Fig. 2: Local pH measurements and catalytic behaviors of HxWO3.
From: Tailoring a local acid-like microenvironment for efficient neutral hydrogen evolution
a Schematic diagram of local acid-like microenvironment generation on HxWO3 cathode. b Measured pH values on HxWO3 and carbon cathode surfaces at different potentials, respectively. c The pH on HxWO3 and carbon cathode surfaces before and after removing bias (−0.7 VRHE). d HER polarization curves of HxWO3 grown on CFP with 95% iR compensation and (e) corresponding Tafel plots. f Free energy barriers of H–H coupling and H–H transfer in HxWO3. Note: error bars represent the standard deviation of three independent measurements.
