Development of Advanced Nickelate-Based Oxygen Electrodes for Solid Oxide Cells

Abstract

The present work deals with the development of lanthanide nickelate based oxygen electrodes (Ln 2 NiO 4+δ , with Ln = Nd, La or Pr) as the oxygen electrode for solid oxide cells (SOCs) operating in both solid oxide fuel cell (SOFC) and solid oxide electrolysis (SOEC) modes. These compounds have been widely investigated as they present high oxygen diffusion properties, making them attractive as SOFC oxygen electrodes. However, the main drawback of these nickelate phases is their reactivity with standard YSZ (yttria stabilized zirconia) or CGO (cerium gadolinium oxide) electrolytes, as typical sintering temperatures are usually higher than 1000 ºC in order to get strong adhesion at the electrode/electrolyte interface. Two strategies will be employed to avoid the undesired reactivity: the direct formation of the nickelate phase into YSZ scaffolds by infiltration and the development of an active barrier layer.

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

“…446 Two strategies, including loading nickelates on a YSZ scaffold through infiltration and introducing an interlayer between the electrode and electrolyte, were proposed as solutions to this problem. 447 With Ln 2 NiO 4+δ exhibiting an electrochemical performance comparable to that of LSCF at 600−800 °C, 448 Pr 2 NiO 4+δ displays obviously better activity but simultaneously suffers from an inadequate chemical stability. 449,450 To realize a combination of their respective advantages, various amounts of Pr were doped into Ln 2 NiO 4+δ , 451,452 and a balance between performance and chemical stability was illustrated by Ln 1.5 Pr 0.5 NiO 4+δ , which resulted in a reduced cell polarization resistance of 0.1 Ω•cm 2 at 700 °C and showed stability for 1800 h of operation.…”

“…Despite a better oxygen surface exchange and diffusion performance compared to that of perovskite materials, severe degradation is also caused by the reactions between Ln 2 NiO 4+δ nickelates and many electrolyte materials, such as YSZ, during high temperature sintering . Two strategies, including loading nickelates on a YSZ scaffold through infiltration and introducing an interlayer between the electrode and electrolyte, were proposed as solutions to this problem …”

Mo modified Co3O4 nanosheets array by a rapid quenching strategy for efficient oxygen evolution electrocatalysis

“…to the scarcity and high costs of these noble metals, there has been an increasingly growing interest among researchers regarding the use of Earth-abundant elements for the development of efficient electrocatalysts for OER (Liu et al, 2020;Wang B. et al, 2018;Gong et al, 2018;Xu et al, 2018;Yu et al, 2019;Liu G. et al, 2019;Cai et al, 2019;Laguna-Bercero et al, 2019). Transition metal oxides, which contain variable valence metal oxidized redox couples, have recently been considered one promising alternative to noble-metal-based catalysts for efficient OER in alkaline media (Nai et al, 2017;Zheng et al, 2018;Li et al, 2018a;Li et al, 2018b).…”