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. 2024 Sep 17;11(42):2408869. doi: 10.1002/advs.202408869

Figure 4.

Figure 4

Trifunctional activity of Co3S4, Co3S4/MoS2, G‐Co3S4, and G‐SHELL electrocatalysts. a) ORR polarization curves at 1600 rpm in O2‐saturated 0.1 M KOH solution. The inset shows the cyclic voltammetry (CV) curves of G‐SHELL in an O2‐saturated 0.1 M KOH solution. b) ORR polarization curves of G‐SHELL at various rotating rates in rpm. c) K‐L plots (ω −1/2 vs j −1; ω and j are the angular rotation speed and the current density at a certain voltage) obtained from the ORR polarization curves of G‐SHELL. d) ORR performance histograms of the onset voltage (Eonset), and half‐wave potential (E1/2), and kinetic current density (jk). e) OER polarization curves at 1600 rpm in 1 M KOH and f) corresponding Tafel slopes. g) Electric double layer capacitances calculated from the slope of 1/2Δj‐scan rate plot. (Δj is the current density difference between anodic and cathodic currents at 1.025 V versus reversible hydrogen electrode (RHE) in Figure S22, Supporting Information). h) HER polarization curves at 1600 rpm in 1 M KOH and i) corresponding Tafel slopes. Chronopotentiometry‐based stability test of G‐SHELL and noble metal electrocatalyst for j) ORR, k) OER, and l) HER.