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RISS 인기검색어
- 검색키워드
- 저자 : Blinn, Kevin S. (검색결과 5 건)
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Enhanced performance of LSCF cathode through surface modification
Liu, M.,Ding, D.,Blinn, K.,Li, X.,Nie, L.,Liu, M. Pergamon Press ; Elsevier Science Ltd 2012 International journal of hydrogen energy Vol.37 No.10
Mixed ionic-electronic conductors in the family of La<SUB>x</SUB>Sr<SUB>1-x</SUB>Co<SUB>y</SUB>Fe<SUB>1-y</SUB>O<SUB>3-δ</SUB> (LSCF) have been widely studied as cathode materials for solid oxide fuel cells (SOFCs). However, the long-term stability and the limited surface catalytic activity are still a concern. Here we report a new catalyst La<SUB>0.4875</SUB>Ca<SUB>0.0125</SUB>Ce<SUB>0.5</SUB>O<SUB>2-δ</SUB> (LCC), which can significantly enhance the performance and stability of LSCF cathodes when applied as a thin-film coating on LSCF surface. For example, with 5 μL 0.25 mol L<SUP>-1</SUP> LCC solution infiltrated into LSCF cathode, the cathodic polarization resistance was reduced by ∼60% (to ∼0.076 Ω cm<SUP>2</SUP>) at 750 <SUP>o</SUP>C, leading to a peak power density of ∼1.25 W/cm<SUP>2</SUP>, which is ∼18% higher than that for the unmodified LSCF cathode in an anode-supported cell. In addition, stable power output was observed for over 500 h operation at 750 <SUP>o</SUP>C under a constant voltage of 0.7 V.
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Direct octane fuel cells: A promising power for transportation
Liu, M.,Choi, Y.,Yang, L.,Blinn, K.,Qin, W.,Liu, P.,Liu, M. Elsevier 2012 Nano energy Vol.1 No.3
The demand for electric vehicles has inspired extensive efforts to develop solid oxide fuel cells (SOFCs) for transportation. However, the high cost of hydrogen fueled SOFC systems and the deactivation of Ni-YSZ anodes in hydrocarbon fuels hinder the progress of SOFCs' development and commercialization. Here, we report a unique multi-functional anode for SOFCs that allows direct utilization of transportation fuels (iso-octane) without co-feeding O<SUB>2</SUB> and CO<SUB>2</SUB>, demonstrating a peak power density of ∼0.6W/cm<SUP>2</SUP> at 750<SUP>o</SUP>C. The multi-functional anode is derived from a conventional NiO-YSZ anode with BaCO<SUB>3</SUB> modification in the anode support, creating a catalytically active conformal coating of BaZr<SUB>1-x</SUB>Y<SUB>x</SUB>O<SUB>3-δ</SUB> (BZY) on YSZ and nano-islands of BaO on Ni surface, which greatly promote reforming of octane and oxidation of the reformed fuels. Further, the simple and cost-effective modification process can be readily adopted in the fabrication of the state-of-the-art NiO-YSZ supported cells.
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Li, Xiaxi,Lee, Jung-Pil,Blinn, Kevin S.,Chen, Dongchang,Yoo, Seungmin,Kang, Bin,Bottomley, Lawrence A.,El-Sayed, Mostafa A.,Park, Soojin,Liu, Meilin The Royal Society of Chemistry 2014 ENERGY AND ENVIRONMENTAL SCIENCE Vol.7 No.1
<P><I>In situ</I> probing of surface species and incipient phases is vital to unraveling the mechanisms of chemical and energy transformation processes. Here we report Ag nanoparticles coated with a thin-film SiO<SUB>2</SUB> shell that demonstrate excellent thermal robustness and chemical stability for surface enhanced Raman spectroscopy (SERS) study of solid oxide fuel cell materials under <I>in situ</I> conditions (at ∼400 °C).</P> <P>Graphic Abstract</P><P>SiO<SUB>2</SUB> shell isolated Ag nanoparticles significantly amplify the Raman signals from solid oxide fuel cell electrodes, allowing identification of surface species present in trace amounts under <I>in situ</I> conditions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3ee42462f'> </P>
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Lynch, Matthew E.,Yang, Lei,Qin, Wentao,Choi, Jong-Jin,Liu, Mingfei,Blinn, Kevin,Liu, Meilin Royal Society of Chemistry 2011 ENERGY AND ENVIRONMENTAL SCIENCE Vol.4 No.6
<P>A carefully designed test cell platform with a new electrode structure is utilized to determine the intrinsic surface catalytic properties of an electrode. With this design, the electrocatalytic activity and stability of an La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3−δ</SUB> (LSCF) cathode is enhanced by a dense thin La<SUB>0.85</SUB>Sr<SUB>0.15</SUB>MnO<SUB>3±δ</SUB> (LSM) coating, suggesting that an efficient electrode architecture has been demonstrated that can make effective use of desirable properties of two different materials: fast ionic and electronic transport in the backbone (LSCF) and facile surface kinetics on the thin-film coating (LSM). Theoretical analyses suggest that the enhanced electrocatalytic activity of LSM-coated LSCF is attributed possibly to surface activation under cathodic polarization due to the promotion of oxygen adsorption and/or dissociation by the surface layer and the dramatically increased oxygen vacancy population in the surface film. Further, the observed time-dependent activation over a few hundreds of hours and durability are likely associated with the formation of a favorable hybrid surface phase intermediate between LSM and LSCF. This efficient electrode architecture was successfully applied to the state-of-the-art LSCF-based cathodes by a simple solution infiltration process, achieving reduced interfacial resistance and improved stability under fuel cell operating conditions.</P> <P>Graphic Abstract</P><P>A La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3−δ</SUB> (LSCF) cathode coated with a thin, continuous La<SUB>0.85</SUB>Sr<SUB>0.15</SUB>MnO<SUB>3±δ</SUB> (LSM) layer demonstrated reduced resistance to oxygen reduction reactions while enhancing the stability at intermediate temperatures for SOFC operation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1ee01188j'> </P>
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Park, Hyungmin,Li, Xiaxi,Lai, Samson Y.,Chen, Dongchang,Blinn, Kevin S.,Liu, Mingfei,Choi, Sinho,Liu, Meilin,Park, Soojin,Bottomley, Lawrence A. American Chemical Society 2015 NANO LETTERS Vol.15 No.9
<P>Carbon deposition on nickel anodes degrades the performance of solid oxide fuel cells that utilize hydrocarbon fuels. Nickel anodes with BaO nanoclusters deposited on the surface exhibit improved performance by delaying carbon deposition (i.e., coking). The goal of this research was to visualize early stage deposition of carbon on nickel surface and to identify the role BaO nanoclusters play in coking resistance. Electrostatic force microscopy was employed to spatially map carbon deposition on nickel foils patterned with BaO nanoclusters. Image analysis reveals that upon propane exposure initial carbon deposition occurs on the Ni surface at a distance from the BaO features. With continued exposure, carbon deposits penetrate into the BaO-modified regions. After extended exposure, carbon accumulates on and covers BaO. The morphology and spatial distribution of deposited carbon was found to be sensitive to experimental conditions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-9/acs.nanolett.5b02237/production/images/medium/nl-2015-02237r_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5b02237'>ACS Electronic Supporting Info</A></P>
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