Min, Jihong Seo, Haewon Shin, Jisu Park, Mi Young Park, Sun-Young Choi, Haneul Park, Soohyung Yang, Sungeun Chang, Hye Jung Hong, Jongsup Yoon, Kyung Joong 2024-01-19T08:03:33Z 2024-01-19T08:03:33Z 2023-11-17 2023-12 2050-7488 https://pubs.kist.re.kr/handle/201004/113056 Atomically dispersed catalysts provide excellent catalytic properties and atom utilization efficiency, but their high-temperature application has been limited by their low thermal stability. Herein, we report atomically dispersed Pt catalysts that are both highly active and thermally stable in fuel cells and electrolyzers operating above 600 degrees C. We developed a urea-based chemical synthetic method that strongly anchors atomic-scale Pt species on the surface of ceria nanoparticles and prevents their agglomeration at high temperatures. Doping the ceria with gadolinia further enhances their catalytic properties by increasing the oxygen vacancy concentration and promoting the oxygen exchange kinetics. This process enables in situ synthesis within the porous electrode of realistic solid oxide cells and significantly improves the power output and H2 production rate in fuel cell and electrolysis modes, respectively. Furthermore, this electrode stably operated without noticeable degradation during a long-term evaluation, thus proving the excellent thermal stability of atomically dispersed Pt/ceria catalysts. Atomically dispersed Pt catalysts supported on ceria nanoparticles are synthesized in situ and improve the performance and stability of high-temperature solid oxide cells for electricity and hydrogen production. English Royal Society of Chemistry Atomically dispersed platinum electrocatalysts supported on gadolinia-doped ceria nanoparticles for practical high-temperature solid oxide cells Article 10.1039/d3ta05534e 1 Journal of Materials Chemistry A, v.11, no.46, pp.25298 - 25307 Journal of Materials Chemistry A 11 46 25298 25307 Y scie scopus 001090134900001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article IMPEDANCE SPECTROSCOPY FUEL-CELLS X-RAY ANODE PERFORMANCE OXIDATION CATALYSTS HYDROGEN SOFC METAL