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Evoking ordered vacancies in metallic nanostructures toward a vacated Barlow packing for high-performance hydrogen evolution
- Source :
- Science Advances
- Publication Year :
- 2021
- Publisher :
- American Association for the Advancement of Science (AAAS), 2021.
-
Abstract
- Rh nanostructures composed of nanosheets embedded with nanodomains adopt vacated Barlow packing with ordered vacancies.<br />Metallic nanostructures are commonly densely packed into a few packing variants with slightly different atomic packing factors. The structural aspects and physicochemical properties related with the vacancies in such nanostructures are rarely explored because of lack of an effective way to control the introduction of vacancy sites. Highly voided metallic nanostructures with ordered vacancies are however energetically high lying and very difficult to synthesize. Here, we report a chemical method for synthesis of hierarchical Rh nanostructures (Rh NSs) composed of ultrathin nanosheets, composed of hexagonal close-packed structure embedded with nanodomains that adopt a vacated Barlow packing with ordered vacancies. The obtained Rh NSs exhibit remarkably enhanced electrocatalytic activity and stability toward the hydrogen evolution reaction (HER) in alkaline media. Theoretical calculations reveal that the exceptional electrocatalytic performance of Rh NSs originates from their unique vacancy structures, which facilitate the adsorption and dissociation of H2O in the HER.
- Subjects :
- Multidisciplinary
Nanostructure
Materials science
Hexagonal crystal system
Metallic nanostructures
Materials Science
Alkalinity
SciAdv r-articles
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Dissociation (chemistry)
0104 chemical sciences
Chemistry
Adsorption
Chemical physics
Vacancy defect
Chemistry [Science]
Hydrogen evolution
0210 nano-technology
Research Articles
Research Article
Hydrogen
Subjects
Details
- ISSN :
- 23752548
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Science Advances
- Accession number :
- edsair.doi.dedup.....1bceaf1df1dad723869a8ec00447026e