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Pristine S,N-containing Mn-based metal organic framework nanorods enable efficient oxygen reduction electrocatalysis.

Shujun Chao1, Qingyun Xia1, Yingling Wang1

  • 1Key Laboratory of Medical Molecular Probes, School of Basic Medical Sciences, Xinxiang Medial University, Xinxiang 453003, P. R. China. chaoshujun1979@163.com.

Dalton Transactions (Cambridge, England : 2003)
|March 13, 2020
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Summary

This study synthesizes S,N-containing manganese metal-organic frameworks (MOFs) as direct electrocatalysts. The resulting 1D nanorods exhibit excellent oxygen reduction reaction (ORR) activity and stability, comparable to platinum/carbon (Pt/C).

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) possess unique physicochemical properties suitable for electrocatalysis.
  • Direct application of pristine MOFs as electrocatalysts remains challenging, with many studies using them as precursors.
  • Developing efficient, direct MOF-based electrocatalysts is crucial for energy conversion applications.

Purpose of the Study:

  • To synthesize S,N-containing manganese MOFs (Mn-MOFs) with controlled morphologies for direct electrocatalysis.
  • To investigate the influence of synthesis parameters (reaction time, anions) on Mn-MOF properties and oxygen reduction reaction (ORR) activity.
  • To evaluate the electrocatalytic performance of the optimized Mn-MOFs against commercial platinum/carbon (Pt/C).

Main Methods:

  • Hydrothermal synthesis using MnII, thiophene-2,5-dicarboxylate (Tdc), and 4,4'-bipyridine (4,4'-Bpy).
  • Systematic variation of reaction times (0, 2, 4 h) and anions (SO42-, Cl-, NO3-, CH3COO-).
  • Electrochemical characterization of synthesized Mn-MOFs for ORR activity, stability, and selectivity.

Main Results:

  • Uniform one-dimensional (1D) MnII[(Tdc)(4,4'-Bpy)]n nanorods were formed under specific conditions (MnSO4, 4 h reaction time).
  • These 1D nanorods demonstrated high ORR activity (onset potential 0.98 V, half-wave potential 0.78 V vs. RHE), comparable to Pt/C.
  • The Mn-MOF nanorods exhibited superior stability, methanol resistance, and ORR selectivity compared to Pt/C.

Conclusions:

  • Optimized hydrothermal synthesis yields highly efficient 1D Mn-MOF nanorods for direct electrocatalysis.
  • The 1D nanostructure facilitates electron/mass transport, enhancing ORR performance.
  • This study presents a viable strategy for fabricating advanced MOF-based catalysts for energy storage and conversion.