E-Book, Englisch, 322 Seiten
Xing / Yin / Zhang Rotating Electrode Methods and Oxygen Reduction Electrocatalysts
1. Auflage 2014
ISBN: 978-0-444-63328-6
Verlag: Elsevier Science & Techn.
Format: EPUB
Kopierschutz: 6 - ePub Watermark
E-Book, Englisch, 322 Seiten
ISBN: 978-0-444-63328-6
Verlag: Elsevier Science & Techn.
Format: EPUB
Kopierschutz: 6 - ePub Watermark
Dr. Wei Xing is a Professor and Dean at the Advanced Chemical Power Sources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (CIAC-CAS). Prof. Xing received his PhD in Electrochemistry from CIAC-CAS in 1987, since then, as one of the key senior researchers, he established, and continues to lead the Laboratory of Advanced Power Sources at CIAC-CAS, that develops novel proton exchange membrane fuel cells (PEMFC) catalysts and technologies. His research is mainly concentrated on the R&D of fuel cell technologies including PEMFCs, direct methanol fuel cells (DMFCs), direct formic acid fuel cells (DFAFCs), in which cathode catalyst development for oxygen reduction reaction is the major focus. To date, he has published more than 160 referred journal papers, 3 books, 39 patents. Dr. Xing's research and scientific contributions are internationally recognized.
Autoren/Hrsg.
Weitere Infos & Material
Electrode Kinetics of Electron-Transfer Reaction and Reactant Transport in Electrolyte Solution
Abstract
In this chapter, to facilitate understanding and preparing the basic knowledge for rotating electrode theory, both the electron-transfer and reactant transport theories at the interface of electrode/electrolyte are presented. Regarding the reactant transport, three transportation modes such as diffusion, migration, and convection are described. A focusing discussion is given to the reactant diffusion near the electrode surface using both Fick's first and second laws. In addition, based on the approach in literature, the kinetics of reactant transport near and within a porous matrix electrode layer and its effect on the electron-transfer process is also presented using a simple equivalent electrode/electrolyte interface.
Keyword
Electrolyte solutionElectrochemical theoryElectrode reaction kineticsMass-transfer processOxygen reduction reaction (ORR)Oxygen solubilityRotating disk electrode (RDE)Rotating ring-disk electrode (RRDE)
Chapter Outline
2.2. Kinetics of Electrode Electron-Transfer Reaction?34
2.2.1. Fundamental Chemical Reaction Kinetics?34
2.2.2. Fundamentals of Electrode Reactions (Bulter–Volmer Equation)?35
2.3. Kinetics of Reactant Mass Transport Near Electrode Surface?44
2.3.1. Three Types of Reactant Transport in Electrolyte (Diffusion, Convection, and Migration)?45
2.3.3. Steady-State Diffusion–Convection Process of Reactant?54
2.4. Effect of Reactant Transport on the Electrode Kinetics of Electron-Transfer Reaction?57
2.4.1. Effect of Reactant Transport on the Kinetics of Electron-Transfer Process?57
2.4.2. Effect of Reactant Transport on the Thermodynamics of Electrode Reaction?59
2.5. Kinetics of Reactant Transport Near and within Porous Matrix Electrode Layer?61
Introduction
Kinetics of Electrode Electron-Transfer Reaction
Fundamental Chemical Reaction Kinetics
Fundamentals of Electrode Reactions (Bulter–Volmer Equation)1
Figure 2.1Schematic of the electrode electron-transfer and reactant diffusion process in an electrochemical system.CO(0,t) is the surface concentration of oxidant species, CR(0,t) is the surface concentration of reductant species, CO(x,t) is the bulk solution concentration of oxidant, and CR(x,t) is the bulk solution concentration of reductant species. In these four expressions of concentration, t is the reaction time. (For color version of this figure, the reader is referred to the online version of this book.)