Aqueous Rechargeable Zn/ZnO Battery Based on Deposition/Dissolution Chemistry.

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Novel electrochemical regulation via deposition/dissolution reactions offers advantages for large-scale energy storage systems (ESSs).
• Developing high-performance electrodes is crucial for harnessing these advanced electrochemical processes.

Purpose of the Study:

• To investigate the potential of low-cost ZnO microsphere electrodes for aqueous rechargeable batteries (ARBs).
• To explore electrochemical deposition/dissolution mechanisms for energy storage using a reversible manganese oxidation reaction (MOR)/manganese reduction reaction (MRR).

Main Methods:

• Fabrication of ARBs utilizing ZnO microsphere electrodes.
• Electrochemical cycling in a mild aqueous electrolyte (2 M ZnSO4 and 0.2 M MnSO4).
• Analysis of charge/discharge mechanisms involving zinc basic sulfate formation/dissolution.

Main Results:

• The ZnO microsphere electrode facilitated a reversible manganese oxidation reaction (MOR) and manganese reduction reaction (MRR).
• The electrode system demonstrated harvestable and storable charge through electrochemical deposition/dissolution.
• The process was driven by the formation and dissolution of zinc basic sulfate in the electrolyte.

Conclusions:

• ZnO microsphere electrodes are effective for ARBs utilizing novel electrochemical deposition/dissolution mechanisms.
• The reversible MOR/MRR coupled with zinc basic sulfate chemistry offers a promising pathway for efficient energy storage.
• This approach presents a viable low-cost solution for large-scale energy storage applications.