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Cyclic Voltammogram (C-V) curves of samples (a, b) Cu2Se and (c, d) β-Cu1.3Se under (a, c) dark and (b, d) light illumination. Insets (a, d): corresponding SEM images of electrodes made of copper selenide nano/microcrystals on ITO coated glass surface. Inset (c): Charge generated on electrode relative to the reference electrode from cycles (1) to (6) for β-Cu2Se and β-Cu1.3Se under dark and one sun enabled solar illumination.
