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Cyclic voltammograms of DSNPs-GCE (at 100 mV/s) in a phosphate buffer solution (0.10M) at different pH level (range, 2.0 –12.0). The inset shows the plot of the formal potential, E0′, versus the pH. DSNPs-GCE = delphinidin silver nanoparticles modified glassy carbon electrode.
