High-performance Photoelectrochemical Hydrogen Production Using Asymmetric Quantum Dots
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F24%3A10254455" target="_blank" >RIV/61989100:27710/24:10254455 - isvavai.cz</a>
Result on the web
<a href="https://assets.researchsquare.com/files/rs-1965707/v1/8bbc43c0-5b3a-458c-8f6b-cde7f965c383.pdf?c=1689664913" target="_blank" >https://assets.researchsquare.com/files/rs-1965707/v1/8bbc43c0-5b3a-458c-8f6b-cde7f965c383.pdf?c=1689664913</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/adfm.202400580" target="_blank" >10.1002/adfm.202400580</a>
Alternative languages
Result language
angličtina
Original language name
High-performance Photoelectrochemical Hydrogen Production Using Asymmetric Quantum Dots
Original language description
Solar-driven photoelectrochemical (PEC) reactions using colloidal quantum dots (QDs) as photoabsorbers have shown great potential for the production of clean fuels. However, the low H2 evolution rate, consistent with low values of photocurrent density, and their limited operational stability are still the main obstacles. To address these challenges, the heterostructure engineering of asymmetric capsule-shaped CdSe/CdxZn1-xSe QDs with broad absorption and efficient charge extraction compared to pure-shell QDs is reported. By engineering the shell composition from pure ZnSe shells into CdxZn1-xSe gradient shells, the electron transfer rate increased from 4.0 x 107 s-1 to 32.7 x 107 s-1. Moreover, the capsule-shaped architecture enables more efficient spatial carrier separation, yielding a saturated current density of average of 25.4 mA cm-2 under AM 1.5 G one sun illumination. This value is the highest ever observed for QDs-based devices and comparable to the best-known Si-based devices, perovskite-based devices, and metal oxide-based devices. Furthermore, PEC devices based on heterostructured QDs maintained 96% of the initial current density after 2 h and 82% after 10 h under continuous illumination, respectively. The results represent a breakthrough in hydrogen production using heterostructured asymmetric QDs. Dual engineering of composition and morphology control of the QDs realize innovative asymmetric capsule-shaped CdSe/CdxZn1-xSe/ZnSe QDs.The electron transfer rate of such QDs improves over 8 times higher than pure-shell QDs.The as-fabricated TiO2/CdSe/CdxZn1-xSe/ZnSe QD-PEC system exhibits an excellent high photocurrent density of average 25.4 mA cm-2 under one sun power with quite stable performance. image
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10400 - Chemical sciences
Result continuities
Project
<a href="/en/project/EF16_019%2F0000853" target="_blank" >EF16_019/0000853: Institute of Environmental Technology - Excellent Research</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Advanced Functional Materials
ISSN
1616-301X
e-ISSN
1616-3028
Volume of the periodical
Neuveden
Issue of the periodical within the volume
JAN 2024
Country of publishing house
DE - GERMANY
Number of pages
12
Pages from-to
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UT code for WoS article
001153408900001
EID of the result in the Scopus database
2-s2.0-85183871607