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Unconventionally Layered CoTe2 and NiTe2 as Electrocatalysts for Hydrogen Evolution
Xinyi Chia1, Zdeněk Sofer2, Jan Luxa2
1Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
Layered cobalt ditelluride (CoTe1.8) and nickel ditelluride (NiTe2) show promise for electrochemical applications. These transition metal compounds exhibit excellent hydrogen evolution electrocatalyst properties, including low overpotentials and small Tafel slopes.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Transition metal ditellurides like CoTe2 and NiTe2 exhibit diverse crystal structures (marcasite, pyrite, CdI2-related) influenced by stoichiometry and synthesis.
- NiTe2 typically adopts the CdI2 structure, while CoTe2 forms a related structure with non-stoichiometric compositions (e.g., CoTe1.8) based on LiTiS2, featuring a polymeric cobalt network.
Purpose of the Study:
- Investigate the electrochemical and electrocatalytic properties of layered CoTe1.8 and NiTe2 phases.
- Highlight the potential of these less-studied layered transition metal ditellurides in electrochemical applications.
Main Methods:
- Synthesis and structural characterization of layered CoTe1.8 and NiTe2.
- Electrochemical performance evaluation, including hydrogen evolution reaction (HER) studies.
Main Results:
- Layered CoTe1.8 and NiTe2 exhibit characteristics of effective hydrogen evolution electrocatalysts.
- Demonstrated low overpotentials and small Tafel slopes, indicating efficient catalytic activity.
Conclusions:
- The study provides fundamental insights into the transition metal ditelluride family, specifically layered CoTe1.8 and NiTe2.
- These materials show significant promise for future applications in electrochemistry, particularly as hydrogen evolution electrocatalysts.
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