Comparison of specific capacity between samples in this paper and reference.

Sample	Specific capacity (mA h g−1)	Current density (mA g−1)	Reference
CuO@HA@CNT	1000.2	100	This work
CuO@HA@CNT	632	500	This work
CuO nanosheets@CNT	540	100	26
Forest-like CuO@CNT	700	425	27
CuO nanospheres@CNT	638	100	28
CuO nanotube networks@CNT	557.7	135	29
CuO nanowires@CNTs	576	67	30