About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
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Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
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Presentation Title |
Role of Cations on High-Temperature Phase Evolution and Grain Growth of 2D Carbide MXenes and Their Electrocatalytic Properties |
Author(s) |
Kartik Nemani, Bibash Sapkota, Austin Vohrees, Brian Wyatt, Anupma Thakur, Nithin Chandran, Zachary Hood, Robert Klie, Babak Anasori |
On-Site Speaker (Planned) |
Kartik Nemani |
Abstract Scope |
MXenes are two-dimensional transition metal carbides,1 nm thick and a few micrometers in lateral size. Due to their excellent colloidal stabilities, they are perfect host materials for various charged moieties such as metal cations that can be anchored on MXenes via surface energy modifications. We investigate two cations, Na+ and Ca2+, anchored on Ti3C2TxMXene via electrostatic charge interaction. Upon heat treatment at 2000 oC, we observed that multivalent cations can lead to templated growth on MXenes with a strong crystal plane orientation. MXene films decorated with Ca2+ ions show textured growth along the (111) plane. We further evaluated the preferential orientation of grains, the grain growth behavior, morphology, and their role in the electrocatalytic performance of thin films. This investigation develops insights into grain growth mechanisms in 2D MXene-derived titanium carbide using SEM, STEM, XPS and EELs techniques, paving way for design strategies to develop active surfaces for various applications. |