Abstract
Hybrid Zn–air and Zn–M (M represents transition metal oxide/hydroxide) batteries combined at the cell level take the advantages of Zn–air high-capacity and Zn–M high cell voltage. However, the performance of a Zn–air/M battery relies on finding a dual-functional cathode material, which can effectively serve both battery's chemistries. Here, we demonstrate the superior performance of a hybrid battery cathode based on Fe-doped Ni double hydroxide nanoflakes and activated carbon material. Fe doping transforms the disordered crystal structure of Ni hydroxide to a stable hydrotalcite-type structure with significantly enhanced redox conversion capacity, improved electric conductivity, and superior oxygen evolution reaction activity. Therefore, the hybrid battery exhibits a high total energy density, unprecedented energy conversion efficiency (87% at 4 mA/cm 2), and superior power density (100 mW/cm 2 at 60 mA/cm 2) that outperform reported hybrid batteries of other cathode materials. Moreover, the hybrid Zn–air/Ni 1−xFe x–layered double hydroxide battery is featured with the capability of high-rate charging owing to the rapid kinetics of the redox reactions and the excellent catalytic activity of the cathode materials.
Original language | English |
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Article number | 100879 |
Number of pages | 8 |
Journal | Materials Today Energy |
Volume | 22 |
Early online date | 11 Oct 2021 |
DOIs | |
Publication status | Published (in print/issue) - 31 Dec 2021 |
Bibliographical note
Funding Information:This work was supported by EPSRC (awards n. EP/M024938/1 and n. EP/M015211/1 ).
Publisher Copyright:
© 2021 Elsevier Ltd
Keywords
- Hybrid zinc battery
- Layered double hydroxide
- Nickel hydroxide
- Zinc battery