Engraving Copper Foil to Give Large‐Scale Binder‐Free Porous CuO Arrays for a High‐Performance Sodium‐Ion Battery Anode

Arrays of aligned porous CuO nanorods are obtained by a facile and scalable method of engraving Cu foil in situ. Direct use of the arrays as a flexible and binder-free sodium-ion battery anode — without adding auxiliary materials — results in superior electrochemical performance, including cycle stability and rate capability, even at room temperature. This can be attributed to the unique array structure and the lack of binder in the electrode. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.