Attachment of Platinum Nanoparticles to Substrates by Coating and Polyol Reduction of A Platinum Precursor

Cho, Swee Jen; Ouyang, Jianyong

doi:10.1021/jp2001699

Cited by 46 publications

(49 citation statements)

References 51 publications

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“…Also, modifying the Pt:Au ratio would result in different tolerance performances, which the Pt:Au ratio of 1:2 yields the highest If/Ib ratio and best catalytic performance. (Cho, Mei, & Ouyang, 2012), while Pt nanostructures are 3D (Cho & Ouyang, 2011;Shen et al, 2008) when grown on substrates. By referring to their lowest surface energy crystallographic plane (111), given that Pt and Au have face-centered cubic structures, the specific surface energies of Pt and Au are 2.299 J m -2 and 1.283 J m -2 respectively (Vitos, Ruban, Skriver, & Kollar, 1998).…”

Section: Journal Of Young Investigatorsmentioning

confidence: 99%

“…Platinum (Pt) nanoparticles act as catalysts in proton exchange membrane (PEM) fuel cells powering machinery (Bing, Liu, Zhang, Ghosh, & Zhang, 2010;Ouyang & Cho, 2011). Using H2 or liquid fuels like CH3OH, PEM fuel cells, made up of acid-soaked PEM placed in between the anode and cathode catalyst, oxidize the fuel at the cathode and reduce the oxygen entering the cell.…”

Section: Introductionmentioning

confidence: 99%

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Chemical Reduction and Deposition of Nanostructured Pt–Au Alloy

Seow¹

2016

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Section: Journal Of Young Investigatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical Reduction and Deposition of Nanostructured Pt–Au Alloy

Seow¹

2016

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“…Rather than adding a capping agent to protect the reduced Pt NPs from further aggregation, we added various proportions of NaOH to the polyol solutions to control the rate of reduction to form Pt NPs under various pH conditions. 23,28,29 The SH-modified TCO substrate was then immersed in the Pt NP solution prepared at 295 K for 12 h to complete the formation of SAM-Pt on a clean surface of TCO. The bottom right panel of Scheme 1 shows an energy dispersive X-ray spectrometer mapping image of a SAM-Pt on a fluorine-doped tin oxide (FTO) glass substrate (also shown in Supplementary Figure S1), demonstrating the uniform morphology of the SAM-Pt NP synthesized under conditions free of stabilizer and with a controlled pH.…”

Section: Preparation Of Monodispersed Pt Np Solutions Controlled By Phmentioning

confidence: 99%

“…Under such a thermal treatment, the shapes and the sizes of the nanostructures are difficult to control because of their deformation or aggregation at high temperatures. Although Cho et al 23,24 reported a polyol reduction to prepare Pt CEs for DSSCs at temperatures of 160-180 1C, it is difficult to prepare the thin layer of Pt nanostructures with a uniform morphology and size distribution on TCO at temperatures near 295 K, in particular, to obtain the advantages of excellent electrocatalytic function, large active surface area and effective adhesion to the substrate. As highlighted in Figure 1, in the present work, we demonstrate a feasible strategy for preparing self-assembled Pt monolayers (SAM-Pt) on the surface of TCO in two steps without adding a surfactant or protective agent; thus, the postheating step is avoided.…”

Section: Introductionmentioning

confidence: 99%

Nanofabrication of uniform and stabilizer-free self-assembled platinum monolayers as counter electrodes for dye-sensitized solar cells

Tsai

et al. 2014

NPG Asia Mater

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We report a two-step dip-coating approach for the fabrication of self-assembled monolayers of platinum nanocrystals (SAM-Pt) with a particle size of B3 nm and that are uniformly deposited on a transparent conducting oxide (TCO) surface to serve as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). In the first step, we prepared a polyol solution containing H 2 PtCl 6 and ethylene glycol at 110 1C, in which the reduction kinetics were controlled by adding various proportions of NaOH. In the second step, we immersed a thiol-modified TCO substrate into the polyol solution with monodispersed Pt nanoparticles prepared at pH 3.7 at approximately 295 K to complete the nanofabrication. The DSSC devices using Z907 dye as a photosensitizer and the CE prepared using this SAM-Pt approach attained notable photovoltaic performance (Z ¼ 9.2%) comparable with those fabricated using a conventional thermal decomposition method (Z ¼ 9.1%) or a cyclic electrodeposition method (Z ¼ 9.3%) under the same experimental conditions. We emphasize that the SAM-Pt films feature a clean surface, uniform morphology, narrow size distribution, small Pt loading and great catalytic activity; the present approach is hence not only suitable for DSSCs but also applicable for many other energy-related applications that require platinum as an efficient catalyst.

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“…This high temperature corresponds to the thermal decomposition temperature of H 2 PtCl 6 in the absence of a reducing agent [30]. In systems where EG is used as a reducing agent, the thermal reduction temperature of H 2 PtCl 6 can be as low as 160°C [32]. The reaction is proposed to proceed via a double-oxidation of EG [31,36].…”

Section: Ink Developmentmentioning

confidence: 99%

Nanoscale platinum printing on insulating substrates

O’Connell¹,

Higgins²,

Sullivan³

et al. 2013

Nanotechnology

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The deposition of noble metals on soft and/or flexible substrates is vital for several emerging applications including flexible electronics and the fabrication of soft bionic implants. In this paper, we describe a new strategy for the deposition of platinum electrodes on a range of materials, including insulators and flexible polymers. The strategy is enabled by two principle advances: (1) the introduction of a novel, low temperature strategy for reducing chloroplatinic acid to platinum using nitrogen plasma; (2) the development of a chloroplatinic acid based liquid ink formulation, utilizing ethylene glycol as both ink carrier and reducing agent, for versatile printing at nanoscale resolution using dip-pen nanolithography (DPN). The ink formulation has been printed and reduced upon Si, glass, ITO, Ge, PDMS, and Parylene C. The plasma treatment effects reduction of the precursor patterns in situ without subjecting the substrate to destructively high temperatures. Feature size is controlled via dwell time and degree of ink loading, and platinum features with 60 nm dimensions could be routinely achieved on Si. Reduction of the ink to platinum was confirmed by energy dispersive x-ray spectroscopy (EDS) elemental analysis and x-ray diffraction (XRD) measurements. Feature morphology was characterized by optical microscopy, SEM and AFM. The high electrochemical activity of individually printed Pt features was characterized using scanning electrochemical microscopy (SECM). Abstract. The deposition of noble metals on soft and/or flexible substrates is vital for several emerging applications including flexible electronics and the fabrication of soft bionic implants. In this article, we describe a new strategy for the deposition of platinum electrodes on a range of materials, including insulators and flexible polymers. The strategy is enabled by two principle advances: 1) the introduction of a novel, low-temperature strategy for reducing chloroplatinic acid to platinum using nitrogen plasma; 2) the development of a chloroplatinic acid based liquid ink formulation, utilising ethylene glycol as both ink carrier and reducing agent, for versatile printing at nanoscale resolution using dip-pen nanolithography (DPN). The ink formulation has been printed and reduced upon Si, glass, ITO, Ge, PDMS, and Parylene C. The plasma treatment effects reduction of the precursor patterns in situ without subjecting the substrate to destructively high temperatures. Feature size is controlled via dwell time and degree of ink loading, and platinum features with 60 nm dimensions could be routinely achieved on Si. Reduction of the ink to platinum was confirmed by Energy dispersive X-ray spectroscopy (EDS) elemental analysis and X-Ray Diffraction (XRD) measurements. Feature morphology was characterized by optical microscopy, SEM and AFM. The high electrochemical activity of individually printed Pt features was characterized using Scanning Electrochemical Microscopy (SECM).

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Attachment of Platinum Nanoparticles to Substrates by Coating and Polyol Reduction of A Platinum Precursor

Cited by 46 publications

References 51 publications

Chemical Reduction and Deposition of Nanostructured Pt–Au Alloy

Chemical Reduction and Deposition of Nanostructured Pt–Au Alloy

Nanofabrication of uniform and stabilizer-free self-assembled platinum monolayers as counter electrodes for dye-sensitized solar cells

Nanoscale platinum printing on insulating substrates

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