Hydrogen Storage in Nanoporous Carbon

Authored by: Klaus D. Sattler , Iván Cabria , María J. López , Julio A. Alonso

Handbook of Nanophysics

Print publication date:  September  2010
Online publication date:  September  2010

Print ISBN: 9781420075526
eBook ISBN: 9781420075533
Adobe ISBN:

10.1201/9781420075533-49

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Abstract

The world energy crisis is not a problem of the amount of energy that we need or we use, but a problem of the speed at which we use energy. Each person in this planet consumes, on an average, 50–70 kWh/day, which means a power of 2–3 kW. The solar radiation reaching the earth’s surface is, on an average, 100 and 250 W/m2 in winter and summer, respectively. Taking into account a conversion efficiency of the present-day solar cells at 12%, a person needs a power of 166–250 m2/day on an average from solar cells in winter and 66–100 m2 in summer. Our society uses small amounts of energy compared with the energy we receive from the sun. However, we consume too much energy in a very short period of time. Hence, it is a problem of power: energy used per unit of time. The reasons for the wide use and success of fossil fuels in the present economy are that they fit this need of “quick energy” and are cheap. These fuels are not clean energy vectors, are responsible of pollution of the environment and global warming, and the economy of many countries depends on foreign fossil fuels, causing from time to time world economic crisis due to insecurity of supply. Besides, they will be exhausted after some decades in the future. Many efforts have been devoted to find clean and “quick energies.”

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