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October 13, 2022SmallOpen Access

Simultaneously Improved Surface and Bulk Participation of Evolved Perovskite Oxide for Boosting Oxygen Evolution Reaction Activity Using a Dynamic Cation Exchange Strategy

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Authors

JXJiao XieYGYang GaoGCGuichan Chen

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Overview

Experimental study demonstrates a tenfold boost in oxygen evolution activity via electrolyte iron cation exchange, highlighting a pathway for high-durability zinc-air batteries.

Key Points

  • To determine whether dynamic cation exchange using exogenous iron ions can simultaneously enhance surface catalytic activity and bulk lattice oxygen diffusion in perovskite oxide electrocatalysts.
  • Tested PrBa0.5Sr0.5Co2O5+δ electrocatalysts in 0.1 M KOH with and without 0.1 mM Fe3+ additives.
  • Evaluated catalytic durability over 10 hours at 10.0 mA cm^-2 and cycling stability across 500 charge-discharge cycles in zinc-air batteries.
  • Used experimental characterization and theoretical calculations to examine dynamic surface reconstruction and perovskite-hydr(oxy)oxide heterostructure formation.
  • PrBa0.5Sr0.5Co2O5+δ in 0.1 M KOH with 0.1 mM Fe3+ demonstrated a tenfold increase in oxygen evolution activity relative to Fe-free 0.1 M KOH.
  • The Fe-modified system achieved a Tafel slope of ≈50 mV dec^-1 and sustained continuous operation at 10.0 mA cm^-2 for 10 hours.
  • Zinc-air batteries incorporating the catalyst exhibited a narrow potential gap, high open-circuit voltage, and stable cycling for 500 cycles.

Cite This Study

Xie et al. (2022) studied this question.

synapsesocial.com/papers/6a71c391b5c1fe5ca9dfe4bfhttps://doi.org/10.1002/smll.202204109
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