Multifunctional Nitrogen‐Doped Carbon Nanodots for Photoluminescence, Sensor, and Visible‐Light‐Induced H₂ Production

Abstract

Herein, multifunctional N-doped carbon nanodots (NCNDs) were prepared through the one-step hydrothermal treatment of yeast. Results show that the NCNDs can be used as a new photocatalyst to drive the water-splitting reaction under UV light. Moreover, the NCNDs can efficiently catalyze the hydrogen evolution reaction. Under visible-light irradiation, Eosin Y-sensitized NCNDs exhibit excellent activity for hydrogen evolution. The hydrogen evolution rate of NCNDs (without any modification and co-catalyst) reaches 107.1 μmol h(-1) (2142 μmol g(-1) h(-1) ). When Pt is loaded on the NCNDs, the hydrogen evolution rate reaches 491.2 μmol h(-1) (9824 μmol g(-1) h(-1)) under visible-light irradiation. In addition, the NCNDs show excellent fluorescent properties and can be applied as a fluorescent probe for the sensitive and selective detection of Fe(3+) .

Biomass‐Derived Carbon Dots and Their Applications

“…reported a facile treatment of coriander leaves for preparing BCDs . Honey, black tea, egg white, papaya, goose feathers, and other diverse biomass are widely used to prepare carbon dots for iron ion detection . It is precisely because iron ions are widely studied that their detection limits are getting lower and lower.…”

“…[123] Honey, [108] black tea, [62] egg white, [38] papaya, [41] goose feathers, [21] and other diverse biomass are widely used to prepare carbon dots for iron ion detection. [32,92,[124][125][126] It is precisely because iron ions are widely studied that their detection limits are getting lower and lower. Liu et al [21] synthesized BCDs from goose feathers by a microwave-hydrothermal treatment.…”

Natural‐Product‐Derived Carbon Dots: From Natural Products to Functional Materials

“…Yang et al. have developed NCDs, obtained by hydrothermal treatment of yeast, as photocatalysts for hydrogen evolution from water under UV irradiation (Figure d) . The rate of hydrogen evolution catalyzed by the NCDs is 14.59 μmol g −1 h −1 , and the rate increases to 30.6 μmol g −1 h −1 if the NCDs are loaded with Pt (5 wt %).…”

“…Yang et al have developed NCDs, obtained by hydrothermalt reatment of yeast, as photocatalysts for hydrogen evolutionf rom water under UV irradiation (Figure 12 d). [117] The rate of hydrogen evolution catalyzed by the NCDs is 14.59 mmol g À1 h À1 ,a nd the rate increases to 30.6 mmol g À1 h À1 if the NCDs are loaded with Pt (5 wt %). The NCDs can be used as robust co-catalysts to catalyzeh ydrogen evolution, and in Eosin Ys ensitized NCD systems, the hydrogen evolution rate reaches 2142 mmol g À1 h À1 under visible light.…”

CQD-Based Composites as Visible-Light Active Photocatalysts for Purification of Water

“…Carbon quantum dots (CQDs) are a recently discovered class of carbon-based nanomaterials that are typically discrete, quasi-spherical, and less than 10 nm in size [1] (although CQDs of sizes >10 nm have been reported [2][3][4][5]). They are composed of sp 2 =sp 3 -hybridized carbon atoms, have various surface functional groups, and possess composition-dependent fluorescence.…”