Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN): role of surfactant upon the electrochemical reduction of oxygen and capacitance applications

Khan, Aamar F.; Down, Michael P.; Smith, Graham C.; Foster, Christopher W.; Banks, Craig E.

doi:10.1039/c6ta09999h

Cited by 50 publications

(33 citation statements)

References 44 publications

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“…Graphene was modelled by using 6 × 6 × 1 repeat graphene sheet. We consider Pt 6 and Pt 9 nanoclusters for the simulation as used in many electrochemical and catalytic studies based on Pt systems [43][44][45][46][47][48][49][50][51]. Pt 6 and Pt 9 nanoclusters were modelled from slicing the Pt (111) layer with 27 atoms arranged in [3 × 3] layered structure.…”

Section: Computational Detailsmentioning

confidence: 99%

Experimental and Theoretical Study on SO₂ Tolerance of Pt Electrocatalysts: Role of Carbon Support

et al. 2020

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Durability of fuel cell is still a major concern for successful progress and commercialization of proton exchange membrane fuel cell (PEMFC) technology. One of the factors affecting durability of PEMFC is the impurities present in atmospheric air that is fed at cathode which degrades the PEMFC performance. Conventionally used electrocatalyst, platinum (Pt) supported on carbon (C), is susceptible even to trace amounts of SO2 present in atmospheric air. The present study investigates the effect of SO2 and role of carbon support in platinum electrocatalysts at different weight ratios of carbon and platinum (20 wt% and 40 wt% Pt/C). Tolerance towards SO2 contaminations has been evaluated through electrochemical studies. The sulfur coverage percentage was found to be 57 % and 43 % for 20 wt% and 40 wt% Pt/C, respectively. However, the unsupported Pt black showed better tolerance with 31 % of sulfur coverage implying the susceptibility of carbon towards SO2 contamination. Density functional theory (DFT) studies proved the synergistic effect of SO2 adsorption and its dissolution mechanism on carbon supported Pt electrocatalysts.

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Section: Computational Detailsmentioning

confidence: 99%

Experimental and Theoretical Study on SO₂ Tolerance of Pt Electrocatalysts: Role of Carbon Support

et al. 2020

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“…We have previously utilised TEM, SEM, XRD, XPS, EDX UVvisible spectroscopy and Raman spectroscopy to comprehensively characterise the surfactant exfoliated 2D-hBN. 27 Interested readers are referred to the ESI † for further information. A TEM image is depicted in Fig.…”

Section: Physicochemical Characterisationmentioning

confidence: 99%

Surfactant exfoliated 2D hexagonal Boron Nitride (2D-hBN) explored as a potential electrochemical sensor for dopamine: surfactants significantly influence sensor capabilities

Khan

Brownson

Foster

et al. 2017

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Surfactant exfoliated 2D hexagonal Boron Nitride (2D-hBN) nanosheets are explored as a potential electrochemical sensing platform and evaluated towards the electroanalytical sensing of dopamine (DA) in the presence of the common interferents, ascorbic acid (AA) and uric acid (UA). Surfactant exfoliated 2D-hBN nanosheets (2-4 layers) fabricated using sodium cholate in aqueous media are electrically wired via a drop-casting modification process onto disposable screen-printed graphite electrodes (SPEs). We critically evaluate the performance of these 2D-hBN modified SPEs and demonstrate the effect of 'mass coverage' towards the detection of DA, AA and UA. Previous studies utilising surfactant-free (pristine) 2D-hBN modified SPEs have shown a beneficial effect towards the detection of DA, AA and UA when compared to the underlying/unmodified graphite-based electrode. We show that the fabrication route utilised to prepare 2D-hBN is a vital experimental consideration, such that the beneficial effect previously reported is considerably reduced when surfactant exfoliated 2D-hBN is utilised. We demonstrate for the first time, through implementation of control experiments in the form of surfactant modified graphite electrodes, that sodium cholate is a major contributing factor to the aforementioned detrimental behaviour. The significance here is not in the material per se, but the fundamental knowledge of the surfactant and surface coverage changing the electrochemical properties of the material under investigation. Given the wide variety of ionic and non-ionic surfactants that are utilised in the manufacture of novel 2D materials, the control experiments reported herein need to be performed in order to de-convolute the electrochemical response and effectively evaluate the 'underlying surface/surfactant/2D materials' electrocatalytic contribution.

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“…Being an electric insulator also paves a way for further optoelectronic applications such as ultraviolet light-emitters [10,17]. Recent efforts on bandgap tunability of h-BN through doping or chemical functionalization has also revealed their potential for a wide range of electrochemical applications, from energy storage to biosensors [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in the Study of Thermal Properties and Tribological Behaviors of Hexagonal Boron Nitride-Reinforced Composites

et al. 2020

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Ever-increasing significance of composite materials with high thermal conductivity, low thermal expansion coefficient and high optical bandgap over the last decade, have proved their indispensable roles in a wide range of applications. Hexagonal boron nitride (h-BN), a layered material having a high thermal conductivity along the planes and the band gap of 5.9 eV, has always been a promising candidate to provide superior heat transfer with minimal phonon scattering through the system. Hence, extensive researches have been devoted to improving the thermal conductivity of different matrices by using h-BN fillers. Apart from that, lubrication property of h-BN has also been extensively researched, demonstrating the effectivity of this layered structure in reduction of friction coefficient, increasing wear resistance and cost-effectivity of the process. Herein, an in-depth discussion of thermal and tribological properties of the reinforced composite by h-BN will be provided, focusing on the recent progress and future trends.

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Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN): role of surfactant upon the electrochemical reduction of oxygen and capacitance applications

Abstract: Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN) nanosheets are fabricated using the surfactant sodium cholate in aqueous media and are explored towards the electrochemical reduction of oxygen.

Cited by 50 publications

References 44 publications

Experimental and Theoretical Study on SO₂ Tolerance of Pt Electrocatalysts: Role of Carbon Support

Experimental and Theoretical Study on SO₂ Tolerance of Pt Electrocatalysts: Role of Carbon Support

Surfactant exfoliated 2D hexagonal Boron Nitride (2D-hBN) explored as a potential electrochemical sensor for dopamine: surfactants significantly influence sensor capabilities

Recent Progress in the Study of Thermal Properties and Tribological Behaviors of Hexagonal Boron Nitride-Reinforced Composites

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Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN): role of surfactant upon the electrochemical reduction of oxygen and capacitance applications

Abstract: Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN) nanosheets are fabricated using the surfactant sodium cholate in aqueous media and are explored towards the electrochemical reduction of oxygen.

Cited by 50 publications

References 44 publications

Experimental and Theoretical Study on SO2 Tolerance of Pt Electrocatalysts: Role of Carbon Support

Experimental and Theoretical Study on SO2 Tolerance of Pt Electrocatalysts: Role of Carbon Support

Surfactant exfoliated 2D hexagonal Boron Nitride (2D-hBN) explored as a potential electrochemical sensor for dopamine: surfactants significantly influence sensor capabilities

Recent Progress in the Study of Thermal Properties and Tribological Behaviors of Hexagonal Boron Nitride-Reinforced Composites

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Experimental and Theoretical Study on SO₂ Tolerance of Pt Electrocatalysts: Role of Carbon Support

Experimental and Theoretical Study on SO₂ Tolerance of Pt Electrocatalysts: Role of Carbon Support