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Keywords:

  • amine–boranes;
  • density functional calculations;
  • hydrogen storage;
  • NMR spectroscopy;
  • sustainable chemistry
Thumbnail image of graphical abstract

Going full circle: Ammonia borane is a potential H2-releasing fuel. Polyborazylene, a form of the spent fuel, can be regenerated efficiently in a one-pot process by the stepwise addition of appropriate digesting and reducing agents. A unique feature of this process is the formation of NH3, which is retained by some of the digested species.