Layer‐by‐Layer Gold–Ceramic Nanoparticulate Electrodes for Electrocatalysis

Celebańska, Anna; Opałło, Marcin

doi:10.1002/celc.201600288

Cited by 11 publications

(6 citation statements)

References 70 publications

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“…The oxidation of hydrazine onto AuNP‐modified electrodes showed a shift to more negative values of the peak potential and an increase in the current values. These results indicate that the AuNPs electrocatalyze the oxidation of hydrazine and it is in agreement with other electrodes modified with AuNPs . Good electrocatalytic properties of AuNP‐CT has been also observed for other positively charged analytes like ractopamine and metaproterenol , in which case the authors associated the results with the electrostatic attraction between the AuNP and the analyte.…”

Section: Resultssupporting

confidence: 82%

“…The cathodic peak close to 0.45 V in the reverse scan is related to the reduction of the gold oxides (Eq. 1) . This experiment is commonly used to confirm the electrodeposition or the attachment of AuNPs .

true {A u}^{0} + {3 H}_{2} O \leftrightarrow {A u}_{2} O_{3} + {6 H}^{+} + {6 e}^{-}

…”

Section: Resultsmentioning

confidence: 99%

“…Hydrazine ( pK a =8.23 ), is oxidized mainly through

{4 e}^{-} / {4 H}^{+}

process, with N 2 as the final product in aqueous solution . Also, it is highly dependent on the surface structure of the electrode, which affects the electrocatalysis of the reaction . In Figure B the DPVs were obtained in the presence of 1.0 mM hydrazine.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical Characterization and Electrocatalytic Application of Gold Nanoparticles Synthesized with Different Stabilizing Agents

et al. 2017

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Gold nanoparticles (AuNPs) have unique properties, making them attractive for electronic and energy‐conversion devices and as (electro)catalysts for electrochemical sensors. In addition to the size and shape of AuNPs, the electrocatalytic properties of AuNP‐sensors are also determined by the stabilizing agent used in their synthesis. Here, AuNPs were synthesized with citrate, alginate and quercetin, obtaining spherical and negatively charged nanoparticles. The AuNPs were used to modify glassy carbon electrodes (AuNPs/GCE), which were characterized by scanning electron microscopy and electrochemical techniques. The AuNPs/GCE showed aggregates of different sizes and degrees of dispersion on the electrode surface depending on the stabilizing agent. The AuNP's aggregates affect the homogeneity of the film, the reproducibility of the electrodes and their response in buffer solution. Finally, to evaluate the electrocatalytic ability of the AuNPs/GCE, we studied the oxidation of two analytes with opposite charges: (1) sunset yellow (negative) and (2) hydrazine (positive). Compared with GCE, the AuNPs/GCE showed good electrocatalytic properties for hydrazine, increasing the current up to 50 % and shifting the potential by almost 400 mV, depending on the AuNP used. For the negatively charged analyte, the current decreased up to 50 % and no shift in potential was observed. Thus, the electrocatalytic properties of the AuNPs showed to be highly dependent on the nature of the analyte.

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Section: Resultssupporting

confidence: 82%

true {A u}^{0} + {3 H}_{2} O \leftrightarrow {A u}_{2} O_{3} + {6 H}^{+} + {6 e}^{-}

…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Characterization and Electrocatalytic Application of Gold Nanoparticles Synthesized with Different Stabilizing Agents

et al. 2017

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“…This modified electrode also included laccase thereby comprising a biosensor in which its high porosity led to increased sensitivity was additional layer numbers. Opallo and coworkers also used LbL assembly to fabricate a biosensor based on immobilized bilirubin oxidase [62] and to incorporate gold nanoparticles on electrodes used for determinations of nitrite, sulfite, and hydrazine [63]. Overall, the LbL method involving particulate silica is potentially suited to a wide range of applications in that it comprises a highly porous spacer in these assemblies.…”

Section: Electrodes Based On Sol-gel Compositesmentioning

confidence: 99%

Electroanalysis based on stand-alone matrices and electrode-modifying films with silica sol-gel frameworks: a review

Miecznikowski

Cox

2020

J Solid State Electrochem

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Silica sol-gel matrices and its organically modified analogues that contain aqueous electrolytes, ionic liquids, or other ionic conductors constitute stand-alone solid-state electrochemical cells when hosting electrodes or serve as modifying films on working electrodes in conventional cells. These materials facilitate a wide variety of analytical applications and are employed in various designs of power sources. In this review, analytical applications are the focus. Solid-state cells that serve as gas sensors, including in chromatographic detectors of gas-phase analytes, are described. Sol-gel films that modify working electrodes to perform functions such as hosting electrochemical catalysts and acting as size-exclusion moieties that protect the electrode from passivation by adsorption of macromolecules are discussed with emphasis on pore size, structure, and orientation. Silica sol-gel chemistry has been studied extensively; thus, factors that control its general properties as frameworks for solid-state cells and for thin films on the working electrode are well characterized. Here, recent advances such as the use of dendrimers and of nanoscale beads in conjunction with electrochemically assisted deposition of silica to template pore size and distribution are emphasized. Related topics include replacing aqueous solutions as the internal electrolyte with room-temperature ionic liquids, using the sol-gel as an anchor for functional groups and modifying electrodes with silica-based composites.

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“…[6] Meanwhile, the use of liquid fuel is also beneficial to the construction of more compact and portable power sources. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] Among those, noble metals such as Au, [10,11] Pd, [12,13] Pt [14,15] and Ag [16,17] exhibit relatively better catalytic properties and slower self-decomposition rates. [9] According to hydrazine electro-oxidation reaction, plenty of materials have been designed and fabricated for higher catalytic activity and stability.…”

Section: Introductionmentioning

confidence: 99%

CuPd Alloy Oxide Nanobelts as Electrocatalyst Towards Hydrazine Oxidation

2019

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Among non-precious metal catalysts for the hydrazine oxidation reaction, Cu-based catalysts have exhibited relatively high performance ascribed to their lower onset potential and better stability. However, the catalytic properties, including activity and durability, still need further improvement in contrast to noble metal catalysts such as Pt and Pd. In this study, Pd was used as the promotor between Cu and Pd towards the hydrazine oxidation reaction. The CuPd alloy oxide ((Cu 0.9 Pd 0.1 ) O) nanobelts were fabricated by using a dealloying method. The electrochemical measurements show that (Cu 0.9 Pd 0.1 )O nanobelts exhibit 1.5 times higher current density, and better stability than CuO towards the hydrazine electro-oxidation reaction. These improvements are further evidenced in the direct hydrazine-hydrogen peroxide fuel cell by using these two catalysts as the anodes in comparison. A single fuel cell using (Cu 0.9 Pd 0.1 )O as the anode exhibits a peak power density of 330 mW cm À 2 , about 100 mW cm À 2 higher than that of pure CuO. N 2 sorption experiments and product analysis demonstrate that alloying with Pd not only could enlarge the surface area of (Cu 0.9 Pd 0.1 )O but also could suppress the self-decomposition of hydrazine. These improvements will consequently increase the catalytic activity and fuel efficiency of (Cu 0.9 Pd 0.1 )O.

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Layer‐by‐Layer Gold–Ceramic Nanoparticulate Electrodes for Electrocatalysis

Cited by 11 publications

References 70 publications

Electrochemical Characterization and Electrocatalytic Application of Gold Nanoparticles Synthesized with Different Stabilizing Agents

Electrochemical Characterization and Electrocatalytic Application of Gold Nanoparticles Synthesized with Different Stabilizing Agents

Electroanalysis based on stand-alone matrices and electrode-modifying films with silica sol-gel frameworks: a review

CuPd Alloy Oxide Nanobelts as Electrocatalyst Towards Hydrazine Oxidation

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