Electrochemical growth of gold nanostructures on carbon paper for alkaline direct glucosefuel cell

Tung, Sze Ping; Huang, Ting; Lee, Chi Young; Chiu, Hsin‐Tien

doi:10.1039/c1ra00611h

Cited by 49 publications

(75 citation statements)

References 31 publications

(50 reference statements)

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“…Indeed, the Au nanocoral electrode has 35-fold higher Au content than Au/C. Furthermore, among the nanostructures obtained by the electrodeposition (see Figure 3), Au nanocorals exhibit the best electrocatalytic activity that is 1.54-and 2.2-fold higher than AuNPs and the sputtered Au film electrodes, respectively [44]. This has been ascribed to its structure, especially the presence of Au(1 1 0) facets [43,44].…”

Section: Support Effect: Performances Of Carbon Supported Gold Nanopamentioning

confidence: 90%

“…The electrodeposition is achieved by applying a voltage of 1.6-1.8 V for at least 18 h in an aqueous mixture of HAuCl 4 , NaNO 3 , and cetyltrimethylammonium chloride (CTAC). The surfactant CTAC acts as a capping agent to reduce the surface energy and controls the growth and shape of nanostructures, while NO 3 − is expected to increase the conductivity of the solution and oxidize less stable Au facets back into AuCl 4 − [44,45]. This leads to a high Au amount (>2.5 mg cm −2 ) [44].…”

Section: Synthesis Of Gold Nanoparticles Supported On Carbon Substratesmentioning

confidence: 99%

“…In addition, it was found that 12.2 wt.% of Au particles are located inside the fibers, thus inaccessible. Furthermore, the group of Hsin-Tien Chiu has developed several electrodeposition methods that enable the growth of Au nanostructures on carbon paper: nanoparticles ( Figure 3B), nanocorals ( Figure 3C), and branched belt ( Figure 3D) [43,44]. The electrodeposition is achieved by applying a voltage of 1.6-1.8 V for at least 18 h in an aqueous mixture of HAuCl 4 , NaNO 3 , and cetyltrimethylammonium chloride (CTAC).…”

Section: Synthesis Of Gold Nanoparticles Supported On Carbon Substratesmentioning

confidence: 99%

“…The surfactant CTAC acts as a capping agent to reduce the surface energy and controls the growth and shape of nanostructures, while NO 3 − is expected to increase the conductivity of the solution and oxidize less stable Au facets back into AuCl 4 − [44,45]. This leads to a high Au amount (>2.5 mg cm −2 ) [44]. The electrochemical characterizations combined TEM ( Figure 3E) and selected area electron diffraction (SAED) pattern ( Figure 3F) suggested that the surface structure of the nanocorals resembles that of the branched belt, with highly exposed Au(1 1 0) planes [43].…”

Section: Synthesis Of Gold Nanoparticles Supported On Carbon Substratesmentioning

confidence: 99%

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Electrochemical Reactivity at Free and Supported Gold Nanocatalysts Surface

Hebié¹,

Holade²,

Servat³

et al. 2016

Catalytic Application of Nano-Gold Catalysts

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This chapter presents an overview on size, structure, morphology, composition as well as the effect of the support on the electrocatalytic properties of gold nanoparticles (AuNPs). It was found that the electrocatalytic properties of unsupported AuNPs strongly depend on their size and shape. Consequently, the electrocatalytic properties of AuNPs can be tuned. Furthermore, to design high-performance electrocatalysts with minimal precious metal content and cost, the direct immobilization of metal NPs onto carbon-based substrates during their synthesis constitutes another elegant alternative and has been thoroughly examined. These "easy-to-use" supports as scaffolds for AuNPs, namely carbon black, carbon paper, etc., offer beneficial contributions. Indeed, thanks to their high available surface area, good electronic conductivity and synergistic effect between the chemical species present on their surface and the loaded NPs, carbon-based supports enable maximizing the efficient utilization of the catalysts toward drastic enhancement in both activity and durability. We also examined different judicious combinations of (electro)analytical techniques for the unambiguous determination of the reaction product(s) over the Au-based nanocatalysts, using glucose as model molecule given its importance in electrocatalysis. The performances of carbonsupported AuNPs as anode materials in direct glucose fuel cell in alkaline medium were also discussed.

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Section: Support Effect: Performances Of Carbon Supported Gold Nanopamentioning

confidence: 90%

Section: Synthesis Of Gold Nanoparticles Supported On Carbon Substratesmentioning

confidence: 99%

Section: Synthesis Of Gold Nanoparticles Supported On Carbon Substratesmentioning

confidence: 99%

Section: Synthesis Of Gold Nanoparticles Supported On Carbon Substratesmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical Reactivity at Free and Supported Gold Nanocatalysts Surface

Hebié¹,

Holade²,

Servat³

et al. 2016

Catalytic Application of Nano-Gold Catalysts

View full text Add to dashboard Cite

show abstract

“…[5][6][7] In general, the chemical synthesis route is more developed than the electrochemical one, as it allows better control of the final type of NPs. 5,8,9 However, a number of studies have shown that it is also possible to control Au NPs morphology using electrochemistry, [10][11][12][13][14][15][16] although a lot of them use a gold sacrificial anode like source of gold ions. [13][14][15] Electrochemical synthesis offers important advantages such as the production of NPs with high purity.…”

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemical synthesis of gold nanoparticles using cyclic voltammetry in the presence of a protective agent

et al. 2014

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Modification of electrodes with metal nanoparticles (NPs) is attracting intense interest because the widespread applications of these electrodes as sensors in electroanalysis. In the present study, we have analysed the electrodeposition of gold nanoparticles (Au NPs) on a platinum electrode in presence of polyvinylpyrrolidone using UV/Vis spectroelectrochemistry, which allows us to obtain in-situ evidences on the kind of nanoparticles deposited on the electrode. Under the selected experimental conditions, it has been possible to understand the reaction pathway for the synthesis of Au NPs in a voltammetry experiment. We establish that generation of NPs of a specific size is dramatically favoured during the different oxidation and reduction processes. Experiments with and without protective agent revealed that NPs generation is favoured since the first cycle when a protective agent is present in solution. IntroductionSynthesis of noble-metal nanoparticles (NPs) has received significant attention in recent years. [1][2][3][4] The ability to generate NPs with controlled size and shape is very important to advance in many areas of science and technology. In fact, scientists are beginning to understand the complex physics that leads to the generation of NPs with controlled size and shape. [5][6][7] In general, the chemical synthesis route is more developed than the electrochemical one, as it allows better control of the final type of NPs. 5,8,9 However, a number of studies have shown that it is also possible to control Au NPs morphology using electrochemistry, 10-16 although a lot of them use a gold sacrificial anode like source of gold ions.13-15 Electrochemical synthesis offers important advantages such as the production of NPs with high purity. 3 With chemical synthesis is possible to obtain well-defined NPs controlling the ratio between the reductive agent, gold precursor and protective agent. 5,8,9 On the other hand, electrochemical synthesis is very interesting to understand the mechanism of NPs generation because it is possible to control easily the potential at which the reaction takes place.In the case of the electrochemical synthesis, the reaction mechanism can be better understood when in-situ characterization techniques are coupled to electrochemistry to provide more information about the process that is taking place. [17][18][19][20][21] Here electrochemistry is combined with UV/Vis absorption spectroscopy to follow the formation of Au NPs. UV/Vis spectroelectrochemistry provides mechanistic information on Au NPs synthesis because the electrochemical process can be easily followed by observing gold characteristic plasmon band. 2,22 Recently, we have demonstrated that a multipulse technique yields monodisperse spherical Au NPs. 19This method was based on the application of several consecutive oxidation/reduction steps. In order to understand better the electrochemical process, here we have developed a new synthesis route based on cyclic voltammetry, where reduction and oxidation potentials are alternated d...

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