH, Yen YH, Shih YC, Wang CH, Wang JH, Luo MF. Decomposition of methanol-d4 on a thin film of Al2O3/NiAl(100) under near-ambient-pressure conditions. J Chem Phys 2023; 158:2887766. [PMID: 37129140 DOI: 10.1063/5.0151135] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Accepted: 04/17/2023] [Indexed: 05/03/2023] Open
Abstract
We have studied the decomposition of methanol-d4 on thin film Al2O3/NiAl(100) under near-ambient-pressure conditions, with varied surface-probe techniques and calculations based on density-functional theory. Methanol-d4 neither adsorbed nor reacted on Al2O3/NiAl(100) at 400 K under ultrahigh vacuum conditions, whereas they dehydrogenated, largely to methoxy-d3 (CD3O*, * denoting adsorbates) and formaldehyde-d2 (CD2O*), on the surface when the methanol-d4 partial pressure was increased to 10-3 mbar and above. The dehydrogenation was facilitated by hydroxyl (OH* or OD*) from the dissociation of little co-adsorbed water; a small fraction of CD2O* interacted further with OH* (OD*) to form, via intermediate CD2OOH* (CD2OOD*), formic acid (DCOOH* or DCOOD*). A few surface carbonates were also yielded, likely on the defect sites of Al2O3/NiAl(100). The results suggest that alumina not only supports metal clusters but also participates in reactions under realistic catalytic conditions. One may consider accordingly the multiple functions of alumina while designing ideal catalysts.
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Affiliation(s)
- Guan-Jr Liao
- Department of Physics, National Central University, No. 300 Jhongda Road, Jhongli 32054, Taiwan
| | - Wen-Hao Hsueh
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Road, Taipei, Taiwan
| | - Yu-Hsiang Yen
- Department of Physics, National Central University, No. 300 Jhongda Road, Jhongli 32054, Taiwan
| | - Yi-Chan Shih
- Department of Physics, National Central University, No. 300 Jhongda Road, Jhongli 32054, Taiwan
| | - Chia-Hsin Wang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan
| | - Jeng-Han Wang
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Road, Taipei, Taiwan
| | - Meng-Fan Luo
- Department of Physics, National Central University, No. 300 Jhongda Road, Jhongli 32054, Taiwan
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4
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Phan TT, Dao LTT, Giang LPT, Nguyen MT, Nguyen HMT. Mechanistic insights into the dehydrogenation of formaldehyde, formic acid and methanol using the Pt 4 cluster as a promising catalyst. J Mol Graph Model 2021; 111:108096. [PMID: 34875503 DOI: 10.1016/j.jmgm.2021.108096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 11/28/2022]
Abstract
Reaction mechanisms of the dehydrogenation of formaldehyde, formic acid and methanol on the Pt4 cluster were computationally investigated using density functional theory (DFT) with the B3LYP functional in the conjunction with the aug-cc-pVTZ basis sets for H, C and O atoms, and the cc-pVDZ-PP basis set for Pt. Herein, the key mechanistic aspects of three possible pathways of the dehydrogenation of these compounds are summarized. The results indicate that the formation of H2 and CO or CO2 molecules is more energetically favorable than the generation of H and H2O, HCHO products. Generally, the formation of H2 molecule in the presence of catalysts is more favorable than the direct decomposition of either HCHO, HCOOH or CH3OH molecule. The use of Pt4 catalyst significantly reduces the energy barriers for C-H and O-H bond cleavage of all three compounds to 14, 9 and 12 kcal/mol, respectively. The decomposition of HCOOH is found to be the most energetically favorable. In addition, the mechanistic insights of the reactions confirm the reduction of the energy barriers of the gas-phase dehydrogenation by 67-82 kcal/mol and bring it to the values smaller than 14 kcal/mol in the presence of the Pt4 catalysts.
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Affiliation(s)
- Thuy Thi Phan
- Faculty of Chemistry, Vinh University, Vinh, Viet Nam
| | - Linh Thao Thi Dao
- Faculty of Chemistry and Center for Computational Science, Hanoi National University of Education, Hanoi, Viet Nam
| | - Ly Phương Thi Giang
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Viet Nam
| | - Mo Thi Nguyen
- Faculty of Chemistry and Center for Computational Science, Hanoi National University of Education, Hanoi, Viet Nam
| | - Hue Minh Thi Nguyen
- Faculty of Chemistry and Center for Computational Science, Hanoi National University of Education, Hanoi, Viet Nam.
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5
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Hung TC, Liao TW, Liao GJ, Liao ZH, Hsu PW, Lai YL, Hsu YJ, Wang CH, Yang YW, Wang JH, Luo MF. Promoted activity of annealed Rh nanoclusters on thin films of Al 2O 3/NiAl(100) in the dehydrogenation of Methanol-d 4. RSC Adv 2021; 11:24762-24771. [PMID: 35481058 PMCID: PMC9036867 DOI: 10.1039/d1ra04066a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 07/12/2021] [Indexed: 11/21/2022] Open
Abstract
Annealed Rh nanoclusters on an ordered thin film of Al2O3/NiAl(100) were shown to exhibit a promoted reactivity toward the decomposition of methanol-d4, under both ultrahigh vacuum and near-ambient-pressure conditions. The Rh clusters were grown with vapor deposition onto the Al2O3/NiAl(100) surface at 300 K and annealed to 700 K. The decomposition of methanol-d4 proceeded only through dehydrogenation, with CO and deuterium as products, on Rh clusters both as prepared and annealed. Nevertheless, the catalytic reactivity of the annealed clusters, measured with the production of either CO or deuterium per surface Rh site from the reaction, became at least 2-3 times that of the as-prepared ones. The promoted reactivity results from an altered support effect associated with an annealing-induced mass transport at the surface. Our results demonstrate a possibility to practically prepare reactive Rh clusters, regardless of the cluster size, that can tolerate an elevated reaction temperature, with no decreased reactivity.
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Affiliation(s)
- Ting-Chieh Hung
- Department of Physics, National Central University 300 Jhongda Road, Jhongli District Taoyuan 32001 Taiwan
| | - Ting-Wei Liao
- Department of Physics, National Central University 300 Jhongda Road, Jhongli District Taoyuan 32001 Taiwan
| | - Guan-Jr Liao
- Department of Physics, National Central University 300 Jhongda Road, Jhongli District Taoyuan 32001 Taiwan
| | - Zhen-He Liao
- Department of Physics, National Central University 300 Jhongda Road, Jhongli District Taoyuan 32001 Taiwan
| | - Po-Wei Hsu
- Department of Physics, National Central University 300 Jhongda Road, Jhongli District Taoyuan 32001 Taiwan
| | - Yu-Ling Lai
- National Synchrotron Radiation Research Center 101 Hsin-Ann Road, Hsinchu Science Park Hsinchu 30076 Taiwan
| | - Yao-Jane Hsu
- National Synchrotron Radiation Research Center 101 Hsin-Ann Road, Hsinchu Science Park Hsinchu 30076 Taiwan
| | - Chia-Hsin Wang
- National Synchrotron Radiation Research Center 101 Hsin-Ann Road, Hsinchu Science Park Hsinchu 30076 Taiwan
| | - Yaw-Wen Yang
- National Synchrotron Radiation Research Center 101 Hsin-Ann Road, Hsinchu Science Park Hsinchu 30076 Taiwan
| | - Jeng-Han Wang
- Department of Chemistry, National Taiwan Normal University No. 88, Sec. 4, Ting-Zhou Road Taipei 11677 Taiwan
| | - Meng-Fan Luo
- Department of Physics, National Central University 300 Jhongda Road, Jhongli District Taoyuan 32001 Taiwan
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6
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Liao GJ, Liu KT, Liao ZH, Hsu PW, Wang JH, Luo MF. Dependence on Size of Supported Rh Nanoclusters in the Dehydrogenation of Methanol- d4 Obstructed by CO. J Phys Chem Lett 2021; 12:2622-2629. [PMID: 33719453 DOI: 10.1021/acs.jpclett.1c00634] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The size effect on the activity of a catalyst has been a focal issue since ideal catalysts were pursued, whereas that on the degradation of a catalyst, by reaction intermediates such as CO, is little discussed. We demonstrate that the dehydrogenation of methanol-d4 on supported Rh nanoclusters precovered with CO (Rh-CO clusters) was obstructed, indicated by a decreased production of CO and D2; the obstructive effect exhibits a remarkable dependence on the cluster size, with a minimum at a cluster diameter near 1.4 nm. The decreased production arose from a decreased reaction probability controlled by the increased activation energy for each dehydrogenation step (including formation of methoxy-d3), adsorption energies of CO, and repulsion from the CO array on the Rh-CO surface. The effects of these factors in deactivating the clusters varied separately with the cluster size. Consequently, the size effect on the CO poisoning should be taken into account in engineering the cluster size to optimize the catalytic performance.
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Affiliation(s)
- Guan-Jr Liao
- Department of Physics, National Central University, 300 Jhongda Road, Jhongli District, Taoyuan 32001, Taiwan
| | - Kuan-Ting Liu
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Road, Taipei 11677, Taiwan
| | - Zhen-He Liao
- Department of Physics, National Central University, 300 Jhongda Road, Jhongli District, Taoyuan 32001, Taiwan
| | - Po-Wei Hsu
- Department of Physics, National Central University, 300 Jhongda Road, Jhongli District, Taoyuan 32001, Taiwan
| | - Jeng-Han Wang
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Road, Taipei 11677, Taiwan
| | - Meng-Fan Luo
- Department of Physics, National Central University, 300 Jhongda Road, Jhongli District, Taoyuan 32001, Taiwan
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7
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Ansari AS, Chern ZY, Cai PY, Huang YW, Liao GJ, Wang JH, Luo MF. Distinct dependence on size of Pt and Rh nanoclusters on graphene/Pt(111) in the decomposition of methanol-d 4. J Chem Phys 2019; 151:224707. [PMID: 31837670 DOI: 10.1063/1.5125464] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Pt and Rh nanoclusters, grown on deposition of Pt and Rh vapors onto graphene/Pt(111), show separate reactivity toward the decomposition of methanol-d4. The Pt (Rh) clusters had a mean diameter 2.0-3.5 nm (2.1-4.0 nm) and height 0.45-0.94 nm (0.41-0.9 nm) evolving with the coverage; they were structurally ordered, having an fcc phase and growing in (111) orientation, and had lattice constants similar to their bulk values. Methanol-d4 on the Pt clusters did not decompose but desorbed mostly, disparate from that on Pt(111) surface; the disparity arose as the adsorption energies of methanol-d4 on most surface sites of the Pt clusters became smaller than their single crystal counterpart. This size effect, nevertheless, did not apply on the Rh clusters, despite their similar atomic stacking; the Rh clusters showed a reactivity similar to that of the Rh(111) surface because the adsorption energies of methanol-d4 on both Rh clusters and Rh(111) are comparable. The distinct size dependence was rationalized through their electronic structures and charge distribution of Fukui function mapping. Our results suggest that reactive transition metals do not necessarily become more reactive while they are scaled down to nanoscale; their reactivity evolves with their size in a manner largely dependent on their electronic nature.
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Affiliation(s)
- A S Ansari
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Zhao-Ying Chern
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Pei-Yang Cai
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Yen-Wen Huang
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Guan-Jr Liao
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Jeng-Han Wang
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Meng-Fan Luo
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
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8
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Ma X, Kratky T, Günther S. Observation of a novel double layer surface oxide phase on Ni 3Al(111) at low temperature. NANOSCALE ADVANCES 2019; 1:4501-4512. [PMID: 36134406 PMCID: PMC9418789 DOI: 10.1039/c9na00545e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 10/12/2019] [Indexed: 06/16/2023]
Abstract
The Ni3Al(111) surface was characterized during oxidation within the temperature range of 690-800 K by in situ scanning tunneling microscopy (STM), low energy electron diffraction (LEED) and auger electron spectroscopy (AES). Within this temperature range oxygen dosing always leads to the formation of a surface aluminum oxide layer while Ni atoms remain in their metallic state. The temperature however, affects the kinetics and the structure of the grown oxides. Above 790 K the known (√67 × √67)R12.2° double layer oxide grows, which consists of two Al-O layers. Oxygen dosing at the lower temperature of 740 ± 10 K leads to a single layer oxide with only one Al-O plane. The lattice mismatch of the aligned oxygen and substrate lattices induce a (7 × 7) moiré pattern of this surface phase. Surprisingly, when lowering the sample temperature below 720 K during oxygen exposure, again a bilayer oxide grows on the Ni3Al(111) surface. The formation of this bilayer oxide starts with the growth of the single layer oxide that is subsequently covered by a second Al-O layer. At temperatures close to 720 K, the 2nd layer is ordered and a diffraction pattern is observed indicating a (4√3 × 4√3)R30° unit cell with regard to the oxygen lattice of the surface oxide. A structure model is presented that relates this so far unknown double layer oxide to the building principle of α-Al2O3. The respective growth kinetics and the availability of Al atoms dictate whether the single or the low temperature double layer oxide is formed. The related mass transport on the surface can be observed using in situ STM which allows the qualitative discussion of the growth kinetics. When lowering the oxide growth temperature below 700 K, the 2nd oxide layer is still formed ontop of the single layer oxide but in a disordered state so that the LEED pattern of the single layer oxide with a (7 × 7) moiré unit cell is again observed. This accounts for the confusing fact that the (7 × 7) moiré LEED pattern may indicate either the formation of a single or a low temperature double layer oxide.
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Affiliation(s)
- Xinzhou Ma
- Technische Universität München, Zentralinstitut für Katalyseforschung, Chemie Department, Physikalische Chemie mit Schwerpunkt Katalyse Lichtenbergstr. 4 D-85748 Garching Germany
| | - Tim Kratky
- Technische Universität München, Zentralinstitut für Katalyseforschung, Chemie Department, Physikalische Chemie mit Schwerpunkt Katalyse Lichtenbergstr. 4 D-85748 Garching Germany
| | - Sebastian Günther
- Technische Universität München, Zentralinstitut für Katalyseforschung, Chemie Department, Physikalische Chemie mit Schwerpunkt Katalyse Lichtenbergstr. 4 D-85748 Garching Germany
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9
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Hsia CL, Wang JH, Luo MF. Adsorption of an Au atom and dimer on a thin θ-Al 2O 3/NiAl(100) film: dependence on the thickness of the θ-Al 2O 3 film. RSC Adv 2018; 8:2642-2652. [PMID: 35541469 PMCID: PMC9077467 DOI: 10.1039/c7ra13081c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 01/03/2018] [Indexed: 02/05/2023] Open
Abstract
With calculations based on density-functional theory (DFT) we investigated the adsorption of a single Au atom and a dimer on thin θ-Al2O3(001) films supported on NiAl(100). The interaction of the Au adsorbates with the surface was shown to depend on the thickness of the film. The adsorption energy for an Au atom on θ-Al2O3(001)/NiAl(100) of film thickness ≤four atomic layers was significantly enhanced-over three times that on a bulk θ-Al2O3(001) surface, and accompanied with a shortened Au-oxide bond and an uplifted Au-binding Al. The strong Au-surface interaction involved a decreased work function of θ-Al2O3(001)/NiAl(100) and consequently drove charge to transfer from the substrate to the adsorbed Au atom; the charge was transferred from NiAl, through alumina, on monolayer θ-Al2O3(001)/NiAl(100), but directly from alumina on thicker layers. For an Au dimer, both upright (end-on) and flat-lying (side-on) geometries existed. The flat-lying dimer was preferred on mono- and tri-layer alumina films, having a greater adsorption energy but a weakened Au-Au bond, whereas the upright geometry prevailed for films of other thickness, having a weaker adsorption energy and being less charged, similar to that on a bulk θ-Al2O3(001) surface. The results imply an opportunity to control the properties and morphologies of metal clusters supported on an oxide film by tuning its thickness.
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Affiliation(s)
- Ching-Lun Hsia
- Department of Physics, National Central University 300 Jhongda Road, Jhongli District Taoyuan 32001 Taiwan
| | - Jeng-Han Wang
- Department of Chemistry, National Taiwan Normal University Taipei Taiwan
| | - Meng-Fan Luo
- Department of Physics, National Central University 300 Jhongda Road, Jhongli District Taoyuan 32001 Taiwan
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10
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Lee H, Liao ZH, Hsu PW, Wu YC, Cheng MC, Wang JH, Luo MF. Decomposition of methanol-d4 on Au–Rh bimetallic nanoclusters on a thin film of Al2O3/NiAl(100). Phys Chem Chem Phys 2018; 20:11260-11272. [DOI: 10.1039/c8cp01714j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity of Au nanoclusters was sharply enhanced by incorporating a few Rh atoms.
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Affiliation(s)
- Hsuan Lee
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Zhen-He Liao
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Po-Wei Hsu
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Yu-Cheng Wu
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Meng-Chin Cheng
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Jeng-Han Wang
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Meng-Fan Luo
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
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11
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Lee H, Liao ZH, Hsu PW, Hung TC, Wu YC, Lin Y, Wang JH, Luo MF. Surface structures and compositions of Au–Rh bimetallic nanoclusters supported on thin-film Al2O3/NiAl(100) probed with CO. J Chem Phys 2017; 147:044704. [DOI: 10.1063/1.4995598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Hsuan Lee
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Zhen-He Liao
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Po-Wei Hsu
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Ting-Chieh Hung
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Yu-Cheng Wu
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Yuwei Lin
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Jeng-Han Wang
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Meng-Fan Luo
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
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12
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Hsu PW, Liao ZH, Hung TC, Lee H, Wu YC, Lai YL, Hsu YJ, Lin Y, Wang JH, Luo MF. Formation and structures of Au–Rh bimetallic nanoclusters supported on a thin film of Al2O3/NiAl(100). Phys Chem Chem Phys 2017; 19:14566-14579. [DOI: 10.1039/c7cp02524f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The crystallinity, orientation, and lattice parameters of Au–Rh bimetallic clusters on Al2O3/NiAl(100) are revealed and dominated by Rh.
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Affiliation(s)
- Po-Wei Hsu
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Zhen-He Liao
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Ting-Chieh Hung
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Hsuan Lee
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Yu-Cheng Wu
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Yu-Ling Lai
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Yao-Jane Hsu
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Yuwei Lin
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Jeng-Han Wang
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Meng-Fan Luo
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
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13
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Lee H, Liao ZH, Hsu PW, Hung TC, Wu YC, Lin Y, Wang JH, Luo MF. The interaction of CO molecules on Au–Rh bimetallic nanoclusters supported on a thin film of Al2O3/NiAl(100). RSC Adv 2017. [DOI: 10.1039/c7ra00482f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The varied infrared absorption intensity of CO on bimetallic clusters reflects altered electronic states of CO-binding surface atoms.
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Affiliation(s)
- Hsuan Lee
- Department of Physics
- National Central University
- Jhongli 32001
- Taiwan
| | - Zhen-He Liao
- Department of Physics
- National Central University
- Jhongli 32001
- Taiwan
| | - Po-Wei Hsu
- Department of Physics
- National Central University
- Jhongli 32001
- Taiwan
| | - Ting-Chieh Hung
- Department of Physics
- National Central University
- Jhongli 32001
- Taiwan
| | - Yu-Cheng Wu
- Department of Physics
- National Central University
- Jhongli 32001
- Taiwan
| | - Yuwei Lin
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Jeng-Han Wang
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Meng-Fan Luo
- Department of Physics
- National Central University
- Jhongli 32001
- Taiwan
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14
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Zhang Z, Zhang RF, Legut D, Li DQ, Zhang SH, Fu ZH, Guo HB. Pinning effect of reactive elements on adhesion energy and adhesive strength of incoherent Al2O3/NiAl interface. Phys Chem Chem Phys 2016; 18:22864-73. [PMID: 27480916 DOI: 10.1039/c6cp03609k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The profound effects of reactive elements (REs) on the adhesion energy and adhesive strength of the α-Al2O3/β-NiAl interface in thermal barrier coating (TBC) systems have attracted increasing attention because RE-doping has played a significant role in improving the thermal cycling lifetime of TBCs. However, the fundamental mechanism is, so far, not well understood due to the experimental difficulty and theoretical complexity in interface modelling. For this purpose, in the present study we have performed comprehensive density functional theory calculations and information targeted experiments to underline the origin of the surprising enhancement of interface adhesion, stability and mechanical strength of the α-Al2O3/β-NiAl interface by different RE doping levels. Our results suggest that the interface failure firstly appears within the NiAl layer adjacent to the Al-terminated oxide under mechanical loading, while the formation of O-RE-Ni bond pairs at the interface can effectively hinder the interface de-cohesion, providing a higher mechanical strength. By comparing several typical REs, it is observed that Hf can emerge not only with the highest interface adhesion energy, but also the highest mechanical strength; in agreement with our experimental results. By continuously increasing the dopant concentration, the strengthening effect may increase correspondingly, but is limited by the solute solubility. These results shed light into the effect of REs on the stability and strength of the α-Al2O3/β-NiAl interface, providing theoretical guidance for interface design via a combinational analysis of bond topology and electronic structure.
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Affiliation(s)
- Z Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China. and Center for Integrated Computational Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
| | - R F Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China. and Center for Integrated Computational Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
| | - D Legut
- IT4 Innovations Center, VSB-Technical University of Ostrava, CZ-70833 Ostrava, Czech Republic
| | - D Q Li
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China.
| | - S H Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China. and Center for Integrated Computational Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
| | - Z H Fu
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China. and Center for Integrated Computational Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
| | - H B Guo
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China.
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15
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Hung TC, Liao TW, Liao ZH, Hsu PW, Cai PY, Lee H, Lai YL, Hsu YJ, Chen HY, Wang JH, Luo MF. Dependence on Size of Supported Rh Nanoclusters in the Decomposition of Methanol. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00579] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ting-Chieh Hung
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Ting-Wei Liao
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Zhen-He Liao
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Po-Wei Hsu
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Pei-Yang Cai
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Hsuan Lee
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Yu-Ling Lai
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science
Park, Hsinchu 30076, Taiwan
| | - Yao-Jane Hsu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science
Park, Hsinchu 30076, Taiwan
| | - Hui-Yu Chen
- Department
of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Jeng-Han Wang
- Department
of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Meng-Fan Luo
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
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16
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Li YD, Liao TW, Wang CX, Chao CS, Hung TC, Ho CY, Luo MF, Lai YL, Hsu YJ. The decomposition of methanol on Au–Pt bimetallic clusters supported by a thin film of Al2O3/NiAl(100). RSC Adv 2014. [DOI: 10.1039/c4ra03406f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The alloying of Pt with Au did not alter the dehydrogenation of methanol on the Pt sites but affected the scission of the C–O bond of methanol.
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Affiliation(s)
- Y.-D. Li
- Department of Physics and Center for Nano Science and Technology
- National Central University
- Jhongli 32001, Taiwan
| | - T.-W. Liao
- Department of Physics and Center for Nano Science and Technology
- National Central University
- Jhongli 32001, Taiwan
| | - C. X. Wang
- Department of Physics and Center for Nano Science and Technology
- National Central University
- Jhongli 32001, Taiwan
- College of Physics Science and Technology
- Yangzhou University
| | - C.-S. Chao
- Department of Physics and Center for Nano Science and Technology
- National Central University
- Jhongli 32001, Taiwan
| | - T.-C. Hung
- Department of Physics and Center for Nano Science and Technology
- National Central University
- Jhongli 32001, Taiwan
| | - C. Y. Ho
- Department of Physics and Center for Nano Science and Technology
- National Central University
- Jhongli 32001, Taiwan
| | - M.-F. Luo
- Department of Physics and Center for Nano Science and Technology
- National Central University
- Jhongli 32001, Taiwan
| | - Yu-Ling Lai
- National Synchrotron Radiation Research Center
- Hsinchu 30076, Taiwan
| | - Yao-Jane Hsu
- National Synchrotron Radiation Research Center
- Hsinchu 30076, Taiwan
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