Investigation of electrocatalytic activity of the nanostructured Au–Cu catalyst deposited on the titanium surface towards borohydride oxidation

Tamašauskaitė–Tamašiūnaitė, Loreta; Balčiūnaitė, Aldona; Zabielaitė, Aušrinė; Stankevičienė, Ina; Kepenienė, Virginija; Selskis, Algirdas; Juškėnas, Remigijus; Norkus, Eugenijus

doi:10.1016/j.jelechem.2013.04.011

Cited by 14 publications

(12 citation statements)

References 49 publications

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“…Higher activity of the AuCu/GR catalysts with the Au:Cu molar ratios equal to 1:13 and 1:32 toward the oxidation of BH 4 − ions can be ascribed to the synergistic effect of Au and Cu metal particles and Au-Cu alloy formation as described in Refs. 26,28, and 33-37. Additionally, the mentioned effect could be related to different electrochemically active surface areas of Au in the investigated catalysts.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Borohydride Oxidation on Graphene Supported Gold-Copper Nanocomposites

Tamašauskaitė–Tamašiūnaitė

Baronaitė

Stankevičienė

et al. 2014

J. Electrochem. Soc.

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In this study the AuCu/GR catalysts with different Au:Cu molar ratios were prepared by microwave heating of Au(III) and Cu(II) salts in ethylene glycol (EG) solutions at 150 • C for 30 min. It has been determined that the composition of AuCu/GR depends on pH of the reaction mixture. When the reaction mixture pH was 7.0, 10.1 and 12.2, the AuCu/GR catalysts with the Au:Cu molar ratios equal to 37:1, 1:13 and 1:32, respectively, were synthesized. The structure and composition of the prepared catalysts were examined by XRD and ICP-OES. The shape and size of catalyst particles were determined by TEM. It has been found that the graphene supported AuCu catalysts with the Au:Cu molar ratios equal to 1:13 and 1:32 show an enhanced electrocatalytic activity toward the oxidation of BH 4 − ions compared with those of the bare Au/GR and Cu/GR catalysts.

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Section: Resultsmentioning

confidence: 99%

Investigation of Borohydride Oxidation on Graphene Supported Gold-Copper Nanocomposites

Tamašauskaitė–Tamašiūnaitė

Baronaitė

Stankevičienė

et al. 2014

J. Electrochem. Soc.

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“…Bi-metallic or multi-metallic systems with non-precious transition metals such as Au-Cu [14], Au-Co [15][16][17], Au-Fe [18], Au-Ni [19][20][21], Au-Zn [22], Ag-Cu [23], Pt-Cu [24], Pt-Co [25][26][27], Pt-Ni [27], Pt-Zn [28], Pd-Zn [29], Au/Co/Cu [16] and Cu-Ni-AuNi [30] have been developed. Recent electrochemical studies suggest that the employment of the Pt-or Aubased binary electrocatalysts, denoted as PtM or AuM (M = Co, Ni, Cu, Fe, Zn), not only permits controlling the content of the catalyst, but also definitely improves catalytic characteristics like activity and stability towards the BOR as compared to those of monometallic ones and, therefore, these catalysts are highly preferred [14,17,22,26,27,[31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Investigation of stability of gold nanoparticles modified zinc–cobalt coating in an alkaline sodium borohydride solution

Zabielaitė¹,

Šimkūnaitė²,

Balčiūnaitė³

et al. 2020

chemija

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The electrochemical stability and durability of ZnCo alloy thin layers deposited on the titanium surface (denoted as ZnCo/Ti) and those modified by small amounts of Au nanoparticles (denoted as AuZnCo/Ti) prepared via the electrochemical metal deposition technique and a simple galvanic displacement have been investigated in alkaline sodium borohydride (NaBH4) solutions. The physical properties of the fabricated AuZnCo/Ti catalysts have been examined using field emission scanning electron microscopy (FESEM), energy dispersive X-ray analysis (EDX) and inductively coupled plasma optical emission spectroscopy (ICP-OES). The electrocatalytic activity of the ZnCo/Ti and AuZnCo/Ti catalysts toward the oxidation of NaBH4 has been evaluated in an alkaline medium using cyclic voltammetry (CV) and chronoamperometry (CA), whereas the catalytic efficiency of the catalysts for the hydrolysis reaction of NaBH4 has been also examined by measuring the amount of generated hydrogen via the classic water-displacement method. It has been determined that the modification of the ZnCo alloy coating by Au nanoparticles apparently improves not only the morphology and structure of the catalyst, but also the activity and stability of the one for the oxidation of NaBH4 in an alkaline medium as compared to those of ZnCo/Ti and bare Au. The AuZnCo/Ti catalysts that have Au loadings of 63 and 306 µg cm–2 give ca. 12 and 11, respectively, times higher NaBH4 oxidation current densities as compared to those of the bare Au catalyst. Moreover, the AuZnCo/Ti catalysts catalyze the hydrolysis reaction of NaBH4 in alkaline solutions.

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“…One way to reduce the Au amount is to disperse Au nanoparticles on a technologically relevant substrate or to use Au‐based catalysts. Recently, alloying of Au with transition metals, such as Ni , Co , , , Cu , and Fe , , allows reducing its cost and provides better catalytic characteristics for the oxidation of BH 4 − . It has been determined that bimetallic catalysts usually show a higher activity and stability than monometallic ones .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, TiO 2 ‐NTs have been applied for fabrication of catalysts due to their easy preparation, high orientation, large surface area, high uniformity, non‐toxicity, chemical and electrochemical stability and low production costs, which makes them valuable functional materials in many areas . In this study nano‐scale gold‐cobalt catalysts deposited on the TiO 2 ‐NTs surface (denoted as Au(Co)/TiO 2 ‐NTs) were fabricated using the galvanic displacement technique , , , , . The morphology and composition of the prepared catalysts were characterized by means of field emission scanning electron microscopy (FESEM), energy dispersive X‐ray analysis (EDX) and inductively coupled plasma optical emission spectroscopy (ICP‐OES).…”

Section: Introductionmentioning

confidence: 99%

Au Nanoparticles Modified Co/Titania Nanotubes as Electrocatalysts for Borohydride Oxidation

Balčiūnaitė

Tamašauskaitė–Tamašiūnaitė

Santos

et al. 2017

Fuel Cells

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Gold‐cobalt catalysts were deposited on the surface of titania nanotubes (TiO2‐NTs) via galvanic displacement technique. The catalysts were characterized using field emission scanning electron microscopy, energy dispersive X‐ray spectroscopy and inductively coupled plasma optical emission spectroscopy. The electrocatalytic activity of the Au(Co)/TiO2‐NTs catalysts was examined in respect to the oxidation of BH4− ions in an alkaline media by cyclic voltammetry and chronoamperometry. It was found that the Au(Co)/TiO2‐NTs catalysts with Au loadings in the range of 10 up to 59 µgAu cm−2 had a higher activity compared to that of Co/TiO2‐NTs and bare Au. A direct NaBH4‐H2O2 single fuel cell was constructed with the Au(Co)/TiO2‐NTs catalysts as anode and Pt as the cathode. The fuel cell exhibited an open circuit voltage of ca. 1.9 V and peak power densities up to 217 mW cm−2 at 25 °C. The highest specific peak power density of 16.3 kW g−1Au was obtained when employing Au(Co)/TiO2‐NTs with the Au loading of 10 µgAu cm−2 as the anode catalyst.

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Investigation of electrocatalytic activity of the nanostructured Au–Cu catalyst deposited on the titanium surface towards borohydride oxidation

Cited by 14 publications

References 49 publications

Investigation of Borohydride Oxidation on Graphene Supported Gold-Copper Nanocomposites

Investigation of Borohydride Oxidation on Graphene Supported Gold-Copper Nanocomposites

Investigation of stability of gold nanoparticles modified zinc–cobalt coating in an alkaline sodium borohydride solution

Au Nanoparticles Modified Co/Titania Nanotubes as Electrocatalysts for Borohydride Oxidation

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