Fig. 4: Sulfur redox kinetics under synergy strategy.
From: Optimizing potassium polysulfides for high performance potassium-sulfur batteries
a Multi-rate scan CV curves of KSBs employing WSA-W2C@NC/S, W2C@NC/S, and NC/S cathodes. b Gibbs free energy profiles of sulfur reduction processes on NC, W2C@NC, and WSA-W2C@NC hosts. c Energy profiles for K2S dissociation on WSA-W2C@NC, W2C@NC and NC. d Projected crystal orbital Hamilton population (pCOHP) diagrams of W‒S bonds linking K2S and WSA-W2C@NC, W2C@NC (insert shows ICOHP values). e Linear relationship of log (specific current) vs. log (scan rate) of peaks R3 and O1 for these three cathodes. f Tafel slope of peaks R3 and O1 derived from CV curves at 0.2 mV s−1. g Visual cells under different states employing WSA-W2C@NC/S, W2C@NC/S, NC/S cathodes and potassium foil anodes. h UV-vis spectra and the optical photos (inset) of visual cells employing different cathodes at the end of charge process. Source data are provided as a Source Data file.
