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Meeting Materials Science & Technology 2020
Symposium Functional Defects in Electroceramic Materials
Presentation Title Energetic Compromise for Achieving “Redox-Site-Rich” in Pseudocapacitive Energy Storage Materials: A Case Study of Nickel – aluminum Layered Double Hydroxides
Author(s) Xianghui Zhang, Cody Cockreham, Su Ha, Hongwu Xu, Di Wu
On-Site Speaker (Planned) Di Wu
Abstract Scope Compositional modification by increasing concentration of redox site is effective to tune the energy density and enhance the performance of pseudocapacitive materials. Here, I report our recent study on the structure-energetics-performance relationships of nickel–aluminum layered double hydroxides (NiAl-LDHs) as a function of Ni/Al ratio. Specifically, increase of Ni/Al ratio results in expanded van der Waals gap, which leads to fast charge–discharge kinetics, degraded crystallinity, and high cycling stability. In addition, using acid solution calorimetry, in situ XRD, and in situ DRIFTS, we figure out that increase of Ni/Al ratio leads to energetically less stable as-made (hydrated) and dehydrated NiAl-LDHs, supported by experimentally measured formation enthalpies. Moreover, the highest specific capacity observed, 2128 F/g at 1 A/g, is owing to effective hydration that energetically stabilizes the Ni redox sites, solvates carbonate ions, and fills interlayer space, in other words, paying for the “energetic cost” of being “redox site rich”.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Co-doping Strategies for Controlling Electrical Conductivity of BaTiO3 Ceramics
Defects Engineering in Epitaxial Complex Oxides for Designed Functionality
Design of Functional Decompositions for Solid State Batteries
Designing Optimal Defect Environments for High Ionic Conductivity and Surface Catalytic Reactions
Energetic Compromise for Achieving “Redox-Site-Rich” in Pseudocapacitive Energy Storage Materials: A Case Study of Nickel – aluminum Layered Double Hydroxides
Energetic Landscape of Functionally Modified 2D Nano-ceramics for Energy Storage
Formation of Two-dimensional Heterointerface in Layered Oxides for Improved Electrode Performance
Functional Defects by Design in Energy and Quantum Materials
Structure and Energetics of Point Defects in Titanium Dioxide
Thermodynamic Insights into Engineering 2D Nano-ceramics Towards Powering Portable Electronic Devices

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