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Developing highly active and stable acidic hydrogen evolution catalysts is of great significance and challenge for the long‐term operation of commercial proton exchange membrane (PEM) electrolyzers. In this work, coplanar ultrathin nanosheets composed of rich‐Frank partial dislocations (FPDs) are first synthesized. Ir nanoparticles and carbon (Dr‐Ir/C NSs) use a nonequilibrium high‐temperature thermal...