h1

TY  - THES
AU  - Liu, Shuai
TI  - Morphology and degradation of high temperature polymer electrolyte fuel cell electrodes
VL  - 479
PB  - RWTH Aachen University
VL  - Dissertation
CY  - Jülich
M1  - RWTH-2019-09902
T2  - Schriften des Forschungszentrums Jülich. Reihe Energie & Umwelt = Energy & environment
SP  - 1 Online-Ressource (III, 162 Seiten) : Illustrationen, Diagramme
PY  - 2019
N1  - Auch veröffentlicht auf dem Publikationsserver der RWTH Aachen University
N1  - Dissertation, RWTH Aachen University, 2019
AB  - The polybenzimidazole-based high-temperature polymer electrolyte fuel (HT-PEFC) has become a major topic in the clean energy field in recent years due to the appealing advantages, e.g., improved electrochemical kinetics and enhanced tolerance to carbon monoxide. However, the introduction of phosphoric acid (PA) in the membrane electrode assembly (MEA) leads to several issues, e.g., phosphate contaminations, accelerated Pt corrosion, and PA leaching. What is more, compared to classic PEFCs, the required higher Pt loading is another factor that impedes the commercialization of HT-PEFCs. The dissertation focuses on the electrochemical processes in the MEA, especially on the cathode side, to investigate the relations among the parameters of the MEA as well as study the degradation mechanism under different operating conditions. Various types of gas diffusion electrodes are fabricated by using different methods and recipes. Electron characterizations and electrochemical measurements demonstrate that the electrodes with more regular cracks and less PTFE agglomerations perform better. The PTFE binder plays a role in adjusting the PA distribution in the MEA and 10-25 wt.
LB  - PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
DO  - DOI:10.18154/RWTH-2019-09902
UR  - https://publications.rwth-aachen.de/record/771032
ER  -