Constructing 2D Sandwich‐like MOF/MXene Heterostructures for Durable and Fast Aqueous Zinc‐Ion Batteries

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Abstract
Two‐dimensional metal–organic frameworks (2D MOFs) can be used as the cathodes for high‐performance zinc‐ion battery due to their large one‐dimensional channels. However, the conventionally poor electrical conductivity and low structural stability hinder their advances. Herein, we report an alternately stacked MOF/MX heterostructure, exhibiting the 2D sandwich‐like structure with abundant active sites, improved electrical conductivity and exceptional structural stability. Ex situ characterizations and theoretical calculations reveal a reversible intercalation mechanism of zinc ions and high electrical conductivity in the 2D heterostructure. Electrochemical tests confirm excellent Zn2+migration kinetics and ideal pseudocapacitive behaviors. As a consequence, Cu‐HHTP/MX shows a superior rate performance (260.1 mAh g−1at 0.1 A g−1and 173.1 mAh g−1at 4 A g−1) and long‐term cycling stability of 92.5 % capacity retention over 1000 cycles at 4 A g−1.
Funding Information
  • National Natural Science Foundation of China (62175161/61835009/62127819/52073242/52102268)

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