Electrocatalysis of the hydrogen evolution reaction by nanocomposites of poly(amidoamine)-encapsulated platinum nanoparticles and phosphotungstic acid

Sun, Laisheng; Ca, Diep Vu; Cox, James A.

doi:10.1007/s10008-005-0008-8

Cited by 48 publications

(28 citation statements)

References 36 publications

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“…POMs have been studied as monolayers or organic-inorganic hybrids in contact with different supporting electrolytes [34,35], and as single crystals in the absence of external liquid phase [21][22][23][24][25][26]. The electrochemical analysis of the most popular Keggin-type POMs (phosphotungstate and tungstosilicate) in the presence of acidic solution revealed three reversible reduction peaks originating from two one-electron processes followed by one two-electron process [17,21,22,36].…”

Section: Introductionmentioning

confidence: 99%

Solid-state electrochemical behavior of Keggin-type borotungstic acid single crystal

Adamczyk

Miecznikowski

2013

J Solid State Electrochem

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We demonstrate the electrochemical characteristics of the, poorly described in the literature, mixed-valence proton conducting solid borotungstic acid single crystal, H 5 BW 12 O 40 xH 2 O, in the absence of liquid electrolyte phase. We performed electrochemical measurements in an all-solid cell with a gold fiber ultramicrodisk (diameter 10, 25, and 40 μm) working electrode, a silver semi-reference disk electrode, and a glassy carbon ring counter electrode. Diagnostic experiments at different scan rates aimed at probing the model of mass transport and potential kinetic limitations. Such bulk parameters as the effective diffusion coefficient of charge propagation and the concentration of mixed-valence redox centers were determined by two methods. The first method is based on the analysis of both Cottrellian and steady-state currents (the mixed-regimes method), and the second method provides the true diffusion coefficient (transport coefficient free of the migration influence) for both the substrate and the product of the electrode reaction. Together, these methods constitute a double potential step chronoamperometry experiment. The data obtained with these electrochemical experiments (effective diffusion coefficients, concentration of mixed-valence redox centers, etc.) can support the results obtained with other techniques (XRD, FTIR, and TGA).

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Section: Introductionmentioning

confidence: 99%

Solid-state electrochemical behavior of Keggin-type borotungstic acid single crystal

Adamczyk

Miecznikowski

2013

J Solid State Electrochem

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“…Synthesis of platinum (Pt) nanostructures with controlled size and shape is one of the most important goals in developing highly active Pt catalysts for many industrial applications, including fine chemical synthesis, [1][2][3][4] gas sensing, [5] hydrogen production, [6] and the reduction of pollutant gases emitted from automobiles. [7] Pt is also the key catalyst in polymer electrolyte membrane (PEM) fuel cells: [8][9][10] it catalyzes hydrogen or alcohol oxidation at the anode and oxygen reduction at the cathode.…”

mentioning

confidence: 99%

Controlled Growth of Pt Nanowires on Carbon Nanospheres and Their Enhanced Performance as Electrocatalysts in PEM Fuel Cells

Sun¹,

Jaouen²,

Dodelet³

2008

Advanced Materials

318

267

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“…25 POMs are suitable for the LbL technique because of their solubility in aqueous solutions and high anionic charge. LbL lms from POMs have been produced with alternating layers of cationic metal complexes, [26][27][28] metal nanoparticles [29][30][31][32] and polymers such as poly(allylamine hydrochloride), poly(ethyleneimine), chitosan and poly(amidoamine).…”

mentioning

confidence: 99%

Poly(dimethylsiloxane) as a pre-coating in layer-by-layer films containing phosphotungstate nanoclusters electrochemically sensitive toward s-triazines

et al. 2014

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2014Poly(dimethylsiloxane) as a pre-coating in layer-by-layer films containing phosphotungstate nanoclusters electrochemically sensitive toward s-triazines RSC Advances,Cambridge : Royal Society of Chemistry -RSC,v. 4, n. 56, p. 29612-29621, 2014 http://www.producao.usp.br/handle/BDPI/50444 One of the major advantages of the Layer-by-Layer (LbL) deposition technique is the possible control of molecular architecture, not only to achieve optimized properties but also to seek synergy among different materials. In this study, LbL films containing nanoclusters of a Keggin type polyoxometalate, phosphotungstic acid (HPW), alternated with the polycation poly(allylamine hydrochloride) (PAH) were deposited on indium-tin oxide (ITO) substrates. The electrochemical properties of the hybrid LbL film investigated in acidic conditions indicated no significant desorption of HPW, when a layer of poly(dimethylsiloxane) terminated with 3-aminopropyl groups (PDMS) was previously deposited on the ITO substrate. Such effect occurred because PDMS prevents desorption of HPW from the hybrid film, asshown by X-ray Photoelectron Spectroscopy (XPS) analyses. The porous structures of the films were revealed by Fourier transform infrared reflection absorption spectroscopy, scanning electron microscopy and XPS. PDMS/PAH as a pre-coating allowed the HPW/PAH films to be sensitive to the electrochemical detection of the triazines atrazine and melamine. In conclusion, the precise control of the LbL films architecture is important to develop opportunities for new applications.

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Electrocatalysis of the hydrogen evolution reaction by nanocomposites of poly(amidoamine)-encapsulated platinum nanoparticles and phosphotungstic acid

Cited by 48 publications

References 36 publications

Solid-state electrochemical behavior of Keggin-type borotungstic acid single crystal

Solid-state electrochemical behavior of Keggin-type borotungstic acid single crystal

Controlled Growth of Pt Nanowires on Carbon Nanospheres and Their Enhanced Performance as Electrocatalysts in PEM Fuel Cells

Poly(dimethylsiloxane) as a pre-coating in layer-by-layer films containing phosphotungstate nanoclusters electrochemically sensitive toward s-triazines

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