Operando Evaluation of the Electrochemically Active Area in a Solid Oxide Fuel Cell Porous Electrode by Micro X-ray Absorption Spectroscopy.

ABSTRACT: An operando X-ray absorption spectroscopic technique, which enables us to measure X-ray absorption spectra with a position resolution of submicrometers at increased temperatures while controlling atmospheres and passing an electrical current through the specimen, was developed. By applying this technique, the electrochemically active area in a porous La_0.6Sr_0.4CoO_3-δ electrode for a solid oxide fuel cell (SOFC) was experimentally and directly evaluated for the first time. The characteristic length of the active area was approximately 1 μm from the electrode-electrolyte interface under a cathodic overpotential of 140 mV at 873 K under 10^-2 bar of P(O₂), although the investigated electrode was thicker than 50 μm. This demonstrated

SUBMITTER: Fujimaki Y 

PROVIDER: S-EPMC12451737 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature