Autocatalytic mechanism of H2O2 reduction on Ag electrodes in acidic electrolyte: experiments and simulations

Flätgen, Georg; Wasle, Sabine; Lübke, M.; Eickes, Christian; Radhakrishnan, Ganesan; Doblhofer, Karl; Ertl, G.

doi:10.1016/s0013-4686(99)00184-x

Cited by 129 publications

(77 citation statements)

References 24 publications

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“…The detection limit of 3 × 10 -4 M (Fig. 9B) is lower than those obtained with the reported peroxidase -based H 2 O 2 sensors 24 and silver nanoparticle -GCE. This wider linear range and higher sensitivity depicted by the Ag/SBA-15/TEPA film on the electrode surface and its respective electrocatalytic activity might be due to the dispersion as well as the stabilization of SBA-15/TEPA.…”

Section: Resultsmentioning

confidence: 53%

“…Up to now, humpty numbers of methods are reported for electrocatalytic reduction of H 2 O 2, for instance, spectrometry, 18 fluorimetry 19 and electrochemistry. 20 Particularly, noble metals, including Pt, 21 Pd, 22 Au, 23 Ag 24 and a combination of them, electro catalytically reduce H 2 O 2 both in acidic and basic medium. The previous report on metal immobilized amine grafted mesoporous silica for the detection of H 2 O 2 25 provoked us to use other amines for metal immobilization and/or stabilization for H 2 O 2 reduction.…”

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic Reduction of Hydrogen Peroxide on Silver Nanoparticles Stabilized by Amine Grafted Mesoporous SBA-15

Vinoba¹,

Jeong²,

Bhagiyalakshmi³

et al. 2010

Bulletin of the Korean Chemical Society

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Mesoporous SBA-15 was synthesized using tetraethylorthosilicate (TEOS) as the silica source and Pluronic (P123) as the structure-directing agent. The defective Si-OH groups present in SBA-15 were successively grafted with 3-chloropropyltrimethoxysilane (CPTMS) followed by tris-(2-aminoethyl) amine (TAEA) and/or tetraethylenepentamine (TEPA) for effective immobilization of silver nanoparticles. Grafting of TAEA and/or TEPA amine and immobilization of silver nanoparticles inside the channels of SBA-15 was verified by XRD, TEM, IR and BET techniques. The silver nanoparticles immobilized on TAEA and /or TEPA grafted SBA-15 was subjected for electrocatalytic reduction of hydrogen peroxide (H2O2). The TEPA stabilized silver nanoparticles show higher efficiency for reduction of H2O2 than that of TAEA, due to higher number of secondary amine groups present in TEPA. The amperometric analysis indicated that both the Ag/SBA-15/TAEA and Ag/SBA-15/TEPA modified electrodes required lower over-potential and hence possess high sensitivity towards the detection of H2O2. The reduction peak currents were linearly related to hydrogen peroxide concentration in the range between 3 × 10 -4 M and 2.5 × 10 -3 M with correlation coefficient of 0.997 and detection limit was 3 × 10 -4 M.

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Section: Resultsmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Reduction of Hydrogen Peroxide on Silver Nanoparticles Stabilized by Amine Grafted Mesoporous SBA-15

Vinoba¹,

Jeong²,

Bhagiyalakshmi³

et al. 2010

Bulletin of the Korean Chemical Society

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“…As the OH ads adsorbate accelerates the reaction, 31 any species that further provides OH ads could actively participate in the H 2 O 2 reduction. In our case, although structural and electronic factors cannot be completely ruled out, it is reasonable to assume that the generation of OH ads on Co would facilitate hydrogen peroxide catalysis by further supplying oxygenated species and, hence, promote the reaction at lower potentials compared with those observed for the separated materials employed in this work.…”

Section: Catalytic Properties Of Ptco-lbl Film Towards H 2 Omentioning

confidence: 99%

Dendrimer–carbon nanotube layer-by-layer film as an efficient host matrix for electrogeneration of PtCo electrocatalysts

Gasparotto

Castelhano

Silva

et al. 2014

Phys. Chem. Chem. Phys.

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In this paper we demonstrate that layer-by-layer (LbL) films of polyamidoamine (PAMAM) dendrimers and single-walled carbon nanotubes (SWCNTs) are efficient for controlling the morphology of electrogenerated cobalt (Co) and the platinum-cobalt (PtCo) alloy. While Co grew to the micrometer scale and poorly covered the ITO substrate, with the LbL matrix it was kept in the nanoscale regime and provided full substrate coverage. Pt-decorated Co nanoparticles were then generated by applying a single potential pulse in a solution containing simultaneously Co and Pt ions. Segregation of Pt and Co deposits was observed in field emission gun (FEG) images, but the PtCo alloy was probably formed to some extent according to X-ray diffraction analysis. The PtCo-LbL hybrid exhibited superior catalytic activity toward H 2 O 2 reduction compared to the Pt-modified LbL film, which opens new prospects for applications in biosensing and fuel cells.

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“…However, the special requirements of temperature, concentration and pH to maintain enzyme stability and the difficulties in finding an appropriate method of immobilization of the enzyme on a solid surface as well as the saturation with the substrate, which affects linear calibration range, have led the industry to search for alternative non-enzymatic process to hydrogen peroxide determination [15,22]. Many metals such as Pt [23,24], Ag [25], Fe, Zn, Cu [26] and Pd [27] and metal alloys such as Pd/Au [28], Pd/Ir, and Au/Pt [13] have been employed as catalysts for hydrogen peroxide reactions.…”

Section: Introductionmentioning

confidence: 99%

Enhanced electrochemical reduction of hydrogen peroxide on silver paste electrodes modified with surfactant and salt

Gonzalez‐Macia¹,

Smyth²,

Morrin³

et al. 2011

Electrochimica Acta

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Autocatalytic mechanism of H2O2 reduction on Ag electrodes in acidic electrolyte: experiments and simulations

Cited by 129 publications

References 24 publications

Electrocatalytic Reduction of Hydrogen Peroxide on Silver Nanoparticles Stabilized by Amine Grafted Mesoporous SBA-15

Electrocatalytic Reduction of Hydrogen Peroxide on Silver Nanoparticles Stabilized by Amine Grafted Mesoporous SBA-15

Dendrimer–carbon nanotube layer-by-layer film as an efficient host matrix for electrogeneration of PtCo electrocatalysts

Enhanced electrochemical reduction of hydrogen peroxide on silver paste electrodes modified with surfactant and salt

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