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. 2022 Nov 23;123(1):379–444. doi: 10.1021/acs.chemrev.2c00495

Figure 61.

Figure 61

(a) Operando XANES spectra at the Co K-edge of Co1/PCN at different applied voltages (−0.04 V, −0.1 V and ex situ) during electrocatalytic HER together with the references CoO, Co3O4 and CoOOH. Inset is the magnified pre-edge XANES region, (b) normalized difference in XANES spectra, (c) average oxidation states of Co from the XANES spectra with standard deviation from 3 independent measurements, (d) FT k3-weighted EXAFS spectra (shaded region shows the variations in the peak and intensity), (e) 1st shell fitting of the EXAFS spectra with corresponding geometric configurations, and (f) proposed mechanism of HER. Adapted with permission from ref (414). Copyright 2018, Springer Nature.