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This book is your graduate level entrance into battery, fuel cell and solar cell research at synchrotron x-ray sources. Materials scientists find numerous examples for the combination of electrochemical experiments with simple and with highly complex x-ray scattering and spectroscopy methods. Physicists and chemists can link applied electrochemistry with fundamental concepts of condensed matter physics, physical chemistry and surface science. Contents: Introduction Molecular Structure and Electronic Structure Crystal Structure and Microstructure Real Space Imaging and Tomography Resonant Methods and Chemical Contrast Variation Surface Sensitive and Volume Sensitive Methods Organic and Bio-Organic Samples Complex Case Studies / Electrochemical In Situ Studies Correlation of Electronic Structure And Conductivity Radiation Damages Background Subtraction X-Ray Physics Nobel Prizes Synchrotron Centers World Electromagnetic Spectrum Kα,Β X-Ray Energies Periodic Table of Elements
This book is your graduate level entrance into battery, fuel cell and solar cell research at synchrotron x-ray sources and free electron lasers. Materials scientists find numerous examples for the combination of electrochemical experiments with simple and with highly complex x-ray scattering and spectroscopy methods. Physicists and chemists can link applied electrochemistry with fundamental concepts of condensed matter physics, physical chemistry and surface science.
The development of better energy conversion and storage devices, such as fuel cells and batteries, is crucial for reduction of our global carbon footprint and improving the quality of the air we breathe. However, both of these technologies face important challenges. The development of lower cost and better electrode materials, which are more durable and allow more control over the electrochemical reactions occurring at the electrode/electrolyte interface, is perhaps most important for meeting these challenges. Hence, full characterization of the electrochemical processes that occur at the electrodes is vital for intelligent design of more energy efficient electrodes. X-ray absorption spectroscopy (XAS) is a short-range order, element specific technique that can be utilized to probe the processes occurring at operating electrode surfaces, as well for studying the amorphous materials and nano-particles making up the electrodes. It has been increasingly used in recent years to study fuel cell catalysts through application of the and Δ and mgr; XANES technique, in combination with the more traditional X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) techniques. The and Δ and mgr; XANES data analysis technique, previously developed and applied to heterogeneous catalysts and fuel cell electrocatalysts by the GWU group, was extended in this work to provide for the first time space resolved adsorbate coverages on both electrodes of a direct methanol fuel cell. Even more importantly, the and Δ and mgr; technique was applied for the first time to battery relevant materials, where bulk properties such as the oxidation state and local geometry of a cathode are followed.
Materials are a pacing problem in battery development. The battery environment, particularly in rechargeable batteries, places great demands on materials. Characterization of battery materials is difficult because of their complex nature. In many cases meaningful characterization requires iii situ methods. Fortunately, several new electrochemical and spectroscopic techniques for in situ characterization studies have recently become available, and reports of new techniques have become more frequent. The opportunity now exists to utilize advanced instrumentation to define detailed features, participating chemical species and interfacial structure of battery materials with a precision heretofore not possible. This overview gives key references to these techniques and discusses the application of x-ray absorption spectroscopy to the study of battery materials.