Phase‐Selective Syntheses of Cobalt Telluride Nanofleeces for Efficient Oxygen Evolution Catalysts

Cobalt‐based nanomaterials have been intensively explored as promising noble‐metal‐free oxygen evolution reaction (OER) electrocatalysts. Herein, we report phase‐selective syntheses of novel hierarchical CoTe2 and CoTe nanofleeces for efficient OER catalysts. The CoTe2 nanofleeces exhibited excellen...

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Published in:Angewandte Chemie International Edition 2017-06, Vol.56 (27), p.7769-7773
Main Authors: Gao, Qiang, Huang, Chuan‐Qi, Ju, Yi‐Ming, Gao, Min‐Rui, Liu, Jian‐Wei, An, Duo, Cui, Chun‐Hua, Zheng, Ya‐Rong, Li, Wei‐Xue, Yu, Shu‐Hong
Format: Article
Language:English
Subjects:
Catalysts
Chalcogenides
Cobalt
Density functional theory
electrocatalyst
Electrocatalysts
Evolution
hierarchical structure
Intermediates
Intermetallic compounds
Low cost
Metals
Nanomaterials
Nanotechnology
Oxygen
oxygen evolution reaction
Reaction intermediates
Ruthenium oxide
Tellurides
tellurium
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Summary:Cobalt‐based nanomaterials have been intensively explored as promising noble‐metal‐free oxygen evolution reaction (OER) electrocatalysts. Herein, we report phase‐selective syntheses of novel hierarchical CoTe2 and CoTe nanofleeces for efficient OER catalysts. The CoTe2 nanofleeces exhibited excellent electrocatalytic activity and stablity for OER in alkaline media. The CoTe2 catalyst exhibited superior OER activity compared to the CoTe catalyst, which is comparable to the state‐of‐the‐art RuO2 catalyst. Density functional theory calculations showed that the binding strength and lateral interaction of the reaction intermediates on CoTe2 and CoTe are essential for determining the overpotential required under different conditions. This study provides valuable insights for the rational design of noble‐metal‐free OER catalysts with high performance and low cost by use of Co‐based chalcogenides. Fleeced: Hierarchical CoTe2 nanofleeces were synthesized by using ultrathin Te nanowires as templates. They exhibited excellent electrocatalytic activity and stablity for the oxygen evolution reaction (OER) in alkaline media. The CoTe2 catalyst exhibited superior OER activity to the CoTe catalyst and was comparable to the state‐of‐the‐art RuO2 catalyst.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201701998