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

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.

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Development of New Carbon-Based Electrode Material from Oil Palm Waste-Derived Reduced Graphene Oxide and Its Capacitive Performance Evaluation

Journal of Nanomaterials ◽

10.1155/2019/1970365 ◽

2019 ◽

Vol 2019 ◽

pp. 1-13

Author(s):

Salisu Nasir ◽

Mohd Zobir Hussein ◽

Zulkarnain Zainal ◽

Nor Azah Yusof

Keyword(s):

Graphene Oxide ◽

Specific Capacitance ◽

Reduced Graphene Oxide ◽

Oil Palm ◽

Palm Kernel ◽

Graphene Oxides ◽

Palm Kernel Shell ◽

Reduced Graphene ◽

Reduced Graphene Oxides ◽

Carbon Based

This paper is an expansion of our previous work on the synthesis of graphene oxides and reduced graphene oxides from different kinds of oil palm waste-based feedstocks, namely, OPL (oil palm leaf), PKS (palm kernel shell), and EFB (empty fruit bunch). Here, the electrochemical measurements of the resulting reduced graphene oxides derived via mild-temperature annealing reduction of the graphene oxides were accomplished using cyclic voltammetry and galvanostatic charge/discharge processes. The findings put forward their promising features for supercapacitor applications. For instance, the reduced graphene oxide derived using EFB precursor (rGOEFB) which has a BET surface area of 117 m2 g-1 exhibits a specific capacitance of 688 F g−1 at an applied current density of 0.8 A g-1. This is higher than that observed for reduced graphene oxides derived from oil palm leaf (rGOOPL), palm kernel shell (rGOPKS), and the commercially acquired graphite (rGOCG), which possessed specific capacitance values of 632, 424, and 220 F g−1, respectively. It can be deduced that the specific capacitance of the reduced graphene oxide samples increases in the following order: (rGOCG) < (rGOPKS) < (rGOOPL) < (rGOEFB). In summary, these new classes of carbon-based nanomaterials could be applied as efficient electrode materials for supercapacitor application with potential good performance. With this novel green and sustainable approach, various carbon-based nanomaterials can be fabricated for a broad range of multifunctional applications.

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

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2017-0993 ◽

2018 ◽

Vol 232 (3) ◽

pp. 431-443 ◽

Cited By ~ 10

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.

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

Acta Physico-Chimica Sinica ◽

10.3866/pku.whxb201404141 ◽

2014 ◽

Vol 30 (6) ◽

pp. 1180-1186 ◽

Cited By ~ 8

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

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The effect of varying carboxylic-group content in reduced graphene oxides on the anticorrosive properties of PMMA/reduced graphene oxide composites

eXPRESS Polymer Letters ◽

10.3144/expresspolymlett.2014.92 ◽

2014 ◽

Vol 8 (12) ◽

pp. 908-919 ◽

Cited By ~ 26

Author(s):

K. C. Chang ◽

W. F. Ji ◽

C. W. Li ◽

C. H. Chang ◽

Y. Y. Peng ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Carboxylic Group ◽

Graphene Oxides ◽

Group Content ◽

Reduced Graphene ◽

Reduced Graphene Oxides ◽

Oxide Composites

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Comparison of reduced graphene oxides synthesized chemically with different reducing agents for supercapacitors

Materials Testing ◽

10.1515/mt-2021-0045 ◽

2021 ◽

Vol 63 (12) ◽

pp. 1184-1190

Author(s):

Yifan Cui ◽

Rong Li ◽

Liuqin Lai ◽

Huimin Dai ◽

Siyu Su ◽

...

Keyword(s):

Graphene Oxide ◽

Electrochemical Performance ◽

Specific Capacitance ◽

Reduced Graphene Oxide ◽

Reference Sample ◽

Reducing Agents ◽

Carbon Cloth ◽

Graphene Oxides ◽

Reduced Graphene ◽

Reduced Graphene Oxides

Abstract The chemical reduction of graphene oxide is an effective method for the synthesis of reduced graphene oxide, having the obvious advantages of low cost and large scale applicability. Our work produced reduced graphene oxide through a simple water bath reduction approach using various reducing agents of N2H4 × H2O, NaBH4, Na2S2O3, HI, and a reference sample without reducing agent at the same reduction temperature and duration time, by which reduced graphene oxides represented as N-RGO, B-RGO, S-RGO, I-RGO, and RGO0 were fabricated. Subsequently, unbonded flexible electrodes based on carbon cloth were fabricated with the reduced graphene oxides mentioned above, whereupon the structure, morphology and electrochemical performance were characterized. The electrochemical results indicate that the order of specific capacitances is N-RGO > B-RGO > S-RGO > RGO0 > I-RGO, while I-RGO’s potential window is wider than that of the others. As a result, N-RGO displays the best electrochemical performance among all reduced graphene oxides, with a specific capacitance as high as 176.0 F × g-1 and 77.8 % of the initial specific capacitance maintained at a high current density of 20 A × g-1.

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