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Carbon Quantum Dots as a Visible Light Sensitizer to Significantly Increase the Solar Water Splitting Performance of Bismuth Vanadate Photoanodes

Authors Ye, Kai-Hang HKUST affiliated (currently or previously).
Wang, Zilong HKUST affiliated (currently or previously)
Gu, Jiuwang
Xiao, Shuang HKUST affiliated (currently or previously)
Yuan, Yufei
Zhu, Yi
Zhang, Yuanming
Mai, Wenjie
Yang, Shihe View this author's profile
Issue Date 2017
Source Energy and Environmental Science , v. 10, (3), March 2017, p. 772-779
Summary Here, we demonstrate that carbon quantum dots (CQDs), as a low cost, chemically stable, and environmentally friendly photosensitizer, can dramatically broaden the light absorption range to the entire visible range. Consequently, the NiOOH/FeOOH/CQD/BiVO4 (NFCB) photoanode has achieved a remarkable photocurrent density of 5.99 mA cm(-2) at 1.23 V vs. RHE under AM 1.5G in KH2PO4 aqueous solution without a hole scavenger (pH = 7) and a record high applied bias photon-to-current efficiency of 2.29% at 0.6 V vs. RHE for BiVO4-based photoanodes. This novel NFCB photoanode could operate stably for 10 h with a Faraday efficiency of similar to 95%, demonstrating the great potential of using CQDs for solar water splitting.
ISSN 1754-5692
Language English
Format Article
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