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Wang Q, Chen S, Jiang J, Liu J, Deng J, Ping X, Wei Z. Manipulating the surface composition of Pt–Ru bimetallic nanoparticles to control the methanol oxidation reaction pathway. Chem Commun (Camb) 2020; 56:2419-2422. [DOI: 10.1039/c9cc09423g] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Here, we achieve surface composition by precisely manipulating bimetallic Pt–Ru alloys from Pt-skin-rich to Ru-skin-rich materials and report that the MOR pathway can be controlled by tuning the location and content of Ru on the Pt–Ru alloy surface.
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Affiliation(s)
- Qingmei Wang
- The State Key Laboratory of Power Transmission Equipment & System Security and New Technology
- Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
| | - Siguo Chen
- The State Key Laboratory of Power Transmission Equipment & System Security and New Technology
- Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
| | - Jian Jiang
- The State Key Laboratory of Fine Chemical Industry
- Dalian University of Technology
- Dalian
- China
| | - Jinxuan Liu
- The State Key Laboratory of Fine Chemical Industry
- Dalian University of Technology
- Dalian
- China
| | - Jianghai Deng
- The State Key Laboratory of Power Transmission Equipment & System Security and New Technology
- Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
| | - Xinyu Ping
- The State Key Laboratory of Power Transmission Equipment & System Security and New Technology
- Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
| | - Zidong Wei
- The State Key Laboratory of Power Transmission Equipment & System Security and New Technology
- Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
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2
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Huang-Fu ZC, Song QT, He YH, Liu XL, Wang JJ, Sun SG, Wang ZH. Surface configuration of CO adsorbed on nanostructured Pt electrodes probed using broadband sum frequency generation spectroscopy. Chem Commun (Camb) 2020; 56:9723-9726. [DOI: 10.1039/d0cc02469d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Inhomogeneity of adsorbed CO introduced by the aggregation of Pt nanoparticles.
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Affiliation(s)
- Zhi-Chao Huang-Fu
- Collaborative Innovation Center of Chemistry for Energy Materials
- State Key Laboratory for Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Qian-Tong Song
- Collaborative Innovation Center of Chemistry for Energy Materials
- State Key Laboratory for Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Yu-Han He
- Collaborative Innovation Center of Chemistry for Energy Materials
- State Key Laboratory for Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Xiao-Lin Liu
- Collaborative Innovation Center of Chemistry for Energy Materials
- State Key Laboratory for Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Jing-Jing Wang
- Collaborative Innovation Center of Chemistry for Energy Materials
- State Key Laboratory for Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Shi-Gang Sun
- Collaborative Innovation Center of Chemistry for Energy Materials
- State Key Laboratory for Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Zhao-Hui Wang
- Collaborative Innovation Center of Chemistry for Energy Materials
- State Key Laboratory for Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
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3
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Lozeman JJA, Führer P, Olthuis W, Odijk M. Spectroelectrochemistry, the future of visualizing electrode processes by hyphenating electrochemistry with spectroscopic techniques. Analyst 2020; 145:2482-2509. [DOI: 10.1039/c9an02105a] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reviewing the future of electrochemistry combined with infrared, Raman, and nuclear magnetic resonance spectroscopy as well as mass spectrometry.
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Affiliation(s)
- Jasper J. A. Lozeman
- BIOS Lab-on-a-Chip Group
- MESA+ Institute
- University of Twente
- 7522 NB Enschede
- The Netherlands
| | - Pascal Führer
- BIOS Lab-on-a-Chip Group
- MESA+ Institute
- University of Twente
- 7522 NB Enschede
- The Netherlands
| | - Wouter Olthuis
- BIOS Lab-on-a-Chip Group
- MESA+ Institute
- University of Twente
- 7522 NB Enschede
- The Netherlands
| | - Mathieu Odijk
- BIOS Lab-on-a-Chip Group
- MESA+ Institute
- University of Twente
- 7522 NB Enschede
- The Netherlands
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4
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Ye JY, Lin JL, Zhou ZY, Hong YH, Sheng T, Rauf M, Sun SG. Ammonia electrooxidation on dendritic Pt nanostructures in alkaline solutions investigated by in-situ FTIR spectroscopy and online electrochemical mass spectroscopy. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.12.062] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Fabre B, Li G, Gouttefangeas F, Joanny L, Loget G. Tuning the Photoelectrocatalytic Hydrogen Evolution of Pt-Decorated Silicon Photocathodes by the Temperature and Time of Electroless Pt Deposition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11728-11735. [PMID: 27779889 DOI: 10.1021/acs.langmuir.6b02122] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The electroless deposition of Pt nanoparticles (NPs) on hydrogen-terminated silicon (H-Si) surfaces is studied as a function of the temperature and the immersion time. It is demonstrated that isolated Pt structures can be produced at all investigated temperatures (between 22 and 75 °C) for short deposition times, typically within 1-10 min if the temperature is 45 °C or less than 5 min at 75 °C. For longer times, dendritic metal structures start to grow, ultimately leading to highly rough interconnected Pt networks. Upon increasing the temperature from 22 to 75 °C and for an immersion time of 5 min, the average size of the observed Pt NPs monotonously increases from 120 to 250 nm, and their number density calculated using scanning electron microscopy decreases from (4.5 ± 1.0) × 108 to (2.0 ± 0.5) × 108 Pt NPs cm-2. The impact of both the morphology and the distribution of the Pt NPs on the photoelectrocatalytic activity of the resulting metallized photocathodes is then analyzed. Pt deposited at 45 °C for 5 min yields photocathodes with the best electrocatalytic activity for the hydrogen evolution reaction. Under illumination at 33 mW cm-2, this optimized photoelectrode shows a fill factor of 45%, an efficiency (η) of 9.7%, and a short-circuit current density (|Jsc|) at 0 V versus a reversible hydrogen electrode of 15.5 mA cm-2.
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Affiliation(s)
- Bruno Fabre
- Matière Condensée et Systèmes Electroactifs (MaCSE), Institut des Sciences Chimiques de Rennes (ISCR), UMR 6226 CNRS and ‡ScanMAT-CMEBA, Université de Rennes 1 , Campus de Beaulieu, 35042 Rennes Cedex, France
| | - Gaozeng Li
- Matière Condensée et Systèmes Electroactifs (MaCSE), Institut des Sciences Chimiques de Rennes (ISCR), UMR 6226 CNRS and ‡ScanMAT-CMEBA, Université de Rennes 1 , Campus de Beaulieu, 35042 Rennes Cedex, France
| | - Francis Gouttefangeas
- Matière Condensée et Systèmes Electroactifs (MaCSE), Institut des Sciences Chimiques de Rennes (ISCR), UMR 6226 CNRS and ‡ScanMAT-CMEBA, Université de Rennes 1 , Campus de Beaulieu, 35042 Rennes Cedex, France
| | - Loic Joanny
- Matière Condensée et Systèmes Electroactifs (MaCSE), Institut des Sciences Chimiques de Rennes (ISCR), UMR 6226 CNRS and ‡ScanMAT-CMEBA, Université de Rennes 1 , Campus de Beaulieu, 35042 Rennes Cedex, France
| | - Gabriel Loget
- Matière Condensée et Systèmes Electroactifs (MaCSE), Institut des Sciences Chimiques de Rennes (ISCR), UMR 6226 CNRS and ‡ScanMAT-CMEBA, Université de Rennes 1 , Campus de Beaulieu, 35042 Rennes Cedex, France
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6
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Petrii OA. Electrosynthesis of nanostructures and nanomaterials. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4438] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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Liu HX, Tian N, Ye JY, Lu BA, Ren J, Huangfu ZC, Zhou ZY, Sun SG. A comparative study of CO adsorption on tetrahexahedral Pt nanocrystals and interrelated Pt single crystal electrodes by using cyclic voltammetry and in situ FTIR spectroscopy. Faraday Discuss 2015; 176:409-28. [PMID: 25654491 DOI: 10.1039/c4fd00136b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
This study focuses on CO adsorption at tetrahexahedral Pt nanocrystals (THH Pt NCs) by using cyclic voltammetry and in situ FTIR spectroscopy. Since the electrochemically prepared THH Pt NCs in this study are enclosed by {730} facets which could be considered by a subfacet configuration of 2{210} + {310}, we have also studied CO adsorption on the interrelated Pt(310) and Pt(210) single crystal electrodes as a comparison. Cyclic voltammetry results demonstrated that CO adsorbs dominantly on the (100) sites of THH Pt NCs at low CO coverage (θ(CO)≤ 0.135), while on both (100) and (110) sites at higher CO coverage. On ordered Pt(310) and Pt(210), i.e. they were flame annealed and then cooled in H(2) + Ar, CO adsorption also illustrates relative priority on (100) sites at low CO coverage; while at high CO coverage or on oxygen-disordered Pt(310) and Pt(210) when they were cooled in air after flame annealing, the adsorption of CO presents a weak preference on (100) sites of Pt(310) and even no preference at all on (100) sites of Pt(210). In situ FTIR spectroscopic studies illustrated that CO adsorption on THH Pt NCs yields anomalous infrared effects (AIREs), which are depicted by the Fano-like IR feature on a dense distribution (60 μm(-2)) and the enhancement of abnormal IR absorption on a sparse distribution (22 μm(-2)) of THH Pt NCs on glassy carbon substrate. Systematic investigation of CO coverage dependence of IR features revealed that, on THH Pt NCs, the IR band center (ν(COL)) of linearly bonded CO (COL) is rapidly shifted to higher wavenumbers along with the increase of CO coverage to 0.184, yielding a fast linear increase rate with a high slope (dν(COL)/dθ(IR)(CO) = 219 cm(-1)); when θ > 0.184, the increase of ν(COL) with θCO slows down and deviates drastically from linearity. In contrast, the ν(COL) on the ordered Pt(310) electrode maintains a linear increase with θ(IR)(CO) for the whole range of θ(IR)(CO) variation, and gives a much smaller increase rate of slope 74.3 cm(-1). The significant differences in CO adsorption behavior on THH Pt NCs and on interrelated Pt single crystal planes demonstrated clearly the unique properties of nanoparticles enclosed by high-index facets.
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Affiliation(s)
- Hai-Xia Liu
- State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, XiamenUniversity, Xiamen, 361005, China.
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9
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Yan S, Gao L, Zhang S, Zhang W, Li Y, Gao L. Synthesis of Au/C catalyst with high electrooxidation activity. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.01.087] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Kinetics of thiocyanate orientation conversion on Pt surface studied by in situ step-scan time-resolved microscope FTIR spectroscopy. CHINESE SCIENCE BULLETIN-CHINESE 2013. [DOI: 10.1007/s11434-012-5473-8] [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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11
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Li JT, Zhou ZY, Broadwell I, Sun SG. In-situ infrared spectroscopic studies of electrochemical energy conversion and storage. Acc Chem Res 2012; 45:485-94. [PMID: 22264174 DOI: 10.1021/ar200215t] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
With their ability to convert chemical energy of fuels directly into electrical power or reversibly store electrical energy, systems such as fuel cells and lithium ion batteries are of great importance in managing energy use. In these electrochemical energy conversion and storage (EECS) systems, controlled electrochemical redox reactions generate or store the electrical energy, ideally under conditions that avoid or kinetically suppress side reactions. A comprehensive understanding of electrode reactions is critical for the exploration and optimization of electrode materials and is therefore the key issue for developing advanced EECS systems. Based on its fingerprint and surface selection rules, electrochemical in-situ FTIR spectroscopy (in-situ FTIRS) can provide real-time information about the chemical nature of adsorbates and solution species as well as intermediate/product species involved in the electrochemical reactions. These unique features make this technique well-suited for insitu studies of EECS. In this Account, we review the characterization of electrode materials and the investigation of interfacial reaction processes involved in EECS systems by using state-of-the-art in-situ FTIR reflection technologies, primarily with an external configuration. We introduce the application of in-situ FTIRS to EECS systems and describe relevant technologies including in-situ microscope FTIRS, in-situ time-resolved FTIRS, and the combinatorial FTIRS approach. We focus first on the in-situ steady-state and time-resolved FTIRS studies on the electrooxidation of small organic molecules. Next, we review the characterization of electrocatalysts through the IR properties of nanomaterials, such as abnormal IR effects (AIREs) and surface enhanced infrared absorption (SEIRA). Finally, we introduce the application of in-situ FTIRS to demonstrate the decomposition of electrolyte and (de)lithiation processes involved in lithium ion batteries. The body of work summarized here has substantially advanced the knowledge of electrode processes and represents the forefront in studies of EECS at the molecular level.
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Affiliation(s)
- Jun-Tao Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, School of Energy Research, Xiamen University, Xiamen 361005, China
| | - Zhi-You Zhou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, School of Energy Research, Xiamen University, Xiamen 361005, China
| | - Ian Broadwell
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, School of Energy Research, Xiamen University, Xiamen 361005, China
| | - Shi-Gang Sun
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, School of Energy Research, Xiamen University, Xiamen 361005, China
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Rosendahl SM, Borondics F, May TE, Pedersen TM, Burgess IJ. Interface for time-resolved electrochemical infrared microspectroscopy using synchrotron infrared radiation. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:083105. [PMID: 21895231 DOI: 10.1063/1.3624693] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A description of a coupled electrochemical and spectrometer interface using synchrotron infrared radiation is provided. The interface described allows for the precise and accurate timing needed for time-resolved IR spectroscopic studies of electrochemical systems. The overall interface uses a series of transistor-transistor logic trigger signals generated from the commercial FTIR spectrometer to regulate the recording of control, electrochemical, and IR signals with reproducible and adjustable timing. The instrument has been tested using a thin-layer electrochemical cell with synchrotron light focused through microscope optics. The time-resolved response of the benzoquinone/dihydroxybenzoquinone redox couple is illustrated as an example of the instrument's capability.
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Affiliation(s)
- Scott M Rosendahl
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Rosendahl SM, Borondics F, May TE, Pedersen TM, Burgess IJ. Synchrotron Infrared Radiation for Electrochemical External Reflection Spectroscopy: A Case Study Using Ferrocyanide. Anal Chem 2011; 83:3632-9. [DOI: 10.1021/ac200250s] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Scott M. Rosendahl
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5C9 Canada
| | | | - Tim E. May
- Canadian Light Source, Saskatoon, Saskatchewan, S7N 0X4 Canada
| | - Tor M. Pedersen
- Canadian Light Source, Saskatoon, Saskatchewan, S7N 0X4 Canada
| | - Ian J. Burgess
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5C9 Canada
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Brimaud S, Jusys Z, Behm RJ. Controlled Surface Structure for In Situ ATR-FTIRS Studies Using Preferentially Shaped Pt Nanocrystals. Electrocatalysis (N Y) 2011. [DOI: 10.1007/s12678-011-0040-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Electrocatalytic reduction of nitric oxide on Pt nanocrystals of different shape in sulfuric acid solutions. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.06.045] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Zeng DM, Jiang YX, Zhou ZY, Su ZF, Sun SG. In situ FTIR spectroscopic studies of (bi)sulfate adsorption on electrodes of Pt nanoparticles supported on different substrates. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2009.11.035] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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Su ZF, Sun SG, Wu CX, Cai ZP. Study of anomalous infrared properties of nanomaterials through effective medium theory. J Chem Phys 2008; 129:044707. [DOI: 10.1063/1.2953441] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tian N, Zhou ZY, Sun SG, Ding Y, Wang ZL. Synthesis of tetrahexahedral platinum nanocrystals with high-index facets and high electro-oxidation activity. Science 2007; 316:732-5. [PMID: 17478717 DOI: 10.1126/science.1140484] [Citation(s) in RCA: 1675] [Impact Index Per Article: 98.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The shapes of noble metal nanocrystals (NCs) are usually defined by polyhedra that are enclosed by {111} and {100} facets, such as cubes, tetrahedra, and octahedra. Platinum NCs of unusual tetrahexahedral (THH) shape were prepared at high yield by an electrochemical treatment of Pt nanospheres supported on glassy carbon by a square-wave potential. The single-crystal THH NC is enclosed by 24 high-index facets such as {730}, {210}, and/or {520} surfaces that have a large density of atomic steps and dangling bonds. These high-energy surfaces are stable thermally (to 800 degrees C) and chemically and exhibit much enhanced (up to 400%) catalytic activity for equivalent Pt surface areas for electro-oxidation of small organic fuels such as formic acid and ethanol.
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Affiliation(s)
- Na Tian
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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Li JT, Chen QS, Sun SG. In situ microscope FTIR studies of methanol adsorption and oxidation on an individually addressable array of nanostructured Pt microelectrodes. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2006.12.082] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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In situ step-scan time-resolved microscope FTIR spectroscopy applied in irreversible electrochemical reactions. Electrochim Acta 2005. [DOI: 10.1016/j.electacta.2005.03.063] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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In situ step-scan time-resolved microscope FTIR spectroscopy working with a thin-layer cell. Electrochem commun 2005. [DOI: 10.1016/j.elecom.2005.03.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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22
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Wang HC, Sun SG, Yan JW, Yang HZ, Zhou ZY. In Situ STM Studies of Electrochemical Growth of Nanostructured Ni Films and Their Anomalous IR Properties. J Phys Chem B 2005; 109:4309-16. [PMID: 16851496 DOI: 10.1021/jp046313o] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have extended the study of anomalous IR properties, which were initially discovered on nanostructured films of platinum group metals and alloys, to nanostructured films of nickel, a member of the iron group triad, and broadened the fundamental knowledge on this subject. Nanostructured thin films of nickel supported on glassy carbon [nm-Ni/GC(n)] were prepared by electrochemical deposition under cyclic voltammetric conditions, and the thickness of films was altered systematically by varying the number (n) of potential cycling within a defined potential range for electrodeposition. Electrochemical in situ scanning tunneling microscopy (STM) was employed to monitor the electrochemical growth of nanostructured Ni films. These in situ STM images illustrated that, along the increase of the film thickness, Ni films have undergone a transformation from layer structure to island structure and finally to lumpish arris structure. Investigations by in situ FTIR spectroscopy employing adsorbed CO as the probe revealed that these nanostructures of Ni films yield abnormal IR features, Fano-like IR features, and normal IR features, respectively. The IR bands of CO adsorbed on Ni thin films of a layer structure were inverted in their direction and enhanced in their intensity up to 15.5 times on an nm-Ni/GC(4) electrode. The Fano-like IR features, which are defined as a bipolar band with its negative-going peak on the low wavenumber side and its positive-going peak on the high wavenumber side, are observed for the first time on Ni thin films of an island nanostructure, i.e., at the nm-Ni/GC(16) electrode. IR features changed to normal absorption in CO adsorbed on the nm-Ni/GC(25) electrode, i.e., that with lumpish arris nanostructured Ni film of a larger thickness.
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Affiliation(s)
- Han-Chun Wang
- State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005, China
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Chen YJ, Sun SG, Chen SP, Li JT, Gong H. Anomalous IR properties of nanostructured films created by square wave potential on an array of Pt microelectrodes: an in situ microscope FTIRS study of CO adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:9920-9925. [PMID: 15518475 DOI: 10.1021/la048484q] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Thin films of different nanostructures on an array of nine Pt microelectrodes were prepared by applying a square wave potential treatment for different times (tau). It has been measured from the cyclic voltammetric studies that the relative surface roughness of the films was increased slightly and reached a maximal value of about 2.5. SEM studies demonstrated that with the increase of tau, the growth of island-shaped Pt crystallites on the films led to the formation of plumelike crystallites that can reach about 2-3.5 microm in length when tau exceeded 70 min. In situ microscope FTIR reflection spectroscopic studies illuminated that CO adsorbed on the array yielded different anomalous IR features. With the increase of tau, the direction of the CO L band (linearly bonded CO) was transformed from the negative-going direction (normal IR adsorption) to bipolar (Fano-like spectral line shape) and finally to the positive-going direction (abnormal IR adsorption). The intensity of the CO L band was enhanced significantly and a maximal enhancement factor of about 33 was measured when tau was 40 min; the center of the CO L band and the Stark tuning rate also showed regular changes. This study demonstrated that specific nanostructures of Pt thin films can be prepared through a square wave potential treatment for different times and revealed the intrinsic relationship between anomalous IR properties and surface nanostructures of the thin films.
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Affiliation(s)
- You-Jiang Chen
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005, China
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