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2D High-Entropy Hydrotalcites.

Xiwen Yu1, Bing Wang1,2, Cheng Wang1

  • 1Eco-materials and Renewable Energy Research Center, College of Engneering and Applied Sciences, Nanjing University, Nanjing, Jiangsu, 210093, China.

Small (Weinheim an Der Bergstrasse, Germany)
|September 27, 2021
PubMed
Summary

Researchers developed novel 2D high-entropy hydrotalcites (HEHs) using a coprecipitation method. These 2D high-entropy materials (HEMs) exhibit enhanced performance as oxygen evolution reaction (OER) electrocatalysts due to lattice distortion.

Keywords:
2D materialshigh-entropy hydrotalcitesoxygen evolution reaction

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • High-entropy materials (HEMs) possess unique properties but 2D HEMs remain underexplored.
  • Hydrotalcites are a class of layered double hydroxides with potential applications.

Purpose of the Study:

  • To synthesize and characterize novel 2D high-entropy hydrotalcites (HEHs).
  • To investigate the potential of these 2D HEHs as electrocatalysts for the oxygen evolution reaction (OER).

Main Methods:

  • Coprecipitation method was employed to synthesize HEHs with quinary, septenary, and novenary metallic elements.
  • The synthesized materials were characterized for their structural and compositional properties.
  • Electrochemical performance, specifically for OER, was evaluated.

Main Results:

  • Successful synthesis of 2D HEHs, overcoming solubility limitations via fast kinetics.
  • HEHs demonstrated significantly decreased apparent activation energy for OER compared to low-entropy hydrotalcites (LEHs).
  • Lattice distortion in HEHs, induced by multimetallic composition, is responsible for enhanced OER activity.

Conclusions:

  • This study introduces a new class of 2D high-entropy materials (HEMs) based on hydrotalcites.
  • The developed 2D HEHs show great promise as efficient electrocatalysts for OER.
  • This work paves the way for exploring novel properties and applications of 2D HEMs.