2023
DOI: 10.1002/smll.202304916
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Rationally Designed ZnTe@C Nanowires with Superior Zinc Storage Performance for Aqueous Zn Batteries

Abstract: Te‐based materials with excellent electrical conductivity and ultra‐high volume specific capacity have attracted much attention for the cost‐efficient aqueous Zn batteries. However, the construction of functional structures with mild volume expansion and suppressed shuttle effects, enabling an expanded lifespan, is still a challenge for conversion‐type materials. Herein, the carbon‐coated zinc telluride nanowires (ZnTe@C NWs) are rationally designed as a high‐performance cathode material for aqueous Zn batteri… Show more

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Cited by 13 publications
(7 citation statements)
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“…All the pH values show a trend of first increasing and then decreasing with the prolonged soaking time when using different active materials, which could result from the dissolution of Te oxides and the inevitable Te oxidation by dissolved oxygen in the water. [15,24] The Nano-Te with a smaller diameter shows a more apparent pH drop than other samples, which could be caused by its larger contact area with water molecules. However, compared with that of ZS+ZC/ACN, the pH change of ZS+ZC/ACN/Glu is much smaller, especially in the first 10 min, implying the well-inhibited dissolution of Te oxides by Glu/Cl − co-additive.…”
Section: Resultsmentioning
confidence: 99%
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“…All the pH values show a trend of first increasing and then decreasing with the prolonged soaking time when using different active materials, which could result from the dissolution of Te oxides and the inevitable Te oxidation by dissolved oxygen in the water. [15,24] The Nano-Te with a smaller diameter shows a more apparent pH drop than other samples, which could be caused by its larger contact area with water molecules. However, compared with that of ZS+ZC/ACN, the pH change of ZS+ZC/ACN/Glu is much smaller, especially in the first 10 min, implying the well-inhibited dissolution of Te oxides by Glu/Cl − co-additive.…”
Section: Resultsmentioning
confidence: 99%
“…In ZS+ZC/ACN/Glu, during the charging process, the pH value on the cathode side drops sharply from 5.12 (Dis-0.2V) to 4.8 (Cha-1.24V) and subsequently to 4.65 (Cha-1.35V), which can be attributed to proton generation during the conversion from Te 0 to Te 4+ ; while in ZS+ZC/ACN, the pH value on the cathode side slowly decreases from 5.13 (Dis-0.2V) to 5.04 (Cha-1.24V), which could be caused by the dissolution and/or shuttling of 𝛾-TeO 2 phase. [15,24] Figure 5f,g shows the top-view SEM image of cycled Zn anodes of Zn‖Te batteries in different electrolytes. In ZS+ZC/ACN/Glu, the Zn anode displays a relatively smooth surface; while in ZS+ZC/ACN, substantial loose substances appear on the surface of the Zn anode, which could be associated with the shuttling of active materials.…”
Section: Resultsmentioning
confidence: 99%
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“…It is therefore reasonable that the reversible formation and decomposition of zinc hydroxide sulfate hydrates is observed in the ex situ XRD patterns (Figure S11) and SEM images (Figure S12). The partial irreversibility of the pH value may be due to the fact that a small amount of Te was not converted to TeO 2 during the charging process (as evidenced by the XRD result), thus hindering the H + regeneration [11e] . To evaluate the effects of the partially increased pH on the device reversibility, the electrochemical performance of n‐TeO 2 /C in the electrolyte with a pH value of 4.77 is shown in Figure S13.…”
Section: Figurementioning
confidence: 99%