Abstract
The edges of layered transition metal dichalcogenides (TMDs) are recognized as the active sites for electrocatalytic hydrogen evolution, therefore considerable efforts have been devoted to increasing the edge density of TMDs. Given that defect-enriched TMDs are synthesized at mild conditions, their low crystallinity normally results in poor electrochemical stability. Although high-temperature processing is efficient to achieve highly crystalline TMDs, which in turn leads to low electrocatalytic activity due to the loss of reactive defects and edge sites. In this work, defect-enriched WSe2 with high crystallinity was synthesized via a long-term ultrasonic treatment of crystalline WSe2 plates in ethanol. Few-layered WSe2 nanosheets (NSs) were firstly obtained by ultrasonication-assisted exfoliation of WSe2 plates, while island-like domains were subsequently formed under durable ultrasonication. The resultant defect-rich crystalline WSe2 NSs possessing large specific surface area, abundant active sites and high crystallinity exhibit superior electrocatalytic performance for hydrogen evolution reaction.
Translated title of the contribution | 富缺陷晶态WSe2纳米片:一种潜在的高效低成本析氢反应电催化剂 |
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Original language | English |
Pages (from-to) | 1196-1201 |
Number of pages | 6 |
Journal | Cailiao Daobao/Materials Reports |
Volume | 34 |
Issue number | 1 |
DOIs | |
State | Published - 10 Jan 2020 |
Keywords
- Electrocatalysis
- Hydrogen evolution reaction
- Hydrogen production
- Transition metal dichalcogenides
- Ultrasonic assisted exfoliation
- WSe nanosheets
- Water electrolysis