Fig. 3: Bifunctional catalytic behaviors of Li2S deposition and oxidation. | Nature Communications

Fig. 3: Bifunctional catalytic behaviors of Li2S deposition and oxidation.

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

Fig. 3

a–c Potentiostatic nucleation profiles of Li2S8 solution on the rGO, {Co4W18}+rGO, and {Co4W18}/rGO electrodes. The dark and light areas correspond to the reduction of Li2S8/Li2S6 and the Li2S deposition, respectively. The insets are the SEM images of electrodes after Li2S deposition. d LSV curves and Tafel plots of Li2S oxidation on the rGO, {Co4W18}+rGO, and {Co4W18}/rGO electrodes. e Schematic illustration of bifunctional catalytic effect for Li2S deposition and oxidation on the surface of {Co4W18}/rGO composites. f Energy profiles for Li2S → LiS + Li on rGO (blue line) and {Co4W18} (red line), respectively. The inserted pictures are the optimized structures of the initial state (IS), transition state (TS), and final state (FS).

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