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Figure 4
(a) Schematic illustration of the working mechanism for operando XRD measurements. (b) Photograph of the experimental setup. (c) Evolution of XRD profiles of LiCoO2 by potentiostatic holding at stepwise increased potentials in 0.1 M KOH. New peaks emerge at 12.87° and 25.88° above 1.50 V versus RHE, as indicated by the red arrows. These peaks can be attributed to a new phase, K0.3CoO2(H2O)0.4 (ICSD 154037). (d) and (e) Enlarged views of (d) the new diffraction peak emerging at 2θ = 12.87° and (e) the (003) diffraction peak of LiCoO2 at 2θ = 18.84°. (f) Comparison of peak intensities versus electrode potentials for the newly appearing peak (pink) and the (003) diffraction peak of LiCoO2 (blue).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 5| September 2025| Pages 1272-1281
https://doi.org/10.1107/S1600577525005612
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