About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
Chemical Modulation of Grain Boundaries and Electrochemical Interfaces for Enhanced Performance |
| Author(s) |
Harry L. Tuller, Thomas Defferriere, Han Gil Seo, Masahiro Yasutake, Zijie Sha |
| On-Site Speaker (Planned) |
Harry L. Tuller |
| Abstract Scope |
Functional ceramics play an increasingly critical role in energy conversion devices given unique electrical, electrochemical, and mechanical properties with ability to operate in harsh chemical and thermal environments at relatively low cost. Key challenges commonly include optimized initial performance and minimized degradation rates. Both objectives are often tied to how both internal (e.g. grain boundaries, phase boundaries) and external interfaces function during device operation. I begin by reviewing recent advances in our laboratory demonstrating extraordinary ability to control and manipulate catalytic activity at the rate controlling solid oxide fuel/electrolysis cell electrodes, allowing for both enhanced initial performance and markedly decreased degradation rates. I then go on to describe our ability to modulate ionic transport at grain boundaries in polycrystalline solid electrolytes with promise for reduced ohmic losses and reduced degradation resulting from current induced delamination and porosity |