Fig. 4: Operando spectroscopic characterizations and proposed OER catalytic mechanism. | Nature Communications

Fig. 4: Operando spectroscopic characterizations and proposed OER catalytic mechanism.

From: Utilizing ion leaching effects for achieving high oxygen-evolving performance on hybrid nanocomposite with self-optimized behaviors

Fig. 4

a Operando Co K-edge XANES spectra for pure BSCF and hybrid BSCF. b EPR results of samples before OER and after a short-time OER activation. c Operando Co K-edge EXAFS spectra for pure and hybrid BSCF samples (with phase correction). Operando soft XAS spectra at d Co-L3 and e O-K edges in FY mode. f Ex situ soft XAS spectra at Co-L3 and Ba-M5 edges in TEY mode. g Schematic presentations of proposed self-optimizing OER mechanism, where corner-sharing, edge-sharing, and face-sharing Co–Co/Fe metal sites show interatomic distances of 3.9, 2.9, and 2.4 Å, respectively. Single crystal EuCoO3 was used as the Co3+ standard for Co L3-edge spectra.

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