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Fang Y, Hu R, Ding SY, Tian ZQ. A quantitative simulation method for electrochemical infrared and Raman spectroscopies of single-crystal metal electrodes. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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2
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Panikkanvalappil SR, Garlapati C, Hooshmand N, Aneja R, El-Sayed MA. Monitoring the dynamics of hemeoxygenase-1 activation in head and neck cancer cells in real-time using plasmonically enhanced Raman spectroscopy. Chem Sci 2019; 10:4876-4882. [PMID: 31183038 PMCID: PMC6520930 DOI: 10.1039/c9sc00093c] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 03/21/2019] [Indexed: 12/13/2022] Open
Abstract
Real-time monitoring of the dynamics of pharmacologically generated HO-1 in mammalian cells by using plasmonically enhanced Raman spectroscopy (PERS).
We report for the first time the usage of plasmonically enhanced Raman spectroscopy (PERS) to directly monitor the dynamics of pharmacologically generated hemeoxygenase-1 (HO-1) by evaluating the kinetics of formation of carbon monoxide (CO), one of the metabolites of HO-1 activation, in live cells during cisplatin treatment. Being an endogenous signaling molecule, CO plays an important role in cancer regression. Many aspects of HO-1's and CO's functions in biology are still unclear largely due to the lack of technological tools for the real-time monitoring of their dynamics in live cells and tissues. In this study, we found that, together with nuclear region-targeted gold nanocubes (AuNCs), cisplatin treatment can dramatically trigger the activation of HO-1 and thereby the rate and production of CO in mammalian cells in a dose-dependent manner. Though quantitative molecular data revealed that a lower concentration of cisplatin up-regulates HO-1 expression in cancer cells, PERS data suggest that it poorly facilitates the activation of HO-1 and thereby the production of CO. However, at a higher dose, cisplatin along with AuNCs could significantly enhance the activation of HO-1 in cancer cells, which could be probed in real-time by monitoring the CO generation by using PERS. Under the same conditions, the rate of formation of CO in healthy cells was relatively higher in comparison to the cancer cells. Additionally, molecular data revealed that AuNCs have the potential to suppress the up-regulation of HO-1 in cancer cells during cisplatin treatment at a lower concentration. As up-regulation of HO-1 has a significant role in cell adaptation to oxidative stress in cancer cells, the ability of AuNCs in suppressing the HO-1 overexpression will have a remarkable impact in the development of nanoformulations for combination cancer therapy. This exploratory study demonstrates the unique possibilities of PERS in the real-time monitoring of endogenously generated CO and thereby the dynamics of HO-1 in live cells, which could expedite our understanding of the signaling action of CO and HO-1 in cancer progression.
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Affiliation(s)
- Sajanlal R Panikkanvalappil
- Laser Dynamics Laboratory , School of Chemistry and Biochemistry , Georgia Institute of Technology , Atlanta , Georgia 30332 , USA .
| | | | - Nasrin Hooshmand
- Laser Dynamics Laboratory , School of Chemistry and Biochemistry , Georgia Institute of Technology , Atlanta , Georgia 30332 , USA .
| | - Ritu Aneja
- Georgia State University , Department of Biology , Atlanta , GA , USA
| | - Mostafa A El-Sayed
- Laser Dynamics Laboratory , School of Chemistry and Biochemistry , Georgia Institute of Technology , Atlanta , Georgia 30332 , USA .
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Sun Y, Zhou Y, Zhu C, Hu L, Han M, Wang A, Huang H, Liu Y, Kang Z. A Pt-Co 3O 4-CD electrocatalyst with enhanced electrocatalytic performance and resistance to CO poisoning achieved by carbon dots and Co 3O 4 for direct methanol fuel cells. NANOSCALE 2017; 9:5467-5474. [PMID: 28426049 DOI: 10.1039/c7nr01727h] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Highly efficient electrocatalysts remain huge challenges in direct methanol fuel cells (DMFCs). Here, a Pt-Co3O4-CDs/C composite was fabricated as an anode electrocatalyst with low Pt content (12 wt%) by using carbon dots (CDs) and Co3O4 nanoparticles as building blocks. The Pt-Co3O4-CDs/C composite catalyst shows a significantly enhanced electrocatalytic activity (1393.3 mA mg-1 Pt), durability (over 4000 s) and CO-poisoning tolerance. The superior catalytic activity should be attributed to the synergistic effect of CDs, Pt and Co3O4. Furthermore, the Pt-Co3O4-CDs/C catalyst was integrated into a single cell, which exhibits a maximum power density of 45.6 mW cm-2, 1.7 times the cell based on the commercial 20 wt% Pt/C catalyst.
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Affiliation(s)
- Yue Sun
- Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, China.
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In Situ FTIR Analysis of CO-Tolerance of a Pt-Fe Alloy with Stabilized Pt Skin Layers as a Hydrogen Anode Catalyst for Polymer Electrolyte Fuel Cells. Catalysts 2016. [DOI: 10.3390/catal7010008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Raymundo-Pereira PA, Shimizu FM, Coelho D, Piazzeta MH, Gobbi AL, Machado SA, Oliveira ON. A Nanostructured Bifunctional platform for Sensing of Glucose Biomarker in Artificial Saliva: Synergy in hybrid Pt/Au surfaces. Biosens Bioelectron 2016; 86:369-376. [DOI: 10.1016/j.bios.2016.06.053] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 06/10/2016] [Accepted: 06/18/2016] [Indexed: 12/17/2022]
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Lee S, Cho J, Jang JH, Han J, Yoon SP, Nam SW, Lim TH, Ham HC. Impact of d-Band Occupancy and Lattice Contraction on Selective Hydrogen Production from Formic Acid in the Bimetallic Pd3M (M = Early Transition 3d Metals) Catalysts. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01691] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sangheon Lee
- Fuel
Cell Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Jinwon Cho
- Fuel
Cell Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
- Green
School (Graduate School of Energy and Environment), Korea University, 145,
Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea
| | - Jong Hyun Jang
- Fuel
Cell Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Jonghee Han
- Fuel
Cell Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
- Green
School (Graduate School of Energy and Environment), Korea University, 145,
Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea
| | - Sung Pil Yoon
- Fuel
Cell Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Suk Woo Nam
- Fuel
Cell Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
- Green
School (Graduate School of Energy and Environment), Korea University, 145,
Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea
| | - Tae Hoon Lim
- Fuel
Cell Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Hyung Chul Ham
- Fuel
Cell Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
- Clean
Energy and Chemical Engineering, University of Science and Technology (UST), 217 Gajungro, Yuseong-gu, Daejeon, 305-333, Republic of Korea
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Toward atomically-precise synthesis of supported bimetallic nanoparticles using atomic layer deposition. Nat Commun 2015; 5:3264. [PMID: 24513581 DOI: 10.1038/ncomms4264] [Citation(s) in RCA: 102] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 01/15/2014] [Indexed: 01/30/2023] Open
Abstract
Multi-metallic nanoparticles constitute a new class of materials offering the opportunity to tune the properties via the composition, atomic ordering and size. In particular, supported bimetallic nanoparticles have generated intense interest in catalysis and electrocatalysis. However, traditional synthesis methods often lack precise control, yielding a mixture of monometallic and bimetallic particles with various compositions. Here we report a general strategy for synthesizing supported bimetallic nanoparticles by atomic layer deposition, where monometallic nanoparticle formation is avoided by selectively growing the secondary metal on the primary metal nanoparticle but not on the support; meanwhile, the size, composition and structure of the bimetallic nanoparticles are precisely controlled by tailoring the precursor pulse sequence. Such exquisite control is clearly demonstrated through in situ Fourier transform infrared spectroscopy of CO chemisorption by mapping the gradual atomic-scale evolution in the surface composition, and further confirmed using aberration-corrected scanning transmission electron microscopy.
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Promoting performance and CO tolerance of Pt nanocatalyst for direct methanol fuel cells by supporting on high-surface-area silicon carbide. J Solid State Electrochem 2013. [DOI: 10.1007/s10008-013-2336-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Liu Z, Ma L, Zhang J, Hongsirikarn K, Goodwin JG. Pt Alloy Electrocatalysts for Proton Exchange Membrane Fuel Cells: A Review. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2013. [DOI: 10.1080/01614940.2013.795455] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Bi YS, Dang GY, Zhao XH, Meng XF, Lu HJ, Jin JT. Preparation, characterization and catalytic properties of Pd-Fe-zeolite and Pd-Ce-zeolite composite catalysts. JOURNAL OF HAZARDOUS MATERIALS 2012; 229-230:245-250. [PMID: 22727393 DOI: 10.1016/j.jhazmat.2012.05.101] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 05/29/2012] [Accepted: 05/30/2012] [Indexed: 06/01/2023]
Abstract
Highly effective composite catalysts for removal of CO by catalytic oxidation have been designed through constructing active centers on the support of zeolite. Performances of the derived Pd-Fe-zeolite and Pd-Ce-zeolite composite catalysts for CO removal under different heterogeneous conditions were studied. The results indicate that the two kinds of promoted catalysts, including special chemical states of Pd and surface active oxygen, show high catalytic activities not only for the low temperature oxidation of CO, but also for CO electro-oxidation. The typical light-off temperatures of Pd-Fe-zeolite and Pd-Ce-zeolite for low temperature CO oxidation are 270 and 273 K. Their characteristic peak potentials for CO electro-oxidation are both around 0.70 V. The promotional effects are associated with the special interaction among Pd, modifier and zeolite, which can be firmly supported by the detailed characterizations using XRD, BET, XPS, TPD and TPR.
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Affiliation(s)
- Yu-Shui Bi
- Chemical Engineering Department, Taishan Medical University, Tai-an 271016, PR China.
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12
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Ataee-Esfahani H, Nemoto Y, Imura M, Yamauchi Y. Facile Synthesis of Nanoporous Pt-Ru Alloy Spheres with Various Compositions toward Highly Active Electrocatalysts. Chem Asian J 2012; 7:876-80. [DOI: 10.1002/asia.201200053] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Indexed: 11/09/2022]
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13
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Sato T, Okaya K, Kunimatsu K, Yano H, Watanabe M, Uchida H. Effect of Particle Size and Composition on CO-Tolerance at Pt–Ru/C Catalysts Analyzed by In Situ Attenuated Total Reflection FTIR Spectroscopy. ACS Catal 2012. [DOI: 10.1021/cs200550t] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takako Sato
- Interdisciplinary
Graduate School of Medicine and Engineering, ‡Fuel Cell Nanomaterials Center, and §Clean Energy Research
Center, University of Yamanashi, Takeda 4, Kofu, 400-8510, Japan
| | - Kazuki Okaya
- Interdisciplinary
Graduate School of Medicine and Engineering, ‡Fuel Cell Nanomaterials Center, and §Clean Energy Research
Center, University of Yamanashi, Takeda 4, Kofu, 400-8510, Japan
| | - Keiji Kunimatsu
- Interdisciplinary
Graduate School of Medicine and Engineering, ‡Fuel Cell Nanomaterials Center, and §Clean Energy Research
Center, University of Yamanashi, Takeda 4, Kofu, 400-8510, Japan
| | - Hiroshi Yano
- Interdisciplinary
Graduate School of Medicine and Engineering, ‡Fuel Cell Nanomaterials Center, and §Clean Energy Research
Center, University of Yamanashi, Takeda 4, Kofu, 400-8510, Japan
| | - Masahiro Watanabe
- Interdisciplinary
Graduate School of Medicine and Engineering, ‡Fuel Cell Nanomaterials Center, and §Clean Energy Research
Center, University of Yamanashi, Takeda 4, Kofu, 400-8510, Japan
| | - Hiroyuki Uchida
- Interdisciplinary
Graduate School of Medicine and Engineering, ‡Fuel Cell Nanomaterials Center, and §Clean Energy Research
Center, University of Yamanashi, Takeda 4, Kofu, 400-8510, Japan
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Poh CK, Tian Z, Gao J, Liu Z, Lin J, Feng YP, Su F. Nanostructured trimetallic Pt/FeRuC, Pt/NiRuC, and Pt/CoRuC catalysts for methanol electrooxidation. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31956j] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Cui ZM, Jiang SP, Li CM. Highly dispersed MoOx on carbon nanotube as support for high performance Pt catalyst towards methanol oxidation. Chem Commun (Camb) 2011; 47:8418-20. [DOI: 10.1039/c1cc12420j] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Interactions between interfacial water and CO adsorbed on Pt and Pt–Ru alloy surfaces under electrochemical conditions: Density-functional theory study. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.09.074] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Peng B, Yan YG, Cai WB. Surface-enhanced IR spectroscopy investigation on the electro-oxidation of CO adlayer at a polycrystalline Pt film electrode in Cl−-containing HClO4. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.04.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Jeon TY, Lee KS, Yoo SJ, Cho YH, Kang SH, Sung YE. Effect of surface segregation on the methanol oxidation reaction in carbon-supported Pt-Ru alloy nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:9123-9129. [PMID: 20377220 DOI: 10.1021/la9049154] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Ru and Pt-Ru (Pt:Ru = 1:1) nanoparticles supported on carbon black were prepared by the borohydride reduction method using oleylamine as a stabilizer in an anhydrous ethanol solvent. We investigated the effect of Pt segregation to the surface of alloy nanoparticles on the methanol oxidation reaction (MOR). As-prepared Pt(1)Ru(1)/C showed a narrow size distribution and a relatively uniform particle distribution on a carbon support. However, its electrocatalytic activity toward the MOR was poor due to the high surface concentration of Ru. As duration time of heat treatment at 200 degrees C was increased up to 2 h, the surface composition of Pt atoms was increased without significant particle growth due to thermally induced segregation of Pt atoms, which were revealed by TEM images, X-ray photoelectron spectroscopy (XPS) analysis, changes in the potentials of zero total charge (pztc), and increase in the oxidation charge of "reduced CO(2)". In particular, from the combination of CO adlayer oxidation and "reduced CO(2)" oxidation charges, the increased surface concentration of Pt of alloy catalysts was relatively quantified when compared to its as-prepared state. Cyclic voltammograms in 0.1 M HClO(4) solution with 0.5 M methanol showed that Pt(1)Ru(1)/C annealed for 2 h at 200 degrees C in a flow of mixture gas of Ar and H(2) (5 vol %) had a less positive onset potential for the MOR. These results demonstrate a definitive contribution from segregation of Pt atoms to the MOR activity.
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Affiliation(s)
- Tae-Yeol Jeon
- School of Chemical & Biological Engineering and Research Center for Energy Conversion & Storage, Seoul National University, Seoul 151-744, South Korea
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19
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Huo SJ, Wang JY, Yao JL, Cai WB. Exploring Electrosorption at Iron Electrode with in Situ Surface-Enhanced Infrared Absorption Spectroscopy. Anal Chem 2010; 82:5117-24. [DOI: 10.1021/ac1002323] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sheng-Juan Huo
- Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry, Fudan University, Shanghai 200433, China, and Department of Chemistry, Suzhou University, Suzhou 215123, China
| | - Jin-Yi Wang
- Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry, Fudan University, Shanghai 200433, China, and Department of Chemistry, Suzhou University, Suzhou 215123, China
| | - Jian-Lin Yao
- Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry, Fudan University, Shanghai 200433, China, and Department of Chemistry, Suzhou University, Suzhou 215123, China
| | - Wen-Bin Cai
- Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry, Fudan University, Shanghai 200433, China, and Department of Chemistry, Suzhou University, Suzhou 215123, China
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20
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Park YK, Kim TH, Park S. Designer composite materials fabricated from platinum and ruthenium nanoparticles. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b921528j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Nakamura M, Hanioka Y, Ouchida W, Yamada M, Hoshi N. Estimation of Surface Structure and Carbon Monoxide Oxidation Site of Shape-Controlled Pt Nanoparticles. Chemphyschem 2009; 10:2719-24. [DOI: 10.1002/cphc.200900486] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Platinum Films with Controlled 3-Dimensional Nanoscopic Morphologies and Their Effects on Surface Enhanced Raman Scattering. Chem Asian J 2009; 4:1284-8. [DOI: 10.1002/asia.200900109] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Ren B, Lian XB, Li JF, Fang PP, Lai QP, Tian ZQ. Spectroelectrochemical flow cell with temperature control for investigation of electrocatalytic systems with surface-enhanced Raman spectroscopy. Faraday Discuss 2009; 140:155-65; discussion 185-207. [DOI: 10.1039/b803366h] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Ding Y, Jin B, Gu G, Xia XH. One-step pyrolysis method for the synthesis of highly efficient 3D hollow carbon nanostructure supported metallic catalysts. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b913767j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cui Z, Liu C, Liao J, Xing W. Highly active PtRu catalysts supported on carbon nanotubes prepared by modified impregnation method for methanol electro-oxidation. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2008.05.003] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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28
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Temperature dependence of co-adsorption of carbon monoxide and water on highly dispersed Pt/C and PtRu/C electrodes studied by in-situ ATR-FTIRAS. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2008.02.023] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Electrocatalytic applications of a vertical Au nanorod array using ultrathin Pt/Ru/Pt layer-by-layer coatings. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2007.12.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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30
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Korzeniewski C. Recent Advances in in‐situ Infrared Spectroscopy and Applications in Single‐Crystal Electrochemistry and Electrocatalysis. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/9783527616817.ch7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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31
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32
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Effect of the structure of Pt–Ru/C particles on COad monolayer vibrational properties and electrooxidation kinetics. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.07.061] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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33
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Sato T, Kunimatsu K, Uchida H, Watanabe M. Adsorption/oxidation of CO on highly dispersed Pt catalyst studied by combined electrochemical and ATR-FTIRAS methods. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.05.007] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Islam M, Basnayake R, Korzeniewski C. A study of formaldehyde formation during methanol oxidation over PtRu bulk alloys and nanometer scale catalyst. J Electroanal Chem (Lausanne) 2007. [DOI: 10.1016/j.jelechem.2006.08.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Basnayake R, Li Z, Katar S, Zhou W, Rivera H, Smotkin ES, Casadonte DJ, Korzeniewski C. PtRu nanoparticle electrocatalyst with bulk alloy properties prepared through a sonochemical method. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:10446-50. [PMID: 17129014 DOI: 10.1021/la061274o] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Properties of PtRu nanoparticles prepared using high-intensity sonochemistry are reported. Syntheses were carried out in tetrahydrofuran (THF) containing Ru3+ and Pt4+ in a fixed mole ratio of either 1:10 or 1:1. X-ray diffraction measurements confirmed sonocation produces an alloy phase and showed that the composition of the nanometer scale metal particles is close to the mole fraction of Ru3+ and Pt4+ in solution with deviations that tend toward Ru enrichment in the alloy phase. The materials gave responses that are similar in terms of peak potential and current density, referenced to the catalyst active surface area, to those of bulk alloys in voltammetry experiments involving CO stripping and CH3OH electrochemical oxidation in 0.1 M H2SO4. The results show that sonochemical methods have the potential to produce nanometer scale bimetallic electrocatalysts that possess alloy properties. The materials have application in mechanistic studies of fuel cell reactions and as platforms for the development of CO tolerant fuel cell catalyst.
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Affiliation(s)
- Rukma Basnayake
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
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Chen H, Wang Y, Dong S, Wang E. An approach for fabricating self-assembled monolayer of Ag nanoparticles on gold as the SERS-active substrate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 64:343-8. [PMID: 16384736 DOI: 10.1016/j.saa.2005.07.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2005] [Revised: 07/10/2005] [Accepted: 07/14/2005] [Indexed: 05/05/2023]
Abstract
In this paper, an approach for fabricating an active surface-enhanced Raman scattering (SERS) substrate is adopted. This approach is based on the assembling of silver nanoparticles film on gold substrate. Rhodamine 6G (R6G) and p-aminothiophenol (p-ATP) were used as probe molecules for SERS experiments, showing that this new active substrate has sensitivity to SERS response. Tapping-mode atomic force microscopy (AFM) was also used to investigate the surface morphology following the fabricating process of the active SERS substrate, which showed that large quantities of silver nanoparticles were uniformly coated on the substrate.
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Affiliation(s)
- Hongjun Chen
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renming Street 5625, Changchun, Jilin 130022, PR China
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Nakashima T, Nohara S, Inoue H, Iwakura C. A new simple preparation of platinum-nickel alloy nanoparticles and their characterization as an electrocatalyst for methanol oxidation. RESEARCH ON CHEMICAL INTERMEDIATES 2006. [DOI: 10.1163/156856706777973754] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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39
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Huo SJ, Xue XK, Yan YG, Li QX, Ma M, Cai WB, Xu QJ, Osawa M. Extending in Situ Attenuated-Total-Reflection Surface-Enhanced Infrared Absorption Spectroscopy to Ni Electrodes. J Phys Chem B 2006; 110:4162-9. [PMID: 16509710 DOI: 10.1021/jp0566966] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Surface-enhanced infrared absorption spectroscopy (SEIRAS) in the attenuated-total-reflection configuration (ATR-SEIRAS) has been applied for the first time to Ni electrodes. SEIRA-active Ni electrodes were obtained through initial chemical deposition of a 60-nm-thick Au underlayer on the reflecting plane of an ATR Si prism followed by potentiostatic electrodeposition of a 40-nm-thick Ni overlayer in a modified Watt's electrolyte. The Ni nanoparticle film thus obtained exhibited exceptionally enhanced IR absorption for the surface probe molecule CO while maintaining unipolar and normally directed bands. With the advantages of ATR-SEIRAS, free H2O molecules coadsorbed with CO at the Ni electrode were revealed, and their role in the electrooxidation of the CO adlayer at the Ni electrode is discussed. In addition, the conversion of bridge to linearly bonded CO at Ni electrode in a neutral solution was clearly identified upon electrooxidation of the CO adlayer. ATR-SEIRAS was also used to characterize the adsorption configuration of a pyridine adlayer at the Ni electrode. Both A1 and B1 modes of adsorbed pyridine were detected with comparably large intensities, essentially maintaining the spectral feature of pyridine molecules rather than that of "alpha-pyridyl species", which strongly suggests an "edge-tilted pyridine" configuration present at the Ni electrode, a configuration intermediate between the "end-on pyridine" and "edge-on alpha-pyridyl" adsorption modes reported in the literature.
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Affiliation(s)
- Sheng-Juan Huo
- Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry, Fudan University, Shanghai 200433, China
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Maillard F, Lu GQ, Wieckowski A, Stimming U. Ru-Decorated Pt Surfaces as Model Fuel Cell Electrocatalysts for CO Electrooxidation. J Phys Chem B 2005; 109:16230-43. [PMID: 16853064 DOI: 10.1021/jp052277x] [Citation(s) in RCA: 221] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This feature article concerns Pt surfaces modified (decorated) by ruthenium as model fuel cell electrocatalysts for electrooxidation processes. This work reveals the role of ruthenium promoters in enhancing electrocatalytic activity toward organic fuels for fuel cells, and it particularly concerns the methanol decomposition product, surface CO. A special focus is on surface mobility of the CO as it is catalytically oxidized to CO(2). Different methods used to prepare Ru-decorated Pt single crystal surfaces as well as Ru-decorated Pt nanoparticles are reviewed, and the methods of characterization and testing of their activity are discussed. The focus is on the origin of peak splitting involved in the voltammetric electrooxidation of CO on Ru-decorated Pt surfaces, and on the interpretative consequences of the splitting for single crystal and nanoparticle Pt/Ru bimetallic surfaces. Apparently, screening through the literature allows formulating several models of the CO stripping reaction, and the validity of these models is discussed. Major efforts are made in this article to compare the results reported by the Urbana-Champaign group and the Munich group, but also by other groups. As electrocatalysis is progressively more and more driven by theory, our review of the experimental findings may serve to summarize the state of the art and clarify the roads ahead. Future studies will deal with highly dispersed and reactive nanoscale surfaces and other more advanced catalytic materials for fuel cell catalysis and related energy applications. It is expected that the metal/metal and metal/substrate interactions will be increasingly investigated on atomic and electronic levels, with likewise increasing participation of theory, and the structure and reactivity of various monolayer catalytic systems involving more than two metals (that is ternary and quaternary systems) will be interrogated.
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Affiliation(s)
- F Maillard
- Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces, UMR CNRS 5631, ENSEEG, BP75, 38402 Saint Martin d'Hères, France
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Huo SJ, Li QX, Yan YG, Chen Y, Cai WB, Xu QJ, Osawa M. Tunable Surface-Enhanced Infrared Absorption on Au Nanofilms on Si Fabricated by Self-Assembly and Growth of Colloidal Particles. J Phys Chem B 2005; 109:15985-91. [PMID: 16853028 DOI: 10.1021/jp052585v] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Au colloids were used to fabricate nanoscale-tunable Au nanofilms on silicon for surface-enhanced IR absorption bases in both ambient and electrochemical environments. This wet process incorporates the self-assembly of colloidal Au monolayer using 3-aminopropyl trimethoxysilane as the organic coupler with subsequent chemical plating in an Au(III)/hydroxylamine solution. FTIR spectroscopy in transmission mode of the probe species SCN- was used to evaluate the apparent surface enhancement in IR absorption of 2D Au colloid arrays and chemically plated Au particles. The nanostructure of Au films was examined by atomic force microscopy. The IR and AFM results show that the apparent surface enhancement factor (1-2 orders of magnitude) increases with increasing sizes and/or contact, and the severe aggregation of Au nanoparticles may cause the bipolar band shape. Cyclic voltammetry on the Au nanofilm obtained by the above nucleation and growth strategy exhibits a feasible electrochemical stability and behavior. In situ ATR-FTIR measurement of p-nitrobenzoic acid adsorption demonstrates that the as-grown Au film yields rather promising surface enhancement as well.
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Affiliation(s)
- Sheng-Juan Huo
- Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry, Fudan University, Shanghai 200433, China
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Yan YG, Li QX, Huo SJ, Ma M, Cai WB, Osawa M. Ubiquitous Strategy for Probing ATR Surface-Enhanced Infrared Absorption at Platinum Group Metal−Electrolyte Interfaces. J Phys Chem B 2005; 109:7900-6. [PMID: 16851921 DOI: 10.1021/jp044085s] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A versatile two-step wet process to fabricate Pt, Pd, Rh, and Ru nanoparticle films (simplified as nanofilms hereafter) for in situ attenuated total reflection Fourier transform infrared (ATR-FTIR) study of electrochemical interfaces is presented, which incorporates an initial chemical deposition of a gold nanofilm on the basal plane of a silicon prism with the subsequent electrodepostion of desired platinum group metal overlayers. Galvanostatic electrodeposition of Pt, Rh, and Pd from phosphate or perchloric acid electrolytes, or potentiostatic electrodeposition of Ru from a sulfuric acid electrolyte, yields sufficiently "pinhole-free" overlayers as evidenced by electrochemical and spectroscopic characterizations. The Pt group metal nanofilms thus obtained exhibit strongly enhanced IR absorption. In contrast to the corresponding metal films electrochemically deposited directly on glassy carbon and bulk metal electrodes, the observed enhanced absorption for the probe molecule CO exhibits normal unipolar band shapes. Scanning tunneling microscopic (STM) images reveal that fine nanoparticles of Pt group metals are deposited around wavy and stepped bunches of Au nanoparticles of relatively large sizes. This ubiquitous strategy is expected to open a wide avenue for extending ATR surface-enhanced IR absorption spectroscopy to explore molecular adsorption and reactions on technologically important transition metals, as exemplified by successful real-time spectroscopic and electrochemical monitoring of the oxidation of CO at Pd and that of methanol at Pt nanofilm electrodes. The spectral features of free water molecules coadsorbed with CO on Pt, Pd, Rh, and Ru are also discussed.
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Affiliation(s)
- Yan-Gang Yan
- Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry, Fudan University, Shanghai 200433, China
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43
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Yee N, Chottiner GS, Scherson DA. Carbon Monoxide Adsorption on Ru-Modified Pt Surfaces: Time-Resolved Infrared Reflection Absorption Studies in Ultrahigh Vacuum. J Phys Chem B 2005; 109:5707-12. [PMID: 16851617 DOI: 10.1021/jp044641i] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The vibrational spectra of CO adsorbed on Ru-modified Pt(100) surfaces prepared by chemical vapor deposition (condensation of Ru(3)(CO)(12) at 105 K followed by X-ray irradiation and thermal decomposition at 650 K in ultrahigh vacuum, UHV) was investigated by time-resolved infrared reflection absorption spectroscopy (IRAS) in UHV. Spectra were recorded while Ru/Pt(100) bimetallic surfaces (theta(Ru) = 0.24 and 0.52 by X-ray photoelectron spectroscopy, XPS) were dosed with gas-phase CO. Analysis of the data revealed that for a wide range of calibrated CO exposures, the linear CO-stretching region displays two features: a higher energy peak (2085-2100 cm(-1)), attributed to CO adsorbed on pristine Pt(100) sites, and a lower energy peak (2066-2092 cm(-1)), ascribed to adsorption of CO on sites on the surface induced by the presence of Ru. Similar experiments were performed on bimetallic specimens annealed repeatedly in UHV to 650 K to promote partial Ru dissolution into the lattice and thus render surfaces gradually enriched in Pt. For all surfaces and CO exposures examined, the total integrated area under the two CO spectral features remained fairly constant and equal in value to the corresponding areas found for bare Pt(100). If it is assumed that a fixed exposure leads to a fixed coverage on both bare and Ru-modified Pt(100)surfaces, and the thermal treatment leads to an exchange of Ru by Pt sites without altering significantly the total number of metal sites on the surface, the absorption cross sections for both of these peaks are virtually the same.
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Affiliation(s)
- Nelson Yee
- Departments of Chemistry and Physics, Case Western Reserve University, Cleveland, OH 44106, USA
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Aricò A, Baglio V, Blasi AD, Modica E, Monforte G, Antonucci V. Electrochemical analysis of high temperature methanol electro-oxidation at Pt-decorated Ru catalysts. J Electroanal Chem (Lausanne) 2005. [DOI: 10.1016/j.jelechem.2004.10.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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45
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In situ IR reflectance absorption spectroscopy studies of the effect of Nafion on CO adsorption and electrooxidation at Pt nanoparticles. J Solid State Electrochem 2004. [DOI: 10.1007/s10008-004-0596-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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46
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Yee N, Chottiner GS, Scherson DA. CO Adsorption on Ru-Modified Pt(100) Surfaces: Infrared Reflection Absorption Studies in Ultrahigh Vacuum. J Phys Chem B 2004. [DOI: 10.1021/jp0379401] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nelson Yee
- Departments of Chemistry and Physics, Case Western Reserve University, Cleveland, Ohio 44106
| | - Gary S. Chottiner
- Departments of Chemistry and Physics, Case Western Reserve University, Cleveland, Ohio 44106
| | - Daniel A. Scherson
- Departments of Chemistry and Physics, Case Western Reserve University, Cleveland, Ohio 44106
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Lee J, Hwang S, Lee H, Kwak J. Bimetallic Clusters by Underpotential Deposition on Layered Au Nanoparticle Films. J Phys Chem B 2004. [DOI: 10.1021/jp037460+] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gao L, Huang H, Korzeniewski C. The efficiency of methanol conversion to CO2 on thin films of Pt and PtRu fuel cell catalysts. Electrochim Acta 2004. [DOI: 10.1016/j.electacta.2003.07.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Wieckowski A. Tribute to Professor Michael J. Weaver (1947–2002). J Electroanal Chem (Lausanne) 2003. [DOI: 10.1016/s0022-0728(03)00328-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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50
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Cherstiouk O, Simonov P, Zaikovskii V, Savinova E. CO monolayer oxidation at Pt nanoparticles supported on glassy carbon electrodes. J Electroanal Chem (Lausanne) 2003. [DOI: 10.1016/s0022-0728(03)00198-0] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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