Synthesis, Characterization, Modeling and Applications of Functional Porous Materials: Functional Porous Materials III
Sponsored by: ACerS: Engineering Ceramics Division, ACerS: Electronics Divisions
Program Organizers: Lan Li, Boise State University; Winnie Wong-Ng, National Institute of Standards and Technology; Kevin Huang, University of South Carolina
Tuesday 2:00 PM
November 3, 2020
Room: Virtual Meeting Room 21
Location: MS&T Virtual
Session Chair: Kevin Huang, University of South Carolina
2:00 PM Invited
Crystallinity Effect on Mesoporous TiO2 Nanoparticle Negative Electrode Material for Metal Ion Batteries
: Hui Xiong1; Changjian Deng1; Paige Skinner1; Yuzi Liu2; Wenqian Xu2; Hua Zhou2; Xianghui Zhang3; Di Wu3; Yadong Yin4; Yang Ren2; 1Boise State University; 2Argonne National Laboratory; 3Washington State University; 4University of California - Riverside
Nanoscale oxide-based negative electrodes are of great interest for rechargeable metal ion batteries due to their high energy density, power density and enhanced safety. Here, we report a case study on mesoporous TiO2 nanoparticle negative electrode with uniform size and varying crystallinity to investigate the trend in the electrochemical properties of oxide-based nanoscale negative electrodes with varying crystallinity. Mesoporous solid spherical TiO2 nanoparticles with a uniform particle size and varying crystallinity, i.e., amorphous TiO2 (A-TiO2), partially crystalline TiO2 (PC-TiO2) and fully crystalline TiO2 (FC-TiO2) nanoparticles were studied. The effect of crystallinity in the mesoporous TiO2 nanoparticle electrodes was investigated under quasi steady-state and off equilibrium states through electrochemical characterizations as well as synchrotron pair distribution function analysis.
2:30 PM
Low/Intermediate Temperature Polysiloxane Derived Ceramics with Increased Carbon for Electrical Applications: Michelle Greenough1; Zeyu Zhao1; Jianhua Tong1; Luiz Jacobsohn1; Rajendra Bordia1; 1Clemson University
Low/Intermediate temperature (below 1000°C) pyrolyzed polymer derived ceramics are amorphous ceramics with highly porous microstructure. They have a unique combination of properties including high surface area, and pore size in the range of micropores. If high electrical conductivity can be realized, they would be candidates for safer anodes for Li-ion batteries. In this research, we present results on samples composed of polysiloxane polymers, with increasing weight percent of divinylbenzene and pyrolyzed at temperatures ranging from 600 to 900°C. The effect of pyrolysis temperature and carbon content on the resultant material’s microstructure, chemistry, and electrical conductivity was investigated by using Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and electrochemical impedance spectroscopy (EIS). These results will be used to determine the relationship between the composition, microstructure, and nature of carbon on the electrical conductivity.
2:50 PM
The Influence of Yttria Content and Synthetic Parameters on the Thermal Stability of Yttria-stabilized Zirconia Aerogels: Nathaniel Olson1; Frances Hurwitz2; Haiquan Guo3; Richard Rogers2; Jessica Krogstad1; 1University of Illinois Urbana Champaign; 2NASA Glenn Research Center; 3Ohio Aerospace Institute
Aerogels demonstrate extraordinarily low thermal conductivity and low density, presenting a promising form of lightweight insulation for aerospace applications. The primary challenge is stabilization of the highly porous structure at temperatures to 1200 °C. Upon collapse of the pore structure, the favorable thermal properties and low density are diminished. Yttria-stabilized zirconia (YSZ) aerogels are synthesized to investigate the effect of composition on morphology, phase behavior, and thermal stability (specific surface area, pore size distribution). This work demonstrates the improvement in thermal stability of zirconia aerogels with increased yttria content. To develop insight on the influence of structure on thermal stability, the effects of water content and solids loading are studied and aid in elucidation of the mechanism by which yttria stabilizes the pore structure. With an improved understanding of aerogel structure and performance, metal oxide aerogels can be developed to withstand the extreme environments of space exploration.