水溶液
氧化还原
电化学
碲
化学
阴极
锌
电解质
电池(电)
无机化学
储能
电极
物理化学
有机化学
功率(物理)
物理
量子力学
作者
Jinzhi Wang,Junzhe Du,Jingwen Zhao,Yantao Wang,Yue Tang,Guanglei Cui
标识
DOI:10.1021/acs.jpclett.1c02797
摘要
Progress toward practical rechargeable aqueous zinc (Zn) batteries is impeded by the low energy density. The use of tellurium (Te) cathodes featuring multielectron redox reactions offers one possible approach to mitigating this dilemma. However, the corresponding energy-storage mechanisms in aqueous electrolytes are not established yet. Here, we uncover a H+/Zn2+-involved sequential conversion reaction with 6e- transfer for Te-based cathodes, which accounts for the outstanding capacity (over 460 mAh g-1 at 50 mA g-1). Two distinct redox processes, corresponding to TeO2 ↔ Te and Te ↔ ZnTe, are explicitly revealed within the electrochemical window of routine aqueous Zn electrolytes. The mechanism elucidated here complements the understanding of energy-dense Te centers and propels the exploration of high-capacity electrodes for multivalent battery chemistries.
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