Synthesis, Characterization and Application of 3D Graphene: Session I
Program Organizers: Yun Hu, Michigan Technological University; Siyuan Fang, Michigan Technological University
Wednesday 8:00 AM
November 4, 2020
Room: Virtual Meeting Room 24
Location: MS&T Virtual
Session Chair: Yun Hu, Michigan Technological University
8:00 AM Invited
Development of Highly Efficient TCR with Free-standing Multilayer Graphene: Minhee Yun1; 1University of Pittsburgh
Graphene has many excellent properties that lend themselves to electronic, optical, and thermal applications. In order to create these devices, it is imperative to understand how the properties of single layer and multilayer graphene are modified by substrate and surface interactions. This work experimentally determines the resistance change due to temperature in graphene due to the substrate. This work also investigates how adding nanoparticles to the graphene surface may additionally modify the properties of graphene. Our results indicate a clear modification of the properties of graphene due to substrate and surface interactions.
8:30 AM Invited
Synthesis and Application of 3D Surface-microporous Graphene: Yun Hu1; 1Michigan Technological University
Recently, we synthesized 3D surface-microporous graphene directly from CO2 via its reaction with alkaline metals (Li, Na, or K). Furthermore, this novel nanomaterial exhibited excellent performances as electrodes for energy devices, such as solar cells, supercapacitors, fuel cells, and batteries. In this presentation, I will highlight these findings.
9:10 AM Invited
Graphene-enabled Nanocomposites: Xiaodong Li1; 1University of Virginia
Graphene is a game changing material. We cloned nacre’s hierarchical architecture and reinforcing mechanisms in engineered materials by simply shear mixing, freeze drying, and sintering of metal powders and graphene sheets. Such man-made nacre-like graphene/metal composites achieved an exceptional enhancement in both strength and toughness. We also demonstrate that a small amount of graphene is able to minimize porosity/defects and reinforce carbon fibers. In addition, graphene has been used to composite battery electrodes and separators to enhance battery performance and lifespan. The design strategies and model material systems should guide the synthesis of graphene nanocomposites.
9:40 AM
3D Graphene as an Efficient Electrode for Capacitive Deionization: Siyuan Fang1; Liang Chang1; Yun Hang Hu1; 1Michigan Technological University
Capacitive deionization is a state-of-art water treatment technology based on ion electrostatic adsorption on electrode surface. 3D graphene synthesized via exothermic reaction between liquid potassium and carbon monoxide gas was demonstrated as an efficient electrode material for capacitive deionization, exhibiting a specific capacity of 207.4 F/g at 0.2 A/g in 1 M NaCl aqueous solution. In a batch-mode recycling system, the electrosorption capacity of the 3D graphene electrode reached 5.70 and 9.60 mg/g at 1.5 V in 50 and 295 mg/L NaCl aqueous solutions, respectively. The excellent electrosorption capacity of 3D graphene electrode, especially under low saline concentration, is attributed to the synergistic effect of its large surface area, unique channel structure, and oxygen functional groups.