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Two, graphic guide

Figure 1. Schematic diagram of the preparation of S/MX@ZnS@Zn at different temperatures.

Figure 2. Schematic diagram of Zn deposited on (af) original Zn and (gl) S/MX@ZnS@Zn-350 anodes at a current density of 1 mA cm-2 and different deposition times (a, g) 0 h, (b, h) 1 h, (c, (i) 2 h, (d, j) 5 h, (e, k) 10 h, (f, l) 20h.

Figure 3. Preparation and characterization of S/MXene@MnO2. (a) Comprehensive plan of S/MXene@MnO2. (b) XRD spectra of MXene, MnO2 and S/MXene@MnO2, (c) Raman spectra and (d) XPS spectra. (e) (e) S 2p, (f) C 1s, (g) Ti 2p, (h) Mn 2p and (i) O 1s high-resolution XPS spectra. (j) Top view of S/MXene@ MnO2 and (k) cross-sectional SEM, (l) digital photo and (m, n) EDS element mapping.

Figure 4. A schematic diagram of a water rechargeable battery with S/MXene@MnO2 as the cathode and original zinc foil or S/MX@ZnS@Zn-350 as the anode.
3. Full text summary
In summary, a heterogeneous protective layer composed of electronically conductive sulfur-doped 3D MXene and ion-conductive ZnS is designed. The advantages of this layer can be summarized as (1) the simultaneous realization of sulfur doping and ZnS generation. (2) Sulfur-doped 3D MXene can effectively guide the uniformity of Zn electrodeposition by homogenizing the electric field distribution, reducing local current density and alleviating volume changes. (3) ZnS can promote the uniform distribution of Zn2+, accelerate the migration of Zn2+, and inhibit side reactions (passivation, corrosion, hydrogen evolution, etc.). (4) The protection interface has high stability in the ZnSO4 aqueous solution. By avoiding side reactions caused by the electrolyte and adjusting the electroplating/stripping behavior of Zn, the reversibility of the Zn anode is enhanced. Under the action of these synergistic effects, the zinc anode has significant rate performance and cycle stability of more than 1600 h. The relationship between the structure of the protective layer and the performance of the zinc anode is discussed. The high-rate, stable and flexible full battery also constructs an independent sulfur-doped MXene@ MnO2 cathode. This work provides ideas for the development of zinc metal anodes and other metal-based battery systems. This work can also guide the interface engineering of zinc metal anodes and other metal-based battery systems.
Article link:

https://doi.org/10.1021/acsnano.1c05934

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