scholarly journals Graphene Quantum Dots Improved “Caterpillar”-Like TiO2 for Highly Efficient Photocatalytic Hydrogen Production

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5354
Author(s):  
Jing Ma ◽  
Lihua Chu ◽  
Yanjiao Guo ◽  
Changxu Sun ◽  
Hao Yan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Energy Supply ◽  
Graphene Quantum Dots ◽  
Visible Region ◽  
Production Capacity ◽  
Highly Efficient ◽  
The World ◽  
Convenient Approach

Photocatalytic water splitting for hydrogen production via heterojunction provides a convenient approach to solve the world crises of energy supply. Herein, graphene quantum dots modified TiO2 hybrids (TiO2-GQDs) with a “caterpillar”-like structure exhibit stronger light absorption in the visible region and an enhanced hydrogen production capacity of about 3.5-fold compared to the pristine TiO2 caterpillar. These results inferred that the addition of GQDs drastically promotes the interfacial electron transfer from GQDs to TiO2 through C-O-Ti bonds via the bonding between oxygen vacancy sites in TiO2 and in-plane oxygen functional groups in GQDs. Using a “caterpillar”-like structure are expected to provide a new platform for the development of highly efficient solar-driven water splitting systems based on nanocomposite photocatalyst.

Colorimetric detection of cholesterol based on highly efficient peroxidase mimetic activity of graphene quantum dots

2015 ◽  
Vol 218 ◽  
pp. 42-50 ◽  
Author(s):  
Narsingh R. Nirala ◽  
Shiju Abraham ◽  
Vinod Kumar ◽  
Anushka Bansal ◽  
Anchal Srivastava ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colorimetric Detection ◽  
Graphene Quantum Dots ◽  
Highly Efficient ◽  
Peroxidase Mimetic

Graphene aerogel-supported and graphene quantum dots-modified γ-MnOOH nanotubes as a highly efficient electrocatalyst for oxygen reduction reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (49) ◽  
pp. 43116-43126 ◽  
Author(s):  
Yisi Liu ◽  
Wenzhang Li ◽  
Jie Li ◽  
Haibo Shen ◽  
Yaomin Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Graphene Quantum Dots ◽  
Three Dimensional ◽  
Reduction Reaction ◽  
Graphene Aerogel ◽  
3D Graphene ◽  
Highly Efficient

In this work, we demonstrate a facile strategy to synthesize a novel three-dimensional (3D) graphene aerogel-supported and graphene quantum dots-modified γ-MnOOH nanotubes as a highly efficient electrocatalyst.

Coupling NiCo catalysts with carbon quantum dots on hematite photoanodes for highly efficient oxygen evolution

2022 ◽  
Author(s):  
Yingpu Bi ◽  
Bin zhao ◽  
Chenchen Feng ◽  
Xiaojuan Huang ◽  
Yong Ding
Keyword(s):  
Quantum Dots ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Carbon Quantum Dots ◽  
Hole Transfer ◽  
Highly Efficient ◽  
Pec Water Splitting

Highly efficient hole transfer from photoanodes to oxygen evolution catalysts is crucial for solar photoelectrochemical (PEC) water splitting. Herein, we demonstrated the coupling of NiCo catalysts with carbon quantum dots...

Ag-Conjugated graphene quantum dots with blue light-enhanced singlet oxygen generation for ternary-mode highly-efficient antimicrobial therapy

2020 ◽  
Vol 8 (7) ◽  
pp. 1371-1382 ◽  
Author(s):  
Yunjian Yu ◽  
Lin Mei ◽  
Yanmei Shi ◽  
Xinge Zhang ◽  
Kesong Cheng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Singlet Oxygen ◽  
Blue Light ◽  
Silver Nanoparticle ◽  
Broad Spectrum ◽  
Antimicrobial Therapy ◽  
Graphene Quantum Dots ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Highly Efficient

A broad-spectrum antibacterial system was produced in which silver nanoparticle-conjugated graphene quantum dots were utilised as a blue light-enhanced nanotherapeutic for efficient ternary-mode antimicrobial therapy.

scholarly journals Inhibition of Photoconversion Activity in Self-Assembled ZnO-Graphene Quantum Dots Aggregated by 4-Aminophenol Used as a Linker

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2802 ◽  
Author(s):  
Kyu Seung Lee ◽  
Young Jae Park ◽  
Jaeho Shim ◽  
Guh-Hwan Lim ◽  
Sang-Youp Yim ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Visible Region ◽  
Photocurrent Density ◽  
Solvothermal Process ◽  
High Contribution ◽  
Photoluminescence Lifetime ◽  
Pec Cells ◽  
Calculated Average ◽  
Light Scattering Effect

The aggregation of zinc oxide nanoparticles leads to an increased absorbance in the ultraviolet-visible region by an induced light scattering effect. Herein, we demonstrate the inhibition of photoconversion activity in ZnO-graphene core-shell quantum dots (QD) (ZGQDs) agglomerated by 4-aminophenol (4-AP) used as a linker. The ZnO-graphene quantum dots (QD) aggregates (ZGAs) were synthesized using a facile solvothermal process. The ZGAs revealed an increased absorbance in the wavelengths between 350 and 750 nm as compared with the ZGQDs. Against expectation, the calculated average photoluminescence lifetime of ZGAs was 7.37 ns, which was 4.65 ns longer than that of ZGQDs and was mainly due to the high contribution of a slow (τ2, τ3) component by trapped carriers in the functional groups of graphene shells and 4-AP. The photoelectrochemical (PEC) cells and photodetectors (PDs) were fabricated to investigate the influence of ZGAs on the photoconversion activity. The photocurrent density of PEC cells with ZGAs was obtained as 0.04 mA/cm2 at 0.6 V, which was approximately 3.25 times lower than that of the ZGQDs. The rate constant value of the photodegradation value of rhodamine B was also decreased by around 1.4 times. Furthermore, the photoresponsivity of the PDs with ZGAs (1.54 μA·mW−1) was about 2.5 times as low as that of the PDs with ZGQDs (3.85 μA·mW−1). Consequently, it suggests that the device performances could be degraded by the inhibition phenomenon of the photoconversion activity in the ZGAs due to an increase of trap sites.

Two-dimensional dual carbon-coupled defective nickel quantum dots towards highly efficient overall water splitting

2019 ◽  
Vol 250 ◽  
pp. 213-223 ◽  
Author(s):  
Ziliang Chen ◽  
Hongbin Xu ◽  
Yuan Ha ◽  
Xuanyi Li ◽  
Miao Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Splitting ◽  
Two Dimensional ◽  
Highly Efficient ◽  
Overall Water Splitting
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