Fig. 1: Hydrogen intercalation of WO3.
From: Tailoring a local acid-like microenvironment for efficient neutral hydrogen evolution
a Schematic illustration of the hydrogen intercalation process of WO3 to form HxWO3. b Digital pictures of the WO3 working electrode before and after electrochemical hydrogenation. c UV–visible diffuse reflectance spectra of WO3 and HxWO3. d EPR signal of oxygen vacancies. e 1H NMR spectra of WO3 and HxWO3. f EIS Nyquist plots of different electrocatalysts measured at open circuit potential from 10 kHz to 0.01 Hz. g The pDOS curves of W d-bands of WO3 and HxWO3.
