scholarly journals In situ Synthesis of Reduced Graphene Oxide Supported Co Nanoparticles as Efficient Catalysts for Hydrogen Generation from NH3BH3

2014 ◽  
Vol 30 (6) ◽  
pp. 1180-1186 ◽  
Author(s):  
YANG Yu-Wen ◽  
◽  
FENG Gang ◽  
LU Zhang-Hui ◽  
HU Na ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Generation ◽  
Reduced Graphene ◽  
Co Nanoparticles

In situ Synthesis of Reduced Graphene Oxide Supported CoMo Nanoparticles as Efficient Catalysts for Hydrogen Generation from NH3BH3

2018 ◽  
Vol 232 (3) ◽  
pp. 431-443 ◽  
Author(s):  
Xigang Du ◽  
Yonghua Duan ◽  
Jun Zhang ◽  
Gang Mi
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Hydrogen Generation ◽  
Sodium Molybdate ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Reduced Graphene

AbstractCoMo nanoparticles (NPs) supported on reduced graphene oxide (RGO) were synthesized by a one-stepin situco-reduction of an aqueous solution of cobalt(II) chloride, sodium molybdate dihydrate and graphene oxide (GO) using NaBH4as the sole reductant under ambient conditions. The powder XRD, FTIR, EDS and TEM were employed to characterize the structure, size and composition of the CoMo/RGO catalysts. The as-synthesized Co0.9Mo0.1/RGO catalysts exhibited high catalytic activity for the hydrolytic dehydrogenation of ammonia borane (AB) at room temperature. The as-synthesized Co0.9Mo0.1/RGO nanocatalysts exhibited much higher catalytic activity than Co/RGO, Mo/RGO and the RGO-free Co0.9Mo0.1counterpart. Moreover, kinetic studies indicate that the catalytic hydrolysis of AB by Co0.9Mo0.1/RGO has first order kinetics with respect to the the catalyst concentration, but zero order kinetics with respect to the substrate concentration. The Co0.9Mo0.1/RGO catalyst has a turnover frequency (TOF) of 15.8 mol H2·(mol·Co0.9Mo0.1/RGO)−1·min−1at 25°C. Furthermore, the Co0.9Mo0.1/RGO show good recyclability for hydrogen generation from an aqueous solution of AB, which enables the practical reuse of the catalysts. Hence, this general method can be easily extended to the facile preparation of other RGO-based metallic systems.

scholarly journals Pd–Ni nanoparticles supported on reduced graphene oxides as catalysts for hydrogen generation from hydrazine

RSC Advances ◽  
2017 ◽  
Vol 7 (51) ◽  
pp. 32310-32315 ◽  
Author(s):  
Ya Chen ◽  
Ling Wang ◽  
Yanan Zhai ◽  
Heyin Chen ◽  
Yibo Dou ◽  
...  
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Generation ◽  
Ni Nanoparticles ◽  
Graphene Oxides ◽  
Reduced Graphene ◽  
Reduced Graphene Oxides

A composite material of Pd–Ni nanoparticles supported on reduced graphene oxide (Pd–Ni/rGO) has been synthesised via an in situ reduction of PdO/Ni(OH)2 nanoparticles on GO.

scholarly journals Epitaxial Crystallization of Poly(ε-caprolactone) on Reduced Graphene Oxide at a Low Shear Rate by In Situ SAXS/WAXD Methods

ACS Omega ◽  
2020 ◽  
Vol 5 (49) ◽  
pp. 31535-31542
Author(s):  
Weijun Miao ◽  
Feng Wu ◽  
Shiman Zhou ◽  
Guibin Yao ◽  
Yiguo Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Shear Rate ◽  
Reduced Graphene Oxide ◽  
Epitaxial Crystallization ◽  
Reduced Graphene ◽  
Low Shear

scholarly journals In-situ synthesis of Fe2O3/rGO using different hydrothermal methods as anode materials for lithium-ion batteries

2020 ◽  
Vol 59 (1) ◽  
pp. 477-487 ◽  
Author(s):  
Zhuang Liu ◽  
Haiyang Fu ◽  
Bo Gao ◽  
Yixuan Wang ◽  
Kui Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oleic Acid ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Anode Materials ◽  
Lithium Ion ◽  
In Situ Synthesis ◽  
Cycle Performance ◽  
Reduced Graphene

AbstractThis paper studies in-situ synthesis of Fe2O3/reduced graphene oxide (rGO) anode materials by different hydrothermal process.Scanning Electron Microscopy (SEM) analysis has found that different processes can control the morphology of graphene and Fe2O3. The morphologies of Fe2O3 prepared by the hydrothermal in-situ and oleic acid-assisted hydrothermal in-situ methods are mainly composed of fine spheres, while PVP assists The thermal in-situ law presents porous ellipsoids. Graphene exhibits typical folds and small lumps. X-ray diffraction analysis (XRD) analysis results show that Fe2O3/reduced graphene oxide (rGO) is generated in different ways. Also, the material has good crystallinity, and the crystal form of the iron oxide has not been changed after adding GO. It has been reduced, and a characteristic peak appears around 25°, indicating that a large amount of reduced graphene exists. The results of the electrochemical performance tests have found that the active materials prepared in different processes have different effects on the cycle performance of lithium ion batteries. By comprehensive comparison for these three processes, the electro-chemical performance of the Fe2O3/rGO prepared by the oleic acid-assisted hydrothermal method is best.

Chemically reduced graphene oxide-coated knitted fabric imparted conductivity and outstanding hydrophobicity

2021 ◽  
pp. 004051752199547
Author(s):  
Min Hou ◽  
Xinghua Hong ◽  
Yanjun Tang ◽  
Zimin Jin ◽  
Chengyan Zhu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Chemical Reduction ◽  
Knitted Fabric ◽  
Mesh Structure ◽  
Reduced Graphene ◽  
Chemically Reduced Graphene Oxide ◽  
Modified Hummers Method

Functionalized knitted fabric, as a kind of flexible, wearable, and waterproof material capable of conductivity, sensitivity and outstanding hydrophobicity, is valuable for multi-field applications. Herein, the reduced graphene oxide (RGO)-coated knitted fabric (polyester/spandex blended) is prepared, which involves the use of graphite oxide (GO) by modified Hummers method and in-situ chemical reduction with hydrazine hydrate. The treated fabric exhibits a high electrical conductivity (202.09 S/cm) and an outstanding hydrophobicity (140°). The outstanding hydrophobicity is associated with the morphology of the fabric and fiber with reference to pseudo-infiltration. These properties can withstand repeated bending and washing without serious deterioration, maintaining good electrical conductivity (35.70 S/cm) and contact angle (119.39°) after eight standard washing cycles. The material, which has RGO architecture and continuous loop mesh structure, can find wide use in smart garment applications.

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