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Phase-Reconfiguration-Induced NiS/NiFe2 O4 Composite for Performance-Enhanced Zinc-Air Batteries.

Zhiyu Shao1, Qian Zhu1, Yu Sun2

  • 1State Key Laboratory of Inorganic Synthesis and Preparative, Chemistry Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun, 130012, China.

Advanced Materials (Deerfield Beach, Fla.)
|February 16, 2022
PubMed
Summary

A novel NiS/NiFe2O4 composite catalyst was synthesized using in situ phase reconstruction. This bifunctional catalyst demonstrates excellent performance in oxygen evolution and reduction reactions and zinc-air batteries.

Keywords:
Zn−air batteriesphase reconfigurationspinelvacancies

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Composite structures offer multiple functionalities.
  • In situ synthesis methods for composites require further development.
  • Developing bifunctional catalysts is crucial for energy applications.

Purpose of the Study:

  • To report a new NiS/NiFe2O4 composite synthesized via in situ phase reconstruction.
  • To investigate the catalytic activity of the composite for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR).
  • To evaluate the performance of the composite in zinc-air batteries (ZABs).

Main Methods:

  • Synthesis of NiS/NiFe2O4 composite via phase reconstruction.
  • X-ray absorption fine structure (XAFS) for structural analysis.
  • Electron energy loss spectroscopy (EELS) to identify interfaces.
  • Density functional theory (DFT) calculations for mechanistic insights.
  • Electrochemical measurements for OER, ORR, and ZAB performance.

Main Results:

  • Successful synthesis of NiS/NiFe2O4 composite with local metal-S coordination.
  • XAFS confirmed broken long-range order due to metal-S coordination.
  • EELS identified NiS/NiFe2O4 interfaces formed during plasma energy irradiation.
  • DFT calculations revealed in situ phase reconfiguration accelerates OER kinetics.
  • Achieved an OER overpotential of 230 mV at 10 mA cm-2 and an ORR half-wave potential of 0.81 V.
  • Demonstrated excellent ZAB performance with a power density of 148.5 mW cm-2.

Conclusions:

  • The study presents a new compositing strategy based on fast phase reconstruction.
  • The NiS/NiFe2O4 composite exhibits superior bifunctional catalytic activity.
  • This approach offers a promising route for developing advanced catalysts for energy conversion and storage.