Unscrambling illusionary catalysis in three-dimensional particle-modified electrodes: Reversible reactions at conducting particles

2020 ◽  
Vol 18 ◽  
pp. 100514 ◽  
Author(s):  
Enno Kätelhön ◽  
Richard G. Compton
Keyword(s):  
Three Dimensional ◽  
Modified Electrodes ◽  
Reversible Reactions

Gold nanoparticle-doped three-dimensional reduced graphene hydrogel modified electrodes for amperometric determination of indole-3-acetic acid and salicylic acid

Nanoscale ◽  
2019 ◽  
Vol 11 (21) ◽  
pp. 10247-10256 ◽  
Author(s):  
Xiaodong Cao ◽  
Xueting Zhu ◽  
Shudong He ◽  
Xuan Xu ◽  
Yongkang Ye ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Salicylic Acid ◽  
Gold Nanoparticle ◽  
Three Dimensional ◽  
Modified Electrodes ◽  
Amperometric Determination ◽  
Reduced Graphene ◽  
Indole 3 Acetic Acid

Three-dimensional (3D) networked nanomaterials have attracted great interest because of their unique porous and 3D-networked structures.

scholarly journals Applications of Dendrimers in Drug Delivery Agents, Diagnosis, Therapy, and Detection

2014 ◽  
Vol 2014 ◽  
pp. 1-19 ◽  
Author(s):  
B. Noriega-Luna ◽  
Luis A. Godínez ◽  
Francisco J. Rodríguez ◽  
A. Rodríguez ◽  
G. Zaldívar-Lelo de Larrea ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Three Dimensional ◽  
Modified Electrodes ◽  
Biologically Active ◽  
Protein Mimics ◽  
Chemically Modified ◽  
Biological Compatibility ◽  
Variable Chemical ◽  
Diagnostic Applications ◽  
Diagnosis Therapy

In recent years, the application of dendrimers in biomedicine attracted much attention from scientists. Dendrimers are interesting for biomedical applications because of their characteristics, including: a hyperbranching, well-defined globular structures, excellent structural uniformity, multivalency, variable chemical composition, and high biological compatibility. In particular, the three-dimensional architecture of dendrimers can incorporate a variety of biologically active agents to form biologically active conjugates. This review of dendrimers focuses on their use as protein mimics, drug delivery agents, anticancer and antiviral therapeutics, and in biomedical diagnostic applications such as chemically modified electrodes.

scholarly journals Electrochemiluminescence Sensor Based on Electrospun Three-Dimensional Carbon Nanofibers for the Detection of Difenidol Hydrochloride

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3315 ◽  
Author(s):  
Hao Cheng ◽  
Zhengyuan Zhou ◽  
Yanqing Li ◽  
Wenyi Huang ◽  
Jun Feng ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Photoelectron Spectroscopy ◽  
Hydrofluoric Acid ◽  
Three Dimensional ◽  
Modified Electrodes ◽  
Good Recovery ◽  
X Ray ◽  
Peak Intensity ◽  
Poisoning In Children ◽  
Application Prospects

The detection of difenidol hydrochloride, which is a drug that is widely used for treating the nausea and vomiting symptoms caused by certain diseases, has been increasingly involved in cases of suicide via overdosing and of drug poisoning in children. A novel electrochemiluminescence (ECL) sensor for the simple and effective detection of difenidol hydrochloride was fabricated by modifying a glassy carbon electrode with three-dimensional carbon nanofibers (3D-CNFs). The 3D-CNFs were synthesized by electrospinning a mixture of montmorillonite (MMT) and polyacrylonitrile, carbonizing the electrospun product, and etching it with hydrofluoric acid. The form and structure of the 3D-CNFs was analyzed via scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman microspectroscopy. According to the experimental results obtained using the modified electrodes, a good linear relationship was found between peak intensity and difenidol concentration (y = 868.14x − 61.04, R2 = 0.999), with a relatively low detection limit (8.64 × 10−10 mol·L−1 (S/N = 3)). In addition, our approach exhibited good recovery values ranging from 98.99% to 102.28%. The proposed novel ECL sensor has wide application prospects for the detection of difenidol hydrochloride.

Integrative Chemistry-Based Generation of Novel Three Dimensional Macrocellular Carbonaceous Biofuel Cell

2014 ◽  
Vol 1641 ◽  
Author(s):  
Victoria Flexer ◽  
Nicolas Brun ◽  
Mathieu Destribats ◽  
Rénal Backov ◽  
Nicolas Mano
Keyword(s):  
Current Density ◽  
Electrode Material ◽  
Three Dimensional ◽  
Modified Electrodes ◽  
Biofuel Cell ◽  
High Current ◽  
Active Components ◽  
Synthetic Pathway ◽  
Current Densities ◽  
The Right

ABSTRACTHere we report the first membrane-less biofuel cell made by using three-dimensional carbonaceous foam electrodes. We first developed a new synthetic pathway to produce a new carbonaceous foam electrode material with increased porosity both in the meso and macroporous scale. We proved that by increasing the porosity of our three-dimensional foams we could increase the current density of our modified electrodes. Then, by choosing the right combination of enzyme and mediator, and the right loading of active components, we achieved unprecedentedly high current densities for an anodic system. Finally, we combined the improved cathode and anode to build a new membrane-less hybrid enzymatic biofuel cell consisting of a mediated anode and a mediator-less cathode.

scholarly journals Manganese Molybdenum Oxide Micro Rods Adorned Porous Carbon Hybrid Electrocatalyst for Electrochemical Determination of Furazolidone in Environmental Fluids

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1397
Author(s):  
Sivakumar Musuvadhi Babulal ◽  
Tse-Wei Chen ◽  
Shen-Ming Chen ◽  
Wedad A. Al-Onazi ◽  
Amal M. Al-Mohaimeed
Keyword(s):  
Molybdenum Oxide ◽  
Electrochemical Behavior ◽  
Porous Carbon ◽  
Electrochemical Impedance ◽  
Three Dimensional ◽  
Modified Electrodes ◽  
Electrochemical Determination ◽  
Modified Glassy Carbon Electrode ◽  
Ultra Trace

The frequent occurrence of furazolidone (FZD) in environmental fluids reveals the ongoing increase in use and raises concerns about the need of monitoring it. To investigate the electrochemical behavior of FZD, a novel sensor of manganese molybdenum oxide (MMO) micro rods adorned three-dimensional porous carbon (PC) electrocatalyst was constructed. The crystalline structure and surface morphology of the MMO/PC composite was characterized by XRD, Raman, FESEM, and HR-TEM. Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and amperometric(i-t) methods were used to assess the electrocatalytic activity of modified electrodes. In the presence of FZD, the as-fabricated MMO/PC modified glassy carbon electrode (GCE) performed better at lower potentials with a greater peak current than other modified GCE. These results emanate from the synergistic effect of the MMO/PC suspension on the GCE. The electrochemical behavior of the amperometric(i-t) technique was used to determine FZD. Amperometric(i-t) detection yielded linear dynamic ranges of 150 nM to 41.05 µM and 41.05 to 471.05 µM with detection limits of 30 nM. The MMO/PC hybrid sensor was also effectively used to detect FZD in environmental fluids, yielding ultra-trace level detection.

scholarly journals Эволюция массотранспортных свойств структурно-модифицированных электродов для топливных элементов и электролизеров воды

2021 ◽  
Vol 91 (11) ◽  
pp. 1689
Author(s):  
Н.В. Глебова ◽  
А.О. Краснова ◽  
А.А. Нечитайлов
Keyword(s):  
Mass Transport ◽  
Transport Properties ◽  
Porous Electrode ◽  
Three Dimensional ◽  
Modified Electrodes ◽  
Proton Exchange ◽  
Composite Electrodes ◽  
Structural Elements ◽  
Platinum Surface ◽  
One Dimensional

The method of a disk electrode (stationary and rotating) was used to study the regularities of changes in the mass transport properties of composite electrodes containing platinum nanoparticles on carbon black, the addition of carbon material with various forms of structural elements (three-dimensional and pseudo-one-dimensional carbon nanotubes with different length-to-diameter ratios), and the proton-exchange polymer Nafion. The transport of molecular oxygen inside a porous electrode to the platinum surface is investigated. Mechanisms for changing the mass transport properties of structurally modified electrodes in the course of electrochemical action are proposed.

scholarly journals Multi-Substrate Biofuel Cell Utilizing Glucose, Fructose and Sucrose as the Anode Fuels

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1534 ◽  
Author(s):  
Michał Kizling ◽  
Maciej Dzwonek ◽  
Anna Nowak ◽  
Łukasz Tymecki ◽  
Krzysztof Stolarczyk ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Direct Electron Transfer ◽  
Glucose Dehydrogenase ◽  
Three Dimensional ◽  
Modified Electrodes ◽  
Biofuel Cell ◽  
Capacitive Properties ◽  
A Cell

A significant problem still exists with the low power output and durability of the bioelectrochemical fuel cells. We constructed a fuel cell with an enzymatic cascade at the anode for efficient energy conversion. The construction involved fabrication of the flow-through cell by three-dimensional printing. Gold nanoparticles with covalently bound naphthoquinone moieties deposited on cellulose/polypyrrole (CPPy) paper allowed us to significantly improve the catalysis rate, both at the anode and cathode of the fuel cell. The enzymatic cascade on the anode consisted of invertase, mutarotase, Flavine Adenine Dinucleotide (FAD)-dependent glucose dehydrogenase and fructose dehydrogenase. The multi-substrate anode utilized glucose, fructose, sucrose, or a combination of them, as the anode fuel and molecular oxygen were the oxidant at the laccase-based cathode. Laccase was adsorbed on the same type of naphthoquinone modified gold nanoparticles. Interestingly, the naphthoquinone modified gold nanoparticles acted as the enzyme orienting units and not as mediators since the catalyzed oxygen reduction occurred at the potential where direct electron transfer takes place. Thanks to the good catalytic and capacitive properties of the modified electrodes, the power density of the sucrose/oxygen enzymatic fuel cells (EFC) reached 0.81 mW cm−2, which is beneficial for a cell composed of a single cathode and anode.

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