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Description
The behavior of a solid oxide fuel cell (SOFC) cermet (ceramic-metal composite) anode under reaction conditions depends significantly on the structure, morphology and atomic scale interactions between the metal and the ceramic components. In situ environmental transmission electron microscope (ETEM) is an important tool which not only allows us to perform the basic nanoscale characterization of the anode materials, but also to observe in real-time, the dynamic changes in the anode material under near-reaction conditions. The earlier part of this dissertation is focused on the synthesis and characterization of Pr- and Gd-doped cerium oxide anode materials. A novel spray drying set-up was designed and constructed for preparing nanoparticles of these mixed-oxides and nickel oxide for anode fabrication. X-ray powder diffraction was used to investigate the crystal structure and lattice parameters of the synthesized materials. Particle size distribution, morphology and chemical composition were investigated using transmission electron microscope (TEM). The nanoparticles were found to possess pit-like defects of average size 2 nm after subjecting the spray-dried material to heat treatment at 700 °C for 2 h in air. A novel electron energy-loss spectroscopy (EELS) quantification technique for determining the Pr and Gd concentrations in the mixed oxides was developed. Nano-scale compositional heterogeneity was observed in these materials. The later part of the dissertation focuses mainly on in situ investigations of the anode materials under a H2 environment in the ETEM. Nano-scale changes in the stand-alone ceramic components of the cermet anode were first investigated. Particle size and composition of the individual nanoparticles of Pr-doped ceria (PDC) were found to affect their reducibility in H2 gas. Upon reduction, amorphization of the nanoparticles was observed and was linked to the presence of pit-like defects in the spray-dried material. Investigation of metal-ceramic interactions in the Ni-loaded PDC nanoparticles indicated a localized reduction of Ce in the vicinity of the Ni/PDC interface at 420 °C. Formation of a reduction zone around the interface was attributed to H spillover which was observed directly in the ETEM. Preliminary results on the fabrication of model SOFCs and in situ behavior of Ni/Gd-doped ceria anodes have been presented.
ContributorsSharma, Vaneet (Author) / Crozier, Peter A. (Thesis advisor) / Sharma, Renu (Thesis advisor) / Adams, James B (Committee member) / Dey, Sandwip (Committee member) / Arizona State University (Publisher)
Created2011
ContributorsASU Library. Music Library (Publisher)
Created2018-04-09
ContributorsJin, Leon (Performer) / Duo, Hongzuo (Performer) / Bergstedt, David (Performer) / Ellis, Gage (Performer) / Novak, Gail (Performer) / ASU Library. Music Library (Publisher)
Created2021-02-24
ContributorsWaters, Jared (Performer) / Creviston, Hannah (Performer) / Liu, Miao (Performer) / Guo, Hongzuo (Performer) / DeLaCruz, Nathaniel (Performer) / LoGuidice, Rosa (Performer) / Chiko, Ty (Performer) / Gatchel, David (Performer) / ASU Library. Music Library (Publisher)
Created2021-01-28
ContributorsKosminov, Vladislav (Performer) / Solari, John (Performer) / Liu, Shiyu (Performer) / Huang, Anruo (Performer) / Holly, Sean (Performer) / Novak, Gail (Performer) / Yang, Elliot (Performer) / Wu, Selene (Performer) / Kinnard, Zachariah (Performer) / Kuebelbeck, Stephen (Performer) / Johnson, Kaitlyn (Performer) / Bosworth, Robert (Performer) / Matejek, Ryan (Performer) / ASU Library. Music Library (Publisher)
Created2021-01-27
ContributorsSuehiro, Dylan (Conductor) / Kelley, Karen (Performer) / Ladley, Teddy (Performer) / ASU Library. Music Library (Publisher)
Created2021-04-19
Description
In order to cope with the decreasing availability of symphony jobs and collegiate faculty positions, many musicians are starting to pursue less traditional career paths. Also, to combat declining audiences, musicians are exploring ways to cultivate new and enthusiastic listeners through relevant and engaging performances. Due to these challenges, many community-based chamber music ensembles have been formed throughout the United States. These groups not only focus on performing classical music, but serve the needs of their communities as well. The problem, however, is that many musicians have not learned the business skills necessary to create these career opportunities. In this document I discuss the steps ensembles must take to develop sustainable careers. I first analyze how groups build a strong foundation through getting to know their communities and creating core values. I then discuss branding and marketing so ensembles can develop a public image and learn how to publicize themselves. This is followed by an investigation of how ensembles make and organize their money. I then examine the ways groups ensure long-lasting relationships with their communities and within the ensemble. I end by presenting three case studies of professional ensembles to show how groups create and maintain successful careers. Ensembles must develop entrepreneurship skills in addition to cultivating their artistry. These business concepts are crucial to the longevity of chamber groups. Through interviews of successful ensemble members and my own personal experiences in the Tetra String Quartet, I provide a guide for musicians to use when creating a community-based ensemble.
ContributorsDalbey, Jenna (Author) / Landschoot, Thomas (Thesis advisor) / McLin, Katherine (Committee member) / Ryan, Russell (Committee member) / Solis, Theodore (Committee member) / Spring, Robert (Committee member) / Arizona State University (Publisher)
Created2013