標題: Nitrogen-Doped Graphene Quantum Dots for Remarkable Solar Hydrogen Production
作者: Tsai, Kai-An
Hsieh, Ping-Yen
Lai, Ting-Hsuan
Tsao, Chun-Wen
Pan, Hui
Lin, Yan-Gu
Hsu, Yung-Jung
交大名義發表
材料科學與工程學系
National Chiao Tung University
Department of Materials Science and Engineering
關鍵字: graphene quantum dots;nitrogen-doped;water splitting;solar hydrogen production;charge dynamics
公開日期: 22-Jun-2020
摘要: 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.
URI: http://dx.doi.org/10.1021/acsaem.0c00335
http://hdl.handle.net/11536/154990
ISSN: 2574-0962
DOI: 10.1021/acsaem.0c00335
期刊: ACS APPLIED ENERGY MATERIALS
Volume: 3
Issue: 6
起始頁: 5322
結束頁: 5332
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