Highly active and thermally stable single-atom catalysts for high-temperature electrochemical devices

Title
Highly active and thermally stable single-atom catalysts for high-temperature electrochemical devices
Authors
이해원김병국이종호채근화김형철손지원지호일장혜정윤경중황준연조민경양성은박승규홍승기홍종섭박미영신지수이영주아시프잔최성민최성준지텐드라팔신이윤정
Keywords
single atom catalyst; solid oxide fuel cell; solid oxide electrolysis cell
Issue Date
2020-12
Publisher
Energy & environmental science
Citation
VOL 13, NO 12-4920
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/72343
ISSN
1754-5692
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE