RESEARCH / A0561
Unveiling the Electrolyte Cations Dependent Kinetics on CoOOH- Catalyzed Oxygen Evolution Reaction
Read the original paper · 10.1002/anie.202313886 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 3. XAS characterization and structural investigation of CoOOH M+. (a) XANES spectra at Co K-edge of Co foil, CoOOH and CoOOH M+. (b) Oxidation state of Co species obtained from Co K-edge XANES (three experimental repeats). (c) The Fourier-transformed k3-weighted EXAFS signals recorded for different CoOOH M+. (d) The fitting Co O bond length data of CoOOH M+ (with three experimental repeats). (e) Comparison of Co K-edge EXAFS WTs recorded for the CoOOH M+. The vertical dashed lines are drawn to guide the observation of the trend of the Co O bonds.
Figure 4. In situ spectroscopic analysis for CoOOH to evaluate the formation potential of active *O Co(IV) sites. (a) In situ Raman spectra and (d) in situ UV/Vis spectra of CoOOH catalyst under 1.0 M CsOH at different applied potentials; Comparison of the formation potential from *HO Co(III) to *O Co(IV) under 1.0 M LiOH, NaOH, KOH and CsOH according to (b–c) in situ Raman and (e–f) in situ UV/Vis results; (g) CV curves in the potential range of 1.10–1.65 V versus RHE of CoOOH under 1.0 M electrolyte with the presence of different cations. (h) Comprehensive integration of the formation potential from *HO Co(III) to *O Co(IV) in different electrolyte according to CV, in situ Raman and in situ UV/Vis results. (i) In situ XAS characterization of CoOOH under 1.0 M hydroxide electrolytes. The signal of CoOOH under CsOH electrolyte can not be collected because of the strong X-ray adsorption of CsOH.