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(a) Nyquist diagrams of Ni/G-50 W, Ni/G-100 W, Ni/G-150 W, and Ni/G-200 W in 5 mM of K3[Fe(CN)6] and 0.1 M KCl. (b) Enlarged view of high-frequency region of (a). (c) Nyquist diagrams of Ni/G-100W after different periods of β-CD adsorption.
