The effective carbon supported core–shell structure of Ni@Au catalysts for electro-oxidation of borohydride

Duan, Donghong; Jiang, Liang; Liu, Huihong; You, Xiu Dong; Wei, Huikai; Wei, Guoqiang; Liu, Shibin

doi:10.1016/j.ijhydene.2014.10.101

Cited by 78 publications

(42 citation statements)

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“…In Fig. 4b-f, a pair of redox peaks b2 and b4 appearing at 0.5 and 0.3 V have also been observed in alkaline solution, which correspond to the oxidation-reduction processes of nickel hydroxide [24,35]. The occurrence of nickel hydroxide indicated that the Ni nanoparticles were not wrapped up by Ag completely.…”

Section: Cyclic Voltammetrymentioning

confidence: 82%

“…Many kinds of core-shell nanoparticles were prepared and used as electrocatalysts for fuel cells [31][32][33][34]. In particular, we prepared Ni@Au/C and Cu@Ag/C core-shell nanopaticles which were used as anode electrocatalysts in DBHFC, and the results indicated that the Ni@Au/C and Cu@Ag/C catalysts exhibit higher catalytic activity for the direct electrooxidation of borohydride compared with Au/C or Ag/C [35,36]. Besides, Baletto et al [37] found that, in molecular dynamics simulations of the growth of bimetallic AgNi clusters, AgNi clusters could prefer to form a core-shell structure because this compound shows a strong tendency to phase separation in the bulk with Ag segregating at the surface.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of carbon-supported Ni@Ag core-shell nanoparticles as electrocatalyst for electrooxidation of sodium borohydride

Duan

Wang

Liu

et al. 2016

J Solid State Electrochem

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Carbon-supported Ni@Ag core-shell nanoparticles were synthesized and used as the anode electrocatalyst for direct borohydride-hydrogen peroxide fuel cell (DBHFC). The morphology, structure, and composition of the asprepared electrocatalysts are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). Electrochemical characterizations are performed by cyclic voltammetry (CV), chronoamperometry (CA), linear scan voltammetry with rotating disk electrode (LSV RDE), and fuel cell test. The catalytic behaviors and main kinetic parameters (e.g., Tafel slope, number of electrons exchanged, exchange current density, and apparent activation energy) toward BH 4 -oxidation on Ag/C and Ni@Ag/C electrocatalysts are determined. Results show that the as-prepared nanoparticles have a core-shell structure with the average size approximately 13 nm. The kinetics of NaBH 4 oxidation is faster for Ni@Ag/C than that for Ag/C. Among the as-prepared catalysts, the highest transition electron value and the lowest apparent activation energy are obtained on Ni 1 @Ag 1 /C; the values are 4.8 and 20.23 kJ mol −1 , respectively. The DBHFC using Ni 1 @Ag 1 /C as anode electrocatalyst and Pt mesh (1 cm 2 ) as cathode electrode obtains the maximum anodic power density as high as 8.54 mW cm − 2 at a discharge current density of 8.42 mA cm −2 at 25°C.

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Section: Cyclic Voltammetrymentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Investigation of carbon-supported Ni@Ag core-shell nanoparticles as electrocatalyst for electrooxidation of sodium borohydride

Duan

Wang

Liu

et al. 2016

J Solid State Electrochem

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“…A core-shell structure is one solution to reducing anode catalyst cost, improving utilization and enhancing the performance of DFAFCs electrooxidation processes. Core-shell bimetallic, unlike alloyed catalysts do not exhibit poor long-term stability because of dissolution of non-noble metals [39]. Recent research have shown that controlled synthesis strategy for preparing nanocatalysts produce well-defined and durable surface structures [40].…”

Section: Introductionmentioning

confidence: 99%

A new synthesis route for sustainable gold copper utilization in direct formic acid fuel cells

Oseghale

Abdalla

Posada

et al. 2016

International Journal of Hydrogen Energy

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Available online xxxKeywords: SynthesisCore-shell Catalyst Low-cost DFAFCs a b s t r a c tIn the efforts to develop a more sustainable energy mix there is an urgent need to develop new materials for environmentally friendly processes. Developing low metal loading anode catalyst with high electrocatalytic activity for liquid fuel cells remains a great challenge.Polyvinylpyrrolodone-protected AuCueC core-shell was fabricated by a facile one-pot modified chemical reduction method. The nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM) analyses. XRD analysis indicates the preferential orientation of catalytically active (111) planes in AuCueC core-shell nanoparticles. The inclusion of Cu in the AuCueC catalysts increased catalytic activities, which can be attributed to the increases lattice parameters.Comparative results show that AuCueC catalyst exhibited much better electrocatalytic activity and stabilization compared to commercial Au nanoparticle on carbon support catalyst. The high performance of AuCueC catalyst may be attributed to the electronic coupling or synergistic interaction between Cu core structure, and the Au shell makes it a promising for DFAFCs applications.

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“…It has been determined that bimetallic catalysts usually have higher activity and stability than the monometallic ones. [17][18][19][20][21][22][23][24][25][26] Moreover, bimetallic catalysts are of wide interest since they lead to many interesting size-dependent electrical, chemical and optical properties. Bimetallic NP catalysts are particularly important because they usually consist of a primary metal that has high electrocatalytic activity and a secondary metal that can either enhance the catalytic efficiency toward BOR or inhibit BH 4 − hydrolysis.…”

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confidence: 99%

AuCo/TiO₂-NTs Anode Catalysts for Direct Borohydride Fuel Cells

Santos

Balčiūnaitė

Tamašauskaitė–Tamašiūnaitė

et al. 2016

J. Electrochem. Soc.

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Gold-cobalt catalysts deposited on titania nanotubes surface (denoted as AuCo/TiO 2 -NTs) are studied as possible anode materials for direct borohydride/hydrogen peroxide fuel cells. The morphology and composition of the catalysts is characterized by field emission scanning electron microscopy and by inductively coupled plasma optical emission spectroscopy. The fuel cell measurements are performed at four temperatures, in the 25-55 • C range, on a lab-scale direct alkaline NaBH 4 -H 2 O 2 single fuel cell. Polarization curves are recorded to evaluate the fuel cell performance using each prepared anode catalyst. The peak power density dependence on temperature is in the 87-102 mWcm -2 range for Co/TiO 2 -NTs catalyst and in the 163-283 mWcm -2 range for the AuCo/TiO 2 -NTs catalysts with Au loadings ranging from 10 to 60 μg Au cm -2 . The present results demonstrate that power density is raised by over 150% due to the use of AuCo/TiO 2 -NTs as anode catalysts.The direct borohydride fuel cell (DBFC), using sodium borohydride (NaBH 4 ) aqueous solution as the fuel, has been the focus of many investigations during the last decade. 1-7 This low-temperature fuel cell has specific features that make it a promising power source for portable applications. Those features include high energy density (9.3 Wh g −1 at 1.64 V), low toxicity of its reactants and products, and their easy storage and good stability in alkaline solution. 1,[8][9][10][11] Noble metals like platinum (Pt) or gold (Au) have been extensively studied as anodes for borohydride (BH 4 − ) oxidation in DBFCs. But in contrast to Pt, which is also catalyst for the detrimental BH 4 − hydrolysis reaction, Au has demonstrated high coulombic efficiency for the borohydride oxidation reaction (BOR). However, the use of Au as an electrode material is limited by its high price. One way to reduce the Au amount is to disperse Au nanoparticles (NPs) on a technologically relevant substrate. [12][13][14][15][16] Recently, alloying Au with transition metals such as Ni, 17-21 Co 21-23 and Cu 20,24-26 enables reduced cost and better catalytic features for BOR. It has been determined that bimetallic catalysts usually have higher activity and stability than the monometallic ones. 17-26 Moreover, bimetallic catalysts are of wide interest since they lead to many interesting size-dependent electrical, chemical and optical properties. Bimetallic NP catalysts are particularly important because they usually consist of a primary metal that has high electrocatalytic activity and a secondary metal that can either enhance the catalytic efficiency toward BOR or inhibit BH 4 − hydrolysis. 20,27 The 3d transition metals (Fe, Co, Ni, Cu, Zn) are able to enhance the electrochemical activity of bimetallic catalysts for BH 4 − oxidation and reduce the total cost of the electrocatalyst. It has been shown that prepared Au-Co, Au-Ni and Au-Zn bimetallic catalysts with different ratios attained excellent electrochemical performances as anodes for the DBFC. [18][19][20][21][22][23]27 In the present ...

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The effective carbon supported core–shell structure of Ni@Au catalysts for electro-oxidation of borohydride

Cited by 78 publications

References 50 publications

Investigation of carbon-supported Ni@Ag core-shell nanoparticles as electrocatalyst for electrooxidation of sodium borohydride

Investigation of carbon-supported Ni@Ag core-shell nanoparticles as electrocatalyst for electrooxidation of sodium borohydride

A new synthesis route for sustainable gold copper utilization in direct formic acid fuel cells

AuCo/TiO₂-NTs Anode Catalysts for Direct Borohydride Fuel Cells

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The effective carbon supported core–shell structure of Ni@Au catalysts for electro-oxidation of borohydride

Cited by 78 publications

References 50 publications

Investigation of carbon-supported Ni@Ag core-shell nanoparticles as electrocatalyst for electrooxidation of sodium borohydride

Investigation of carbon-supported Ni@Ag core-shell nanoparticles as electrocatalyst for electrooxidation of sodium borohydride

A new synthesis route for sustainable gold copper utilization in direct formic acid fuel cells

AuCo/TiO2-NTs Anode Catalysts for Direct Borohydride Fuel Cells

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Product

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AuCo/TiO₂-NTs Anode Catalysts for Direct Borohydride Fuel Cells