Fig. 1: Microstructure and operando XANES characterization. | Nature Communications

Fig. 1: Microstructure and operando XANES characterization.

From: Uncovering near-free platinum single-atom dynamics during electrochemical hydrogen evolution reaction

Fig. 1: Microstructure and operando XANES characterization.

a Atomic-resolution HAADF–STEM image of Pt1/N-C, showing that only Pt single atoms are present (marked by red circles). Length of scale bar is 2 nm. b Micromorphology and elemental mapping of Pt1/N-C. Length of scale bar is 200 nm. c N K-edge XANES spectra of N-C framework (before ALD) and Pt1/N-C (after ALD). d Three-dimensional profile plot of successive operando Pt L3-edge XANES spectra acquired in different conditions. e Selected XANES spectra in d at different applied voltages from the open-circuit condition to −0.07 V during HER, and the XANES data of the reference standards of Pt foil and PtO2. Inset, Magnified white-line peak and post-edge XANES region.

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