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Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Unrenewable Cells00:50

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
Design Example: Automobile Ignition System01:14

Design Example: Automobile Ignition System

The automobile's ignition system plays a vital role by ensuring the timely ignition of the fuel-air mixture in each cylinder. This ignition is facilitated by a spark plug, which is composed of two electrodes separated by an air gap. A spark forms across this air gap when a substantial voltage is generated between the electrodes, leading to the ignition of the fuel.
One can generate a large voltage using a car battery of 12 volts with the help of inductors. Inductors are known for opposing rapid...
Microbial Fuel Cells01:23

Microbial Fuel Cells

Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...

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Construction and Testing of Coin Cells of Lithium Ion Batteries
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Construction and Testing of Coin Cells of Lithium Ion Batteries

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Ciencias de los Materiales: Nuevos Tigres en el Tanque de Célula de Combustible

R F Service

    Science (New York, N.Y.)
    |September 11, 2007
    PubMed
    Resumen

    Las pilas de combustible de óxido sólido (SOFC) que funcionan con combustibles fósiles se están acercando a la adopción generalizada. Los nuevos diseños de SOFC operan a temperaturas más bajas y ofrecen una generación de electricidad a gran escala altamente eficiente.

    Área de la Ciencia:

    • Conversión y almacenamiento de energía.
    • Ciencia de los materiales Ciencia de los materiales.
    • La electroquímica es electroquímica.

    Sus antecedentes:

    • Las pilas de combustible convencionales de óxido sólido (SOFC) requieren altas temperaturas y materiales caros.
    • Décadas de investigación han llevado a avances incrementales en la tecnología de pilas de combustible.
    • La generación de energía basada en combustibles fósiles sigue siendo una parte significativa de la combinación energética global.

    Objetivo del estudio:

    • Para resaltar los avances recientes en la tecnología de celdas de combustible de óxido sólido.
    • Mostrar nuevos diseños de SOFC que funcionan a temperaturas más bajas.
    • Demostrar el potencial de los SOFC para una generación de electricidad eficiente y a gran escala.

    Principales métodos:

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    • Desarrollo de nuevos materiales cerámicos para SOFCs.
    • Conversión directa de hidrocarburos en electricidad en las SOFC.
    • Demostración a nivel de sistema de la generación de energía SOFC.

    Principales resultados:

    • Una nueva generación de SOFC convierte los hidrocarburos directamente en electricidad a temperaturas reducidas.
    • Un sistema SOFC a gran escala demostró una eficiencia sin precedentes para la generación de electricidad.
    • La tecnología es prometedora para superar las limitaciones previas de los SOFC.

    Conclusiones:

    • Las pilas de combustible de óxido sólido que utilizan combustibles fósiles se están acercando a la aplicación práctica.
    • Los SOFC de baja temperatura representan un avance significativo en la tecnología energética.
    • Los sistemas SOFC ofrecen una solución altamente eficiente para la generación de energía a gran escala.