What's beyond oil? This question is leading to one of the most important debates these days. Even if oil resources are only decreasing slowly (but surely), other options to power the future are essential in consideration of climate changes due to greenhouse gas emissions. An obvious solution can be found looking at the perpetual solar energy supply, especially in regions with high availability of sun irradiation. Converting this renewable energy with wind turbines or photovoltaic or solar power plants is common by now. But storing and using the electric energy generated with these technologies is quite difficult because of low energy densities obtained from current battery technologies. By contrast, hydrogen energy storage has the advantage of its higher energy density.
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