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Related Concept Videos

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

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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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MATERIALS SCIENCE: New Tigers in the Fuel Cell Tank.

R F Service

    Science (New York, N.Y.)
    |September 11, 2007
    PubMed
    Summary
    This summary is machine-generated.

    Solid oxide fuel cells (SOFCs) running on fossil fuels are nearing widespread adoption. New SOFC designs operate at lower temperatures and offer highly efficient large-scale electricity generation.

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    Area of Science:

    • Energy Conversion and Storage
    • Materials Science
    • Electrochemistry

    Background:

    • Conventional solid oxide fuel cells (SOFCs) require high temperatures and expensive materials.
    • Decades of research have led to incremental advances in fuel cell technology.
    • Fossil fuel-based power generation remains a significant part of the global energy mix.

    Purpose of the Study:

    • To highlight recent advancements in solid oxide fuel cell technology.
    • To showcase novel SOFC designs that operate at lower temperatures.
    • To demonstrate the potential of SOFCs for efficient, large-scale electricity generation.

    Main Methods:

    • Development of new ceramic materials for SOFCs.
    • Direct conversion of hydrocarbons to electricity in SOFCs.
    • System-level demonstration of SOFC power generation.

    Main Results:

    • A new generation of SOFCs converts hydrocarbons directly into electricity at reduced temperatures.
    • A large-scale SOFC system demonstrated unprecedented efficiency for electrical generation.
    • The technology shows promise for overcoming previous limitations of SOFCs.

    Conclusions:

    • Solid oxide fuel cells utilizing fossil fuels are approaching practical application.
    • Lower-temperature SOFCs represent a significant breakthrough in energy technology.
    • SOFC systems offer a highly efficient solution for large-scale power generation.