Anonymous asked in EnvironmentAlternative Fuel Vehicles · 1 decade ago

Technological Hurdles with Hydrogen fuel!!?

The big question with the hydrogen economy is, "Where does the hydrogen come from?" After that comes the question of transporting, distributing and storing hydrogen. Hydrogen tends to be bulky and tricky in its natural gaseous form.

Once both of these questions are answered in an economical way, the hydrogen economy will be in place.

2 Answers

  • 1 decade ago
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    Where does the hydrogen come from?

    One of the more interesting problems with the hydrogen economy is the hydrogen itself. Where will it come from? With the fossil fuel economy, you simply pump the fossil fuel out of the ground (see How Oil Drilling Works) and refine it (see How Oil Refining Works). Then you burn it as an energy source.

    Most of us take oil, gasoline, coal and natural gas for granted, but they are actually quite miraculous. These fossil fuels represent stored solar energy from millions of years ago. Millions of years ago, plants grew using solar energy to power their growth. They died, and eventually turned into oil, coal and natural gas. When we pump oil from the ground, we tap into that huge solar energy storehouse "for free." Whenever we burn a gallon of gasoline, we release that stored solar energy.

    In the hydrogen economy, there is no storehouse to tap into. We have to actually create the energy in real-time.

    There are two possible sources for the hydrogen:

    Electrolysis of water - Using electricity, it is easy to split water molecules to create pure hydrogen and oxygen. One big advantage of this process is that you can do it anywhere. For example, you could have a box in your garage producing hydrogen from tap water, and you could fuel your car with that hydrogen.

    Reforming fossil fuels - Oil and natural gas contain hydrocarbons -- molecules consisting of hydrogen and carbon. Using a device called a fuel processor or a reformer, you can split the hydrogen off the carbon in a hydrocarbon relatively easily and then use the hydrogen. You discard the leftover carbon to the atmosphere as carbon dioxide.

    The second option is, of course, slightly perverse. You are using fossil fuel as the source of hydrogen for the hydrogen economy. This approach reduces air pollution, but it doesn't solve either the greenhouse gas problem (because there is still carbon going into the atmosphere) or the dependence problem (you still need oil). However, it may be a good temporary step to take during the transition to the hydrogen economy. When you hear about "fuel-cell-powered vehicles" being developed by the car companies right now, almost all of them plan to get the hydrogen for the fuel cells from gasoline using a reformer. The reason is because gasoline is an easily available source of hydrogen. Until there are "hydrogen stations" on every corner like we have gas stations now, this is the easiest way to obtain hydrogen to power a vehicle's fuel cell.

    The interesting thing about the first option is that it is the core of the real hydrogen economy. To have a pure hydrogen economy, the hydrogen must be derived from renewable sources rather than fossil fuels so that we stop releasing carbon into the atmosphere. Having enough electricity to separate hydrogen from water, and generating that electricity without using fossil fuels, will be the biggest change that we see in creating the hydrogen economy.

    Where will the electricity for the electrolysis of water come from? Right now, about 68 percent (reference) of the electricity produced in the United States comes from coal or natural gas. All of that generating capacity will have to be replaced by renewable sources in the hydrogen economy. In addition, all of the fossil fuel energy now used for transportation (in cars, trucks, trains, boats, planes) will have to convert to hydrogen, and that hydrogen will be created with electricity, as well. In other words, the electrical generating capacity in the country will have to double in order to take on the demands of transportation, and then it will all have to convert from fossil fuels to renewable sources. At that point, and only at that point, will the flow of carbon into the atmosphere stop.

    Right now there are several different ways to create electricity that do not use fossil fuels:

    Nuclear power

    Hydroelectric dams

    Solar cells

    Wind turbines

    Geothermal power

    Wave and tidal power

    Co-generation (For example, a sawmill might burn bark to create power, or a landfill might burn methane that the rotting trash produces.)

    In the United States, about 20 percent of the power currently comes from nuclear and 7 percent comes from hydroelectric. Solar, wind, geothermal and other sources generate only 5 percent of the power -- hardly enough to matter.

    In the future, barring some technological breakthrough, it seems likely that one of two things will happen to create the hydrogen economy: Either nuclear-power or solar-power generating capacity will increase dramatically. Remember that, in a pure hydrogen economy, the electrical generating capacity will have to approximately double because all of the energy for transportation that currently comes from oil will have to be replaced with electrically generated hydrogen. So the number of power plants will double, and all of the fossil fuel plants will be replaced.

    The electrical-generation problem is probably the biggest barrier to the hydrogen economy. Once the technology is refined and becomes inexpensive, fuel-cell vehicles powered by hydrogen could replace gasoline internal combustion engines over the course of a decade or two. But changing the power plants over to nuclear and solar may not be so easy. Nuclear power has political and environmental problems, and solar power currently has cost and location problems.

    How do you store and transport the hydrogen?

    At this moment, the problem with putting pure-hydrogen vehicles on the road is the storage/transportation problem. Hydrogen is a bulky gas, and it is not nearly as easy to work with as gasoline. Compressing the gas requires energy, and compressed hydrogen contains far less energy than the same volume of gasoline. However, solutions to the hydrogen storage problem are surfacing.

    For example, hydrogen can be stored in a solid form in a chemical called sodium borohydride, and this technology has appeared in the news recently because Chrysler is testing it. This chemical is created from borax (a common ingredient in some detergents). As sodium borohydride releases its hydrogen, it turns back into borax so it can be recycled.

    Once the storage problem is solved and standardized, then a network of hydrogen stations and the transportation infrastructure will have to develop around it. The main barrier to this might be the technological sorting-out process. Stations will not develop quickly until there is a storage technology that clearly dominates the marketplace. For instance, if all hydrogen-powered cars from all manufacturers used sodium borohydride, then a station network could develop quickly; that sort of standardization is unlikely to happen rapidly, if history is any guide.

    There might also be a technological breakthrough that could rapidly change the playing field. For example, if someone could develop an inexpensive rechargeable battery with high capacity and a quick recharge time, electric cars would not need fuel cells and there would be no need for hydrogen on the road. Cars would recharge using electricity directly.

  • 4 years ago

    Well, its not quite feasible yet. One, we do not have the Hydrogen infrastructure to support Hydrogen vehicles. When i say infrastructure, i mean filling stations, electrolyzer plants to split the water, distribution systems, etc.. two, the cost is way too high right now and the efficiency of this Hydrogen system is worse than just using gasoline. Efficiency: Approximately the same amount of energy is used to split the water molecules as you generate from re-combining the Hydrogen Molecules in a fuel cell. That's not mentioning the energy loss in heat and in any other distribution systems, pressurizing systems, etc.. Currently the efficiency of a hydrogen based economy is 25% once everything is taken int consideration. The only way hydrogen makes sence is if the home user generates their own hydrogen using some sort of alternative energy (solar, wind, tidal,etc..). Even if huge electrolyzer plants use renewable energy to split the molecules, the distribution process will still ruin the efficiency. So you answer is: to expensive, no infastructure and not efficient enough.

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