Template-free synthesis of oxygen-containing ultrathin porous carbon quantum dots/g-C3N4 with superior photocatalytic activity for PPCPs remediation

2019 ◽  
Vol 6 (8) ◽  
pp. 2565-2576 ◽  
Author(s):  
Fengliang Wang ◽  
Yingfei Wang ◽  
Yuliang Wu ◽  
Dandan Wei ◽  
Lei Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Porous Carbon ◽  
Carbon Quantum Dots ◽  
Metal Free ◽  
Template Free ◽  
Polymeric Carbon ◽  
First Time

We report, for the first time, the fabrication of an oxygen-containing ultrathin porous carbon quantum dots/polymeric carbon nitrogen metal-free composite with a highly enhanced photoresponse.

Carbon Quantum Dots Derived N-Doped Porous Carbon Frameworks with High Electrocatalytic for Oxygen Reduction Reaction

NANO ◽  
2017 ◽  
Vol 12 (08) ◽  
pp. 1750093 ◽  
Author(s):  
Xuelian Li ◽  
Xuming Xue ◽  
Yongsheng Fu
Keyword(s):  
Quantum Dots ◽  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Carbon Quantum Dots ◽  
Reduction Reaction ◽  
Alkaline Electrolyte ◽  
Metal Free ◽  
Defect Sites

Developing low-cost, high-performance metal-free oxygen reduction reaction (ORR) catalysts for fuel cells is highly desirable but still full of challenges. In this study, nitrogen-doped three-dimensional (3D) porous carbon frameworks (NCFs) derived from zero-dimensional carbon quantum dots have been prepared by a simple one-step self-assembly technique. The resultant NCF-800 (carbonized at 800[Formula: see text]C) possesses unique 3D porous framework architecture, large specific surface area (171[Formula: see text]cm2 g[Formula: see text] and abundant defect sites. As a catalyst for ORR, the optimized NCF-800 displays a positive onset potential at 0.87[Formula: see text]V (versus reversible hydrogen electrode), which is roughly 60[Formula: see text]mV more negative than that of Pt/C (0.93[Formula: see text]V). Additionally, the NCF-800 exhibits long-term stability and strong endurance to methanol in alkaline electrolyte, which is much superior to those of Pt/C. Considering the outstanding activity of NCF-800, it can be worked as a prospective metal-free ORR catalyst for fuel cells in the future.

Fluorescence and photocatalytic activity of metal-free nitrogen-doped carbon quantum dots with varying nitrogen contents

2020 ◽  
Vol 531 ◽  
pp. 147344 ◽  
Author(s):  
Yingying Hu ◽  
Rentian Guan ◽  
Cong Zhang ◽  
Keying Zhang ◽  
Wenjing Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Nitrogen Doped Carbon ◽  
Nitrogen Contents

Green synthesis of fluorescent carbon quantum dots for the detection of mercury(ii) and glutathione

2018 ◽  
Vol 42 (8) ◽  
pp. 5814-5821 ◽  
Author(s):  
Daraksha Bano ◽  
Vijay Kumar ◽  
Vikas Kumar Singh ◽  
Syed Hadi Hasan
Keyword(s):  
Quantum Dots ◽  
Green Synthesis ◽  
Carbon Quantum Dots ◽  
First Time ◽  
Fluorescent Carbon

On–off–on detection of Hg2+ and GSH using green-synthesized CQDs from T. indica leaves for the first time.

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