Fig. 4: Atomic-scale imaging of a Ni grain as a function of the O2-to-H2 ratio.
From: Operando analysis of a solid oxide fuel cell by environmental transmission electron microscopy
a Residual gas analyser (RGA) O2-to-H2 ratio (raw data, full line, and shifted forward in time by 180 seconds, dashed line), and open circuit voltage measured between the anode and cathode (raw and gaussian-filtered data). b–e High-resolution TEM images of the edge of a Ni grain at the critical steps of the reoxidation and reduction processes, and f–i Fourier-filtered magnified micrographs and corresponding FFTs taken from the dashed regions in b–e. The interface of the Ni grain, with a void or with the NiO scale, is marked by a dashed line in b–e.
