Figure 4. Photoelectrochemical characterization of the WSe₂ thin films prepared by the SCSA and AC techniques.

(a) shows the linear scanning voltammetry (LSV) curves under intermittent illumination (1 sun, 100 mW cm^–2) for the bare films (top) and after Pt deposition (bottom). A horizontal axis corresponding to zero current is indicated for each curve. The incident-photon-to-current (IPCE) spectrum for the SCSA film is shown together with the optical absorptivity in b. (c) shows the chronoamperometric scan (at 0 V versus RHE) for the SCSA electrode under intermittent illumination.