Mechanisms for charge-transfer processes at electrode/solid-electrolyte interfaces.

Chueh, William ; El Gabaly Marquez, Farid ; Whaley, Josh A. ; McCarty, Kevin F. ; McDaniel, Anthony H. ; Farrow, Roger L.

Sandia National Laboratories

关键词: Chemical State;    X-Ray Photoelectron Spectroscopy;    36 Materials Science;    Electric Potential;    Electric Charges;   

DOI  :  10.2172/1035349
RP-ID  :  SAND2011-8489
RP-ID  :  AC04-94AL85000
RP-ID  :  1035349

美国|英语

来源: UNT Digital Library

【 摘 要 】

This report summarizes the accomplishments of a Laboratory-Directed Research and Development (LDRD) project focused on developing and applying new x-ray spectroscopies to understand and improve electric charge transfer in electrochemical devices. Our approach studies the device materials as they function at elevated temperature and in the presence of sufficient gas to generate meaningful currents through the device. We developed hardware and methods to allow x-ray photoelectron spectroscopy to be applied under these conditions. We then showed that the approach can measure the local electric potentials of the materials, identify the chemical nature of the electrochemical intermediate reaction species and determine the chemical state of the active materials. When performed simultaneous to traditional impedance-based analysis, the approach provides an unprecedented characterization of an operating electrochemical system.