Figure 4
HERFD–XANES spectra at the V K- and Bi LIII-edges (left and right panels, respectively) in open circuit conditions (green) and upon application of 1.85 V versus RHE potential (dashed red); the insets highlight the changes for the pre-edge of the V edge spectrum and for the rising edge of the Bi LIII-edge one. For both edges the difference curves (+1.85 V versus RHE applied potential minus OCP) are reported in blue and the corresponding ordinate is on the right. For the Bi LIII-edge spectrum the derivative of the OCP spectrum is also reported in orange. |