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Seo, Jongsu,Tsvetkov, Nikolai,Jeong, Seung Jin,Yoo, Yeongeun,Ji, Sanghoon,Kim, Jeong Hwan,Kang, Jeung Ku,Jung, WooChul American Chemical Society 2020 ACS APPLIED MATERIALS & INTERFACES Vol.12 No.4
<P>Solid oxide fuel cells produce electricity directly by oxidizing methane, which is the most attractive natural gas fuel, and metal nanocatalysts are a promising means of overcoming the poor catalytic activity of conventional ceramic electrodes. However, the lack of thermal and chemical stability of nanocatalysts is a major bottleneck in the effort to ensure the lifetime of metal-decorated electrodes for methane oxidation. Here, for the first time, this issue is addressed by encapsulating metal nanoparticles with gas-permeable inorganic shells. Pt particles approximately 10 nm in size are dispersed on the surface of a porous La<SUB>0.75</SUB>Sr<SUB>0.25</SUB>Cr<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3</SUB> (LSCM) electrode via wet infiltration and are then coated with an ultrathin Al<SUB>2</SUB>O<SUB>3</SUB> layer via atomic layer deposition. The Al<SUB>2</SUB>O<SUB>3</SUB> overcoat, despite being an insulator, significantly enhances the immunity to carbon coking and provides high activity for the electrochemical oxidation of methane, thereby reducing the reaction impedance of the Pt-decorated electrode by more than 2 orders of magnitude and making the electrode activity of the Pt-decorated sample at 650 °C comparable with those reported at 800 °C for pristine LSCM electrodes. These observations provide a new perspective on strategies to lower the operation temperature, which has long been a challenge related to hydrocarbon-fueled solid oxide fuel cells.</P> [FIG OMISSION]</BR>
원자층 증착법을 통한 고체산화물 연료전지의 세라믹 인터페이스 제어
서종수(Jongsu Seo),정우철(WooChul Jung),김정환(Jeong Hwan Kim) 한국세라믹학회 2020 세라미스트 Vol.23 No.2
Solid oxide fuel cell (SOFC) have attracted much attention due to clean, efficient and environmentalfriendly generation of electricity for next-generation energy conversion devices. Recently, many studies have been reported on improving the performance of SOFC electrodes and electrolytes by applying atomic layer deposition (ALD) process, which has advantages of excellent film quality and conformality, and precise control of film thickness by utilizing its unique self-limiting surface reaction. ALD process with these advantages has been shown to provide functional ceramic interfaces for SOFC electrodes and electrolytes. In this article, recent examples of successful functionalization and stabilization on SOFC electrodes and electrolytes by the application of ALD process for realizing high performance SOFC cells are reported.