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Carbon quantum dots (CQDs) are a new class of carbon nanomaterials with sizes below 10 nm, and have gradually become a rising star in the nanocarbon family, due to their benign, abundant and inexpensive nature.The strong and tunable fluorescence of CQDs pushes their wide applications in catalysis, bio-imaging, optoelectronics, sensors and surface-enhanced Raman scatering.Recent study shows that the photoexcited CQDs are both excellent electron donors and electron acceptors.Such remarkable photoinduced electron transfer properties offer CQDs new opportunities to be used as a class ofphotoactive nanocatalysts.