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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
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A Nanosized CoNi Hydroxide@Hydroxysulfide Core-Shell Heterostructure for Enhanced Oxygen Evolution.

Bin Wang1, Cheng Tang1, Hao-Fan Wang1

  • 1Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 6, 2018
PubMed
Summary
This summary is machine-generated.

A novel core-shell catalyst featuring ultrathin cobalt-nickel hydroxide@hydroxysulfide shells was developed for efficient oxygen evolution reactions (OER). This design maximizes active site exposure, enhancing catalytic performance for future energy applications.

Keywords:
core-shell structureselectrocatalysisheterostructureshydroxysulfidesoxygen evolution reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Efficient oxygen evolution reaction (OER) electrocatalysts are crucial for energy technologies.
  • Non-precious metal catalysts are desirable for cost-effectiveness.
  • Core-shell heterostructures offer potential but often suffer from thick shells limiting active site exposure.

Purpose of the Study:

  • To develop a cost-effective and highly efficient OER electrocatalyst using a core-shell heterostructure.
  • To overcome the limitations of thick shells in conventional core-shell catalysts.
  • To investigate the performance of a nanosized CoNi hydroxide@hydroxysulfide core-shell heterostructure.

Main Methods:

  • Fabrication of a nanosized CoNi hydroxide@hydroxysulfide core-shell heterostructure.
  • Utilized an ethanol-modified surface sulfurization method for controlled synthesis.
  • Characterized the material's structure, electronic properties, and catalytic activity.

Main Results:

  • Successfully synthesized a core-shell heterostructure with an ultrathin shell (4 nm).
  • Achieved a low OER overpotential (274.0 mV at 10.0 mA cm⁻²), a low Tafel slope (45.0 mV dec⁻¹), and excellent long-term stability.
  • Demonstrated facilitated charge transfer, fully exposed active sites, and a strongly coupled heterointerface.

Conclusions:

  • The ultrathin CoNi hydroxide@hydroxysulfide core-shell heterostructure is a superior OER catalyst.
  • The synthetic strategy provides a new approach for designing advanced core-shell materials.
  • This work opens avenues for developing high-performance energy materials.