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The recent discovery of H3S and LaH10 superconductors with record highsuperconducting transition temperatures, Tc, at high pressure, has fueled thesearch for room-temperature superconductivity in the compressed superhydrides.Here we predict the existence of an unprecedented hexagonal HfH10, with anextraordinarily high Tc of around 213-234 K at 250 GPa. In HfH10, the H atomsare arranged in clusters to form a planar "penta-graphene-like" sublattice, incontrast to the covalent sixfold cubic structure in H3S and clathrate-likestructure in LaH10. The Hf atom acts as a "precompressor" and electron donor tothe hydrogen sublattice. This "penta-graphene-like" H10 structure is also foundin ZrH10, ScH10 and LuH10 at high pressure, each material showing a high Tcranging from 134 to 220 kelvin. Our study of dense superhydrides with"penta-graphene-like" layered structures opens the door to the exploration andexploitation of a new class of high Tc superconductors.

Hydrogen "penta-graphene-like" structure stabilized by hafnium: a high-temperature conventional superconductor