Direct Oxidation of Methanol on Self-Supported Nanoporous Gold Film Electrodes with High Catalytic Activity and Stability

Yu, Chuanfang; Jia, Falong; Ai, Zhihui; Zhang, Lizhi

doi:10.1021/cm701939v

Cited by 122 publications

(79 citation statements)

References 23 publications

(42 reference statements)

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“…The Au microwires of 200-mm-diameter with seamless solid/ nanoporous architecture (Fig. 2a) are produced by in situ electrochemical alloying/dealloying protocol in an electrolyte composed of ZnCl 2 and benzyl alcohol (BA) 31 , during which Au-Zn alloys are firstly formed via the electrodeposition of zinc, and the less noble Zn is then selectively dissolved in the dealloying process for the formation of nanoporous layer with high surface area ( Supplementary Fig. S1) 32 .…”

Section: Resultsmentioning

confidence: 99%

“…The seamless S/NPG wires were prepared by a multicyclic electrochemical alloying/dealloying method based on a threeelectrode electrochemical cell (Iviumstat electrochemical analyzer, Ivium Technology), in which Zn plate and wire were used as the auxiliary electrode and the reference electrode in a BA electrolyte containing 1.5 M ZnCl 2 , respectively 31 . 3D bicontinuous nanoporous layer with tunable microstructural features was decorated on polished Au wires with diameters of B200 mm after the electrochemical cycles in the potential range from À 0.72 to 1.88 V (versus Zn) at different conditions (Supplementary Table S1) 31 . After acetone, ethanol and deionized water (18.2 MO cm) rinsing in sequence, the seamless S/NPG wire fixed on a plastic clamp was moved into the Teflon-lined stainless steel autoclave filled with the mixture of 3, 6, 9 mM Co(NO 3 ) 2 , 2 mM cetyltrimethylammonium bromide, 5 ml pure water and 30 ml ethanol.…”

Section: Methodsmentioning

confidence: 99%

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Nanoporous gold supported cobalt oxide microelectrodes as high-performance electrochemical biosensors

et al. 2013

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Tremendous demands for electrochemical biosensors with high sensitivity and reliability, fast response and excellent selectivity have stimulated intensive research on developing versatile materials with ultrahigh electrocatalytic activity. Here we report flexible and self-supported microelectrodes with a seamless solid/nanoporous gold/cobalt oxide hybrid structure for electrochemical nonenzymatic glucose biosensors. As a result of synergistic electrocatalytic activity of the gold skeleton and cobalt oxide nanoparticles towards glucose oxidation, amperometric glucose biosensors based on the hybrid microelectrodes exhibit multi-linear detection ranges with ultrahigh sensitivities at a low potential of 0.26 V (versus Ag/AgCl). The sensitivity up to 12.5 mA mM À 1 cm À 2 with a short response time of less than 1 s gives rise to ultralow detection limit of 5 nM. The outstanding performance originates from a novel nanoarchitecture in which the cobalt oxide nanoparticles are incorporated into pore channels of the seamless solid/nanoporous Au microwires, providing excellent electronic/ionic conductivity and mass transport for the enhanced electrocatalysis.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Nanoporous gold supported cobalt oxide microelectrodes as high-performance electrochemical biosensors

et al. 2013

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“…Although the size effect has been extensively studied, [8] the influence of surface structure of nanostrutures as electrocatalysts is still in the focus of investigations. [9][10][11] Different crystal surfaces or directions may exhibit different physical and chemical properties due to the anisotropic properties of crystals. For example, the {111}, {110} and {100} surfaces of a face-centred cubic (fcc) metal, such as gold, show differences not only in the surface atom density, but also in the electronic structures and the resulting chemical reactivity.…”

Section: Introductionmentioning

confidence: 99%

“…Gold is generally considered as an inert metal toward methanol oxidation, [30][31][32] but an advantage of gold as catalyst is that the poisoning intermediates are not formed, and recent studies [6,7,[9][10][11][30][31][32] discovered that Au could exhibit an unusually high electrocatalytic activity. The electrocatalytic activity was attributed to the size and shape and the initial results showed that gold could be a promising candidate for the electrocatalytic oxidation of methanol.…”

Section: Introductionmentioning

confidence: 99%

Reactivity of Gold Nanobelts with Unique {110} Facets

2010

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Gold nanobelts were synthesized by directional solidification of the Fe-Au eutectoid followed by selective phase dissolution. Cleaning from organic molecules was performed in alkaline solution by PbO(2) deposition/dissolution to avoid surface reconstruction. The electrochemical behaviour of the Au nanobelts was determined by structure-sensitive electrochemical reactions, and the findings confirm the results obtained by selected area electron diffraction (SAED). The underpotential deposition (UPD) of lead under alkaline conditions and cyclic voltammograms (CVs) in sulphuric acid revealed an unusual large amount of (110) domains (>65%). Finally, after cleaning the Au nanobelts showed a higher and stable electrocatalytic behaviour toward methanol oxidation in alkaline media. The possible mechanism and the potential applications of the Au nanobelts are discussed.

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“…Several methods, such as electrochemical deposition, 28,29 electrochemical erosion, 30 electrochemical oxidation/chemical reduction processes, 31 chemical dealloying of alloys, [32][33][34] electrochemical alloying/dealloying, [35][36][37] and template synthesis, [38][39][40] were reported to be used to prepare nanostructure materials. However, the catalytic activities of NSG electrodes prepared by electrochemical erosion and electrochemical oxidation/chemical reduction are low.…”

Section: Introductionmentioning

confidence: 99%

Detection of femtomolar level osteosarcoma-related gene via a chronocoulometric DNA biosensor based on nanostructure gold electrode

Zhong¹

2012

IJN

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Abstract:In this paper, a sensitive chronocoulometric deoxyribonucleic acid (DNA) biosensor based on a nanostructure gold electrode was fabricated for detection of the femtomolar level survivin gene which was correlated with osteosarcoma by using hexaamine-ruthenium III complexes, [Ru(NH 3 , as the electrochemical indicator. The effect of different frequencies on the real surface area of the nanostructure gold electrode obtained by repetitive square-wave oxidation reduction cycle was investigated. At the optimal frequency of 8000 Hz, the real surface of the developed nanostructure gold electrode was about 42.5 times compared with that of the bare planar gold electrode. The capture probe DNA was immobilized on the nanostructure gold electrode and hybridized with target DNA. Electrochemical signals of hexaamine-ruthenium III bound to the anionic phosphate of DNA strands via electrostatic interactions were measured by chronocoulometry before and after hybridization. The increase of the charges of hexaamineruthenium III was observed upon hybridization of the probe with target DNA. Results indicate that this DNA biosensor could detect the femtomole (fM) concentration of the DNA target quantitatively in the range of 50 fM to 250 fM; the detection limit of this DNA biosensor was 5.6 fM (signal to noise = 3). This new biosensor exhibits excellent sensitivity and selectivity and has been used for an assay of polymerase chain reaction (PCR) with a satisfactory result.

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Direct Oxidation of Methanol on Self-Supported Nanoporous Gold Film Electrodes with High Catalytic Activity and Stability

Cited by 122 publications

References 23 publications

Nanoporous gold supported cobalt oxide microelectrodes as high-performance electrochemical biosensors

Nanoporous gold supported cobalt oxide microelectrodes as high-performance electrochemical biosensors

Reactivity of Gold Nanobelts with Unique {110} Facets

Detection of femtomolar level osteosarcoma-related gene via a chronocoulometric DNA biosensor based on nanostructure gold electrode

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