Fig. 4: Activation-energy profiles and kinetic analyses of sulfur redox reactions. | Nature Communications

Fig. 4: Activation-energy profiles and kinetic analyses of sulfur redox reactions.

From: Single-dispersed polyoxometalate clusters embedded on multilayer graphene as a bifunctional electrocatalyst for efficient Li-S batteries

Fig. 4

a Nyquist plots of {Co4W18}/rGO/S cathodes under different temperatures at 2.4 V. b Arrhenius plots showing the proportional relation between logarithmic values of the reciprocal of charge-transfer resistance and the reciprocal of the absolute temperatures for 2.7 V, 2.4 V, 2.1 V, and 1.8 V. c Activation-energy profiles for rGO/S and {Co4W18}/rGO/S cathodes at various potentials. Error bars derived from the standard deviation of three independent electrodes and the fitting error. d The fifth-cycle CV profiles of the rGO/S and {Co4W18}/rGO/S cathodes at a scan rate of 0.1 mV s−1. e, f Tafel plots calculated from the reduction peak at ~2.0 V and oxidation peak at ~2.4 V.

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