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Jang, Inyoung,Kim, Chanho,Kim, Sungmin,Yoon, Heesung Elsevier 2017 Ceramics international Vol.43 No.12
<P><B>Abstract</B></P> <P>In this study, solid oxide fuel cells (SOFCs) were fabricated using cerium oxide in the anode support layer (ASL) instead of gadolinium-doped ceria (GDC). To compensate for the deficiency in ionic conductivity and catalytic activity of CeO<SUB>2</SUB>, a gadolinium nitrate solution was infiltrated in the ASL before sintering at 1450°C. The ohmic and polarization resistance of the cell were reduced upon Gd-nitrate infiltration, which also increased the sinterability of the ASL. However, excessive infiltration was found to degrade the electrochemical properties of the cell. Therefore, the conditions for infiltration were optimized in this study. The peak power density of the cell after Gd-nitrate infiltration was 0.662W, 68% higher than that of the reference cell without Gd-nitrate infiltration.</P>
Jang, Inyoung,Kim, Sungmin,Kim, Chanho,Lee, Hyungjun,Yoon, Heesung,Song, Taeseup,Paik, Ungyu Elsevier 2019 Journal of Power Sources Vol.435 No.-
<P><B>Abstract</B></P> <P>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) is a promising cathode material for solid oxide fuel cells due to its high oxygen reduction reaction (ORR) activity. A gadolinium-doped ceria (GDC) barrier layer is essential to preventing side reactions between LSCF and an yttrium-stabilized zirconia (YSZ) electrolyte. However, several challenges are associated with the coating of GDC barrier layer on the YSZ electrolyte, including delamination of the GDC layer due to sinterability differences and formation of an insulating layer at a high annealing temperature. In this study, we describe a structure for a newly designed interfacial layer consisting of a GDC barrier layer and a nano-web–structured LSCF thin-film layer (NW-LSCF) through a facile spin-coating method. A dense GDC barrier layer with a thickness of approximately 400 nm was successfully applied to the surface of a YSZ electrolyte without delamination at a low annealing temperature. The high surface area of the NW-LSCF enhanced ORR due to an increased triple-phase boundary length. Cells employing a GDC barrier layer and NW-LSCF interlayer exhibited improved electrochemical performance. Peak power density reached 1.29 W/cm<SUP>2</SUP> at an operating temperature of 550 °C and 2.14 W/cm<SUP>2</SUP> at 650 °C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Newly designed interfacial layer structure is developed for interfacial engineering. </LI> <LI> Combined structure of GDC barrier layer/NW-LSCF improves electrochemical properties. </LI> <LI> The NW-LSCF enables higher oxygen reduction reaction at lower temperature. </LI> <LI> Results show the possibility of lowering SOFCs operating temperature. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jang, Inyoung,Kim, Sungmin,Kim, Chanho,Yoon, Heesung,Song, Taeseup Elsevier 2018 Journal of Power Sources Vol.392 No.-
<P><B>Abstract</B></P> <P>Lowering operation temperature of the solid oxide fuel cell is critical to improving its reliability and durability. However, the tradeoff between the operation temperature and the oxygen reduction reaction on the cathode side hinders lowering of the operation temperature. To address this issue, we employ a nano-web-structured 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> (NW-LSCF) thin-film layer as an interlayer on the cathode side. This thin-film layer enables operating the cell at a low temperature with enhancement of the electrochemical performance by increasing the oxygen-reduction reaction site and is fabricated via a simple spin-coating method. The large surface area of NW-LSCF enables significant improvement in the oxygen reduction reaction by an increased triple-phase boundary. In addition, the adhesion property between the gadolinium-doped ceria electrolyte and cathode is improved by the layer. In an anode-support-type single cell test, the peak power density of the cell with NW-LSCF is 0.57 W/cm<SUP>2</SUP> at 550 °C, which is an approximately 63% improvement compared to that of the cell without NW-LSCF. Moreover, the value is comparable to the peak power density of the cell without NW-LSCF operating at 600 °C. This finding suggests the possibility of lowering the operating temperature of the solid oxide fuel cell by introducing NW-LSCF into the cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A NW-LSCF was fabricated via a simple spin-coating method. </LI> <LI> The NW-LSCF was introduced between the cathode and electrolyte layer. </LI> <LI> The large surface area structure enables higher oxygen reduction reaction. </LI> <LI> Results show the possibility of lowering SOFCs operating temperature. </LI> </UL> </P>
Jang, Kuewhan,Park, Chanho,You, Juneseok,Choi, Jaeyeong,Park, Hyunjun,Park, Jinsung,Lee, Howon,Choi, Chang-Hwan,Na, Sungsoo IOP 2016 Nanotechnology Vol.27 No.47
<P>For several decades, silver nanomaterials (AgNMs) have been used in?various research areas?and commercial products. Among the?many AgNMs, silver nanowires (AgNWs) are one of the mostly?widely used nanomaterials due to their?high electrical and thermal conductivity. However, recent studies have investigated the toxicity of AgNWs. For this reason, it is necessary to develop a successful detection method of AgNWs for protecting human health. In this study, label-free, highly sensitive, direct, and real-time detection of AgNWs is performed for the first time. The detection mechanism is based on the resonance frequency shift upon the mass change from the hybridization between the probe DNA on the electrode and the linker DNA attached on AgNWs. The frequency shift is measured by using a quartz crystal microbalance. We are able to detect 1 ng ml<SUP>−1</SUP> of AgNWs in deionized water in real-time. Moreover, our detection method can selectively detect AgNWs among other types of one-dimensional nanomaterials and can also be applied to detection in drinking water.</P>
Kim, Chanho,Park, Hyunjung,Jang, Inyoung,Kim, Sungmin,Kim, Kijung,Yoon, Heesung,Paik, Ungyu Elsevier 2018 Journal of Power Sources Vol.378 No.-
<P><B>Abstract</B></P> <P>Controlling triple phase boundary (TPB), an intersection of the ionic conductor, electronic conductor and gas phase as a major reaction site, is a key to improve cell performances for low-temperature solid oxide fuel cells. We report a synthesis of morphologically well-defined Gd<SUB>0.1</SUB>Ce<SUB>0.9</SUB>O<SUB>1.95</SUB> (GDC) embedded Ba<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Co<SUB>0.8</SUB>Fe<SUB>0.2</SUB>O<SUB>3-δ</SUB> (BSCF) nanofibers and their electrochemical performances as a cathode. Electrospun fibers prepared with a polymeric solution that contains crystalline Ba<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Co<SUB>0.8</SUB>Fe<SUB>0.2</SUB>O<SUB>3-δ</SUB> particles in ∼200 nm size and Gd(NO<SUB>3</SUB>)<SUB>3</SUB>/Ce(NO<SUB>3</SUB>)<SUB>3</SUB> precursors in an optimized weight ratio of 3 to 2 result in one dimensional structure without severe agglomeration and morphological collapse even after a high calcination at 1000 °C. As-prepared nanofibers have fast electron pathways along the axial direction of fibers, a higher surface area of 7.5 m<SUP>2</SUP> g<SUP>−1</SUP>, and more oxygen reaction sites at TPBs than those of GDC/BSCF composite particles and core-shell nanofibers. As a result, the Gd<SUB>0.1</SUB>Ce<SUB>0.9</SUB>O<SUB>1.95</SUB> embedded Ba<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Co<SUB>0.8</SUB>Fe<SUB>0.2</SUB>O<SUB>3-δ</SUB> nanofiber cell shows excellent performances of the maximum power density of 0.65 W cm<SUP>−2</SUP> at 550 °C and 1.02 W cm<SUP>−2</SUP> at 600 °C, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fibrous cathode of SOFC was fabricated <I>via</I> facile electrospinning method. </LI> <LI> GDC/BSCF heterogeneous structure prevents the agglomeration during sintering. </LI> <LI> Ideal morphology was proposed in terms of high TPB density and fast charge transfer. </LI> <LI> GDC/BSCF fibrous cathode shows higher activity than particulate composite. </LI> </UL> </P>