Electrochemical reduction of hydrogen peroxide by nanostructured hematite modified electrodes

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 67428-67434 ◽  
Author(s):  
Chia-Ting Chang ◽  
Chia-Yu Lin
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Reduction ◽  
Modified Electrodes

Structure-dependent selectivity of an α-Fe2O3|FePO4 based electrochemical H2O2 sensor against dissolved O2 is reported.

scholarly journals The mechanism of electrochemical reduction of hydrogen peroxide on silver nanoparticles

2018 ◽  
Vol 20 (3) ◽  
pp. 1608-1614 ◽  
Author(s):  
Xiaosheng Cai ◽  
Eden E. L. Tanner ◽  
Chuhong Lin ◽  
Kamonwad Ngamchuea ◽  
John S. Foord ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Electrochemical Reduction ◽  
Silver Nanoparticle ◽  
Modified Electrodes ◽  
Neutral Solution ◽  
Solution Proceeds

Reduction of hydrogen peroxide on silver nanoparticle modified electrodes in the neutral solution proceeds through a CE mechanism.

scholarly journals RuIII(edta) complexes as molecular redox catalysts in chemical and electrochemical reduction of dioxygen and hydrogen peroxide: inner-sphere versus outer-sphere mechanism

RSC Advances ◽  
2021 ◽  
Vol 11 (35) ◽  
pp. 21359-21366
Author(s):  
Debabrata Chatterjee ◽  
Marta Chrzanowska ◽  
Anna Katafias ◽  
Maria Oszajca ◽  
Rudi van Eldik
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Transfer ◽  
Electrochemical Reduction ◽  
Molecular Oxygen ◽  
Outer Sphere ◽  
Transfer Processes ◽  
Edta Complexes ◽  
Inner Sphere ◽  
Electron Transfer Processes ◽  
Sphere Mechanism

[RuII(edta)(L)]2–, where edta4– =ethylenediaminetetraacetate; L = pyrazine (pz) and H2O, can reduce molecular oxygen sequentially to hydrogen peroxide and further to water by involving both outer-sphere and inner-sphere electron transfer processes.

The electrocatalytic response of metallophthalocyanines when clicked to electrodes and to nanomaterials

2021 ◽  
Author(s):  
◽  
Lekhetho Simon Mpeta
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Zinc Oxide ◽  
Photoelectron Spectroscopy ◽  
Electrocatalytic Activity ◽  
Electrochemical Impedance ◽  
Modified Electrodes ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Electrochemical Microscopy

Conjugates of nanomaterials and metallophthalocyanines (MPcs) have been prepared and their electrocatalytic activity studied. The prepared nanomaterials are zinc oxide and silver nanoparticles, reduced graphene oxide nanosheets and semiconductor quantum dots. The MPcs used in this work are cobalt (II) (1a), manganese(III) (1b) and iron (II) (1c) 2,9(10),16(17),23(24)- tetrakis 4-((4-ethynylbenzyl) oxy) phthalocyaninato, 2,9(10),16(17),23(24)- tetrakis(5-pentyn-oxy) cobalt (II) phthalocyaninato (2), 9(10),16(17),23(24)- tris-[4-tert-butylphenoxy)-2- (4-ethylbezyl-oxy) cobalt (II) phthalocyaninato (3), 9(10),16(17),23(24)- tris-[4-tertbutylphenoxy)-2-(pent-4yn-yloxy)] cobalt (II) phthalocyaninato (4), cobalt (II) (5a) and manganese (III) (5b) 2,9(10),16(17),23(24)- tetrakis [4-(4-(5-chloro-1H-benzo [d]imidazol-2-yl)phenoxy] phthalocyaninato and 9(10),16(17),23(24)- tris tert butyl phenoxy- 2- [4-(4-(5-chloro-1H-benzo[d]imidazole-2-yl)phenoxy] cobalt (II) phthalocyaninato (6). Some of these MPcs (1a, 3 and 4) were directly clicked on azide grafted electrode, while some (1b, 1c, 2, 5a and 5b) were clicked to azide functionalised nanomaterials and then drop-dried on the electrodes. One phthalocyanine (5b) was drop-dried on the electrode then silver nanoparticles were electrodeposited on it taking advantage of metal-N bond. Scanning electrochemical microscopy, voltammetry, chronoamperometry, electrochemical impedance spectroscopy are among electrochemical methods used to characterise modified electrodes. Transmission electron microscopy, X-ray photoelectron spectroscopy, Xray diffractometry, Raman spectroscopy and infrared spectroscopy were employed to study surface functionalities, morphology and topography of the nanomaterials and complexes. Electrocatalytic activity of the developed materials were studied towards oxidation of 2-mercaptoethanol, hydrazine and hydrogen peroxide while the reduction study was based on oxygen and hydrogen peroxide. In general, the conjugates displayed superior catalytic activity when compared to individual materials. Complex 2 alone and when conjugated to zinc oxide nanoparticles were studied for their nonlinear optical behaviour. And the same materials were explored for their hydrazine detection capability. The aim of this study was to develop sensitive, selective and affordable sensors for selected organic waste pollutants. Conjugates were found to achieve the aim of the study compared to when individual materials were employed.

Simultaneous growth of spherical, bipyramidal and wire-like gold nanostructures in solid and solution phases: SERS and electrocatalytic applications

CrystEngComm ◽  
2017 ◽  
Vol 19 (36) ◽  
pp. 5369-5380 ◽  
Author(s):  
N. S. K. Gowthaman ◽  
S. Abraham John
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Reduction ◽  
Gold Nanostructures ◽  
Anisotropic Growth ◽  
Growth Solution ◽  
Simultaneous Growth

Anisotropic growth of Au nanostructures including bipyramidal and nanowires on ITO substrate was achieved by in situ electrochemical reduction of Au+ ions from the growth solution. The AuNS grown ITO substrates were utilized for SERS and electrochemical reduction of hydrogen peroxide.

scholarly journals Facile Fabrication of Metal Oxide Based Catalytic Electrodes by AC Plasma Deposition and Electrochemical Detection of Hydrogen Peroxide

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 888 ◽  
Author(s):  
Quang-Tan Bui ◽  
In-Keun Yu ◽  
Anantha Iyengar Gopalan ◽  
Gopalan Saianand ◽  
Woonjung Kim ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Metal Oxide ◽  
Photoelectron Spectroscopy ◽  
Electrode Materials ◽  
Plasma Deposition ◽  
Metal Oxide Nanoparticles ◽  
Modified Electrodes ◽  
Precursor Solution ◽  
X Ray ◽  
Cuo Nps

In this study, the fabrication of a metal oxide nanoparticles (NPs) dispersed catalytic electrode is described based on a new alternating current (AC) plasma deposition approach. The fabrication involves the treatment of AC plasma on a precursor solution comprised of metal salts such as CuCl2, FeCl2, and ZnCl2, and a monomer (acrylic acid) in the presence/absence of a cross-linker. Furthermore, the utility of such developed electrodes has been demonstrated for the electrochemical determination of hydrogen peroxide (H2O2). The electrode materials obtained through plasma treatment was characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM), contact angle measurements, energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry. Among the metal oxide modified electrodes prepared by the AC plasma deposition method, the copper oxide (CuO) NPs catalytic electrode exhibited significant oxidation and reduction peaks for H2O2 in phosphate-buffered saline solution. The catalytic electrode with CuO NPs exhibited a combination of good H2O2 sensing characteristics such as good sensitivity (63.52 mA M−1 cm−2), good selectivity, low detection limits (0.6 µM), fast sensing response (5 s), a wide linear range (0.5–8.5 mM), and good stability over 120 cycles. Based on our results, it is well demonstrated that plasma deposition could be effectively utilized for the fabrication of the catalytic electrode for detection of H2O2 concentrations. Further, the strategy of using AC plasma for fabrication of metal oxide-based modified electrodes could also be extended for the fabrication of other kinds of nanomaterials-based sensors.

ANCHOR OF Ni2+ ON THE AGMATINE SULFATE-MODIFIED ELECTRODES FOR THE DETERMINATION OF H2O2 IN FOOD

2016 ◽  
Vol 24 (01) ◽  
pp. 1750008
Author(s):  
YUHUA YAN ◽  
ZHONGHUI ZHANG ◽  
MINGSHU XIAO ◽  
HUALAN ZHOU
Keyword(s):  
Hydrogen Peroxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Thin Sheet ◽  
Modified Electrodes ◽  
Standard Addition ◽  
Carbon Electrode ◽  
Addition Method ◽  
Nickel Ion

A method was developed to conveniently and rapidly determine hydrogen peroxide (H2O2) in food. The glassy carbon electrode (GCE) modified with agmatine sulfate (AS) easily anchoring nickel ion was attached to AS with polyamine structure. As a result, more Ni[Formula: see text] was obtained and transformed to Ni(OH)2/NiOOH on the AS–GCE, which caused the electrode to own much better electrocatalytic performance on H2O2. Based on these, the content of H2O2 in thin sheet of bean curd sample was detected with standard addition method, by which good results were obtained.

The electrochemical reduction of hydrogen peroxide on polycrystalline copper in borax buffer

1994 ◽  
Vol 374 (1-2) ◽  
pp. 179-187 ◽  
Author(s):  
M.V. Vazquez ◽  
S.R. de Sanchez ◽  
E.J. Calvo ◽  
D.J. Schiffrin
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Reduction ◽  
Polycrystalline Copper
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