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Smirnov MY, Kalinkin AV, Simonov PA, Bukhtiyarov VI. An XPS Study of the Interaction of NO2 with Sibunit in the Presence of Supported Palladium Particles. KINETICS AND CATALYSIS 2022. [DOI: 10.1134/s0023158422050111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Smirnov MY, Kalinkin AV, Sorokin AM, Bukhtiyarov VI. Room Temperature Interaction of NO2 with Palladium Nanoparticles Supported on a Nonactivated Surface of Highly Oriented Pyrolytic Graphite (HOPG). KINETICS AND CATALYSIS 2020. [DOI: 10.1134/s0023158420060142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Brandiele R, Zerbetto M, Dalconi MC, Rizzi GA, Isse AA, Durante C, Gennaro A. Mesoporous Carbon with Different Density of Thiophenic-Like Functional Groups and Their Effect on Oxygen Reduction. CHEMSUSCHEM 2019; 12:4229-4239. [PMID: 31309717 DOI: 10.1002/cssc.201901568] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/15/2019] [Indexed: 06/10/2023]
Abstract
The metal-support interactions between sulfur-doped carbon supports (SMCs) and Pt nanoparticles (NPs) were investigated, aiming at verifying how sulfur functional groups can improve the electrocatalytic performance of Pt NPs towards the oxygen reduction reaction (ORR). SMCs were synthetized, tailoring the density of sulfur functional groups, and Pt NPs were deposited by thermal reduction of Pt(acac)2 . The extent of the metal-support interaction was proved by X-ray photoelectron spectroscopy (XPS) analysis, which revealed a strong electronic interaction, proportional to the density of sulfur defects, whereas XRD spectra provided evidence of higher strain in Pt NPs loaded on SMC. DFT simulations confirmed that the metal-support interaction was strongest in the presence of a high density of sulfur defects. The combination of microstrain and electronic effects resulted in a high catalytic activity of supported Pt NPs towards ORR, with linear correlations of the half-wave potential E1/2 or the kinetic current jk with the sulfur content in the support. Furthermore, a mass activity value (550 A g-1 ) well above the United States Department of Energy target of 440 A g-1 at 0.9 V (vs. reversible hydrogen electrode, RHE), was determined.
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Affiliation(s)
- Riccardo Brandiele
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Mirco Zerbetto
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Maria Chiara Dalconi
- Department of Geoscience, University of Padova, via Gradenigo 6, 35131, Padova, Italy
| | - Gian Andrea Rizzi
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Abdirisak Ahmed Isse
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Christian Durante
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Armando Gennaro
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
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Smirnov MY, Vovk EI, Nartova AV, Kalinkin AV, Bukhtiyarov VI. An XPS and STM Study of Oxidized Platinum Particles Formed by the Interaction between Pt/HOPG with NO2. KINETICS AND CATALYSIS 2018. [DOI: 10.1134/s0023158418050129] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Shan J, Zhang S, Choksi T, Nguyen L, Bonifacio CS, Li Y, Zhu W, Tang Y, Zhang Y, Yang JC, Greeley J, Frenkel AI, Tao F. Tuning Catalytic Performance through a Single or Sequential Post-Synthesis Reaction(s) in a Gas Phase. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02054] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Junjun Shan
- Department
of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Shiran Zhang
- Department
of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Tej Choksi
- Department
of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Luan Nguyen
- Department
of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Cecile S. Bonifacio
- Department
of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Yuanyuan Li
- Department
of Physics, Yeshiva University, New York, New York 10016, United States
| | - Wei Zhu
- Department
of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
- College
of Chemistry, Peking University, Beijing 10080, China
| | - Yu Tang
- Department
of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Yawen Zhang
- College
of Chemistry, Peking University, Beijing 10080, China
| | - Judith C. Yang
- Department
of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Jeffrey Greeley
- Department
of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Anatoly I. Frenkel
- Department
of Physics, Yeshiva University, New York, New York 10016, United States
| | - Franklin Tao
- Department
of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
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Ahmadi M, Cui C, Mistry H, Strasser P, Cuenya BR. Carbon Monoxide-Induced Stability and Atomic Segregation Phenomena in Shape-Selected Octahedral PtNi Nanoparticles. ACS NANO 2015; 9:10686-10694. [PMID: 26418831 DOI: 10.1021/acsnano.5b01807] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The chemical and morphological stability of size- and shape-selected octahedral PtNi nanoparticles (NP) were investigated after different annealing treatments up to a maximum temperature of 700 °C in a vacuum and under 1 bar of CO. Atomic force microscopy was used to examine the mobility of the NPs and their stability against coarsening, and X-ray photoelectron spectroscopy to study the surface composition, chemical state of Pt and Ni in the NPs, and thermally and CO-induced atomic segregation trends. Exposing the samples to 1 bar of CO at room temperature before annealing in a vacuum was found to be effective at enhancing the stability of the NPs against coarsening. In contrast, significant coarsening was observed when the sample was annealed in 1 bar of CO, most likely as a result of Ni(CO)4 formation and their enhanced mobility on the support surface. Sample exposure to CO at room temperature prior to annealing led to the segregation of Pt to the NP surface. Nevertheless, oxidic PtOx and NiOx species still remained at the NP surface, and, irrespective of the initial sample pretreatment, Ni surface segregation was observed upon annealing in a vacuum at moderate temperature (T < 300 °C). Interestingly, a distinct atomic segregation trend was detected between 300 and 500 °C for the sample pre-exposed to CO; namely, Ni surface segregation was partially hindered. This might be attributed to the higher bonding energy of CO to Pt as compared to Ni. Annealing in the presence of 1 bar CO also resulted in the initial surface segregation of Ni (T < 400 °C) as long as PtOx and NiOx species were available on the surface as a result of the higher affinity of Ni for oxygen. Above 500 °C, and regardless of the sample pretreatment, the diffusion of Pt atoms to the NP surface and the formation of a Ni-Pt alloy are observed.
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Affiliation(s)
- Mahdi Ahmadi
- Department of Physics, University of Central Florida , Orlando, Florida 32816, United States
| | - Chunhua Cui
- Department of Chemistry, Chemical Engineering Division, Technical University Berlin , Berlin, Germany
| | - Hemma Mistry
- Department of Physics, University of Central Florida , Orlando, Florida 32816, United States
- Department of Physics, Ruhr-University Bochum , 44780 Bochum, 10623 Berlin, Germany
| | - Peter Strasser
- Department of Chemistry, Chemical Engineering Division, Technical University Berlin , Berlin, Germany
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Svintsitskiy DA, Kibis LS, Stadnichenko AI, Koscheev SV, Zaikovskii VI, Boronin AI. Highly Oxidized Platinum Nanoparticles Prepared through Radio-Frequency Sputtering: Thermal Stability and Reaction Probability towards CO. Chemphyschem 2015; 16:3318-24. [DOI: 10.1002/cphc.201500546] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Dmitry A. Svintsitskiy
- Boreskov Institute of Catalysis; Pr. Lavrentieva 5 Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova St. 2 Novosibirsk 630090 Russia
| | - Lidiya S. Kibis
- Boreskov Institute of Catalysis; Pr. Lavrentieva 5 Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova St. 2 Novosibirsk 630090 Russia
| | - Andrey I. Stadnichenko
- Boreskov Institute of Catalysis; Pr. Lavrentieva 5 Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova St. 2 Novosibirsk 630090 Russia
| | - Sergei V. Koscheev
- Boreskov Institute of Catalysis; Pr. Lavrentieva 5 Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova St. 2 Novosibirsk 630090 Russia
| | - Vladimir I. Zaikovskii
- Boreskov Institute of Catalysis; Pr. Lavrentieva 5 Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova St. 2 Novosibirsk 630090 Russia
| | - Andrei I. Boronin
- Boreskov Institute of Catalysis; Pr. Lavrentieva 5 Novosibirsk 630090 Russia
- Novosibirsk State University; Pirogova St. 2 Novosibirsk 630090 Russia
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Toyoshima R, Kondoh H. In-situ observations of catalytic surface reactions with soft x-rays under working conditions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:083003. [PMID: 25667354 DOI: 10.1088/0953-8984/27/8/083003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Catalytic chemical reactions proceeding on solid surfaces are an important topic in fundamental science and industrial technologies such as energy conversion, pollution control and chemical synthesis. Complete understanding of the heterogeneous catalysis and improving its efficiency to an ultimate level are the eventual goals for many surface scientists. Soft x-ray is one of the prime probes to observe electronic and structural information of the target materials. Most studies in surface science using soft x-rays have been performed under ultra-high vacuum conditions due to the technical limitation, though the practical catalytic reactions proceed under ambient pressure conditions. However, recent developments of soft x-ray based techniques operating under ambient pressure conditions have opened a door to the in-situ observation of materials under realistic environments. The near-ambient-pressure x-ray photoelectron spectroscopy (NAP-XPS) using synchrotron radiation enables us to observe the chemical states of surfaces of condensed matters under the presence of gas(es) at elevated pressures, which has been hardly conducted with the conventional XPS technique. Furthermore, not only the NAP-XPS but also ambient-pressure compatible soft x-ray core-level spectroscopies, such as near-edge absorption fine structure (NEXAFS) and x-ray emission spectroscopy (XES), have been significantly contributing to the in-situ observations. In this review, first we introduce recent developments of in-situ observations using soft x-ray techniques and current status. Then we present recent new findings on catalytically active surfaces using soft x-ray techniques, particularly focusing on the NAP-XPS technique. Finally we give a perspective on the future direction of this emerging technique.
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Ahmadi M, Behafarid F, Cui C, Strasser P, Cuenya BR. Long-range segregation phenomena in shape-selected bimetallic nanoparticles: chemical state effects. ACS NANO 2013; 7:9195-9204. [PMID: 24015721 DOI: 10.1021/nn403793a] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A study of the morphological and chemical stability of shape-selected octahedral Pt0.5Ni0.5 nanoparticles (NPs) supported on highly oriented pyrolytic graphite (HOPG) is presented. Ex situ atomic force microscopy (AFM) and in situ X-ray photoelectron spectroscopy (XPS) measurements were used to monitor the mobility of Pt0.5Ni0.5 NPs and to study long-range atomic segregation and alloy formation phenomena under vacuum, H2, and O2 environments. The chemical state of the NPs was found to play a pivotal role in their surface composition after different thermal treatments. In particular, for these ex situ synthesized NPs, Ni segregation to the NP surface was observed in all environments as long as PtOx species were present. In the presence of oxygen, an enhanced Ni surface segregation was observed at all temperatures. In contrast, in hydrogen and vacuum, the Ni outward segregation occurs only at low temperature (<200-270 °C), while PtOx species are still present. At higher temperatures, the reduction of the Pt oxide species results in Pt diffusion toward the NP surface and the formation of a Ni-Pt alloy. A consistent correlation between the NP surface composition and its electrocatalytic CO oxidation activity was established.
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Affiliation(s)
- Mahdi Ahmadi
- Department of Physics, University of Central Florida , Orlando, Florida 32816, United States
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International Scientific and Technological Cooperation Award der Volksrepublik China: R. N. Zare und F. Besenbacher / Eugene J. Houdry Award: G. Bellussi / Paul H. Emmett Award: C. W. Jones / Preise beim International Symposium on Macrocyclic and Supramol. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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International Scientific and Technological Cooperation Award of the People's Republic of China: R. N. Zare and F. Besenbacher / Eugene J. Houdry Award: G. Bellussi / Paul H. Emmett Award: C. W. Jones / Awards at the International Symposium on Macrocyclic. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/anie.201304635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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