fig3
![Proton exchange membrane photoelectrochemical cell for water splitting under vapor feeding](https://image.oaes.cc/57de5165-b287-406e-aa25-345922893d8d/em4077.fig.3.jpg)
Figure 3. PEC splitting of water vapor using WO3 photoanode: (A) dependence of photocurrent response on the applied voltage and (B) time-dependent O2 production rate over the photoanode at an applied voltage of 1.2 V vs. cathode (wavelength: 453 nm, irradiance: