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- 저자 : O'Hayre, Ryan (검색결과 3 건)
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Ryu, Jiseung,O'Hayre, Ryan,Lee, Heesoo Cambridge University Press (Materials Research Soc 2014 Journal of materials research Vol.29 No.22
<▼1><B>Abstract</B><P/></▼1><▼2><P>Cobalt was doped into the Ce-doped SrMnO3 system to enhance the low ionic conductivity of Ce-doped SrMnO3 (SCM) for solid oxide fuel cell cathode application. Structural and conductivity changes as a function of the Co content were investigated. Sr0.9Ce0.1Mn1-<I>x</I>Co<I>x</I>O3−δ (SCMCo, <I>x</I> = 0.1, 0.2, 0.3) cathode materials were synthesized by an EDTA citrate complexing process, which yielded a single perovskite structure, and the lattice volume was expanded by substituting Ce and Co ions. The increased lattice volume was attributed to a decrease in the valence state of the manganese and cobalt and an increase in the oxygen vacancy concentration. An increase in the concentration of oxygen vacancies with increasing Co content was identified by thermogravimetric analysis. The electrical conductivity decreased with increasing Co content, which was attributed to an increase in the activation energy for polaron hopping. Although the electrical conductivity was decreased by cobalt-doping, the polarization resistance of SCMCo also decreased significantly (from 5.611 to 1.171 Ω cm<SUP>2</SUP> at 800 °C). The decreased polarization resistance is attributed to enhanced oxygen-ion transfer kinetics with cobalt-doping. We conclude that cobalt substitution leads to enhancement in the electrochemical properties of the cathode due to an increase in oxygen vacancy concentration.</P></▼2>
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Park, Taehyun,Chang, Ikwhang,Jung, Ju Hae,Lee, Ha Beom,Ko, Seung Hwan,O'Hayre, Ryan,Yoo, Sung Jong,Cha, Suk Won Elsevier 2017 ENERGY Vol.134 No.-
<P><B>Abstract</B></P> <P>This work investigates the effect of assembly pressure on the performance of a bendable polymer electrolyte fuel cell based on silver nanowire current collectors. We define assembly pressure as the compressive stress exerted by the bendable fuel cell flow structure on the membrane electrode assembly. The performance of the bendable fuel cell increases with increasing assembly pressure while the corresponding ohmic and charge transfer resistances of the fuel cell decrease. While in certain circumstances bending can increase fuel cell performance because it increases the assembly pressure internally exerted on the MEA, we also find that deformation of the flow structures upon bending the fuel cell can negatively affect performance due to non-uniform disruptions in the distribution of reactants. We extract the key electrochemical parameters that are most sensitive to assembly pressure and develop a simulation model for bendable fuel cells using these parameters. This model is validated against the experimental data of here and previous studies, thereby showing the feasibility of engineering the bendable fuel cells for various demands.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bendable polymer electrolyte fuel cell was fabricated using silver nanowires. </LI> <LI> Effect of assembly pressure on bendable fuel cell was investigated experimentally. </LI> <LI> Causes of performance loss by bending in bendable fuel cell were figured out. </LI> <LI> Simulation model of bendable fuel cell was established based on experimental data. </LI> <LI> Simulation model predicts performances of other bendable fuel cells in literatures. </LI> </UL> </P>
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