BibTex format
@article{Weber:2024:10.1149/ma2024-02505113mtgabs,
author = {Weber, ML and Jennings, D and míd, B and Kindelmann, M and Fearn, S and Cavallaro, A and Gutsche, A and Heymann, L and Yasin, L and Cooper, SJ and Skinner, SJ and Dittmann, R and Aguadero, A and Fang, X and Lenser, C and Nemák, S and Gunkel, F},
doi = {10.1149/ma2024-02505113mtgabs},
journal = {ECS Meeting Abstracts},
pages = {5113--5113},
title = {Space Charge Effects on the Reaction Kinetics of Metal Exsolution and the Coalescence of Exsolved Nanoparticles},
url = {http://dx.doi.org/10.1149/ma2024-02505113mtgabs},
volume = {MA2024-02},
year = {2024}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - <jats:p> Metal exsolution reactions can be driven in fuel electrode materials under the reducing operation conditions of solid oxide cells. The process enables the synthesis of nanostructured catalysts based on the release of a fraction of reducible dopants from a perovskite host to its’ surface and the subsequent nucleation of finely dispersed oxide-supported metal nanoparticles. The performance of such catalysts strongly depends on the nanoparticle characteristics, such as the nanoparticle size and nanoparticle density.</jats:p> <jats:p>Consequently, dynamic structural and chemical changes of catalyst materials under operation conditions, oftentimes particularly affecting the catalyst surface <jats:italic>i.e.</jats:italic> the electrochemical interface, play a crucial role for the activity and stability of electrocatalysts. It is essential to understand the mechanistic processes that govern the material response to improve the lifetime of energy conversion devices such as water splitting catalysts or solid oxide cells.</jats:p> <jats:p>We employ epitaxial thin films with atomically defined surface morphologies to study the exsolution kinetics with respect to the mass transport of Ni dopants from the bulk to the perovskite surface. In addition, we investigate the subsequent growth and coalescence behavior of the exsolved nanoparticles during thermal reduction of the thin film samples. For this purpose, different approaches of defect-engineering are explored to investigate the role of donor-type and acceptor-type defect chemistry as well as the role of dislocations for exsolution reactions.</jats:p> <jats:p>We demonstrate that the electrostatic interactions of exsolution-active dopants with the surface potential that is correlated to the inherent surface space charge region of perovskite oxides determines the kinetics of metal exsolution in our material system. M
AU - Weber,ML
AU - Jennings,D
AU - míd,B
AU - Kindelmann,M
AU - Fearn,S
AU - Cavallaro,A
AU - Gutsche,A
AU - Heymann,L
AU - Yasin,L
AU - Cooper,SJ
AU - Skinner,SJ
AU - Dittmann,R
AU - Aguadero,A
AU - Fang,X
AU - Lenser,C
AU - Nemák,S
AU - Gunkel,F
DO - 10.1149/ma2024-02505113mtgabs
EP - 5113
PY - 2024///
SP - 5113
TI - Space Charge Effects on the Reaction Kinetics of Metal Exsolution and the Coalescence of Exsolved Nanoparticles
T2 - ECS Meeting Abstracts
UR - http://dx.doi.org/10.1149/ma2024-02505113mtgabs
UR - https://doi.org/10.1149/ma2024-02505113mtgabs
VL - MA2024-02
ER -