Defective Graphene Foam: A Platinum Catalyst Support for PEMFCs

Liu, Jianfeng; Daio, Takeshi; Sasaki, Kazunari; Lyth, Stephen M.

doi:10.1149/2.0231409jes

Cited by 42 publications

(35 citation statements)

References 24 publications

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“…Gram-scale synthesis of defective GF decorated with PtNPs and Pt-decorated 3D graphene structures has been reported [85]. Defective GF as a support for PtNPs provides a large surface area and small pore sizes.…”

Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

“…Defective GF as a support for PtNPs provides a large surface area and small pore sizes. Loading of PtNPs can be increased from 20 wt% (for GF, carbon black, commercially available graphene) up to 33 wt% on defective GF [85]. Relative durability was tested by recording the retention of ECSA over 60,000 cycles via accelerated start/stop tests.…”

Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

“…Relative durability was tested by recording the retention of ECSA over 60,000 cycles via accelerated start/stop tests. GF-Pt lost all of the activity after only 30,000 cycles, due to facile oxidation of GF support [85]. In membrane assemblies, GF showed better performance than carbon black in the activation region, but significantly worse performance in the mass diffusion region [85].…”

Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

“…GF-Pt lost all of the activity after only 30,000 cycles, due to facile oxidation of GF support [85]. In membrane assemblies, GF showed better performance than carbon black in the activation region, but significantly worse performance in the mass diffusion region [85]. Huang et al [86] recently presented promising data for methanol oxidation catalysis using Pt on functionalized graphene 3D structures.…”

Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

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Graphene-supported platinum catalysts for fuel cells

2015

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Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

Section: Graphene-pt Hybrid Materialsmentioning

confidence: 99%

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Graphene-supported platinum catalysts for fuel cells

2015

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“…Significant studies carried out in this journal have focused on the use of graphene as double layer capacitors, 34,35 as a hydrogen storage medium, 36 and as an electrocatalyst support. 37,38 Modification or functionalization of the graphene surface could potentially impart unique and interesting properties, including electrocatalytic or photocatalytic properties. 39,40 For example, graphene by itself is not a photoactive material.…”

mentioning

confidence: 99%

Electrochemical UV Sensor Using Carbon Quantum Dot/Graphene Semiconductor

Wang

Myers

2017

J. Electrochem. Soc.

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Our group has developed an electrochemical UV sensor utilizing carbon quantum dots as the photoactive material functionalizing a graphene semiconductor layer. When used as a photoactive electrode in contact with a solid polymer electrolyte in a photoelectrochemical cell, illumination under UV radiation at 365 nm induces a photocurrent with a corresponding change in device voltage. The time-dependent change in voltage is a function of UV radiation intensity. Varying the UV LED power density from 26.6 mW/cm 2 (approximately 100% intensity) to 5.1 mW/cm 2 (approximately 20% intensity) results in time-dependent potential changes (dU/dt) ranging from approximately 4.0 mV/s to 0.5 mV/s. The dU/dt vs. LED power density trend is nearly linear (r 2 = 0.97). Similarly, when a constant bias potential is applied to the cell, a sustained photocurrent is observed under UV illumination, with the magnitude of the photocurrent a linear function of the LED power density. In that case, the coefficient of determination r 2 = 0.98. These results indicate that a graphene semiconductor, when functionalized with a photoactive material like carbon quantum dots, has application as a UV sensor with the ability to quantify the intensity of UV radiation. Nano-scale carbon-based materials, such as carbon quantum dots (CQDs), have received significant attention recently due to their unique optical and electronic properties.1 Depending on the particular synthesis procedure and the carbon source, carbon quantum dots can be environmentally and biologically benign.2 It is interesting to note that practically any carbon-containing material can be used as the source for carbon quantum dots. Literature reports on a host of starting materials exist. For example, Meiling and co-workers have used starch and tris-acetate-EDTA buffer as carbon sources.3 Du and co-workers prepared carbon quantum dots from orange pericarp in a hydrothermal treatment method. 4 Zhou, et al., used watermelon peel as a carbon source.5 Often, carbon quantum dots are simply obtained from more typical laboratory chemicals like citric acid. [6][7][8] There are also many possible CQD synthesis techniques, including hydrothermal methods, 9,10 electrochemical methods 11 and microwave-assisted methods.12,13 The combination of widely-variable carbon sources and facile synthesis procedures has ensured that CQD research continues to grow. It is likely that organic CQDs will make up a large share of the growing nanomaterial market. In fact, CQDs have been suggested as markers for biosensing and bioimaging, It is generally accepted that size and surface properties determine CQD optical and electronic behavior. Modification of the surface properties could be achieved by doping the CQDs, often with nitrogen. 24,25 For example, it has been demonstrated that N-doping of CQDs increases quantum yield and electron transfer.26 These N-doped CQDs (henceforth referred to as N-CQDs in this paper) possess unique properties like electrocatalytic activity, controllable luminescence and are also biologic...

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Electrocatalysts in Polymer Electrolyte Membrane Fuel Cells

Lyth

Mufundirwa

2021

Heterogeneous Catalysts

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Defective Graphene Foam: A Platinum Catalyst Support for PEMFCs

Cited by 42 publications

References 24 publications

Graphene-supported platinum catalysts for fuel cells

Graphene-supported platinum catalysts for fuel cells

Electrochemical UV Sensor Using Carbon Quantum Dot/Graphene Semiconductor

Electrocatalysts in Polymer Electrolyte Membrane Fuel Cells

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