Details

Autor(en) / Beteiligte

• Shin, Jisu
• Lee, Young Joo
• Jan, Asif
• Choi, Sung Min
• Park, Mi Young
• Choi, Sungjun
• Hwang, Jun Yeon
• Hong, Seungki
• Park, Seung Gyu
• Chang, Hye Jung
• Cho, Min Kyung
• Singh, Jitendra Pal
• Chae, Keun Hwa
• Yang, Sungeun
• Ji, Ho-Il
• Kim, Hyoungchul
• Son, Ji-Won
• Lee, Jong-Ho
• Kim, Byung-Kook
• Lee, Hae-Weon
• Hong, Jongsup
• Lee, Yun Jung
• Yoon, Kyung Joong

Titel

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

Ist Teil von

• Energy & environmental science, 2020-12, Vol.13 (12), p.493-492

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 cm 2 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. Single-atom Pt/ceria catalysts are extremely active and thermally stable at over 700 °C in high-temperature solid oxide cell electrodes.