Promoted effect of PANI as electron transfer promoter on CO oxidation over Au/TiO2

Yang, Kai; Huang, Kun; He, Zhoujun; Chen, Xun; Fu, Xianzhi; Dai, Wenxin

doi:10.1016/j.apcatb.2014.04.028

Cited by 33 publications

(19 citation statements)

References 48 publications

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“…As for preferential oxidation of CO (PROX), which is of significant importance in both research and industrial application, several fundamental insights into the catalytic mechanism over supported metal catalysts have also been gained, such as the size and structure effects [8,9], support effects [10][11][12][13], interfacial effects [14], influence of water [15,16], identification of active sites [17][18][19] and intermediates [20][21][22], and discussion of reaction pathways [23][24][25][26]. Nowadays, it is well known that the oxidation of CO follows the Langmuir-Hinshelwood mechanism, and particular attention should be paid to the activation of O 2 , which will be inhibited by the strong adsorption of CO on the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

Construction of ultrafine and stable PtFe nano-alloy with ultra-low Pt loading for complete removal of CO in PROX at room temperature

Zhang

Liu

Zhang

et al. 2016

Applied Catalysis B: Environmental

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Section: Introductionmentioning

confidence: 99%

Construction of ultrafine and stable PtFe nano-alloy with ultra-low Pt loading for complete removal of CO in PROX at room temperature

Zhang

Liu

Zhang

et al. 2016

Applied Catalysis B: Environmental

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“…4B, the Au 4f7/2 and Au 4f5/2 peaks at 84.2 and 87.9 eV, respectively, for the Poly(EDOT-MeSH)/Au hollow spheres indicate the presence of Au 0 . 58,59 Generally, the binding energies of the bulk Au 4f levels appear at (4f 7/2 ) 83.8 and (4f 5/2 ) 87.6 eV. 60,61 In our case, the Au 4f 7/2 and Au 4f 5/2 binding energies were slightly higher than the bulk Au 4f levels, which suggested that the Au atoms bond with the S atom in Poly(EDOT-MeSH).…”

Section: Resultsmentioning

confidence: 78%

Hollow, Spherical, Poly(3,4-ethylenedioxythiophene)-Bearing Methanethiol as a Gold Stabilizer for High-Efficiency Electrochemical Sensors

Ali¹,

Abdiryim²,

Huang³

et al. 2018

J. Electrochem. Soc.

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Conducting polymers decorated with noble metals are good electrochemical sensors for biological species. In this work, we developed a polymer of methanethiol-grafted poly(3,4-ethylenedioxythiophene) hollow spheres (Poly(EDOT-MeSH)) using SiO 2 nanospheres as a hard template. The Poly(EDOT-MeSH) spheres were used as both a reductant and stabilizer to decorate gold nanoparticles (Au NPs). FTIR, XRD, EDX, SEM and TEM analyses were used to characterize the Poly(EDOT-MeSH)/Au hollow spheres. The chemical bond between S and Au was confirmed by XPS. The electrochemical performance of the Poly(EDOT-MeSH)/Au hollow spheres was determined by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results revealed that the Poly(EDOT-MeSH)/Au hollow sphere-based electrochemical sensor possesses an excellent conductivity and high redox reversibility with detection limits (S/N = 3) of 5.3, 0.04 and 0.12 μM in the linear ranges of 50-320 μM, 0.05 μM − 780 μM and 0.8 μM − 250 μM for the determination of AA, DA and UA, respectively. These results will further the development of this type of electrochemical sensor for biological species. Small biological species usually coexist in physiological fluids, which are very important for maintaining the functions of organisms.1,2 As typical biological species, dopamine (DA), uric acid (UA) and ascorbic acid (AA) are important components of the neural system and play significant roles in physiological functions.3,4 DA is a natural neurotransmitter that plays an important role in controlling the central nervous system and coordinating normal cardiovascular, renal, and hormonal functions. 5,6 The UA concentration in blood and urine is usually related to diseases such as Lesch-Nyhan syndrome, hyperuricemia, gout and kidney stones. 7,8 Therefore, the ability to detect and quantify these biological species is very important. Several analytical techniques, such as liquid chromatography, 9 ultraviolet visible spectroscopy, 10 capillary electrophoresis, 11,12 chemiluminescence 13,14 and spectrometry 15 have been used to detect single or multiple biological species. However, most of these techniques require specialized, expensive instruments and can be utilized only for individual determination. In the last few years, electrochemical techniques have attracted attention for the determination of multiple components due to their simplicity, low cost, minimal analysis time, high sensitivity, good selectivity and simple instrumentation. [16][17][18] However, the electrochemical oxidation of DA and UA is difficult to observe with conventional electrodes, such as glassy carbon, gold and platinum electrodes, because the oxidation products cause electrode surface fouling. 3,19 In addition, AA co-exists with DA and UA in most biological fluids, and the AA concentration is higher than that of DA and UA (100-1000 times higher than that of DA). 20 The AA oxidation peak often overlaps with the DA and UA peaks because their oxidation potentials on conventional electrodes are nearly equal. 21,22 To...

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“…In Figure , Au/PANI shows characteristic peaks at ca. 1500 and 1340 cm −1 , which assigned to the protonated C=N + stretching mode and the protonated C‐N + stretching of the delocalized polaronic charge carriers, respectively . The peak at about 1575 and 1495 cm −1 correspond to the C−C stretching vibration of the quinoid rings (−N=(C 6 H 4 )=N−) and benzenoid ring (−(C 6 H 4 )−), respectively.…”

Section: Resultsmentioning

confidence: 98%

“…The peak at about 1575 and 1495 cm −1 correspond to the C−C stretching vibration of the quinoid rings (−N=(C 6 H 4 )=N−) and benzenoid ring (−(C 6 H 4 )−), respectively. Besides, the peak at 1170 cm −1 can be attributed to the C−H in the −N=(C 6 H 4 )=N− and −(C 6 H 4 )− . The spectrum of Au/RGO exhibits two prominent peaks at ca.…”

Section: Resultsmentioning

confidence: 99%

Au Nanochains Anchored on 3D Polyaniline/Reduced Graphene Oxide Nanocomposites as a High‐Performance Catalyst for Ethanol Electrooxidation

Zhang

Shi

et al. 2017

ChemElectroChem

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A nanocomposite containing Au, polyaniline (PANI) and reduced graphene oxide (RGO) has been synthesized by a two‐step method. The PANI can intermix with graphene to build a three‐dimensional (3D) structure, which is beneficial for uniform dispersion of Au networks with a mean diameter of 5.6 nm. In addition to its role as the support of Au, the presence of PANI is also favorable for avoiding the heavy agglomeration of graphene when the reduction occurs. Additionally, the introduction of graphene can not only boost the connections with PANI, but also accelerate the electron transfer between the electrolyte solution and catalysts. Electrochemical tests indicate that the Au/PANI/RGO hybrid exhibits high catalytic activity and stability for ethanol electrooxidation in alkaline conditions. The superior performance can be ascribed to the uniform dispersion of the Au nanocatalyst on the PANI/RGO support with a particular 3D structure, resulting in an increase of the electrochemically active surface area together with a synergic effect between the PANI, graphene and Au.

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Promoted effect of PANI as electron transfer promoter on CO oxidation over Au/TiO2

Cited by 33 publications

References 48 publications

Construction of ultrafine and stable PtFe nano-alloy with ultra-low Pt loading for complete removal of CO in PROX at room temperature

Construction of ultrafine and stable PtFe nano-alloy with ultra-low Pt loading for complete removal of CO in PROX at room temperature

Hollow, Spherical, Poly(3,4-ethylenedioxythiophene)-Bearing Methanethiol as a Gold Stabilizer for High-Efficiency Electrochemical Sensors

Au Nanochains Anchored on 3D Polyaniline/Reduced Graphene Oxide Nanocomposites as a High‐Performance Catalyst for Ethanol Electrooxidation

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