Electrochemistry

ABSTRACT Current response of ascorbic acid-stabilized copper (Cu) single nanoparticles (NPs) collision on gold (Au) ultramicroelectrode (UME) surface was observed by the electrocatalytic amplification method. When the applied potential to the UME was 0.4 V, blip (or spike) response of current, which is responsible for the self-oxidation of Cu NP, was obtained. When the applied potential was over 0.5 V, the blip response combined with staircase response was obtained. The blip part indicates the…

High temperature proton exchange membrane fuel cells (HT-PEMFCs) are a promising clean technology, especially for automobile applications.1 These devices generate electricity from the chemical reactions that occur in the anode side of the cell, using H2 as a fuel and generating heat and water as by-products.2, 3 However, experimental studies using HT-PEMFCs show that degradation of the cell can occur after certain hours of operation (around 500 hours).4 Some of the factors that contribute to the…

Observation & Calculations for Nanorefrigerant Graph of C.O.P. vs. Nanoparticle Concentration for Nanorefrigerant. C.O.P RESULTS WHEN NANOPARTICLE MIXED IN R134A & POE OIL Figure 5.1. Graph of nanorefrigerant C.O.P vs. nanolubricant C.O.P. 5.2. GRAPH OF PERCENTAGE CHANGE IN THE COP OF THE SYSTEM Figure5.2. Graph of percentage C.O.P of nanorefrigerantvs. nanolubricant. Here the result shows the percentage change in the C.O.P when the air conditioning test rig run on the nanorefrigerant and…

Abstract: We describe the successful synthesis of Polypyrrole-Gold nanocomposites (PPy-Au NCs) by the chemical oxidative polymerization of pyrrole with ferric chloride as an oxidizing agent, in the presence of a colloidal suspension of gold nanoparticles. Gold nanoparticles (Au NPs) were synthesized by standard citrate reduction method. Au NPs and PPy-Au NCs were characterized by Transmission Electron Microscopy (TEM), Atomic Forced Microscopy (AFM), Scanning Electron Microscopy (SEM), Fourier…

Electrochemical Performance. To evaluate the electrochemical behaviors of the highly open framework of the as synthesized LTH on nickel foam electrodes NCA-L-@NF, NCA-L@G-NF and NCA-L@ BG-NF with three different feeding mole ratios , which is the best morphological foundation for fast redox reaction and charge accumulation, its potential application in high-performance supercapacitor has been investigated by cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance…

The carbon supported PtFeS catalysts were prepared by a modified polyol method. In brief, 0.3 g carbon (Ketjen-black heat-treated at 2250 °C, SE = 160 m2 g-1) was dispersed in 135 g ethylene glycol. 5.993 g of 8 wt% H2PtCl6 (Umicore; Pt content, 39.8 wt%), 1.874 g of 8 wt% FeCl3. 6H2O (Sigma-Aldrich), and 0.352 g of 8 wt% (NH2)2SC (Sigma-Aldrich) previously mixed in ethylene glycol were added to the dispersion. The pH of the stirred reaction mixture was adjusted to ∼11 using 1 M NaOH dissolved…

A catalyst layer is usually the slimmest layer in a PEM fuel cell; however this is an extremely complex component because of its porosity, several phases, and reactions (Spiegel 2008). An efficient catalyst layer should provide several functions at the same time; transporting the electron and the proton, supplying oxygen and hydrogen and water management. The structure and composition of the catalyst layer affects all these roles. Optimization of the catalyst layer can provide for all these…

Purpose: By doing this experiment, students will properly complete a redox titration well also determining the amount of hypochlorite ions present in the commercial bleach given. Introduction: Commercial Bleach and other commercial products like hair colouring agents, contain oxidizing agents. Oxidizing agents are substances that remove electrons from one or more reactants and thereby oxidizes it, whereas reducing agents are substance that give electrons to other reactant. There is some…

A Battery (Electricity) is a device that makes electric current through motion of cells which are the components of the battery. They are devices that convert their inner chemical energy into electrical energy. A battery has of two or more cells which are connected together in order to give out electricity. Batteries are commonly used in single cells such as the ones used to power radios, watches and small electrical appliances that are used in everyday life. They are also used to supply energy…

Gold electrodes were prepared after cleaning with H2SO4 and H2O2. Glucose oxidase and laccase were immobilized on the GO/Co/chitosan modified electrodes in a sodium phosphate buffer solution (0.1 M, Ph 7) for 8 h [12]. The electrochemical activities of enzymatic electrodes were measured using VersaSTAT3 (AMETEK, Princeton Applied Research, USA). Electrochemical measurements such as CV and EIS were carried out using an Au electrode with the assembled glucose oxidase, Ag/AgCl, and a Pt wire as the…