Figure 4.

a) LSV curves, b) Tafel slopes of different electrocatalysts toward OER, and c) their activities and kinetics compared with the reported Co‐based sulfides in the references. NSs, nanospheres; CP, carbon paper; NTs, nanotubes; NTAs, nanotube arrays; NCs, nanocubes; NWs, nanowires; NF, nickel foam; CC, carbon cloth; CNTs, carbon nanotubes; MBs, microboxes. d) LSV curves at 1600 rpm, e) Tafel slopes of different electrocatalysts toward ORR, and f) their activities and kinetics compared with the reported Co‐based sulfides in the references. N‐S‐HPC, nitrogen and sulfur co‐doped hollow porous carbon; NSC, nitrogen and sulfur co‐doped carbon; NSG, nitrogen and sulfur co‐doped graphene. g) Half of the capacitive current density difference at 1.3 V versus RHE as a function of scan rates, and h) Nyquist plots for CoS₂ SSs and N‐CoS₂ YSSs. i) Comparison of OER and ORR bifunctional activities in this work and the reported catalysts in the references. S‐G, sulfur‐doped graphene. The dotted lines show the ΔE at constant values.