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Title: Size dependence of photocatalytic hydrogen generation for CdTe quantum dots

Abstract

CdTe quantum dots (QDs) are attractive photosensitizers for photocatalytic proton reduction due to their broad absorbance profile that can extend from the ultraviolet to near-infrared regions, providing access to a larger portion of the solar spectrum than possible with analogous CdSe and CdS QD photosensitizers. Here, the photocatalytic hydrogen (H2) generation from various sizes of dihydrolipoic acid (DHLA)-capped CdTe QDs, ranging from 2.5 to 7.5 nm in diameter, and a molecular Ni-DHLA catalyst in aqueous solutions was evaluated, and an unusual size-dependent photocatalytic activity with CdTe QDs was observed. Under optimized conditions, using 3.4 nm CdTe-DHLA and a 1:20 ratio of QD/Ni-DHLA catalyst, as many as 38 000 turnover numbers (mol H2 per mol QD) were achieved. However, below this critical size, the H2 production efficiency decreased; this behavior is attributed to the rapid oxidation of the QD surface, resulting in detrimental surface trap states. These results are consistent with ultrafast transient absorption spectroscopic measurements, which suggest the presence of extremely fast charge-trapping processes in the oxidized CdTe-DHLA QDs. While fast electron transfer from CdTe-DHLA QDs is observed in the presence of the Ni-DHLA catalyst, the charge trapping processes occur on a competitive time scale, thus lowering the efficiency ofmore » the CdTe/Ni-DHLA H2 production system. Understanding rapid charge trapping in CdTe QDs may help suggest potential improvements for the overall CdTe photocatalytic system.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [2];  [2]; ORCiD logo [2]
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  1. Chinese Academy of Sciences (CAS), Sichuan (China)
  2. Univ. of Rochester, NY (United States)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1801530
Alternate Identifier(s):
OSTI ID: 1573113
Grant/Contract Number:  
SC0002106; FG02-09ER16121; DEFG02-09ER16121
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 151; Journal Issue: 17; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Physics

Citation Formats

Yin, Jiajia, Cogan, Nicole B., Burke, Rebeckah, Hou, Zhentao, Sowers, Kelly L., and Krauss, Todd D. Size dependence of photocatalytic hydrogen generation for CdTe quantum dots. United States: N. p., 2019. Web. doi:10.1063/1.5125000.
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Yin, Jiajia, Cogan, Nicole B., Burke, Rebeckah, Hou, Zhentao, Sowers, Kelly L., & Krauss, Todd D. Size dependence of photocatalytic hydrogen generation for CdTe quantum dots. United States. https://doi.org/10.1063/1.5125000
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Yin, Jiajia, Cogan, Nicole B., Burke, Rebeckah, Hou, Zhentao, Sowers, Kelly L., and Krauss, Todd D. Tue . "Size dependence of photocatalytic hydrogen generation for CdTe quantum dots". United States. https://doi.org/10.1063/1.5125000. https://www.osti.gov/servlets/purl/1801530.
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@article{osti_1801530,
title = {Size dependence of photocatalytic hydrogen generation for CdTe quantum dots},
author = {Yin, Jiajia and Cogan, Nicole B. and Burke, Rebeckah and Hou, Zhentao and Sowers, Kelly L. and Krauss, Todd D.},
abstractNote = {CdTe quantum dots (QDs) are attractive photosensitizers for photocatalytic proton reduction due to their broad absorbance profile that can extend from the ultraviolet to near-infrared regions, providing access to a larger portion of the solar spectrum than possible with analogous CdSe and CdS QD photosensitizers. Here, the photocatalytic hydrogen (H2) generation from various sizes of dihydrolipoic acid (DHLA)-capped CdTe QDs, ranging from 2.5 to 7.5 nm in diameter, and a molecular Ni-DHLA catalyst in aqueous solutions was evaluated, and an unusual size-dependent photocatalytic activity with CdTe QDs was observed. Under optimized conditions, using 3.4 nm CdTe-DHLA and a 1:20 ratio of QD/Ni-DHLA catalyst, as many as 38 000 turnover numbers (mol H2 per mol QD) were achieved. However, below this critical size, the H2 production efficiency decreased; this behavior is attributed to the rapid oxidation of the QD surface, resulting in detrimental surface trap states. These results are consistent with ultrafast transient absorption spectroscopic measurements, which suggest the presence of extremely fast charge-trapping processes in the oxidized CdTe-DHLA QDs. While fast electron transfer from CdTe-DHLA QDs is observed in the presence of the Ni-DHLA catalyst, the charge trapping processes occur on a competitive time scale, thus lowering the efficiency of the CdTe/Ni-DHLA H2 production system. Understanding rapid charge trapping in CdTe QDs may help suggest potential improvements for the overall CdTe photocatalytic system.},
doi = {10.1063/1.5125000},
journal = {Journal of Chemical Physics},
number = 17,
volume = 151,
place = {United States},
year = {Tue Nov 05 00:00:00 EST 2019},
month = {Tue Nov 05 00:00:00 EST 2019}
}
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https://doi.org/10.1063/1.5125000
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