Graphene nanoplatelets supported metal nanoparticles for electrochemical oxidation of hydrazine

Wan, Qijin; Liu, Yi; Wang, Zhaohao; Wei, Wei; Li, Beibei; Zou, Jing; Yang, Nianjun

doi:10.1016/j.elecom.2013.01.007

Cited by 56 publications

(33 citation statements)

References 32 publications

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“…The equivalent circuit is composed of R s (the resistance of the electrolyte), in series connection with parallel elements of C dl (double layer capacitance), R ct (resistance to charge transfer and Z w (Warburg impedance). Such circuits have been observed in other studies [16]. The R ct values as determined by the diameter of the semi-circle are listed in Table 2.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 78%

“…Bimetallic nanoparticles have been used for various electrochemical reactions [1][2][3][4][5][6][7][8][9][10][11][12][13][14], including ethanol electro-oxidation [3,12,13], formic acid electro-oxidation [10,11,14], reduction of benzyl chloride [15] and hydrazine detection [16,17]. Bimetallic nanoparticles are based on two different metals and show improved catalytic activity compared to pristine metal nanoparticles, this has been attributed to the synergetic effect of the bimetallic nanoparticles.…”

Section: Introductionmentioning

confidence: 97%

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Electrocatalytic activity of bimetallic Au–Pd nanoparticles in the presence of cobalt tetraaminophthalocyanine

Maringa

Mashazi

Nyokong

2015

Journal of Colloid and Interface Science

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Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 78%

Section: Introductionmentioning

confidence: 97%

Electrocatalytic activity of bimetallic Au–Pd nanoparticles in the presence of cobalt tetraaminophthalocyanine

Maringa

Mashazi

Nyokong

2015

Journal of Colloid and Interface Science

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“…[17][18][19] A similar behavior was also reported for multicomponent systems formed of graphene sheets decorated with bimetallic nanoparticles. 20 In their recent work, Hu et al 21 demonstrated that graphenebimetallic Pt-Au nanoparticles exhibited an enhanced electro-catalytic activity, compared with Au-graphene or Pt-graphene. By using cyclic voltammetry, they showed that the Pt-Au-graphene catalyst was better than Au-graphene or Pt-graphene, for both the oxygen reduction reaction and the methanol oxidation reaction.…”

Section: S-captopril 1-(3-mercapto-2-(s)-methyl-1-oxopropyl)-s(l)mentioning

confidence: 99%

Direct electrochemical oxidation of S-captopril using gold electrodes modified with graphene-AuAg nanocomposites

Pogăcean

Biriş

Coroș

et al. 2014

IJN

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In this paper, we present a novel approach for the electrochemical detection of S -captopril based on graphene AuAg nanostructures used to modify an Au electrode. Multi-layer graphene (Gr) sheets decorated with embedded bimetallic AuAg nanoparticles were successfully synthesized catalytically with methane as the carbon source. The two catalytic systems contained 1.0 wt% Ag and 1.0 wt% Au, while the second had a larger concentration of metals (1.5 wt% Ag and 1.5 wt% Au) and was used for the synthesis of the Gr-AuAg-1 and Gr-AuAg-1.5 multicomponent samples. High-resolution transmission electron microscopy analysis indicated the presence of graphene flakes that had regular shapes (square or rectangular) and dimensions in the tens to hundreds of nanometers. We found that the size of the embedded AuAg nanoparticles varied between 5 and 100 nm, with the majority being smaller than 20 nm. Advanced scanning transmission electron microscopy studies indicated a bimetallic characteristic of the metallic clusters. The resulting Gr-AuAg-1 and Gr-AuAg-1.5 samples were used to modify the surface of commonly used Au substrates and subsequently employed for the direct electrochemical oxidation of S -captopril. By comparing the differential pulse voltammograms recorded with the two modified electrodes at various concentrations of captopril, the peak current was determined to be well-defined, even at relatively low concentration (10 −5 M), for the Au/Gr-AuAg-1.5 electrode. In contrast, the signals recorded with the Au/Gr-AuAg-1 electrode were poorly defined within a 5×10 −6 to 5×10 −3 M concentration range, and many of them overlapped with the background. Such composite materials could find significant applications in nanotechnology, sensing, or nanomedicine.

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“…Metal nanoparticles have attracted a great interest in scientific research due to their unique properties such as the catalytic activities, optical, electronic, magnetic properties and large surface-to-volume ratio that cannot be observed by their bulk complement (Wan et al 2013;Li et al 2011;Sarkar et al 2012). Various techniques have been developed to synthesis the metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Determination of Bromate in Different Types of Flour and Bread by a Sensitive Amperometric Sensor Based on Palladium Nanoparticles/Graphene Oxide Nanosheets

et al. 2015

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In the present work, a novel amperometric sensor for bromate detection and determination based on palladium nanoparticles supported by graphene oxide nanosheets (PdNPs-GO) modified glassy carbon (GC) electrode was fabricated. The graphene nanosheets were functionalized using a novel method, and palladium nanoparticles were synthesized by electrodeposition method. The surface morphology of modified electrodes was investigated using scanning electron microscopy (SEM). Determination and investigation of electrochemical parameters of bromate reduction were performed using rotating disk electrode (RDE) amperometry and cyclic voltammetry (CV) methods, respectively. The experimental data showed that PdNPs-GO/GC electrode has significant electrocatalytic activity toward bromate reduction. A wide concentration range (1-10 μM and 10-1,000 μM) with a good detection limit (1.05×10 −7 M) were achieved. Also, this sensor has a short response time (15 s) and its sensitivity is 7.428 A/Mcm 2 . The accuracy of the proposed method was investigated by recovery experiments in different flour and bread samples where good recoveries were obtained (between 94 and 110 %). Furthermore, this electrode exhibited remarkable stability, repeatability, and selectivity.

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Graphene nanoplatelets supported metal nanoparticles for electrochemical oxidation of hydrazine

Cited by 56 publications

References 32 publications

Electrocatalytic activity of bimetallic Au–Pd nanoparticles in the presence of cobalt tetraaminophthalocyanine

Electrocatalytic activity of bimetallic Au–Pd nanoparticles in the presence of cobalt tetraaminophthalocyanine

Direct electrochemical oxidation of S-captopril using gold electrodes modified with graphene-AuAg nanocomposites

Electrochemical Determination of Bromate in Different Types of Flour and Bread by a Sensitive Amperometric Sensor Based on Palladium Nanoparticles/Graphene Oxide Nanosheets

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