Hollow-porous nanospheres of ZnMn2O4 spinel: a high energy density cathode for rechargeable aqueous battery

Atin Pramanik, Shreyasi Chattopadhyay, Sandipan Maiti, Goutam De, Sourindra Mahanty

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Well-controlled hollow-porous nanostructures can provide enhanced charge storage capacity owing to the rapid diffusion of electrolyte ions into their interior. However, interface engineering of stable hollow-porous nanostructures with reversible faradaic reactions for efficient energy conversion/storage devices is still a challenge. Herein, we report solvothermal synthesis of spinel ZnMn2O4 with a hollow-porous spherical (ZMOHS) morphology. The formation mechanism of such a hierarchical nanostructure has been discussed. The ZMOHS exhibits a specific capacity of ~187 mAh g−1 at a current density of 2 A g−1 when tested as a faradaic electrode (vs Pt) for a rechargeable aqueous battery (RAB) in alkaline electrolyte. Furthermore, a full cell RAB constituting of ZMOHS//activated carbon (AC) demonstrates energy and power densities of ~215.7 Wh Kg−1 and ~1184.5 W kg−1 respectively, with ultra-long cycling stability (~106% capacitance retention after 10,000 cycles), making it a very promising material for next-generation energy storage device applications.
Original languageEnglish
Article number124373
JournalMaterials Chemistry and Physics
Early online date16 Feb 2021
Publication statusPublished - 15 Apr 2021


  • Ternary metal oxide
  • ZnMnO hollow sphere
  • Hydrothermal synthesis
  • Aqueous rechargeable battery
  • Electrochemical energy storage


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