Electrolysis of CO2 and H2O

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Electrolysis of CO2 and H2O ( electrolysis-co2-and-h2o )

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Chapter 2. Replacing Petroleum with Sustainable Energy Carriers 25 typical example is that the incident solar energy reaching the earth’s surface is equivalent to 9000 times the energy demand [48]. At present, however, aside from solar heat, solar energy is too expensive to be competitive with fossil, nuclear, and wind. Assuming the cost of solar power decreases as expected [49], solar will most likely make a significant contribution to the mix of energy sources that will make up the long-term future energy portfolio. Nuclear provides more concentrated energy in terms of land area, including the power plant and other industrial plants. However, for nuclear fission to sustainably provide electrical or thermal energy to store as an energy carrier, solutions to the disposal of radioactive waste and the control of proliferation of bomb-suitable material must be found. In addition, the great amount of safety measures taken to avoid reactor accidents have significantly increased the cost of nuclear energy. These barriers to sustainability require significant policy efforts and research and development, but they are not insurmountable [50]. Renewable and nuclear sources harness thermal energy, kinetic energy and solar irradiation and are used today to deliver these types of energy directly or to generate electricity. The best and most efficient use of this energy is to directly deliver and use it as much as possible without conversions. However, chemical energy carriers, with their high energy density, are well suited for portable applications such as transportation, as will be discussed further below. Whereas fossil and biomass resources are best used in chemical-to-chemical conversions, renewable and nuclear sources close the door on such processes while opening the door to produce chemical energy carriers by thermolytic, thermochemical looping, electrochemical, photoelectrochemical and photochemical conversions. Most of these processes are in fundamental stages of research that aim to demonstrate viability [51]. Electrochemical energy systems are farther along—today, a small fraction of hydrogen is produced by water electrolysis using inexpensive hydroelectricity, and fuel cells, which have long held interest for their potential to generate electric power from fossil fuels more efficiently than conventional combustion-driven power plants, are heavily researched. High temperature solid oxide cells in particular are making significant progress and approaching economic viability. Recently, various large businesses in California have installed solid oxide fuel cells – by taking advantage of the large self-generation incentives in that state, producing power on-site from natural gas using these cells is economical. Solid oxide cells are also beginning to appear very attractive for efficient conversion of renewable or nuclear electricity to chemical energy by electrolysis, [52] and Chapter 3. Intermittent resources like solar and wind are well suited to supply transportation energy: whereas their intermittency requires additional storage expenses in the power sector which requires energy on demand, vehicles store the energy on-board as an energy carrier, and with the right infrastructure the energy could be stored at any time of day, when it is available.

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