Figure 1: Schematic illustration of the formation process of NiCo2S4 ball-in-ball hollow spheres. | Nature Communications

Figure 1: Schematic illustration of the formation process of NiCo2S4 ball-in-ball hollow spheres.

From: Formation of nickel cobalt sulfide ball-in-ball hollow spheres with enhanced electrochemical pseudocapacitive properties

Figure 1

Stage I, surface NiCo2S4 formed by anion exchange method. Stage II, further diffusion of S2− and formation of NiCo2S4 on the inner NiCo-glycerate core. Stage III, completion of the anion exchange reaction. M2+ refers to metal cations including Ni2+ and Co2+ ions.

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