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

Weiran Zheng; Yong Li; Mengjie Liu; Lawrence Yoon Suk Lee

doi:10.1002/smll.202007768

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

Weiran Zheng, Yong Li, Mengjie Liu, Lawrence Yoon Suk Lee^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

2D tellurium is a suitable electrocatalyst support that can assist electron transport while hosting active sites, yet its production remains challenging. Herein, a cathodic exfoliation method that can exfoliate Te crystal directly to Te nanosheets at low potential, also enabling simultaneous transition metal doping on Te nanosheet surface is presented. In situ Raman spectra and ex situ characterizations reveal that the cathodic exfoliation relies on the electrostatic repulsion between Te flakes covered with in situ generated ditelluride (Te₂²⁻) anions. The Te₂²⁻ anions can anchor metal ions to the surface, and the doping concentration can be tuned by adjusting the concentration of metal ion in the electrolyte. The metal-doped Te nanosheets exhibit highly improved hydrogen evolution activities. In particular, Pt-doped Te outperforms polycrystalline Pt at high overpotential. A collaborative hydrogen production mechanism via Volmer–Heyrovsky pathway is suggested: Te₂²⁻ adsorbs protons and assists the mass transfer to adjacent Pt atoms where the protons are reduced and released as hydrogen.

Original language	English
Article number	2007768
Journal	Small
Volume	17
Issue number	18
DOIs	https://doi.org/10.1002/smll.202007768
State	Published - 6 May 2021
Externally published	Yes

Keywords

2D materials
cathodic exfoliation
hydrogen evolution reaction
surface modification
tellurium

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/smll.202007768

Cite this

@article{4700dd1550ef43d9b50d032d3c15d37a,

title = "Few-Layer Tellurium: Cathodic Exfoliation and Doping for Collaborative Hydrogen Evolution",

abstract = "2D tellurium is a suitable electrocatalyst support that can assist electron transport while hosting active sites, yet its production remains challenging. Herein, a cathodic exfoliation method that can exfoliate Te crystal directly to Te nanosheets at low potential, also enabling simultaneous transition metal doping on Te nanosheet surface is presented. In situ Raman spectra and ex situ characterizations reveal that the cathodic exfoliation relies on the electrostatic repulsion between Te flakes covered with in situ generated ditelluride (Te22−) anions. The Te22− anions can anchor metal ions to the surface, and the doping concentration can be tuned by adjusting the concentration of metal ion in the electrolyte. The metal-doped Te nanosheets exhibit highly improved hydrogen evolution activities. In particular, Pt-doped Te outperforms polycrystalline Pt at high overpotential. A collaborative hydrogen production mechanism via Volmer–Heyrovsky pathway is suggested: Te22− adsorbs protons and assists the mass transfer to adjacent Pt atoms where the protons are reduced and released as hydrogen.",

keywords = "2D materials, cathodic exfoliation, hydrogen evolution reaction, surface modification, tellurium",

author = "Weiran Zheng and Yong Li and Mengjie Liu and Lee, {Lawrence Yoon Suk}",

note = "Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",

year = "2021",

month = may,

day = "6",

doi = "10.1002/smll.202007768",

language = "英语",

volume = "17",

journal = "Small",

issn = "1613-6810",

publisher = "Wiley-VCH Verlag",

number = "18",

}

TY - JOUR

T1 - Few-Layer Tellurium

T2 - Cathodic Exfoliation and Doping for Collaborative Hydrogen Evolution

AU - Zheng, Weiran

AU - Li, Yong

AU - Liu, Mengjie

AU - Lee, Lawrence Yoon Suk

PY - 2021/5/6

Y1 - 2021/5/6

N2 - 2D tellurium is a suitable electrocatalyst support that can assist electron transport while hosting active sites, yet its production remains challenging. Herein, a cathodic exfoliation method that can exfoliate Te crystal directly to Te nanosheets at low potential, also enabling simultaneous transition metal doping on Te nanosheet surface is presented. In situ Raman spectra and ex situ characterizations reveal that the cathodic exfoliation relies on the electrostatic repulsion between Te flakes covered with in situ generated ditelluride (Te22−) anions. The Te22− anions can anchor metal ions to the surface, and the doping concentration can be tuned by adjusting the concentration of metal ion in the electrolyte. The metal-doped Te nanosheets exhibit highly improved hydrogen evolution activities. In particular, Pt-doped Te outperforms polycrystalline Pt at high overpotential. A collaborative hydrogen production mechanism via Volmer–Heyrovsky pathway is suggested: Te22− adsorbs protons and assists the mass transfer to adjacent Pt atoms where the protons are reduced and released as hydrogen.

AB - 2D tellurium is a suitable electrocatalyst support that can assist electron transport while hosting active sites, yet its production remains challenging. Herein, a cathodic exfoliation method that can exfoliate Te crystal directly to Te nanosheets at low potential, also enabling simultaneous transition metal doping on Te nanosheet surface is presented. In situ Raman spectra and ex situ characterizations reveal that the cathodic exfoliation relies on the electrostatic repulsion between Te flakes covered with in situ generated ditelluride (Te22−) anions. The Te22− anions can anchor metal ions to the surface, and the doping concentration can be tuned by adjusting the concentration of metal ion in the electrolyte. The metal-doped Te nanosheets exhibit highly improved hydrogen evolution activities. In particular, Pt-doped Te outperforms polycrystalline Pt at high overpotential. A collaborative hydrogen production mechanism via Volmer–Heyrovsky pathway is suggested: Te22− adsorbs protons and assists the mass transfer to adjacent Pt atoms where the protons are reduced and released as hydrogen.

KW - 2D materials

KW - cathodic exfoliation

KW - hydrogen evolution reaction

KW - surface modification

KW - tellurium

UR - http://www.scopus.com/inward/record.url?scp=85102641931&partnerID=8YFLogxK

U2 - 10.1002/smll.202007768

DO - 10.1002/smll.202007768

M3 - 文章

C2 - 33738956

AN - SCOPUS:85102641931

SN - 1613-6810

VL - 17

JO - Small

JF - Small

IS - 18

M1 - 2007768

ER -

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

Abstract

Keywords

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this