|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Materials for Energy Conversion and Storage 2022
||Effect of Transition Metal Doping on the Electrochemical Properties of B-site Doped Neodymium Nickelate for Reversible Solid Oxide Cells
||Ayesha Akter, Srikanth Gopalan
|On-Site Speaker (Planned)
Ruddlesden-Popper structures based on rare-earth nickelates are promising oxygen electrode materials due to their mixed ionic-electronic conductivity, high oxygen surface exchange and diffusion coefficients, good thermo-chemical stability and well-matched thermal expansion coefficients. However, B-site doping can further enhance oxygen surface exchange and transport in these materials through their influence on the defect chemistry of these materials, particularly the oxygen non-stoichiometry. In this work, transition metals (Co, Cu) have been doped into chosen rare-earth nickelate oxides, and effect of dopant concentration and its influence on electrode polarization has been studied using symmetrical cells. The best electrodes identified using symmetrical cells have been used as oxygen electrodes in complete reversible fuel cell/electrolyzer cells to examine their mode switching behavior. Distributed relaxation times (DRT) analysis of the impedance spectra has been conducted to obtain insights into reaction mechanisms and the rate limiting steps.
||Energy Conversion and Storage, High-Temperature Materials, Thin Films and Interfaces