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Built-In Electric Field-Driven Ultrahigh-Rate K-Ion Storage via Heterostructure Engineering of Dual Tellurides Integrated with Ti~3~C~2~T~ x ~ MXene by Long Pan; Rongxiang Hu; Yuan Zhang; Dawei Sha; Xin Cao; Zhuoran Li; Yonggui Zhao; Jiangxiang Ding; Yaping Wang; ZhengMing Sun is a Engineering article available to read on EtoBox.
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## Abstract Exploiting high-rate anode materials with fast K^+^ diffusion is intriguing for the development of advanced potassium-ion batteries (KIBs) but remains unrealized. Here, heterostructure engineering is proposed to construct the dual transition metal tellurides (CoTe~2~/ZnTe), which are anchored onto two-dimensional (2D) Ti~3~C~2~T~__x__~ MXene nanosheets. Various theoretical modeling and experimental findings reveal that heterostructure engineering can regulate the electronic structures of CoTe~2~/ZnTe interfaces, improving K^+^ diffusion and adsorption. In addition, the different work functions between CoTe~2~/ZnTe induce a robust built-in electric field at the CoTe~2~/ZnTe interface, providing a strong driving force to facilitate charge transport. Moreover, the conductive and elastic Ti~3~C~2~T~__x__~ can effectively promote electrode conductivity and alleviate the volume change of CoTe~2~/ZnTe heterostructures upon cycling. Owing to these merits, the resulting CoTe~2~/ZnTe/Ti~3~C~2~T~__x__~ (CZT) exhibit excellent rate capability (137.0 mAh g^−1^ at 10 A g^−1^) and cycling stability (175.3 mAh g^−1^ after 4000 cycles at 3.0 A g^−1^, with a high capacity retention of 89
Who reads Built-In Electric Field-Driven Ultrahigh-Rate K-Ion Storage via Heterostructure Engineering of Dual Tellurides Integrated with Ti~3~C~2~T~ x ~ MXene?
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- Author
- Long Pan; Rongxiang Hu; Yuan Zhang; Dawei Sha; Xin Cao; Zhuoran Li; Yonggui Zhao; Jiangxiang Ding; Yaping Wang; ZhengMing Sun
- Publisher
- Springer Science and Business Media LLC
- Published
- 2023
- Field
- Engineering (Physical Sciences)