An oxide of strontium, iron, and cobalt can absorb and release oxygen, depending on the gases passing over it, with a high number of cycles. This means it could fill a gap in our production of fuel cells that turn hydrogen into electricity, as well as a variety of other potential applications. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Oxygen is very reactive, and there are many materials that will bond with it in some circumstances and release it in others. Plants and animals, in their different ways, have both made this a key part of their success. However, the process can be perilous, frequently degrading materials quickly. In other cases, the temperatures required to make a material “breathe” are sufficiently extreme, for exam

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