| 학회 | 한국공업화학회 |
| 학술대회 | 2019년 가을 (10/30 ~ 11/01, 제주국제컨벤션센터(ICC JEJU)) |
| 권호 | 23권 2호 |
| 발표분야 | 포스터_전기화학 |
| 제목 | Study of electronic structure and mechanism of Ni-Fe hydroxide based electrocatalyst for oxygen evolution reaction |
| 초록 | In water electrolyzer systems, oxygen evolution reaction (OER) electrocatalysts are very important to reduce costs for system commercialization. In this regard, Ni-Fe based hydroxides are particularly well known as an effective electrocatalyst for OER. However, their mechanism are still unclear. Here in, we report Ni-Fe hydroxide catalyst supported on carbon (Ni-Fe/C) and their electrochemical properties were measured. The overpotential of Ni-Fe/C is 244.8 V at 10 mA cm-2. Furthermore, we investigated the electronic structure of Ni-Fe/C during OER operating condition using in situ X-ray absorption spectroscopy (XAS). And Ni and Fe structure of the electrocatalyst (K-edges) were measured to identify their oxidation states and local atomic structure. XANES data showed that the oxidation state of Ni changed from Ni2+ to more than Ni3+ even Ni4+ during OER in alkaline electrolytes. Based on these results, we offer new insight into the mechanism of Ni-Fe hydroxide electrocatalyst for OER. |
| 저자 | 한만호, 오형석 |
| 소속 | 한국과학기술(연) |
| 키워드 | Ni Fe hydroxide; oxygen evolution reaction; in situ X-ray absorption spectroscopy |
