Exfoliated graphene-supported Pt and Pt-based alloys as electrocatalysts for direct methanol fuel cells

Wen, Quan; Hao, Rui; Zhou, Jian; Eastman, Micah; Manhat, Beth A.; Sun, Qiang; Goforth, Andrea M.; Jiao, Jun

doi:10.1016/j.carbon.2012.10.031

Cited by 117 publications

(55 citation statements)

References 40 publications

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“…It means that synthesized hybrid Pt-Pd on graphene exhibited better performance for methanol electrooxidation at applied potential (from 0.3 to 0.7 V) [71]. Jiao's group [74] synthesized high-quality exfoliated graphene decorated with Pt nanocrystals (3 nm) by simple, low-cost and environmentally benign process of thermal expansion and liquid exfoliation, followed by solvothermal reaction (TELESR process). The hybrid material exhibited larger I f /I b ratio and higher peak current densities than commercial Pt-C catalyst used for MOR.…”

Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

Graphene-supported platinum catalysts for fuel cells

2015

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Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

Graphene-supported platinum catalysts for fuel cells

2015

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“…The outstanding properties of graphene have been a subject in the development of ultrafast electronic and optical devices, energy storage, photo-catalysis, electrochemical sensors and biosensors. [5][6][7][8][9][10] Research has been focused to a large extent on developing routes to obtain large sheets of monolayer or bi-layer graphene. Graphene was initially isolated by mechanical exfoliation, peeling off the top surface of small mesas of pyrolytic graphite, 11,12 which is not appropriate for largescale applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of graphene using gamma radiations

Shahriary

Athawale

2015

Bull Mater Sci

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Considering the advantages of radiolytic synthesis such as the absence of toxic chemical as a reducing agent, uniform distribution of reducing agent and high purity of product, the synthesis of graphene (rGO) from graphene oxide (GO) by the gamma irradiation technique using a relatively low dose rate of 0.24 kGy h −1 has been described. Structural and physicochemical properties of GO and rGO were investigated with the help of various characterization techniques. The presence of peak at 271 nm in ultraviolet-visible spectrum, C= C aromatic stretching vibrations between 1450 and 1600 cm −1 in the Fourier transform infrared spectrum and significant decrease in photoluminescence peak intensity at 470 and 567 nm wavelengths represent the reduction of GO to graphene by gamma irradiation. The decrease in stacking height from 7.71 nm in GO to 3.52 nm in rGO as observed from the X-ray powder diffraction analysis further confirms the same. Raman spectra show significantly lower D to G band ratio for rGO compared with GO. Also, the cyclic voltammograms obtained using GO-and rGO-modified electrodes (working electrode) in standard redox system show enhanced peak intensities together with decrease in potential difference between oxidation and reduction peaks in case of graphene.

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“…The flat monolayer of sp 2 carbon atoms tightly packed in twodimensional honeycomb-like lattice is the building block for graphene. Due to its remarkable mechanical, optical, thermal, electronic, and magnetic [1][2][3][4][5] properties it has been used in various areas of nanosize research such as electronics, batteries, fuel cells, super capacitors, sensors, and biosensors [6][7][8][9][10][11]. Compared to carbon nanotubes, graphene exhibits potential advantages of high surface area, ease of processing, low cost, safety [12], and high purity (absence of transition metals, Fe, Ni, etc.)…”

Section: Introductionmentioning

confidence: 99%

Graphene-Multiwalled Carbon Nanotube Hybrids Synthesized by Gamma Radiations: Application as a Glucose Sensor

Shahriary

Ghourchian

Athawale

2014

Journal of Nanotechnology

117

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Three-dimensional hybrid nanomaterial of graphene-multiwalled carbon nanotubes (G-MWCNTs) was synthesized using gamma rays emitted by a60Co source with a dose rate of 3.95 Gy min−1. The products were characterized by fourier transform infrared (FTIR), ultraviolet-visible (UV-Vis), photoluminescence (PL), and micro-Raman spectroscopy, X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). FTIR and UV-Vis analysis reveals the formation of hybrid nanomaterial which is confirmed by XRD, micro-Raman analysis, and PL. SEM micrograph depicts the composite structure of graphene layers and MWCNTs, while the TEM micrograph exhibits graphene layers covered by MWCNTs. The G-MWCNTs hybrid used as electrode for electrochemical studies in K3Fe(CN)6shows enhancement in electrocatalytic behavior, compared to each individual starting material, therefore, has been applied for amperometric sensing of glucose in alkaline solution and exhibits sensitivity of 12.5 μAmM-1 cm−2and low detection limit 1.45 μM (S/N=3) in a linear range of 0.1 to 14 mM (R2=0.985).

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Exfoliated graphene-supported Pt and Pt-based alloys as electrocatalysts for direct methanol fuel cells

Cited by 117 publications

References 40 publications

Graphene-supported platinum catalysts for fuel cells

Graphene-supported platinum catalysts for fuel cells

Synthesis of graphene using gamma radiations

Graphene-Multiwalled Carbon Nanotube Hybrids Synthesized by Gamma Radiations: Application as a Glucose Sensor

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