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Generation QR-Code in Software Project 45: Generating Hydrogen Using Solar Energy

Project 45: Generating Hydrogen Using Solar Energy
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which goes into the top half of the cylinder. The weight of this body of water acting on the gas provides a little pressure on the gas enough to speed its return to the fuel cell. We also connect the other pipe to the tank to enable the excess water to return. The fuel cell is connected mechanically as in Figure 17-8. Note that the oxygen feed is connected in the same manner as the hydrogen.
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Preparing the fuel cell for electrolysis
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Before we can electrolyze water, we need to prime the fuel cell with water so that it has something to electrolyze. For this, we will be using distilled water. It is important that the water that you use is distilled water, which should be readily available from the drug store, not just purified water. Water from the tap, even water from the chiller, contains trace elements that have the potential to wreak havoc with the delicate little MEA inside our PEM fuel cell. First of all, you need to prime the fuel cell with water. A syringe and some small bore rubber tubing helps you accomplish this easily. Fill the fuel cell through one of the holes, allowing air to escape from the other. Once you have done this, put the caps back on the gas intake tubes of the fuel cell to prevent any ingress of air. Fill the gas cylinders with water as well, and then connect it all up as shown in Figure 17-8. If there are any little gas bubbles trapped in the pipes, these must be bled out of the system first of all. Now we come to connecting our solar cell.
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Wiring up the solar cell and fuel cell
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Figure 17-7 40 ml gas tank filled with gas.
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Once the mechanical engineering is complete, we need to work on the electrical engineering. Luckily, connection is very simple indeed. Take a peek at Figure 17-9 which shows how it is done.
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Figure 17-8 How to connect the pipes to the fuel cell.
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Figure 17-9 Connecting the two cells.
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Logic should tell you that the red terminal on the fuel cell is positive and the black terminal is negative. Use your crocodile leads to connect things up and put your solar cell somewhere where it will receive good light.
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Observation
Don t hold your breath, the process is going to take a little bit of time! Over time you should observe a number of things happening. Gas will begin to form, and is collected in the two cylinders, displacing the water as it does so. You will notice that twice as much hydrogen is produced as is oxygen.
In fact, at the moment, most hydrogen is produced using a process known as steam reforming. This takes fossil fuels and combines them with steam, which disassociates the hydrogen from the carbon, However, do not be fooled! This process still leaves a whole lot of carbon dioxide to be gotten rid of. At the moment, there is talk of a technology called sequestration. Sequestration involves separating the carbon dioxide emissions from industry or an item of plant. They are then piped to a facility where they can be forced underground into natural geological features which supposedly will keep the carbon locked up under the earth s surface. Put simply, this technique involves hiding the problem by burying it underground. It is a good technology in so far as it allows the oil companies to maintain the status quo by continually producing oil. However, the carbon dioxide is still present albeit sequestered underground. There is also another incentive for companies to adopt sequestration it increases their oil production! By forcing gas underground, more oil comes to the surface. Economically it makes good sense, environmentally the case is yet to be proven. No one has yet tried sequestration on the scale proposed before it is unknown whether this gas will find ways of escaping back to the atmosphere. One method proposed for making hydrogen using solar energy, is to use bacteria to produce it. Using a process of photosynthesis, certain algae and bacteria have been shown to produce hydrogen gas. This hydrogen can be harnessed and used to power the hydrogen economy.
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