TY - JOUR
T1 - On Hydride Diffusion in Transition Metal Perovskite Oxyhydrides Investigated via Deuterium Exchange
AU - Tang, Ya
AU - Kobayashi, Yoji
AU - Shitara, Kazuki
AU - Konishi, Ayako
AU - Kuwabara, Akihide
AU - Nakashima, Takahide
AU - Tassel, Cédric
AU - Yamamoto, Takafumi
AU - Kageyama, Hiroshi
N1 - Generated from Scopus record by KAUST IRTS on 2022-09-13
PY - 2017/10/10
Y1 - 2017/10/10
N2 - Perovskite oxyhydrides may find diverse applications, ranging from catalysis, topochemical synthesis to solid state ionics, but the understanding of their hydride transport behavior has remained limited. Here, gaseous hydrogen exchange and release experiments were analyzed using the Kissinger method to estimate the activation energy (Ea) for H/D exchange and H2 release in BaTiO3-xHx (x = 0.35-0.60) and LaSrCoO3H0.70. It is revealed that, for each BaTiO3-xHx at a given hydride concentration (x), both H/D exchange and H2 release experiments provide similar Ea values. For BaTiO3-xHx with different x, the obtained Ea values significantly decrease with increasing x until around 0.4; beyond 0.4, it becomes nearly constant (200-220 kJ mol-1). This observation suggests that the diffusion process in the low hydride concentration (x < 0.4) includes oxide as well as hydride diffusion, whereas, for 0.4 < x (
AB - Perovskite oxyhydrides may find diverse applications, ranging from catalysis, topochemical synthesis to solid state ionics, but the understanding of their hydride transport behavior has remained limited. Here, gaseous hydrogen exchange and release experiments were analyzed using the Kissinger method to estimate the activation energy (Ea) for H/D exchange and H2 release in BaTiO3-xHx (x = 0.35-0.60) and LaSrCoO3H0.70. It is revealed that, for each BaTiO3-xHx at a given hydride concentration (x), both H/D exchange and H2 release experiments provide similar Ea values. For BaTiO3-xHx with different x, the obtained Ea values significantly decrease with increasing x until around 0.4; beyond 0.4, it becomes nearly constant (200-220 kJ mol-1). This observation suggests that the diffusion process in the low hydride concentration (x < 0.4) includes oxide as well as hydride diffusion, whereas, for 0.4 < x (
UR - https://pubs.acs.org/doi/10.1021/acs.chemmater.7b02240
UR - http://www.scopus.com/inward/record.url?scp=85031037509&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.7b02240
DO - 10.1021/acs.chemmater.7b02240
M3 - Article
SN - 1520-5002
VL - 29
SP - 8187
EP - 8194
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 19
ER -