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Orientation-Adjustable Metal-Organic Framework Nanorods for Efficient Oxygen Evolution Reaction.

Zichen Xu1, Chia-Lin Yeh2, Yuanjuan Jiang1

  • 1State Key Laboratory of Fine Chemicals, Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian, Liaoning 116024, P. R. China.

ACS Applied Materials & Interfaces
|June 10, 2021
PubMed
Summary

Researchers developed orientation-adjustable metal-organic framework (MOF) nanorods on nickel foam. The aligned nanorods show superior performance for the oxygen evolution reaction (OER) due to enhanced active sites and charge transfer.

Keywords:
1D nanorodsmetal−organic frameworkorientationoxygen evolution reactionsolvent compositions

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are promising materials for catalysis.
  • Controlling the morphology and orientation of MOFs is crucial for optimizing their performance.
  • The oxygen evolution reaction (OER) is a key process in water splitting and energy conversion.

Purpose of the Study:

  • To develop orientation-adjustable metal-organic framework (MOF) nanorods on a nickel foam (NF) template.
  • To investigate the effect of nanorod orientation on OER activity.
  • To achieve highly efficient electrocatalysts for the oxygen evolution reaction.

Main Methods:

  • Synthesis of CoFe(dobpdc)-I to CoFe(dobpdc)-III MOF nanorods on a 3D nickel foam template.
  • Modulation of solvent composition to control nanorod orientation from disorganized to vertically aligned.
  • Electrochemical characterization of the MOF nanorods for OER performance evaluation.

Main Results:

  • Vertically aligned CoFe(dobpdc)-III MOF nanorods exhibited enhanced hydrophilicity, more exposed active sites, and improved interfacial charge transfer.
  • Achieved ultralow overpotentials for OER: 176 mV at 10 mA cm-2 and 240 mV at 300 mA cm-2 in 1.0 M KOH.
  • Demonstrated a record low overpotential of 204 mV at 10 mA cm-2 for CoFe MOF-based electrocatalysts and excellent performance at high current densities.

Conclusions:

  • A convenient method for straightening MOF nanorods on a template was established.
  • The developed CoFe(dobpdc)-III MOF nanorods show superior OER activity, making them promising electrocatalysts.
  • This work highlights the importance of controlled nanostructure orientation for efficient electrocatalysis.