A direct NaBH4–H2O2 fuel cell using Ni foam supported Au nanoparticles as electrodes

Cao, Dianxue; Gao, Yinyi; Wang, Guiling; Miao, Rongrong; Liu, Yao

doi:10.1016/j.ijhydene.2009.11.026

Cited by 130 publications

(75 citation statements)

References 36 publications

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“…Obviously, direct borohydride-hydrogen peroxide fuel cell (DBHFC), which uses borohydride in alkaline electrolyte as fuel and hydrogen peroxide in acid as oxidant, can yield a theoretical cell voltage as high as 3.01 V. However, the borohydride oxidation reaction (BOR) pathway occurs depending on the anode catalyst material, solution composition, temperature, and so on [4][5][6][7]. Usually, a quasi-spontaneous heterogeneous hydrolysis occurs in competition with the eightelectron borohydride oxidation reaction.…”

Section: Introductionmentioning

confidence: 99%

“…In the past few years, various metals have been studied as the anode electrocatalysts for DBFC, such as Pt [9][10][11], Pd [12,13], Ni [14,15], Cu [16], Co [17,18] known as Bcatalytic electrodes,^and Au [4,5,19,20], Ag [4,10,11,21], known as Bnon-catalytic electrodes.^Although Ag exhibits excellent activity toward the oxidation of borohydride and is presented as a non-catalytic material with respect to BH 4 -hydrolysis, the slow electrode kinetics and low power densities indicate that Ag cannot be used alone [11,22]. Thus, it is essential to design new and effective Ag-based composite catalysts with superior performance.…”

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: Introductionmentioning

confidence: 99%

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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“…One of the ways to reduce the amount of Au is to disperse small Au particles (in order of a few nanometers) on a technologically relevant substrate. Alloying Au with transition metals such as Ni (17)(18)(19)(20)(21)(22)(23), Co (20,(23)(24)(25) and Cu (20,(26)(27)(28) also allows reducing its cost and provides mostly better catalytic characteristics for the oxidation of BH 4 − . It has been determined that bimetallic catalysts usually show a higher activity and stability than the monometallic ones.…”

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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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“…Chronoamperometry results demonstrated a fast signal response, and the sensitivity was determined as 1.56 ± 0.13 μA/100 μM based on the present disk electrode. The use of sodium borohydride in portable power systems has attracted increasing interest in hydrogen and fuel cell applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] since Amendola et al developed a direct borohydride fuel cell (DBFC) with high power density 17 and a portable hydrogen generator using borohydride hydrolysis.18 Theoretically, sodium borohydride has the capability of transferring 8 electrons per molecule at a low electrode potential of −1.24 V SHE theoretically providing a high specific energy of 9,296 Wh kg −1 (based on 1.64 V cell voltage corresponding to oxygen reduction at the cathode). However, the spontaneous hydrolysis of sodium borohydride, (which is the objective in a hydrogen generator) reduces the Faradic efficiency in practical DBFC applications.…”

mentioning

confidence: 99%

“…The electron transfer number indicated in the Fig. 1 Gold, which has generally been described in the literature as inactive for the hydrolysis of borohydride and the oxidation of hydrogen, [8][9][10][11][12][13][14][15][16][17] was first proposed in 1991 as an electrode for the determination of borohydride concentration. 31 There is no other reference reporting the electrochemical detection of borohydride.…”

mentioning

confidence: 99%

Electrochemical Detection of Sodium Borohydride in Alkaline Media by Gold Electrode

Hou

Ellis

Moore

2012

Electrochem. Solid-State Lett.

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Direct borohydride fuel cells (DBFC) are emerging as a promising technology for portable power. The characteristics of a gold electrochemical sensor for detecting borohydride concentration were investigated. Although gold is not Faradically efficient for the borohydride oxidation, the peak current obtained from cyclic voltammetry (CV) showed a linear relationship in the investigated range of 0.1 mM-50 mM borohydride concentration with a detect limitation of 50 μM, suggesting the same charge transfer mechanism within the investigated concentration range. Chronoamperometry results demonstrated a fast signal response, and the sensitivity was determined as 1.56 ± 0.13 μA/100 μM based on the present disk electrode. The use of sodium borohydride in portable power systems has attracted increasing interest in hydrogen and fuel cell applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] since Amendola et al. developed a direct borohydride fuel cell (DBFC) with high power density 17 and a portable hydrogen generator using borohydride hydrolysis.18 Theoretically, sodium borohydride has the capability of transferring 8 electrons per molecule at a low electrode potential of −1.24 V SHE theoretically providing a high specific energy of 9,296 Wh kg −1 (based on 1.64 V cell voltage corresponding to oxygen reduction at the cathode). However, the spontaneous hydrolysis of sodium borohydride, (which is the objective in a hydrogen generator) reduces the Faradic efficiency in practical DBFC applications. Although the use of alkaline media with pH > 12 or at least the ratiocan be employed to suppress hydrolysis, 19 hydrogen evolution is still observed at the electrode surface during the electrochemical oxidation of sodium borohydride. 3,20,21 The direct electrochemical oxidation of sodium borohydride, is complex as illustrated in Figure 1, which shows only the boron related species, electrons and hydrogen involved in the reactions. The scheme in Fig. 1 is generally applicable to the chemicalelectrochemical (CE) and/or direct electrochemical oxidation on catalytic metals, i.e. Pt. 20,[22][23][24][25] For a multi-electron transfer process, a stepwise mechanism is usually followed, which means the hydrolysis of intermediates will possibly further decrease the number of electrons transferred. The electron transfer number indicated in the Fig. 1 Gold, which has generally been described in the literature as inactive for the hydrolysis of borohydride and the oxidation of hydrogen, [8][9][10][11][12][13][14][15][16][17] was first proposed in 1991 as an electrode for the determination of borohydride concentration. 31 There is no other reference reporting the electrochemical detection of borohydride. Very recently, it was found that gold is not a faradically efficient electrocatalyst for the electrochemical oxidation of borohydride (i.e., electron transfer number, n ∼ 4-6 at room temperature in 1 M NaOH).25, 32 Here we investigate whether gold, in spite of its limited faradaic efficiency, can be used as an electrochemical sensor...

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A direct NaBH4–H2O2 fuel cell using Ni foam supported Au nanoparticles as electrodes

Cited by 130 publications

References 36 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

Investigation of Borohydride Oxidation on Graphene Supported Gold-Copper Nanocomposites

Electrochemical Detection of Sodium Borohydride in Alkaline Media by Gold Electrode

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