Electrodes: Engraving Copper Foil to Give Large‐Scale Binder‐Free Porous CuO Arrays for a High‐Performance Sodium‐Ion Battery Anode (Adv. Mater. 14/2014)

X.-B. Zhang and co-workers report on page 2273 aligned porous CuO nanorod arrays obtained by a facile and scalable in situ engraving Cu foil method. When directly used as a flexible and binder-free sodium-ion battery anode without adding auxiliary materials, a superior electrochemical performance, including cycle stability and rate capability even at room temperature, are obtained. This can be attributed to the unique array structure and the binder-free electrode.