Highly active and thermally stable single-atom catalysts for high-temperature electrochemical devices
- Highly active and thermally stable single-atom catalysts for high-temperature electrochemical devices
- 이해원; 김병국; 이종호; 채근화; 김형철; 손지원; 지호일; 장혜정; 윤경중; 황준연; 조민경; 양성은; 박승규; 홍승기; 홍종섭; 박미영; 신지수; 이영주; 아시프잔; 최성민; 최성준; 지텐드라팔신; 이윤정
- single atom catalyst; solid oxide fuel cell; solid oxide electrolysis cell
- Issue Date
- Energy & environmental science
- VOL 13, NO 12-4920
- Single-atom catalysts provide unique catalytic properties and maximize the atom utilization efficiency. While utilizing them at elevated temperatures is highly desirable, their operating temperature is usually kept below 300 °C to prevent isolated atoms from agglomerating. Moreover, their applications in high-temperature electrochemical devices have been hindered by the lack of suitable processing techniques for catalyst loading. Herein, we report single-atom Pt/ceria nanocatalysts that are highly active and thermally stable in solid oxide cells (SOCs) operating at 600？800 °C. Our urea-based chemical solution process creates strong Pt？O？Ce interactions that securely anchor isolated Pt atoms to the surface of ceria nanoparticles and suppress their high-temperature migration. These single-atom Pt/ceria nanocatalysts are loaded in the oxide fuel electrode of a SOC via an in situ synthetic process, which reduces the polarization resistance from 28.2 to 0.82 Ohm cm2 at 600 °C. This electrode outperforms the state-of-the-art Ni-based fuel electrode by up to 10 times and delivers extremely high performance in full SOCs in fuel cell and electrolysis modes. Furthermore, it stably operates at 700 °C for over 500 h under realistic operating conditions. Our results provide guidance to resolve the critical issues for the practical use of single-atom catalysts in various industrial processes and accelerate the commercial development of next-generation high-temperature energy devices.
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