Fig. shows representative absorbance spectra of ML-MoS2 from the hyperspectral imaging technique. Fig. shows additional experimental data from multiple samples and for multiple potential cycles. Regardless of the sample, the number of cycles, and the scan direction, we observed the following potential-dependent trends. First, the absorbance spectra at more positive potentials (light yellow trace in Fig. ) shows three distinct peaks at 655, 610, and 425 nm, which are attributed to the A, B, and C excitons, respectively. The A and B exciton peak intensities decrease and broaden with more negative potential (dark blue trace in Fig. ). On the other hand, the C exciton absorbance feature is essentially potentialindependent (Fig. ). Control experiments with bulk MoS2 material do not exhibit these dramatic spectral changes under the same electrochemical conditions (Fig. ).