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Origin for retained activity in Pr2NiO4 while undergoing substantial phase transformation in a long-term solid oxide cell operation

Journal Article · · Nano Energy
 [1];  [2];  [3];  [2]
  1. Univ. of South Carolina, Columbia, SC (United States); OSTI
  2. Univ. of South Carolina, Columbia, SC (United States); Univ. of Louisiana, Lafayette, LA (United States)
  3. Univ. of South Carolina, Columbia, SC (United States)
Pr2NiO4 (PNO) is a known active oxygen electrode for solid oxide cells but undergoes phase transformation at high temperatures. An in-situ synchrotron study on PNO electrodes show that phase transformation reaches nearly 100% in a long-term operation. Such significant phase transformation is expected to play a detrimental role on the cell performance. However, PNO retains the activity in an enduring operation. The origin for this dichotomy has remained obscure. Here, the aim of this article is to investigate the origin for retained activity and performance stability in PNO electrode. High-resolution transmission electron microcopy analysis shows the presence of a large number of nanoclusters (~ 5 nm) through the entire electrode bulk, which are localized in the 20–60 nm region. In-situ synchrotron studies show that those nanoclusters are nickelates that account for the retained activity during phase transformation.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Louisiana, Lafayette, LA (United States); Univ. of South Carolina, Columbia, SC (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; FE0023475; FE0032110
OSTI ID:
2418117
Alternate ID(s):
OSTI ID: 1885480
Journal Information:
Nano Energy, Journal Name: Nano Energy Journal Issue: PA Vol. 103; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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