Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 14, Issue 23, Pages 4315-4321Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201901319
Keywords
Ag nanoparticles; heterostructures; hydrogen evolution reaction; supercritical CO2 assisted exfoliation-oxidation; WO3-x nanosheets
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Funding
- National Natural Science Foundation of China [81701684]
- Science Foundation from Sci-Tech Office of Guangdong Province, China [2017A020215090]
- Science and Technology Foundation from Health and Family Planning commission of Guangdong Province, China [A2017299]
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Exploring advanced electrocatalysts for electrocatalytic hydrogen evolution is highly desired but remains a challenge due to the lack of an efficient preparation method and reasonable structural design. Herein, we deliberately designed novel Ag/WO3-x heterostructures through a supercritical CO2-assisted exfoliation-oxidation route and the subsequent loading of Ag nanoparticles. The ultrathin and oxygen vacancies-enriched WO3-x nanosheets are ideal substrates for loading Ag nanoparticles, which can largely increase the active site density and improve electron transport. Besides, the resultant WO3-x nanosheets with porous structure can form during the electrochemical cycling process induced by an electric field. As a result, the exquisite Ag/WO3-x heterostructures show an enhanced hydrogen evolution reaction (HER) activity with a low onset overpotential of approximate to 30 mV, a small Tafel slope of approximate to 40 mV dec(-1) at 10 mA cm(-2), and as well as long-term durability. This work sheds light on material design and preparation, and even opens up an avenue for the development of high-efficiency electrocatalysts.
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