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upstart writes:

Researchers discover safe, easy, and affordable way to store and retrieve hydrogen:

Researchers at the RIKEN Center for Emergent Matter Science (CEMS) in Japan have discovered a compound that uses a chemical reaction to store ammonia, potentially offering a safer and easier way to store this important chemical.

This discovery, published in the Journal of the American Chemical Society on July 10, makes it possible not only to safely and conveniently store ammonia, but also the important hydrogen is [sic] carries. This finding should help lead the way to a decarbonized society with a practical hydrogen economy.

For society to make the switch from carbon-based to hydrogen-based energy, we need a safe way to store and transport hydrogen, which by itself is highly combustible. One way to do this is to store it as part of another molecule and extract it as needed. Ammonia, chemically written as NH₃, makes a good hydrogen carrier because three hydrogen atoms are packed into each molecule, with almost 20% of ammonia being hydrogen by weight.

The problem, however, is that ammonia is a highly corrosive gas, making it difficult to store and use. Currently, ammonia is generally stored by liquefying it at temperatures well below freezing in pressure-resistant containers. Porous compounds can also store ammonia at room temperature and pressure, but storage capacity is low, and the ammonia cannot always be retrieved easily.

The new study reports the discovery of a perovskite, a material with a distinctive repetitive crystal structure, which can easily store ammonia and also allows easy and complete retrieval at relatively low temperatures.

The research team led by Masuki Kawamoto at RIKEN CEMS focused on the perovskite ethylammonium lead iodide (EAPbI₃), chemically written as CH₃CH₂NH₃PbI₃. They found that its one-dimensional columnar structure undergoes a chemical reaction with ammonia at room temperature and pressure, and dynamically transforms into a two-dimensional layered structure called lead iodide hydroxide, or Pb(OH)I.

Journal Reference:
Jyorthana Rajappa Muralidhar, Krishnachary Salikolimi, Kiyohiro Adachi, et al., Chemical Storage of Ammonia through Dynamic Structural Transformation of a Hybrid Perovskite Compound, J. Am. Chem. Soc., 2023. DOI: 10.1021/jacs.3c04181

Original Submission