Abstract
Nanocatalysts![Figure][1] Transmission electron microscope image of platinum cubic nanocages PHOTO: XIA LABORATORY Although platinum is an excellent catalyst for the oxygen reduction reaction that occurs in fuel cells, its scarcity continues to drive efforts to improve its utilization. Zhang et al. made nanocages of platinum by coating palladium nanocrystals with only a few layers of platinum and then etching away the palladium core (see the Perspective by Strasser). Platinum nanocages made using nanoscale octahedra and cubes of palladium displayed different catalytic activity for the oxygen reduction reaction. Science , this issue p. [412][2]; see also p. [379][3] [1]: pending:yes [2]: /lookup/doi/10.1126/science.aab0801 [3]: /lookup/doi/10.1126/science.aac7861
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