3D Microstructure Effects in Ni-YSZ Anodes: Influence of TPB Lengths on the Electrochemical Performance.

ABSTRACT: 3D microstructure-performance relationships in Ni-YSZ anodes for electrolyte-supported cells are investigated in terms of the correlation between the triple phase boundary (TPB) length and polarization resistance (R_pol). Three different Ni-YSZ anodes of varying microstructure are subjected to eight reduction-oxidation (redox) cycles at 950 °C. In general the TPB lengths correlate with anode performance. However, the quantitative results also show that there is no simplistic relationship between TPB and R_pol. The degradation mechanism strongly depends on the initial microstructure. Finer microstructures exhibit lower degradation rates of TPB and R_pol. In fine microstructures, TPB loss is found to be due to Ni coarsening, while in

SUBMITTER: Pecho OM 

PROVIDER: S-EPMC5455394 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature