The naturally sluggish redox kinetics and limited utilization associated with the sulfur conversion in Zn/S electrochemistry hinder its real application. Herein, we report an in-situ phase reconstruction strategy that activates the catalysis activity of vanadium oxides for invoking the redox-catalysis to manipulate reversible sulfur conversion. It was identified that the V2O3@C/S precursor derived from metal organic frameworks can be transformed into V2O5-m·nH2O@C/S by a facile electrochemical induction process. The vanadium oxides can realize a faster zinc ions storage process than sulfur components during the discharging, thereby the pre-zincified ZnxV2O5·nH2O behaves as a redox medium to catalyze the sulfur reduction via a spontaneous reaction (Znx+1V2O5 + S = ZnxV2O5 + ZnS, △G= -6.4 kJ mol-1). For the reverse battery recharging, the electrodeposited ZnS around the active sites can be easily activated and the facile Zn2+ transport between ZnxV2O5·nH2O and ZnS enables the reversible conversion of ZnS back to S (ZnxV2O5 + ZnS = Znx+1V2O5 + S, △G= -7.02 kJ mol-1). Accordingly, the composite cathode delivers a high capacity of 1630.7 mAh g-1 and maintains stable capacity retention after 150 cycles at 4 A g-1. The proposed redox catalysis effect shed light on the tunable Zn-S chemistry.

中文翻译：

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钒氧化物的重建相可实现氧化还原催化操纵的可逆硫转化，从而获得稳定的 Zn-S 电池


Zn/S 电化学中与硫转化相关的自然缓慢的氧化还原动力学和有限的利用阻碍了其实际应用。在此，我们报道了一种原位相重建策略，该策略激活氧化钒的催化活性，以调用氧化还原催化来操纵可逆硫转化。结果表明，由金属有机框架衍生的 V2O3@C/S 前驱体可以通过简单的电化学诱导过程转化为 V2O5-m·nH2O@C/S。在放电过程中，氧化钒可以实现比硫组分更快的锌离子储存过程，因此预锌化的 ZnxV2O5·nH2O 充当氧化还原介质，通过自发反应催化硫还原 （Znx+1V2O5 + S = ZnxV2O5 + ZnS， △G = -6.4 kJ mol-1）。对于反向电池充电，可以很容易地激活活性位点周围的电沉积 ZnS，并且 ZnxV2O5·nH2O 和 ZnS 之间的简单 Zn2+ 传输使 ZnS 可逆地转换回 S（ZnxV2O5 + ZnS = Znx+1V2O5 + S，△G= -7.02 kJ mol-1）。因此，复合阴极提供 1630.7 mAh g-1 的高容量，并在 4 A g-1 下循环 150 次后保持稳定的容量保持。所提出的氧化还原催化效应阐明了可调谐 Zn-S 化学。