(Hydrogen bonds) may undergo a breaking.Logical formLearned from3 sentences. (Hydrogen bonds) may break.Logical formLearned from3 sentences. A set can be constituted-of-or-filled-with (hydrogen bonds).Logical formLearned from3 sentences. A (fuel cell) may use hydrogen.Logical formLearned from3 sentences. Persons may apply catalysts to (hydrogen generation).Logical formLearned from3 sentences. Materials may be needed for (hydrogen production).Logical formLearned from3 sentences. New horizons can be for (hydrogen production).Logical formLearned from3 sentences. Hurdles can be on a path to achieving a vision of the (hydrogen economy).Logical formLearned from3 sentences. Breakthroughs may impact a thermodynamic efficiency of (hydrogen production).Logical formLearned from3 sentences. Opportunities can be for (hydrogen reactions).Logical formLearned from3 sentences. A (hydrogen production) can be competitive.Logical formLearned from3 sentences. (Hydrogen production) may require catalysts.Logical formLearned from3 sentences. Processes may be associated with (hydrogen update).Logical formLearned from3 sentences. A (hydrogen production) can be enhanced.Logical formLearned from3 sentences. A hydrogen can be low-pressure.Logical formLearned from3 sentences.