Aramid Nanofiber-Functionalized Graphene Electrodes for Structural - PowerPoint PPT Presentation

Aramid Nanofiber-Functionalized Graphene Electrodes for Structural Load- Bearing Energy Storage AFOSR Grant No. FA9550-16-1-0230 Jodie L. Lutkenhaus, Dimitris Lagoudas, James Boyd, Micah Green, Texas A&M University 05/15/2016 – 05/14/2019 Haleh Ardebili, University of Houston Overall Long-term Goal: Breakthrough Discoveries To realize multifunctional structural capacitors and Brick-and-Mortar Reduced Graphene Oxide / Aramid Nanofiber batteries that have enhanced mechanical properties, resulting (rGO/ANF) Capacitors in mass and volume savings. The unifying challenge in this area is to address both electrochemical and mechanical • Electrodes made by vacuum filtration exhibit enhanced stiffness, properties in a single multifunctional unit. strength, and toughness because of the brick-and-mortar structure and hydrogen—bonding interfacial interactions Project Overview: • A micromechanics model was developed using experimental observations to investigate rGO waviness • rGO and ANF waviness decreases the predicted elastic moduli • Predicted waviness effect on conductivity is less significant compared to that of elastic modulus

Aramid Nanofiber-Functionalized Graphene Electrodes for Structural Load- Bearing Energy Storage AFOSR Grant No. FA9550-16-1-0230 Jodie L. Lutkenhaus, Dimitris Lagoudas, James Boyd, Micah Green, Texas A&M University 05/15/2016 – 05/14/2019 Haleh Ardebili, University of Houston Impact of Interfacial Interactions Between rGO Sheets and ANFs Effect of Random Orientation of rGO/ANF Nanomaterials • An electrode of rGO sheets and ANFs in a randomly oriented • Carboxylic acid (-COOH) and amine (-NH 2 ) functionalized rGO sheets exhibited enhanced hydrogen bonding with ANFs house of cards (HOC) 3D structure was realized experimentally • Mechanical properties were improved because of • Micah insert finding regarding mechanics and hydrogen bonding ( 200% enhancement in strength , 33 electrochemical performance MPa vs. 100 MPa for rGO vs rGO-NH 2 /25wt%ANF) • 3D-models were developed to investigate the effect of “house of • Electrochemical properties were slightly diminished cards” architecture on ionic diffusivity because of defects introduced into rGO sheets • Ionic diffusion creates a compression stress throughout • Multifunctional efficiency shows a possible replacement for steel the geometry • Modeling is needed to understand interphase

Aramid Nanofiber-Functionalized Graphene Electrodes for Structural Load- Bearing Energy Storage AFOSR Grant No. FA9550-16-1-0230 Jodie L. Lutkenhaus, Dimitris Lagoudas, James Boyd, Micah Green, Texas A&M University 05/15/2016 – 05/14/2019 Haleh Ardebili, University of Houston Highlights of Future and Ongoing Work Electromechanical Coupling Effects - Induced Mechanical Stress • Data informatics approach to optimizing structural energy and • rGO/ANF “brick and mortar” electrode resistance was power determined under bending-induced strain • A utility function was developed that mixes and matches • Electrode could undergo either mechanical annealing or relevant energy and mechanical features mechanical deformation • Carbon nanotubes (CNTs) added to rGO/ANF electrodes are • Electromechanical model under development being explored • CNTs may enhance mechanical/electrical characteristics • Examine dopamine as an interfacial enhancer for mechanical properties • Multifunctional modeling to capture coupling and interrelationships of mechanical and electrochemical performance Products 1. Kwon, S.R., Harris, J., Zhou, T., Loufakis, D., Boyd, J.G., & Lutkenhaus, J.L., Mechanically Strong Graphene/Aramid Nanofiber Composite Electrodes Capacitors on a Kevlar Fiber Support for Structural Energy and Power. ACS Nano 11 (7), 6682-6690 (2017). • An electrode with reduced graphene oxide coated Kevlar threads 2. Kwon, S.R., Elinski, M.B., Batteas, J.D., & Lutkenhaus, J.L., Robust and was realized using sol-gel method experimentally Flexible Aramid Nanofiber/Graphene Layer-by-Layer Electrodes. ACS • The mechanical properties of Kevlar were retained, Applied Materials & Interfaces 9 (20), 17125-17135 (2017). capacitance was diminished 3. Parviz, D., Shah, S.A., Odom, M.G.B., Sun, W., Lutkenhaus, J.L., Green, M.J., “Tailored network formation in graphene oxide gels , Langmuir , accepted. 4. Aderyani, S., Flouda, P., Lutkenhaus, J., Ardebili, H., Architecture Influenced Ionic Diffusion in rGO/Aramid Nanofiber Structural Electrodes for Supercapacitors, Submitted . 5. Tianyang Zhou, James G. Boyd, Jodie L. Lutkenhaus, Dimitris C. Lagoudas, Micromechanics Modeling of the Elastic Moduli of ANF/rGO Nanocomposites, Submitted.