Researchers from the Technical University of Denmark (DTU) have 3D-printed a lightweight ceramic fuel cell that they call the Monolithic Gyroidal Solid Oxide Cell:
The team implemented a custom design inspired by the natural construction of coral. This shape optimizes surface area while the material composition allows for a much lighter-weight end product. Most fuel cells are comprised of metal, which contributes greatly to their weight. This fuel cell is apparently completely ceramic.
The intricate design is known as a gyroid and is a type of triply periodic minimal surface (shortened to TPMS). These surfaces are intended to provide as much surface area as possible. It’s beneficial, particularly in this case, as the surface provides more optimal heat dispersion. According to the development team, the cell is capable of producing more than a watt of power for each gram of its own weight.
It’s cool that they can do that, but the main point of fuel cells is to power vehicles. Ceramics aren’t known for their ability to handle potholes.