Tailored design of an oxygen-rich stable Co-MOF integrated with MXene nanofibers as an advanced heterostructure for high-performance ammonium-ion supercapacitors

A Co-MOF with (O 4 –Co–N 2 ) sites was integrated with Ti 3 C 2 T x MXene carbonized nanofibers, achieving 980 F g −1 at 1 A g −1 and 91.1% retention after 16 000 cycles. Further, the device delivered 41.5 mW h kg −1 energy density.