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For a demonstration in an educational setting, the Eco H2/O2 system available from Fuel Cell Store (see Supplier s Index) part no. 534407 offers a great way to demonstrate the principles in this chapter, in a nice, desk-mounted study of solar hydrogen electricity.
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Project 46: Stored Hydrogen to Create Electricity
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Figure 17-16 Circuit diagram.
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Figure 17-15 Water is produced.
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The hydrogen economy isn t something that is going to happen overnight. Furthermore, it won t be a single event where all of a sudden we switch from one to the other. Instead, hydrogen technologies will gradually begin to permeate our lives. This will probably start first of all with vehicles and portable electronic devices, as these devices will benefit from lightweight, high-density energy storage that hydrogen affords. We can expect to see hydrogen in more and more places. However, there are technological hurdles that must be overcome first of all.
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I like to think of fuel cells as a bit like a sandwich. If you can, imagine a cheese sandwich, with the two pieces of bread as the electrodes. Those pieces of bread are buttered. It is this butter that effects the interaction between the cheese and the bread the butter can be likened to the gas diffusion media.
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This website gives a particularly good animation that clearly illustrates what is happening inside a PEM fuel cell. www.humboldt.edu/~serc/animation.html
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18
Photosynthesis Fuel from the Sun
We can harness solar energy in a lot of different direct ways, as we have seen already in this book. We can use the sun to meet our requirements for heat and electricity. Sometimes, as we saw in 17, we need energy sources that are portable and lightweight for powering cars, for example, and for transporting energy to sites where it is not appropriate to use solar energy directly. One way in which we can harness solar energy, is to produce plants that we can turn into fuels. Remember, plants use the sun s energy to grow. A plant takes in carbon dioxide from the atmosphere, water, and nutrients from the soil, and turns it into biological matter. The trees and flowers would not exist without the sun s energy. We see in Figure 18-1 the cycle that takes place. Some plants can be turned into oils. Remember, each time you eat some French fries, they were cooked in oil which came from vegetable matter, often sunflower. This oil can be burned directly in engines. It is also possible to turn vegetable oils into a product called biodiesel. Biodiesel can be used in most ordinary diesel engines as if it were any other diesel fuel. The difference between the vegetable oil, which is a triglyceride, and the biodiesel, is that the biodiesel contains shorter hydrocarbon chains. This means, that among other properties, the oil is less viscous, which means that it flows more freely. Another way that we can produce biofuels is to produce sugar crops, which can be fermented and distilled to produce ethanol. This ethanol can be
Figure 18-1 Biofuel fuel from the sun.
Copyright 2007 by The McGraw-Hill Companies, Inc. Click here for terms of use.
used in gasoline/petrol engines with relatively little modification. Countries like Brazil often use a blend of ethanol derived from plant matter, and gasoline/petrol from conventional sources. This is sold as Gasohol in many places. By blending the gasoline/petrol with ethanol, they are reducing their country s dependence on imported oil. The U.S.A. and many countries of the developed world can learn a lot from these developing countries, as the developed world is now largely dependent on imported fuels from the Middle East. The oil that is available on home turf is now largely located in areas of outstanding natural beauty, places that are very sensitive to environmental change. U.S. oil companies are now having to cut pipelines through swathes of Alaska, causing enormous environmental damage. Surely there are other solutions solutions that can benefit U.S. farmers If we look at how ethanol (Figure 18-2) is produced, in Figure 18-3 we can see that the process is driven by solar energy. However, it is
important to note, that at other stages there are inputs of energy. These might not always come from renewable energy sources, and so it is important to be critical and consider how much oil might be in your biofuel. Some farming techniques rely on intensive use of fertilizers and other agricultural chemicals all
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