Epitaxial Electrodeposition of Nickel on Pt(111) Electrode

Chen, Wanchung; Yen, Po-Yu; Kuo, Yenchung; Chen, Sihzih; Yau, Shuehlin

doi:10.1021/jp3040677

Cited by 13 publications

(18 citation statements)

References 55 publications

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“…3k and l reveal a long-range modulation of atomic heights in the first five layers of Co. This moire structure is similar to those observed with Ni on Pt(1 1 1) [33], and Co deposited on Pt(1 1 1) and Au(1 1 1) [16,21]. The present Co/Pt(1 1 1) moire pattern is modeled accordingly as a layer of hexagonal Co array stacked on the Pt(1 1 1) plane, which inevitably results in varying coordination sites for Co adatoms from 3-fold hollow to atop sites on the Pt(1 1 1) substrate.…”

Section: Growth Mode Of Co Deposit On Pt(1 1 1) Electrodesupporting

confidence: 77%

“…Also, the smaller periodicity suggests a reduction of Co lattice parameter, as also noted with Co deposition on Pt(1 1 1) in vacuum [16]. Furthermore, ultrathin film of Ni electrodeposited on Pt(11 1) exhibits the same structural changes [33]. Similar moire structures have been observed in many heteroepitaxial deposition systems [21,39,40].…”

Section: In Situ Stm Imaging Of Cobalt Depositionsupporting

confidence: 67%

“…1 are cyclic voltammograms (CVs) obtained with Pt(1 1 1) electrode in 0.1 M KClO 4 + 1 mM HCl without (panel a) and with (panels b and c) 0.04 M CoCl 2 , respectively. According to previous studies [32,33], features seen in panel (a), from positive to negative potentials, can be characterized as OH adsorption and desorption (A/A ), H deposition and stripping (B/B ), and the production and oxidation of hydrogen (C/C ), respectively. The onset potential for water reduction at the Pt (1 1 1) …”

Section: Methodsmentioning

confidence: 85%

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In situ scanning tunneling microscopy study of cobalt thin film electrodeposited on Pt(111) electrode

Kuo

Yen

Chen

et al. 2013

Electrochimica Acta

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Section: Growth Mode Of Co Deposit On Pt(1 1 1) Electrodesupporting

confidence: 77%

Section: In Situ Stm Imaging Of Cobalt Depositionsupporting

confidence: 67%

Section: Methodsmentioning

confidence: 85%

See 1 more Smart Citation

In situ scanning tunneling microscopy study of cobalt thin film electrodeposited on Pt(111) electrode

Kuo

Yen

Chen

et al. 2013

Electrochimica Acta

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“…Since these species adsorb and interact strongly with both the nickel and the Pt(111) substrate, they could be acting as surfactant agents. 77,78 Deflection signal and topography image of the selected area (red square).…”

Section: Analysis Of the Morphology Of The Ni Deposition On Pt Electrmentioning

confidence: 99%

Surface Sensitive Nickel Electrodeposition in Deep Eutectic Solvent

Sebastián

Giannotti

Gómez

et al. 2018

ACS Appl. Energy Mater.

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The first steps of nickel electrodeposition in a deep eutectic solvent (DES) are analysed in detail. Several substrates from glassy carbon to Pt(111) were investigated pointing out the surface sensitivity of the nucleation and growth mechanism. For that, cyclic voltammetry and chronoamperometry, in combination with scanning electron microscopy (SEM), were employed. X-ray diffraction (XRD) and atomic force microscopy (AFM) were used to more deeply analyse the Ni deposition on Pt substrates.In a 0.1 M NiCl 2 + DES solution (at 70ºC), the nickel deposition on glassy carbon takes place within the potential limits of the electrode in the blank solution. Although, the electrochemical window of Pt|DES is considerably shorter than on glassy carbon|DES, it was still sufficient for the nickel deposition. On Pt electrode, the negative potential limit was enlarged while the nickel deposit growed, likely because of the lower catalytic activity of the nickel towards the reduction of the DES. At lower overpotentials, different hydrogenated Ni structures were favoured, most likely because of the DES co-reduction on the Pt substrate. Nanometric metallic nickel grains of rounded shape were obtained in any substrate, as evidenced by the FE-SEM. Passivation phenomena, related to the formation of Ni oxide and Ni hydroxylated species, were observed at high applied overpotentials. At low deposited charge, on Pt(111) the AFM measurements showed the formation of rounded nanometric particles of Ni, which rearranged and formed small triangular arrays at sufficiently low applied overpotential (Scheme 1). This particle pattern was induced by the <111> orientation and related to surface sensitivity of the nickel deposition in DES. The present work provides deep insights into the Ni electrodeposition mechanism in the selected deep eutectic solvent. Scheme 1. Representation of the Ni(II) electrodeposition in DES on Pt(111) and AFM image (2 x 2 µm 2 ) of the Ni clusters.

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“…This result has been observed with heteroatom deposition, such as with cobalt and nickel on Au(111) and Pt(111) electrodes. [40][41][42] A few islands highlighted by dotted circles in Figure 6a are ascribed to aggregated gold atoms released from the Au(111) surface when its atomic structure was changed from the reconstructed to the (1 × 1) state. 43 Figure 6b shows a higher-resolution STM scan obtained at 0.1 V, in which the Pt deposit is covered with H atoms.…”

Section: Seiras Obtained With Co Adsorbed On the Pt/aumentioning

confidence: 99%

Carbon Monoxide Promoted Deposition of Ordered Pt Adlayer on Au(111) and Its Electrocatalytic Properties

Liao

Yau

2015

J. Electrochem. Soc.

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In situ scanning tunneling microscopy (STM) was used to examine the microstructures of platinum (Pt) deposited on ordered Au(111) substrate in aqueous Na 2 PtCl 6 solution saturated with carbon monoxide (CO) with and without potential control at room temperature. PtCl 6 2− complexes were reduced to Pt atoms by CO molecules and deposited on Au(111) in a hexagonal array without potential control. The adsorption of CO molecules first mobilized and rearranged Pt adatoms on Au(111) from disordered Pt aggregates to 0.9 nm wide tortuous stripes, and then to patches of ordered Pt adatoms at 0.1 V (versus reversible hydrogen electrode). Electrodeposition of Pt in the presence of CO ceased with a monatomic Pt film capped with CO molecules arranged in a (2 × 2) array at 0.1 V. The CO monolayer adsorbed on Pt/Au(111) was stripped off at 0.96 V in 0.1 M H 2 SO 4 , as compared with 0.83 V observed with Pt(111). The E 1/2 potential for oxygen reduction reaction (ORR) observed with the Pt-modified Au(111) electrode was 0.81 V in sulfuric acid, which is 0.16 V more positive than that of Pt(111). The microstructures of the as-prepared Pt monolayer on Au(111) changed with potential cycling between 0.05 and 1.0 V. Platinum (Pt) metal is active in catalyzing a number of electrochemical reactions, such as hydrogen evolution and oxidation, 1 oxidation of methanol, 2 and oxygen reduction reaction. 3,4 Since these electrochemical reactions all occur at the interface of the Pt electrode, it is important to learn the electrochemical characteristics of ultrathin Pt film, which can lead to cost-effective uses of Pt. The preparation and characterization of thin Pt films have been studied in the last decade and has been reviewed. 5 Substrates for Pt deposition range from noble transition metal substrates (Au, Ru, and so on), 6,7 to semiconductors (silicon 8 and TiO 2 9 ), carbon materials (graphite, 10,11 carbon nanotubes 12,13 ), and polymers (polyaniline, 14 Nafion 15 ). These Pt-modified electrodes yield new uses in electrocatalysis and electroanalysis.Of close relevance to this study -Pt deposited on gold substrate -has been examined in vacuum and electrochemical environments. 6,16-20 Scanning tunneling microscopy (STM) has been used to study Pt electrodeposition on Au(111) and Au(100) ordered electrodes, which reveals that Pt nucleates preferentially in steps, and develops into 3D clusters and cauliflower type clusters on these substrates, 21 while X-ray diffraction shows epitaxial deposition of Pt on Au(111) electrode with Pt adatoms occupying face-center cubic (fcc) three-fold sites. 18,22 Smooth Pt monolayers have been prepared by galvanic replacement of a predeposited Cu layer 19,20 or by electrodeposition in the presence of carbon monoxide, whose adsorption on Pt deposit hindered further Pt reduction. 23 As for preparing multilayer Pt films, a self-terminating electrodeposition process in K 2 PtCl 4 -NaCl electrolyte has been devised, which allows control over morphology and film thickness. 24 We employed in situ STM and infrared spe...

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Epitaxial Electrodeposition of Nickel on Pt(111) Electrode

Cited by 13 publications

References 55 publications

In situ scanning tunneling microscopy study of cobalt thin film electrodeposited on Pt(111) electrode

In situ scanning tunneling microscopy study of cobalt thin film electrodeposited on Pt(111) electrode

Surface Sensitive Nickel Electrodeposition in Deep Eutectic Solvent

Carbon Monoxide Promoted Deposition of Ordered Pt Adlayer on Au(111) and Its Electrocatalytic Properties

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