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Nitrogen-Doped Graphene Quantum Dots for Remarkable Solar Hydrogen Production
Kai-An Tsai1,2; Ping-Yen Hsieh1; Ting-Hsuan Lai1; Chun-Wen Tsao1; Hui Pan3; Yan-Gu Lin2,4; Yung-Jung Hsu1,2,4
Source PublicationACS Applied Energy Materials

We synthesized nitrogen (N)-doped graphene quantum dots (N-GQDs) using a top-down hydrothermal cutting approach. The concentration of N dopants was readily controlled by adjusting the concentration of the N source of urea. When N dopants were incorporated into GQDs, visible absorption was induced by C-N bonds, which created another pathway for generating photoluminescence (PL). Time-resolved PL data revealed that the carrier lifetime of GQDs was increased upon doping with the optimized N concentration. The photoelectrochemical properties of N-GQDs toward water splitting were studied, and the results showed that 2N-GQDs prepared with 2 g of urea produced the highest photocurrent. The photocatalytic activity of 2N-GQDs powder photocatalyst for hydrogen production was also examined under AM 1.5G illumination, showing substantial enhancement over that of pristine GQDs. Electrochemical impedance spectroscopy data further revealed a significant improvement in charge dynamics and reaction kinetics and an increased carrier concentration as a result of N doping.

KeywordCharge Dynamics Graphene Quantum Dots Nitrogen-doped Solar Hydrogen Production Water Splitting
URLView the original
Indexed BySCIE
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000543715100028
Scopus ID2-s2.0-85087452146
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Cited Times [WOS]:16   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
Affiliation1.Department of Materials Science and Engineering,National Chiao Tung University,Hsinchu,1001 University Road,30010,Taiwan
2.National Synchrotron Radiation Research Center,Hsinchu,30076,Taiwan
3.University of Macau,Taipa,Avenida da Universidade,Macao
4.Center for Emergent Functional Matter Science,National Chiao Tung University,Hsinchu,30010,Taiwan
Recommended Citation
GB/T 7714
Kai-An Tsai,Ping-Yen Hsieh,Ting-Hsuan Lai,et al. Nitrogen-Doped Graphene Quantum Dots for Remarkable Solar Hydrogen Production[J]. ACS Applied Energy Materials,2020,3(6):5322-5332.
APA Kai-An Tsai,Ping-Yen Hsieh,Ting-Hsuan Lai,Chun-Wen Tsao,Hui Pan,Yan-Gu Lin,&Yung-Jung Hsu.(2020).Nitrogen-Doped Graphene Quantum Dots for Remarkable Solar Hydrogen Production.ACS Applied Energy Materials,3(6),5322-5332.
MLA Kai-An Tsai,et al."Nitrogen-Doped Graphene Quantum Dots for Remarkable Solar Hydrogen Production".ACS Applied Energy Materials 3.6(2020):5322-5332.
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