Morphology control of noble metal catalysts from planar to dendritic shapes by galvanic displacement

Baek, Seungyeon; Kim, Kwang Hwan; Kim, Myung Joon; Kim, Jae Jeong

doi:10.1016/j.apcatb.2017.05.094

Cited by 18 publications

(11 citation statements)

References 40 publications

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“…In the past reports, many transition metal nano-catalysts have been synthesized by co-precipitation [51], chemical reduction, combustion synthesis [52], galvanic displacement [53], impregnation [54], and alloying [55]. Among them, alloying is an effective strategy to improve catalytic activity and hydrogen selectivity [55].…”

Section: Ni-pt Nanoalloyingmentioning

confidence: 99%

Pt-Ni Nanoalloys for H2 Generation from Hydrous Hydrazine

Luo¹,

Wan

et al. 2020

Catalysts

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Hydrous hydrazine (N2H4∙H2O) is a candidate for a hydrogen carrier for storage and transportation due to low material cost, high hydrogen content of 8.0%, and liquid stability at room temperature. Pt and Pt nanoalloy catalysts have been welcomed by researchers for the dehydrogenation of hydrous hydrazine recently. Therefore, in this review, we give a summary of Pt nanoalloy catalysts for the dehydrogenation of hydrous hydrazine and briefly introduce the decomposition mechanism of hydrous hydrazine to prove the design principle of the catalyst. The chemical characteristics of hydrous hydrazine and the mechanism of dehydrogenation reaction are briefly introduced. The catalytic activity of hydrous hydrazine on different supports and the factors affecting the selectivity of hydrogen catalyzed by Ni-Pt are analyzed. It is expected to provide a new way for the development of high-activity catalysts for the dehydrogenation of hydrous hydrazine to produce hydrogen.

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Section: Ni-pt Nanoalloyingmentioning

confidence: 99%

Pt-Ni Nanoalloys for H2 Generation from Hydrous Hydrazine

Luo¹,

Wan

et al. 2020

Catalysts

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“…Galvanic displacement [44] of Pt on previously electrochemically deposited Ag nanoparticles yielded bimetallic Ag-core Pt-shell-like particles (AgPt). In this regard, some Ag atoms oxidise to Ag + in solution, while the PtCl62− ions reduce to Pt metal, as described by Equation (3) [49], so the surface of the previously deposited Ag nanoparticles is spontaneously covered towards the formation of core-shell-like particles.…”

Section: Resultsmentioning

confidence: 99%

“…The silver pseudo-reference electrode of the Ag X @SPCE (X = S or L) was carefully covered with parafilm @ M prior to its immersion into the H 2 PtCl 6 solution. In this way, Pt deposition by galvanic displacement [44] took place exclusively on the Ag particles surface, so the silver pseudo-reference electrode was unaffected (Figure S3, Supplementary Material). As a result, the electrodes stand for AgPt S @SPCE and AgPt L @SPCE when using standard and leaching solutions, respectively.…”

Section: Methodsmentioning

confidence: 99%

Design and Characterization of Effective Ag, Pt and AgPt Nanoparticles to H2O2 Electrosensing from Scrapped Printed Electrodes

Gómez‐Monedero

González-Sánchez

Iniesta

et al. 2019

Sensors

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The use of disposable screen-printed electrodes (SPEs) has extraordinarily grown in the last years. In this paper, conductive inks from scrapped SPEs were removed by acid leaching, providing high value feedstocks suitable for the electrochemical deposition of Ag, Pt and Ag core-Pt shell-like bimetallic (AgPt) nanoparticles, onto screen-printed carbon electrodes (ML@SPCEs, M = Ag, Pt or AgPt, L = metal nanoparticles from leaching solutions). ML@SPCEs were characterized by scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The results were compared to those obtained when metal nanoparticles were synthesised using standard solutions of metal salts (MS@SPCEs). Both ML@SPCEs and MS@SPCEs exhibited similar cyclic voltammetric patterns referred to the electrochemical stripping of silver or the adsorption/desorption of hydrogen/anions in the case of platinum, proving leaching solutions extremely effective for the electrodeposition of metallic nanoparticles. The use of both ML@SPCEs and MS@SPCEs proved effective in enhancing the sensitivity for the detection of H2O2 in phosphate buffer solutions (pH = 7). The AgPtL@SPCE was used as proof of concept for the validation of an amperometric sensor for the determination of H2O2 within laundry boosters and antiseptic samples. The electrochemical sensor gave good agreement with the results obtained by a spectrophotometric method with H2O2 recoveries between 100.6% and 106.4%.

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“…The formation of the precipitate from the reduced metal on the surface of sacrificial metals begins with the nucleation of nanoclusters (MNCs) during the galvanic replacement reactions. During the GR they grow with the formation of 1) a porous coating at high cathode polarization [13] , [14] , or 2) the dendritic coating at low cathodic polarization [15] , [16] , that is schematically illustrated on Fig. 1 .…”

Section: Introductionmentioning

confidence: 99%