| 초록 |
Molecular barrier materials (MBMs) which can block the access of phosphoric anions were introduced to prevent phosphoric acid poisoning. It is one of the main factors that degrade the catalytic activity of HT-PEMFC. Barrier materials were designed as a structural and physical blocker, but still to maintain the catalytic activity. The smaller oxygen is easy to pass through the MBM, so that it can react on the Pt surface, but the bigger phosphoric anions are blocked by the MBMs before they reach on the Pt. As a candidate, binaphthyl structure was expected to create a barrier environment on Pt catalyst because naphthalenes of bi-naphthyl are limited in the rotation on a C-1 axis by the repulsive force of the oxygen atoms at C-2. Herein we focused on the synthesis of the target MBMs and tested the ability to prevent phosphoric acid poisoning. Pt catalyst treated with MBMs was subjected to oxygen reduction reaction measurements and the results were analyzed. |
