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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Zinc-based aqueous batteries offer cost-effectiveness and safety but suffer from poor rechargeability due to zinc dendrite formation.
  • Dendrite growth is exacerbated by the competitive hydrogen evolution reaction (HER) and insulating side-product co-deposition, hindering zinc electrode performance.

Purpose of the Study:

  • To investigate the influence of substrate materials on zinc deposition kinetics and thermodynamics.
  • To develop a novel current collector that suppresses HER and promotes reversible zinc plating/stripping.

Main Methods:

  • Systematic investigation of substrate material effects on HER and zinc reduction.
  • Development and characterization of a multifunctional graphite-coated copper current collector.
  • Electrochemical performance testing of Zn//AC supercapacitors and Zn-MnO2 batteries.

Main Results:

  • The graphite-coated copper collector significantly suppressed HER and improved Zn deposition reversibility to 99.95%.
  • Aqueous Zn//AC supercapacitors achieved over 400,000 cycles.
  • High-areal-capacity Zn-MnO2 batteries demonstrated improved performance with a low N/P ratio.

Conclusions:

  • The developed substrate design effectively mitigates dendrite formation and enhances zinc utilization in aqueous systems.
  • This advancement paves the way for more durable and efficient zinc-based energy storage devices.