Redox cycling induced Ni exsolution in Gd0.1Ce0.8Ni0.1O2 - (Sr0.9La0.1)0.9Ti0.9Ni0.1O3 composite solid oxide fuel cell anodes

X. Shen, T. Chen, S. R. Bishop, N. H. Perry, H. L. Tuller, K. Sasaki

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Oxide anodes composed of 60 wt% Gd0.1Ce0.8Ni0.1O2 (GDCN)- 40 wt% (Sr0.9La0.1)0.9Ti0.9Ni0.1O3 (SLTN) composites were prepared and tested on (ZrO2)0.89(Sc2O3)0.1(CeO2)0.01 (SSZ) electrolyte-supported SOFC cells utilizing a (La0.75Sr0.25)0.98MnO3 (LSM)-SSZ cathode, in 3%-humidified hydrogen fuel at 800 °C. Improved electrochemical performance was found compared to the cell using Ni-free 60 wt% Gd0.1Ce0.9O2 (GDC) - 40 wt % Sr0.9La0.1TiO3 (SLT) that was attributed to the exsolution of nano-sized Ni particles from the Ni-doped system. This exsolution process represents a simpler, more attractive method to improve performance than the more conventional but more complicated infiltration method for introducing catalytic nanoparticles. Redox cycling testing was performed to investigate the performance and structural stability of the Ni-doped GDC-SLT anode. The results indicated that the Ni exsolution and aggregation occurred while redox cycling proceeded, resulting in a gradually reduced anodic overvoltage. Symmetric cells with dense thin film Gd0.1Ce0.9-xNixO2 (x = 0, 0.05, 0.1, 0.15) electrodes were also tested, demonstrating lower area-specific resistances with increasing Ni content on the surface under reducing conditions. The steady improvement during redox cycling, despite Ni agglomeration, is related to the continuous increase in the overall Ni content on the anode surface, which may be enabled by kinetic limitations to Ni re-dissolving under oxidizing transients.

Original languageEnglish
Pages (from-to)122-130
Number of pages9
JournalJournal of Power Sources
Volume370
DOIs
Publication statusPublished - Dec 1 2017

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this