Author: Deborah Joy Zurawski
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
Book Description
The modification of the electroactivity of carbon monoxide electrosorbed on platinum by the coadsorption of a variety of inorganic and organic compounds (surface lateral modifiers) was probed using linear scan voltammetry. The shift in the peak potential for the CO electrooxidation reaction induced by the presence of the modifiers was measured as the ratio of modifier to CO in the mixed adlattice was varied. All compounds coadsorbed with CO inhibited the reaction. The extent of the positive shift in the peak potential and its dependence on coverage was a function of the type of modifier and its mode of attachment to the platinum surface. Two forces have been identified as factors in the poisoning of the CO electrooxidation reaction by coadsorbates. The structural component involves an alteration of the organization of the CO adlattice and was seen to be the major factor influencing the modification of the CO electrooxidation reaction by iodine. Low energy electron diffraction (LEED) results indicate that iodine compresses the CO adlattice electrosorbed on the single crystal Pt(111) surface. It has been postulated that these compressed structures are more difficult to nucleate towards oxidation than their unmodified counterparts, therefore a higher energy is needed to activate the adlattice and a more positive peak potential is observed. An electronic component was identified by analogy with gas phase, surface science research. The coadsorbates donate electronic charge to the surface which in turn causes an increase in the backdonation of electrons to the CO molecule. This shift in electronic charge strengthens the platinum-CO bond making it more difficult to remove CO from the surface. It has also been proposed that the modifier's electrons are polarized in the interfacial electric field present at the electrode surface. The electronic charge shifted towards the metal may screen the CO from the electric field which initiates the electrooxidation reaction. Additional topics covered are the organization of CO electrosorbed on Pt(111) compared to gas phase dosed CO and a new method for the preparation of single crystals for electrochemical applications.
Lateral Modification and the Organization of Mixed Adlattices on Polycrystalline and Single Crystal Platinum Electrodes
Author: Deborah Joy Zurawski
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
Book Description
The modification of the electroactivity of carbon monoxide electrosorbed on platinum by the coadsorption of a variety of inorganic and organic compounds (surface lateral modifiers) was probed using linear scan voltammetry. The shift in the peak potential for the CO electrooxidation reaction induced by the presence of the modifiers was measured as the ratio of modifier to CO in the mixed adlattice was varied. All compounds coadsorbed with CO inhibited the reaction. The extent of the positive shift in the peak potential and its dependence on coverage was a function of the type of modifier and its mode of attachment to the platinum surface. Two forces have been identified as factors in the poisoning of the CO electrooxidation reaction by coadsorbates. The structural component involves an alteration of the organization of the CO adlattice and was seen to be the major factor influencing the modification of the CO electrooxidation reaction by iodine. Low energy electron diffraction (LEED) results indicate that iodine compresses the CO adlattice electrosorbed on the single crystal Pt(111) surface. It has been postulated that these compressed structures are more difficult to nucleate towards oxidation than their unmodified counterparts, therefore a higher energy is needed to activate the adlattice and a more positive peak potential is observed. An electronic component was identified by analogy with gas phase, surface science research. The coadsorbates donate electronic charge to the surface which in turn causes an increase in the backdonation of electrons to the CO molecule. This shift in electronic charge strengthens the platinum-CO bond making it more difficult to remove CO from the surface. It has also been proposed that the modifier's electrons are polarized in the interfacial electric field present at the electrode surface. The electronic charge shifted towards the metal may screen the CO from the electric field which initiates the electrooxidation reaction. Additional topics covered are the organization of CO electrosorbed on Pt(111) compared to gas phase dosed CO and a new method for the preparation of single crystals for electrochemical applications.
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
Book Description
The modification of the electroactivity of carbon monoxide electrosorbed on platinum by the coadsorption of a variety of inorganic and organic compounds (surface lateral modifiers) was probed using linear scan voltammetry. The shift in the peak potential for the CO electrooxidation reaction induced by the presence of the modifiers was measured as the ratio of modifier to CO in the mixed adlattice was varied. All compounds coadsorbed with CO inhibited the reaction. The extent of the positive shift in the peak potential and its dependence on coverage was a function of the type of modifier and its mode of attachment to the platinum surface. Two forces have been identified as factors in the poisoning of the CO electrooxidation reaction by coadsorbates. The structural component involves an alteration of the organization of the CO adlattice and was seen to be the major factor influencing the modification of the CO electrooxidation reaction by iodine. Low energy electron diffraction (LEED) results indicate that iodine compresses the CO adlattice electrosorbed on the single crystal Pt(111) surface. It has been postulated that these compressed structures are more difficult to nucleate towards oxidation than their unmodified counterparts, therefore a higher energy is needed to activate the adlattice and a more positive peak potential is observed. An electronic component was identified by analogy with gas phase, surface science research. The coadsorbates donate electronic charge to the surface which in turn causes an increase in the backdonation of electrons to the CO molecule. This shift in electronic charge strengthens the platinum-CO bond making it more difficult to remove CO from the surface. It has also been proposed that the modifier's electrons are polarized in the interfacial electric field present at the electrode surface. The electronic charge shifted towards the metal may screen the CO from the electric field which initiates the electrooxidation reaction. Additional topics covered are the organization of CO electrosorbed on Pt(111) compared to gas phase dosed CO and a new method for the preparation of single crystals for electrochemical applications.
Dissertation Abstracts International
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 716
Book Description
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 716
Book Description
Chemical Sciences at Illinois
Author: University of Illinois at Urbana-Champaign. School of Chemical Sciences
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 112
Book Description
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 112
Book Description
American Doctoral Dissertations
Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 760
Book Description
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 760
Book Description
Government Reports Announcements & Index
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1318
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1318
Book Description
ACS Directory of Graduate Research 1993
Author: American Chemical Society. Committee on Professional Training
Publisher:
ISBN: 9780841227231
Category : Science
Languages : en
Pages : 1700
Book Description
Publisher:
ISBN: 9780841227231
Category : Science
Languages : en
Pages : 1700
Book Description
Government Reports Annual Index
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1448
Book Description
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1448
Book Description
Surface-Enhanced Raman Scattering
Author: Zhong-Qun Tian
Publisher: John Wiley & Sons Incorporated
ISBN: 9780470068083
Category : Science
Languages : en
Pages : 400
Book Description
Surface-Enhanced Raman Spectroscopy: Principles, Experiments, and Applications is a comprehensive, up to date, and balanced treatment of the theoretical and practical aspects of Surface-Enhanced Raman Scattering (SERS), a useful branch of spectroscopy for several areas of science. This book describes the basic principles of SERS, including SERS mechanisms, performing SERS measurements, and interpreting data. Also emphasized are applications in electrochemistry; catalysis; surface processing and corrosion; Self-Assemble-Layer and L-B Films; polymer science; biology; medicine and drug analysis; sensors; fuel cells; forensics; and archaeology. It is an essential guide for student and professional analytical chemists.
Publisher: John Wiley & Sons Incorporated
ISBN: 9780470068083
Category : Science
Languages : en
Pages : 400
Book Description
Surface-Enhanced Raman Spectroscopy: Principles, Experiments, and Applications is a comprehensive, up to date, and balanced treatment of the theoretical and practical aspects of Surface-Enhanced Raman Scattering (SERS), a useful branch of spectroscopy for several areas of science. This book describes the basic principles of SERS, including SERS mechanisms, performing SERS measurements, and interpreting data. Also emphasized are applications in electrochemistry; catalysis; surface processing and corrosion; Self-Assemble-Layer and L-B Films; polymer science; biology; medicine and drug analysis; sensors; fuel cells; forensics; and archaeology. It is an essential guide for student and professional analytical chemists.
Non-aqueous Solvent Systems
Author: Thomas Cudworth Waddington
Publisher:
ISBN:
Category : Nonaqueous solvents
Languages : en
Pages : 594
Book Description
Publisher:
ISBN:
Category : Nonaqueous solvents
Languages : en
Pages : 594
Book Description
Fuel Cell Catalysis
Author: Andrzej Wieckowski
Publisher: John Wiley & Sons
ISBN: 0470463740
Category : Science
Languages : en
Pages : 722
Book Description
Wiley Series on Electrocatalysis and Electrochemistry Fuel Cell Catalysis A Surface Science Approach A Core reference on fuel cell catalysis Fuel cells represent an important alternative energy source and a very active area of research. Fuel Cell Catalysis brings together world leaders in this field, providing a unique combination of state-of-the-art theory and computational and experimental methods. With an emphasis on understanding fuel cell catalysis at the molecular level, this text covers fundamental principles, future challenges, and important current research themes. Fuel Cell Catalysis: Provides a molecular-level description of catalysis for low-temperature polymer-electrolyte membrane fuel cells, including both hydrogen-oxygen cells and direct alcohol cells Examines catalysis issues of both anode and cathode such as oxygen reduction, alcohol oxidation, and CO tolerance Features a timely and forward-looking approach through emphasis on novel aspects such as computation and bio-inspiration Reviews the use and potential of surface-sensitive techniques like vibrational spectroscopy (IR, Raman, nonlinear spectroscopy, laser), scanning tunneling microscopy, X-ray scattering, NMR, electrochemical techniques, and more Reviews the use and potential of such modern computational techniques as DFT, ab initio MD, kinetic Monte Carlo simulations, and more Surveys important trends in reactivity and structure sensitivity, nanoparticles, "dynamic" catalysis, electrocatalysis vs. gas-phase catalysis, new experimental techniques, and nontraditional catalysts This cutting-edge collection offers a core reference for electrochemists, electrocatalysis researchers, surface and physical chemists, chemical and automotive engineers, and researchers in academia, research institutes, and industry.
Publisher: John Wiley & Sons
ISBN: 0470463740
Category : Science
Languages : en
Pages : 722
Book Description
Wiley Series on Electrocatalysis and Electrochemistry Fuel Cell Catalysis A Surface Science Approach A Core reference on fuel cell catalysis Fuel cells represent an important alternative energy source and a very active area of research. Fuel Cell Catalysis brings together world leaders in this field, providing a unique combination of state-of-the-art theory and computational and experimental methods. With an emphasis on understanding fuel cell catalysis at the molecular level, this text covers fundamental principles, future challenges, and important current research themes. Fuel Cell Catalysis: Provides a molecular-level description of catalysis for low-temperature polymer-electrolyte membrane fuel cells, including both hydrogen-oxygen cells and direct alcohol cells Examines catalysis issues of both anode and cathode such as oxygen reduction, alcohol oxidation, and CO tolerance Features a timely and forward-looking approach through emphasis on novel aspects such as computation and bio-inspiration Reviews the use and potential of surface-sensitive techniques like vibrational spectroscopy (IR, Raman, nonlinear spectroscopy, laser), scanning tunneling microscopy, X-ray scattering, NMR, electrochemical techniques, and more Reviews the use and potential of such modern computational techniques as DFT, ab initio MD, kinetic Monte Carlo simulations, and more Surveys important trends in reactivity and structure sensitivity, nanoparticles, "dynamic" catalysis, electrocatalysis vs. gas-phase catalysis, new experimental techniques, and nontraditional catalysts This cutting-edge collection offers a core reference for electrochemists, electrocatalysis researchers, surface and physical chemists, chemical and automotive engineers, and researchers in academia, research institutes, and industry.