Redox Stability Analysis of Co-Doped Barium Niobate Thin Films Via Cyclic Voltammetry

• DOI: 10.1149/ma2024-01372144mtgabs
• Publication Date: 2024-08-19T15:38:06Z
• Authors: Luke H Denoyer; Kannan Ramaiyan; Angelica Benavidez; Andre Santarosa F...; Fabio Coral Fonseca; Fernando H. Garzon
• Keywords: Barium

The electrochemical oxidative coupling of methane (E-OCM) to higher hydrocarbons, requires anodes that are stable under reducing conditions. We have previously demonstrated high activity with long term stability/durability for the perovskite anode BaMg 0.33 Nb 0.67-x Fe x O 3-δ (BMNF) while performing E-OCM 1 . Our group has also improved total conductivity and barium niobate perovskites via exchange Mg Ca (from 18 mS/cm -1 41 ), decreasing Goldschmidt tolerance factor below increased cubic structural stability 2 Perovskite metal oxide thin films can be produced well-defined thicknesses stoichiometries through pulsed laser deposition (PLD) 3 These utilized in cyclic voltammetry experiments on YSZ substrates further elucidate chemical oxygen sub-stoichiometry temperature SOFC/SOEC electrodes. Through application potentials electrode interest, voltage current responses correlated effective activities which reduction may occur. Usage this technique calcium iron doped (BaCa - BCNF) provides insights into thermochemical doping effects highly environments. BCNF film electrodes were characterized grazing incidence XRD XRF crystal structure composition. After initial characterization, performed a novel cell setup. show promise evaluating mechanisms operation providing details compositional changes loss References: (1) Denoyer, L. H.; Benavidez, A.; Garzon, F. Ramaiyan, K. P. Highly Stable Doped Barium Niobate Based Electrocatalysts Effective Electrochemical Coupling Methane Ethylene. Adv. Mater. Interfaces 2022 , 9 (27), 2200796. (2) K.; H. Role Dopants Fine-Tuning Electrical Catalytic Properties Perovskites Towards High-Temperature Electrolyzer Application. ECS Trans. 2023 111 (6), 1139. (3) Anh, D. T. V.; Olthuis, W.; Bergveld, Sensing Oxide La0.5Sr0.5CoO3−δ Obtained by Using Pulsed Laser Deposition. Sens. Actuators B Chem. 2004 103 (1), 165–168.