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Zhang S, Johnson DD, Shelton WA, Xu Y. Hydrogen Adsorption on Ordered and Disordered Pt-Ni Alloys. Top Catal 2020. [DOI: 10.1007/s11244-020-01338-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Sohn H, Xiao Q, Seubsai A, Ye Y, Lee J, Han H, Park S, Chen G, Lu Y. Thermally Robust Porous Bimetallic (Ni xPt 1- x) Alloy Mesocrystals within Carbon Framework: High-Performance Catalysts for Oxygen Reduction and Hydrogenation Reactions. ACS APPLIED MATERIALS & INTERFACES 2019; 11:21435-21444. [PMID: 31117421 DOI: 10.1021/acsami.8b21661] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Thermally stable porous bimetallic (Ni xPt1- x) alloy mesocrystals within a carbon framework are produced via an aerosol-assisted process for high-performance catalysts for the oxygen reduction reaction (ORR) and hydrogenation. The porous Ni xPt1- x alloy has a robust composite of alloy nanoparticles with an adjustable composition and a porous carbon skeleton. Porous Ni xPt1- x alloys exhibit high thermal stability, retaining their crystalline structure and morphology at 550 °C for 6 h, as observed in thermal treatment tests under various conditions (time, temperature, and atmosphere). The porous Ni xPt1- x alloy as a catalyst for the hydrogenation of propylene has high conversion efficiency (>80%) and low activation energy ( Ea < 20 kJ/mol) at ≥80 °C through the suitable control of the element composition and a pore structure. As a catalyst for the ORR, the catalytic activity of the porous Ni xPt1- x alloy is superior to that of conventional Pt/C (0.115 mA) (0.853 mA/cmPt2 at 0.9 V/cmPt2). This is attributed to the homogeneous alloying of the metal components (Ni and Pt) and the increased accessibility of the reactants to the catalyst, resulting from the unique morphology of the porous Ni xPt1- x alloy, i.e., hierarchical structure with high porosity.
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Affiliation(s)
- Hiesang Sohn
- Department of Chemical and Biomolecular Engineering , University of California , Los Angeles , California 90095 , United States
- Department of Chemical Engineering , Kwangwoon University , 20 Kwangwoon-Ro , Nowon-Gu, Seoul 01897 , Korea
| | - Qiangfeng Xiao
- Department of Chemical and Biomolecular Engineering , University of California , Los Angeles , California 90095 , United States
- School of Automotive Studies and Clean Energy Automotive Engineering Center , Tongji University (Jiading Campus) , Shanghai 201804 , China
| | - Anusorn Seubsai
- Department of Chemical Engineering, Faculty of Engineering , Kasetsart University , Bangkok 10900 , Thailand
| | - Youngjin Ye
- Department of Chemical Engineering , Pohang University of Science and Technology (POSTECH) , Pohang 790-784 , Korea
| | - Jinwoo Lee
- Department of Chemical Engineering , Pohang University of Science and Technology (POSTECH) , Pohang 790-784 , Korea
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-338 , Korea
| | - Hyokyung Han
- Department of Chemical Engineering , Kwangwoon University , 20 Kwangwoon-Ro , Nowon-Gu, Seoul 01897 , Korea
| | - Sehkyu Park
- Department of Chemical Engineering , Kwangwoon University , 20 Kwangwoon-Ro , Nowon-Gu, Seoul 01897 , Korea
| | - Gen Chen
- Department of Chemical and Biomolecular Engineering , University of California , Los Angeles , California 90095 , United States
| | - Yunfeng Lu
- Department of Chemical and Biomolecular Engineering , University of California , Los Angeles , California 90095 , United States
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Shuttleworth IG. The quasiparticle band structures of ordered Ni xPt 1-x. Heliyon 2018; 4:e01000. [PMID: 30534621 PMCID: PMC6278777 DOI: 10.1016/j.heliyon.2018.e01000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 11/24/2018] [Accepted: 11/28/2018] [Indexed: 11/30/2022] Open
Abstract
The quasiparticle band structures of the ordered L12 and L10 phases of NixPt1-x (x = 0.25, 0.5, and 0.75) have been calculated and compared to the band structures obtained using density functional theory. For each alloy, an increase in the curvature of the band structure is generally seen when the quasiparticle correction is made. Non-dispersive regions are shown to include a dispersive component under the quasiparticle correction. The quasiparticle weights are k-dependent and greater towards the Γ point. Non-linear analytical modelling of the quasiparticle correction is shown to be complex.
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Affiliation(s)
- I G Shuttleworth
- School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
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Anniyev T, Ogasawara H, Ljungberg MP, Wikfeldt KT, MacNaughton JB, Näslund LÅ, Bergmann U, Koh S, Strasser P, Pettersson LG, Nilsson A. Complementarity between high-energy photoelectron and L-edge spectroscopy for probing the electronic structure of 5d transition metal catalysts. Phys Chem Chem Phys 2010; 12:5694-700. [DOI: 10.1039/b926414k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Che X, Li J, Dai Y, Liu B. Structural stability and magnetism of metastable Ni-Pt intermetallic compounds studied by ab initio calculation. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11431-009-0167-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Chen X, Chu W, Cai Q, Xia D, Wu Z, Wu Z. Electronic structure of nanoscale Cu/Pt alloys: A combined X-ray diffraction and X-ray absorption investigations. Radiat Phys Chem Oxf Engl 1993 2006. [DOI: 10.1016/j.radphyschem.2005.11.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Molodtsov SL, Halilov SV, Servedio VD, Schneider W, Danzenbächer S, Hinarejos JJ, Richter M, Laubschat C. Cooper minima in the photoemission spectra of solids. PHYSICAL REVIEW LETTERS 2000; 85:4184-4187. [PMID: 11056655 DOI: 10.1103/physrevlett.85.4184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2000] [Indexed: 05/23/2023]
Abstract
Variations of the photoionization cross section of valence states as a function of interatomic distance are studied by means of atomic and solid-state density functional approaches and compared with photoemission data. In contrast to the free atom case, a series of Cooper minima is found for 4d, 5d, and 5f states in Pd, Ag, Au, and U metals. The discovered fundamental phenomenon is of high importance for the correct interpretation of photoemission data.
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Affiliation(s)
- S L Molodtsov
- Institut für Oberflächenphysik und Mikrostrukturphysik, TU Dresden, D-01062 Dresden, Germany
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