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<p>Constructing hierarchical nanostructures with highly exposed surfaces is a promising strategy for developing advanced cathode materials in aqueous batteries. Herein, we employed a competitive coordination strategy to optimize the characteristics of nickel metal–organic framework (Ni-MOF). Specifically, the acetate ions were employed as precise regulators, exerting a distinct influence on the morphology of the Ni-MOF and leading to a structural transition from a block structure to a two-dimensional (2D) layered structure. The optimized Ni-MOF exhibits a unique superstructure composed of hierarchical 2D layers assembled into flower-like architectures. This distinctive superstructure increases the electrochemically active surface area of Ni-MOF (N-2) and provides abundant pathways for electron/ion transfer, thereby facilitating efficient electrochemical reactions. Remarkably, the assembled aqueous alkaline N-2//Zn battery demonstrated enhanced specific capacity (0.446&#xa0;mAh·cm<sup>−2</sup> at 1&#xa0;mA·cm<sup>−2</sup>) and excellent maximum energy/power density (0.789&#xa0;mWh·cm<sup>−2</sup>/17.262&#xa0;mW·cm<sup>−2</sup>). This work not only offers valuable insights into regulating MOF morphology, but also makes a contribution toward enhancing the application potential of MOFs in aqueous batteries.</p>

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Controllable morphological transformations of nickel metal–organic frameworks for nickel–zinc batteries

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Guang-Xun Zhang,
  • Hui Yang,
  • Wan-Chang Feng,
  • Qiu-Jing Wang,
  • Han-Yi Chen,
  • Mohsen Shakouri,
  • Song-Qing Chen,
  • Huan Pang

摘要

Constructing hierarchical nanostructures with highly exposed surfaces is a promising strategy for developing advanced cathode materials in aqueous batteries. Herein, we employed a competitive coordination strategy to optimize the characteristics of nickel metal–organic framework (Ni-MOF). Specifically, the acetate ions were employed as precise regulators, exerting a distinct influence on the morphology of the Ni-MOF and leading to a structural transition from a block structure to a two-dimensional (2D) layered structure. The optimized Ni-MOF exhibits a unique superstructure composed of hierarchical 2D layers assembled into flower-like architectures. This distinctive superstructure increases the electrochemically active surface area of Ni-MOF (N-2) and provides abundant pathways for electron/ion transfer, thereby facilitating efficient electrochemical reactions. Remarkably, the assembled aqueous alkaline N-2//Zn battery demonstrated enhanced specific capacity (0.446 mAh·cm−2 at 1 mA·cm−2) and excellent maximum energy/power density (0.789 mWh·cm−2/17.262 mW·cm−2). This work not only offers valuable insights into regulating MOF morphology, but also makes a contribution toward enhancing the application potential of MOFs in aqueous batteries.