About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Nanoionics Drastically Accelerating Mass Transfer at Elevated Temperatures Over 750 °C |
| Author(s) |
Xueyan Song, Cesar-Octavio Romo-De-La-Cruz, Fuming Jiang, Yun Chen |
| On-Site Speaker (Planned) |
Xueyan Song |
| Abstract Scope |
Nanoionics were previously considered thermally unstable and infeasible for devices operating above 500 °C. Here, we elucidate the design principle for establishing stable nanoionics from various oxides. We utilize reversible solid oxide cells (SOCs) as the test bed and implement nanoionics using atomic layer deposition (ALD). We demonstrate a straightforward, interface-controlled, practical approach to render a conformal, ~15 nm thick ALD film, which initially thermodynamically favors the formation of a solid solution with the substrate, into surface nanoionics with single or double layers of nanograins with random crystal orientations. The nanoionics exhibited conductivity estimated to be seven orders of magnitude higher than that of their bulk-scale counterpart. They demonstrated conformability with uniform grain sizes of ~15 nm, even after electrochemical operation for ~500 hours at 750 °C and 1000 hours at 850 °C, respectively. The thermal stability and conductivity of such nanoionics represent a conceptual and technological framework in nanoionics. |
