Thiolated graphene oxide-supported palladium cobalt alloyed nanoparticles as high performance electrocatalyst for oxygen reduction reaction

Yun, Mira; Ahmed, Mohammad Shamsuddin

doi:10.1016/j.jpowsour.2015.05.094

Cited by 69 publications

(33 citation statements)

References 58 publications

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“…The major intensity of C=C or C-C indicated the successful oxygen removal from oxygen-containing functional groups from GO upon chemical reduction. However, the increased intensity of C-O peak in rGO-PxDA-Pd and rGO-MxDA-Pd were observed compared to rGO-PxDA, rGO-MxDA, probably due to the influence of C-N bond [14,38]. The core levels of N1s, O1s…”

Section: Instrumental Characterizationmentioning

confidence: 91%

Highly efficient benzylamine functionalized graphene supported palladium for electrocatalytic hydrazine determination

Ejaz

Ahmed

2015

Sensors and Actuators B: Chemical

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Section: Instrumental Characterizationmentioning

confidence: 91%

Highly efficient benzylamine functionalized graphene supported palladium for electrocatalytic hydrazine determination

Ejaz

Ahmed

2015

Sensors and Actuators B: Chemical

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“…However, the amount of H 2 O 2 generated on the AgNCs/rGO_AA electrode is significantly lower than that on the AgNCs/rGO_NaBH 4 electrodes and similar to the Pt/C, indicating that AgNCs/rGO_AA is an efficient ORR electrocatalyst. The n values and H 2 O 2 formation yields were further calculated from the given Equations 6 and 7 6,17,65,52 based on the RRDE data. As shown in Figure 6b, the n value increases with a decreasing of the negative potential.…”

Section: 55mentioning

confidence: 99%

Graphene Supported Silver Nanocrystals Preparation for Efficient Oxygen Reduction in Alkaline Fuel Cells

Ahmed

Lee

Kim

2016

J. Electrochem. Soc.

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The silver nanocrystals (AgNCs) anchored on graphene oxide (GO) catalysts have been synthesized by a facile chemical reduction and nontemplate method using ascorbic acid (AA) as reducing agent and have successfully employed as a cathode catalyst for oxygen reduction reaction (ORR) in direct alkaline fuel cells (DAFCs). The morphological characterizations demonstrate that the AgNCs have crystalline form and grafted onto reduced graphene oxide (AgNCs/rGO_AA). Comparatively better dispersion and higher population of AgNCs have observed on AA treated AgNCs/rGO than NaBH 4 which is known as conventional reducing agent. The electrochemical catalysis in 0.1 M KOH electrolyte has demonstrated that the AgNCs/rGO_AA has an excellent electrocatalytic activity for ORR in alkaline media compared to the other tested electrodes. Particularly, it shows 40% higher mass activity with large specific activity against 20 wt% Pt/C with faster electron transfer rate per O 2 . Moreover, the reaction kinetic parameters have confirmed that the ORR at AgNCs/rGO_AA catalyst not only follows a 4e -process with lowering H 2 O 2 formation but also proceeds on with good stability and fuel selectivity in DAFCs. The oxygen reduction reaction (ORR) is an interesting research area and already attracted widespread attention of researches from all over the world because of its important role in the application of energy storage and conversion devices, such as fuel cells (FCs) and metal−air batteries in alkaline media.1-4 Due to superior energy conversion efficiency and potential for providing clean energy, FCs are in the main attention as next generation energy sources. 5,6 As the FCs consists of anode and cathode electrodes, the greatest effect on the performance of FCs is the oxidation/reduction reaction kinetics occurring at the respective electrodes. Unfortunately, the sluggish kinetic rate of ORR at the cathode is the main obligation to be applied in industry. 6 Typically, the platinum (Pt) and/or Pt-based materials are known as the most efficient electrocatalyst in the cathode for ORR catalysis [7][8][9][10] but unfortunately, the Pt-based materials have faced many troubles such as its susceptibility to time dependent drift and CO poisoning, 11,12 slow electron-transfer kinetics, 13 high costs, limited supply, 14 and poor durability. 15 For those reasons, Pt has hindered the widespread commercialization of FCs technology. To overcome the cost challenges, significant efforts have focused on the development of alternative non-Pt catalysts that are based on mainly non-precious metals and/or various heteroatom-doped carbonaceous materials. [16][17][18] Among the non-Pt metal catalysts studied, silver (Ag)-based carbon nanomaterials have been explored as promising candidates with higher activity and stability in alkaline medium recently. [19][20][21][22] According to previous reports, the Ag is an ideal alternative of Pt because it is not only abundantly available in nature and much cheaper but also higher electrical and thermal conductive than Pt....

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“…Graphene has already been used in various fields, especially in catalysis, and sensors. [16][17][18][19][20][21][22][23] The graphene sheets can be readily synthesized by reducing oxygen functional groups such as hydroxyl, epoxide, and carboxyl groups (on planes and edges) present on the surface of graphene oxide (GO). 24 Doping is one of the simple and efficient way to increase the catalytic activity of graphene catalysts because they not only exhibit excellent electrocatalytic activity but also possess other advantages including low cost, better stability, and environment-friendly.…”

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confidence: 99%

Determination of Dopamine by Dual Doped Graphene-Fe₂O₃in Presence of Ascorbic Acid

Yasmin

Ahmed

Jeon

2015

J. Electrochem. Soc.

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Both nitrogen and sulfur dual doped graphene supported Fe 2 O 3 (NSG-Fe 2 O 3 ) have been prepared by hydrothermal methods and subsequently utilized for the electrochemical determination of dopamine (DA) in presence of ascorbic acid (AA). The NSG-Fe 2 O 3 has been characterized via transmission electron microscopy (TEM) and X-ray photoelectron spectroscopic (XPS). The electrochemical detection of DA was measured through the cyclic voltammetry, differential pulse voltammetry, and amperometric techniques in a 0.1 M phosphate buffer solution (PBS) at pH 7.4. Interferences have been investigated in presence of AA, glucose, serotonin, N 2 H 4 , and uric acid. The NSG-Fe 2 O 3 has shown good analytical performance for DA with comparatively better sensitivity (29.1 μA mM −1 ), long linear detection range (0.3-210 μM) and detection limit (0.035 μM) (S/N = 3). The catalytic rate constant for DA detection has been calculated as 9.6 × 10 4 M −1 s −1 with a good diffusion coefficient of 3.5 × 10 −4 cm 2 s −1 . The electrooxidation of DA may enhances by fast proton acceptance and/or electron donation due to higher electron density for excess loan pair electron that provided from N and S dual-doped graphene sheets. 3,4-dihydroxyphenyl ethylamine (dopamine, DA) plays a significant role as a neurotransmitter in the function of the central nervous, renal and hormonal system. Low levels or abnormalities in DA concentration may lead to several neurological diseases, such as schizophrenia, Parkinson's disease, attention deficit hyperactivity disorder, restless legs syndrome and drug addiction.1-4 It is, however, several analytical techniques have been developed for DA detection, including high performance liquid chromatography, 5 chemiluminescence 6 and gas chromatography-mass spectrometry, 7 but each technique has several disadvantages. On the other hand, electrochemical sensing is preferred alternative method because of simple operation, fast response, time savings, low-cost, high-sensitivity and excellent selectivity. [8][9][10][11] Nevertheless, the electrochemical determination of DA is generally hindered by high concentration ascorbic acid (AA) which is another electroactive species that plays an important role in human metabolism and interfering species for DA sensing. Through the electrochemical method, it is difficult to sense DA selectively in the presence of high concentration AA, because these two species are responding nearly the same oxidation potential on the bare electrode, resulting in poor selectivity and sensitivity of DA detection. 12Graphene sheets are highly conductive and have 2D flat lattices consisting of a monolayer of sp 2 -hybridized carbon atoms. Due to high electrical conductivity and electron mobility, large surface area, long-term stability and unique mechanical flexibility, 13-15 graphene has attracted a great deal of research interest. Graphene has already been used in various fields, especially in catalysis, and sensors. [16][17][18][19][20][21][22][23] The graphene sheets can be readily synthesiz...

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Thiolated graphene oxide-supported palladium cobalt alloyed nanoparticles as high performance electrocatalyst for oxygen reduction reaction

Cited by 69 publications

References 58 publications

Highly efficient benzylamine functionalized graphene supported palladium for electrocatalytic hydrazine determination

Highly efficient benzylamine functionalized graphene supported palladium for electrocatalytic hydrazine determination

Graphene Supported Silver Nanocrystals Preparation for Efficient Oxygen Reduction in Alkaline Fuel Cells

Determination of Dopamine by Dual Doped Graphene-Fe₂O₃in Presence of Ascorbic Acid

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Thiolated graphene oxide-supported palladium cobalt alloyed nanoparticles as high performance electrocatalyst for oxygen reduction reaction

Cited by 69 publications

References 58 publications

Highly efficient benzylamine functionalized graphene supported palladium for electrocatalytic hydrazine determination

Highly efficient benzylamine functionalized graphene supported palladium for electrocatalytic hydrazine determination

Graphene Supported Silver Nanocrystals Preparation for Efficient Oxygen Reduction in Alkaline Fuel Cells

Determination of Dopamine by Dual Doped Graphene-Fe2O3in Presence of Ascorbic Acid

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Determination of Dopamine by Dual Doped Graphene-Fe₂O₃in Presence of Ascorbic Acid