On efficiencies, emissions, and the colors of hydrogen—An update
Abstract
Compared with electricity, more precisely electric energy, as a secondary form of energy, hydrogen as an energy carrier, an energy storage material, and a chemical reagent are of growing importance. This change is driven mostly by ecological reasons with hydrogen replacing fossil fuels and materials finally reducing the emission of greenhouse gases, it is also relevant because of its conceivable use as an energy carrier in transportation. This update starts with a brief collection of common definitions and terminology and moves across a critical assessment of common misunderstandings towards current and future uses of hydrogen on to future perspectives with a particular focus on efficiency.
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