Unconventionally Layered CoTe2 and NiTe2 as Electrocatalysts for Hydrogen Evolution

Xinyi Chia; Zdeněk Sofer; Jan Luxa; Martin Pumera

doi:10.1002/chem.201702753

Unconventionally Layered CoTe₂ and NiTe₂ as Electrocatalysts for Hydrogen Evolution

Xinyi Chia, Zdeněk Sofer, Jan Luxa, Martin Pumera

Department of Chemical and Biomolecular Engineering

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

67 Citations (Scopus)

Abstract

Two members of the transition metal ditelluride family, CoTe₂ and NiTe₂, exist in multiple structures encompassing marcasite-, pyrite- and CdI₂ related structures. The allotrope modification is influenced by weak changes in stoichiometry and synthesis. It is crucial to emphasize that the CdI₂ structure type is manifested by NiTe₂ while the CoTe₂ adopts a related structure for a non-stoichiometric composition with ratio below 1:1.8. The obtained structure is based on LiTiS₂ which is derived from CdI₂ structure, however contains a polymeric cobalt network. Despite the atypical nature of their layered structure, layered phases of CoTe_1.8 and NiTe₂ are rarely cast into the spotlight. Here, layered CoTe_1.8 and NiTe₂ are investigated for their electrochemical and electrocatalytic properties. In electrocatalytic aspects, layered CoTe_1.8 and NiTe₂ demonstrate low overpotentials and small Tafel slopes that are quintessential features of hydrogen evolution electrocatalysts. These findings impart fundamental insights to the transition metal ditelluride family and affirm the prospective use of layered CoTe_1.8 and NiTe₂ in electrochemical applications.

Original language	English
Pages (from-to)	11719-11726
Number of pages	8
Journal	Chemistry - A European Journal
Volume	23
Issue number	48
DOIs	https://doi.org/10.1002/chem.201702753
Publication status	Published - 2017 Aug 25

Bibliographical note

Funding Information:
M.P. acknowledges funding from Ministry of Education (Singapore) from Tier 1 RGT1/13. Z.S. and J.L. were supported by Czech Science Foundation (GACR No. 17-11456S) and by specific university research (MSMT No. 20-SVV/2017). This work was created with the financial support of the Neuron Foundation for science support.

Publisher Copyright:
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

Catalysis
Organic Chemistry

Access to Document

10.1002/chem.201702753

Cite this

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title = "Unconventionally Layered CoTe2 and NiTe2 as Electrocatalysts for Hydrogen Evolution",

abstract = "Two members of the transition metal ditelluride family, CoTe2 and NiTe2, exist in multiple structures encompassing marcasite-, pyrite- and CdI2 related structures. The allotrope modification is influenced by weak changes in stoichiometry and synthesis. It is crucial to emphasize that the CdI2 structure type is manifested by NiTe2 while the CoTe2 adopts a related structure for a non-stoichiometric composition with ratio below 1:1.8. The obtained structure is based on LiTiS2 which is derived from CdI2 structure, however contains a polymeric cobalt network. Despite the atypical nature of their layered structure, layered phases of CoTe1.8 and NiTe2 are rarely cast into the spotlight. Here, layered CoTe1.8 and NiTe2 are investigated for their electrochemical and electrocatalytic properties. In electrocatalytic aspects, layered CoTe1.8 and NiTe2 demonstrate low overpotentials and small Tafel slopes that are quintessential features of hydrogen evolution electrocatalysts. These findings impart fundamental insights to the transition metal ditelluride family and affirm the prospective use of layered CoTe1.8 and NiTe2 in electrochemical applications.",

author = "Xinyi Chia and Zden{\v e}k Sofer and Jan Luxa and Martin Pumera",

note = "Funding Information: M.P. acknowledges funding from Ministry of Education (Singapore) from Tier 1 RGT1/13. Z.S. and J.L. were supported by Czech Science Foundation (GACR No. 17-11456S) and by specific university research (MSMT No. 20-SVV/2017). This work was created with the financial support of the Neuron Foundation for science support. Publisher Copyright: {\textcopyright} 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Chia, Xinyi

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AU - Pumera, Martin

N1 - Funding Information: M.P. acknowledges funding from Ministry of Education (Singapore) from Tier 1 RGT1/13. Z.S. and J.L. were supported by Czech Science Foundation (GACR No. 17-11456S) and by specific university research (MSMT No. 20-SVV/2017). This work was created with the financial support of the Neuron Foundation for science support. Publisher Copyright: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

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N2 - Two members of the transition metal ditelluride family, CoTe2 and NiTe2, exist in multiple structures encompassing marcasite-, pyrite- and CdI2 related structures. The allotrope modification is influenced by weak changes in stoichiometry and synthesis. It is crucial to emphasize that the CdI2 structure type is manifested by NiTe2 while the CoTe2 adopts a related structure for a non-stoichiometric composition with ratio below 1:1.8. The obtained structure is based on LiTiS2 which is derived from CdI2 structure, however contains a polymeric cobalt network. Despite the atypical nature of their layered structure, layered phases of CoTe1.8 and NiTe2 are rarely cast into the spotlight. Here, layered CoTe1.8 and NiTe2 are investigated for their electrochemical and electrocatalytic properties. In electrocatalytic aspects, layered CoTe1.8 and NiTe2 demonstrate low overpotentials and small Tafel slopes that are quintessential features of hydrogen evolution electrocatalysts. These findings impart fundamental insights to the transition metal ditelluride family and affirm the prospective use of layered CoTe1.8 and NiTe2 in electrochemical applications.

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