The H2 reacts to a glowing splint by burning with a characteristic pop, while the O2 kindles a flame instead. On a weight basis, H2 is the most energy-rich fuel known and burns to give almost pure water. Thus, electricalenergy from the battery has been converted into chemical energy contained in the H2. These electrolyzer devices anticipate the imminent development of a renewable energy economy based on electricity and H2 fuel as complementary energy vectors. As necessary storage time increases, the superior economy of chemical storage more than compensates for this electrolyzer energy expenditure.
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