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Efficient Electrocatalyst Nanoparticles from Upcycled Class II Capacitors.

Junhua Xu1,2, Daobin Liu1, Carmen Lee1

  • 1SCARCE Laboratory, Energy Research Institute @ NTU (ERI@N), Nanyang Technology University, Singapore 637553, Singapore.

Nanomaterials (Basel, Switzerland)
|August 12, 2022
PubMed
Summary
This summary is machine-generated.

This study upcycles electronic waste into efficient oxygen evolution reaction (OER) catalysts. Recovered NiFe hydroxide demonstrates superior OER performance compared to commercial ruthenium dioxide.

Keywords:
ceramic capacitorcircular economyelectrocatalysiselectronic wasteionic liquidlayered double hydroxideliquid-liquid extractionnanoparticlenickelre-userecycling

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Science

Background:

  • The oxygen evolution reaction (OER) is crucial for renewable energy but faces high energy barriers.
  • Efficient OER catalysts with low overpotential are essential for energy devices.
  • Electronic waste (E-waste) contains valuable transition metals suitable for catalysis.

Purpose of the Study:

  • To upcycle BaTiO3 multilayer ceramic capacitors from electronic waste.
  • To synthesize novel NiFe and NiCu hydroxide catalysts for OER.
  • To evaluate the catalytic performance of synthesized materials for OER.

Main Methods:

  • Utilized a green solvent extraction method with ionic liquid Aliquat® 336 and hydrochloric acid.
  • Recovered mixed Ni, Fe, and Cu cations from e-waste.
  • Synthesized NiFe hydroxide and NiCu hydroxide catalysts for OER.

Main Results:

  • NiFe hydroxide exhibited faster OER kinetics than NiCu hydroxide and commercial c-RuO2.
  • Synthesized NiFe hydroxide outperformed c-RuO2 in chronopotentiometry tests.
  • The study successfully demonstrated e-waste upcycling for catalyst synthesis.

Conclusions:

  • Upcycling e-waste provides a sustainable route to high-performance OER catalysts.
  • NiFe hydroxide derived from e-waste is a promising alternative to commercial catalysts.
  • This approach contributes to circular economy principles in materials science.