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Few-Layer Tellurium: Cathodic Exfoliation and Doping for Collaborative Hydrogen Evolution.

Weiran Zheng1, Yong Li1, Mengjie Liu1

  • 1Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China.

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Summary

A new cathodic exfoliation method produces 2D tellurium (Te) nanosheets for electrocatalysis. Transition metal doping, like platinum (Pt), enhances hydrogen evolution activity, outperforming even pure Pt at high overpotentials.

Keywords:
2D materialscathodic exfoliationhydrogen evolution reactionsurface modificationtellurium

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Two-dimensional (2D) tellurium (Te) shows promise as an electrocatalyst support due to its electron transport capabilities and active site hosting.
  • Scalable and controlled production of 2D Te materials remains a significant challenge for widespread application.

Purpose of the Study:

  • To develop a facile and efficient method for producing 2D Te nanosheets.
  • To enable simultaneous transition metal doping on the surface of Te nanosheets during production.
  • To investigate the enhanced electrocatalytic activity of doped Te nanosheets for hydrogen evolution.

Main Methods:

  • Cathodic exfoliation of tellurium crystals at low potential to yield Te nanosheets.
  • Simultaneous in situ doping of Te nanosheets with transition metal ions by adjusting electrolyte concentration.
  • In situ Raman spectroscopy and ex situ characterization techniques to analyze the exfoliation mechanism and material properties.

Main Results:

  • The cathodic exfoliation mechanism was elucidated, involving electrostatic repulsion of in situ generated ditelluride (Te22-) anions.
  • Metal ion anchoring to Te nanosheet surfaces was achieved, with tunable doping concentrations.
  • Metal-doped Te nanosheets demonstrated significantly enhanced hydrogen evolution reaction (HER) activity.
  • Platinum-doped Te nanosheets exhibited superior performance compared to polycrystalline platinum at high overpotentials.

Conclusions:

  • A novel cathodic exfoliation method provides an efficient route to produce doped 2D Te nanosheets.
  • The developed material exhibits excellent electrocatalytic activity for hydrogen production.
  • A collaborative mechanism involving Te22- and Pt active sites is proposed for enhanced hydrogen evolution.