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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method
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Defective Carbon Derived Using a Dissolution-Recrystallization Strategy for Oxygen Reduction Electrocatalysis.

Da Bi1, Nailu Shen1, Zeming Tang1

  • 1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Jiangjun Ave., Nanjing 210016, China.

ACS Applied Materials & Interfaces
|June 15, 2023
PubMed
Summary

Dopant-free defective carbon nanorods were synthesized using a simple dissolution-recrystallization strategy. These materials show excellent oxygen reduction reaction activity and potential for use in zinc-air batteries.

Keywords:
ZnO activationdefective carbondissolution-recrystallizationdopant-free carbon electrocatalystsoxygen reduction reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Dopant-free defective carbon electrocatalysts offer an environmentally friendly alternative to precious metal catalysts.
  • Synthesizing these carbons often requires harsh conditions, posing challenges for defect control and efficient utilization.
  • Developing simple methods for creating active defects is crucial for advancing this field.

Purpose of the Study:

  • To develop a facile synthesis strategy for dopant-free defective carbon electrocatalysts.
  • To synchronously control carbon defects and mass transfer channels.
  • To investigate the electrocatalytic performance of the synthesized materials for oxygen reduction reaction (ORR).

Main Methods:

  • A dissolution-recrystallization strategy was used to design Zn-MOF-74 precursors.
  • Rodlike Zn-MOF-74 precursors were directly carbonized to yield one-dimensional porous defective carbon nanorods (d-CNRs).
  • The morphology, structure, and surface area of the synthesized d-CNRs were characterized.

Main Results:

  • The synthesis yielded one-dimensional porous defective carbon nanorods (d-CNRs) with a unique pore-crack nested structure.
  • The d-CNRs exhibited a high specific surface area (2459 m²/g) with abundant defects and mesopores, acting as active sites for ORR.
  • The material demonstrated excellent ORR electrocatalytic activity and molecular selectivity, along with stable performance in zinc-air batteries for over 60 hours.

Conclusions:

  • The dissolution-recrystallization strategy provides a simple and controllable pathway for synthesizing dopant-free defective carbon electrocatalysts.
  • The synthesized d-CNRs show great promise as efficient and stable electrocatalysts for ORR and energy storage applications.
  • This approach overcomes the limitations of complex preparation conditions for high-performance dopant-free carbons.