Magnetron sputtering of platinum on nitrogen-doped polypyrrole carbon nanotubes as an efficient and stable cathode for lithium–carbon dioxide batteries

An efficient cathode catalyst for Li–CO 2 batteries is fabricated by magnetron sputtering Pt on hollow N-doped carbon nanotubes, which demonstrate an ultrahigh discharge capacity of 29 614 mA h g −1 and a low cut-off overpotential of 0.75 V.