Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 15, Pages 24355-24364Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.06.217
Keywords
Ruddlesden-popper phase; Nd2NiO4+delta; Proton-conducting electrolyte; Electrochemical activity; Compatibility
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Funding
- Russian Foundation for Basic Research [18-38-20063]
- Council of the President of the Russian Federation [CPi-1413.2019.1]
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One of the main directions for the attainment of high-performance solid oxide electrochemical cells, including those based on proton-conducting electrolytes, consists in the rational engineering of functional materials. Herein, we examine the use of Nd2-xBaxNiO4+delta (NBNx, 0 <= x <= 0.4) materials as potential oxygen electrodes for protonic ceramic fuel cells (PCFCs) based on conventional Ba(Ce,Zr)O-3-electrolytes. A Ba-doping strategy is proposed for Nd2NiO4+delta for reducing chemical interdiffusion of barium-ions from electrolyte to electrode during long-term operation. It is experimentally confirmed that a moderate Ba-content is beneficial in terms of reducing the quantity of impurity phases formed at the NBNx/Ba(Ce,Zr)O-3 interface during deliberately-imposed extreme temperature conditions (1250 degrees C for 20 h). In addition, materials with x = 0.1 and 0.2 exhibit the highest electrical conductivity with no adverse effects on their thermomechanical properties. Thus, when characterising symmetrical cells in wet air conditions, NBN0.1 and NBN0.2 electrodes demonstrates lower polarisation resistances (down to 1.7 Omega cm(2) at 700 degrees C) compared with NBN0, NBN0.3 and NBN0.4 electrodes. Based on these findings, the Ba-doping of nickelates can be recommended as a promising modification for the design of electrodes having good performance and chemical compatibility.
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