Performance estimation by multiphase-field simulations and transmission-line modeling of nickel coarsening in FIB-SEM reconstructed Ni-YSZ SOFC anodes I: Influence of wetting angle

被引：12

作者：

Hoffrogge, Paul W. ^{[1
,4
]}

Schneider, Daniel ^{[1
,2
,3
,4
]}

Wankmueller, Florian ^{[4
]}

Meffert, Matthias ^{[4
]}

Gerthsen, Dagmar ^{[4
]}

Weber, Andre ^{[4
]}

Nestler, Britta ^{[1
,2
,4
]}

Wieler, Matthias ^{[4
,5
]}

机构：

[1] Karlsruhe Inst Technol KIT, Inst Appl Mat Microstruct Modelling & Simulat IAM, Kaiserstr 12, D-76131 Karlsruhe, Germany

[2] Karlsruhe Univ Appl Sci, Inst Digital Mat Sci IDM, Moltkestr 30, D-76133 Karlsruhe, Germany

[3] Karlsruhe Inst Technol KIT, Inst Appl Mat Electrochem Technol IAM ET, Kaiserstr 12, D-76131 Karlsruhe, Germany

[4] Karlsruhe Inst Technol KIT, Lab Electron Microscopy LEM, Kaiserstr 12, D-76131 Karlsruhe, Germany

[5] Robert Bosch GmbH, Computat Mat Engn CR ATC1, Robert Bosch Campus 1, D-71272 Renningen, Germany

来源：

JOURNAL OF POWER SOURCES | 2023年 / 570卷

关键词：

Solid-oxide Fuel Cells; Phase-field Modeling; Coarsening; Wetting; Diffusion; Degradation; OXIDE FUEL-CELL; GRAIN-GROWTH; ELECTRODES; IMPEDANCE; DEGRADATION; EVOLUTION; QUANTIFICATION; PREDICTION; ZIRCONIA; FIB/SEM;

D O I：

10.1016/j.jpowsour.2023.233031

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

FIB-SEM measurements of as-processed Ni-YSZ solid oxide fuel cell (SOFC) anodes are conducted. Based on the reconstructed volume as initial condition, multiphase-field simulations of nickel coarsening are performed to investigate the microstructure under operating conditions. The effect of the wettability of nickel on YSZ is discussed to span a possible range of different operating conditions. Effective properties including nickel particle size distributions, mean particle diameters, tortuosities and triple-phase boundary lengths (TPBL) serve as quantitative indicators for possible degradation and failure. The resulting data is used in a transmission -line model (TLM) to estimate anode performance and long-term stability. Generally, the simulations show that Ni coarsening at 750 degrees C takes place mainly in the first 100 hours. It is found that nickel coarsening is enhanced when nickel shows dewetting on YSZ. Among other findings, the TPBL decreases significantly during the simulations for all parameter sets and is insusceptible to variations in wetting angle. The TLM considers the reduction of TPBL as the main factor for degradation. Loss of nickel connectivity can lead to a further significant drop in anode performance occurring predominantly for low wettability of nickel on YSZ.

引用

页数：11