Application of FIB-TOF-SIMS and FIB-SEM-EDX Methods for the Analysis of Element Mobility in Solid Oxide Fuel Cells

摘要

The solid oxide fuel cell single cells with porous Pr_(0.6)Sr_(0.4)CoO_(3-δ) and La_(0.6)Sr_(0.4)CoO_(3-δ) (PSCO, LSCO respectively) cathodes on compact Ce_(0.9)Gd_(0.1)O_(2-δ)|Zr_(0.85)Y_(0.15)O_(2-δ) or Ce_(0.9)Gd_(0.1)O_(2-δ)|Zr_(0.85)Y_(0.15)O_(2-δ) bi-layered electrolytes deposited onto Ni-Zr_(0.85)Y_(0.15)O_(2-δ) (Ni-ZYO) or Ni-Ce_(0.9)Gd_(0.1)O_(2-δ) (Ni-CGO) supporting anode were prepared for ion (element) mobility studies. Focused ion beam - time of flight -secondary ion mass spectrometry (FIB-TOF-SIMS) method in addition to FIB-SEM, SEM-EDX and XRD methods has been used for analysis of mass-transfer (interlayer diffusion) of cathode electrode elements, demonstrating that during PSCO and LSCO sintering at 1100°C on to CGO|ZYO or CGO|ZScO bilayered electrolyte, noticeable mass-transfer of Sr~(2+) cations through the partially microporous CGO has been verified using FIB-TOF-SIMS and SEM-EDX methods. The single cells have been additionally studied using cyclic voltammetry, electrochemical impedance and chronoamperometry methods and high power densities have been demonstrated.