Construction of mesoporous Cu-doped Co 9 S 8 rectangular nanotube arrays for high energy density all-solid-state asymmetric supercapacitors

A self-templating strategy was used to prepare novel mesoporous Cu-doped Co 9 S 8 rectangular nanotube arrays (Cu-Co 9 S 8 NTAs) as an advanced electrode for all-solid-state asymmetric supercapacitors, which deliver a high energy density of 71.93 W h kg −1 at a power density of 750 W kg −1 .