| 초록 |
Electrochemical energy conversion has advanced substantially over the past few decades, both in fundamental and in engineering aspects. As the performance of such devices depends intimately on the properties of their materials, i.e. catalysts, considerable attentions have been made to search promising new catalytic materials. However, their rationalizations unfortunately suffer from the lack of fundamental understandings of electrocatalysis, which hinders a successful design of the next-generation catalysts. To solve these problems, we have paid many efforts for ascertainment of the reaction/degradation mechanisms and of the fundamental relationships between the physicochemical and electrochemical properties, through advanced in/ex situ analytical techniques. Especially, scanning flow cell coupled with an ICP-MS and a DEMS provides valuable insights in (de)activation process of electrocatalytic materials during the electrochemical operations. Based on the newly obtained fundamental understandings, we suggest synthetic strategies to reach high activity and stability of carbon-based catalysts, which incorporate site-isolated Fe-N4 moieties, for their applications in fuel cells. |
