期刊
CARBON
卷 167, 期 -, 页码 760-769出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.06.041
关键词
Graphene quantum dot (GQD); Covalent dye-sensitization; n-p ambipolar semiconductor; Metal free photocatalyst; Photocatalytic hydrogen evolution reaction (HER)
资金
- NRF - Ministry of Science, ICT and Future Planning [2017R1E1A1A01075372 [RIAM0417-20200051]]
- Brain Korea 21plus programme
Designing metal free photocatalyst for solar water splitting is an emerging field of research. Although graphene quantum dot (GQD) has been explored as a potential photocatalyst, their performance remains inherently limited by poor visible light absorption and p-type conductivity. To address this problem, we have covalently functionalized GQD with visible light active photosensitizer Rhodamine 123. It was found that this dye-sensitized GQD could make quite stabilized photocatalytic hydrogen evolution reaction (HER) under visible light irradiation, which is in striking contrast to the virtually inactive photocatalytic HER performance of control GQD without dye. Efficient photo-induced electron transfer from Rhodamine 123 to GQD and also the transformation of p type GQD to the n-p ambipolar semiconductor, both boosted by covalent bonding, are responsible for such high photocatalytic HER performance. Observation of negative photocurrent at zero bias voltage during transient photocurrent measurement, also suggests its promising potential in the metal free photocathode system to achieve photo electrochemical H-2 production. (C) 2020 Elsevier Ltd. All rights reserved.
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