▎ 摘　　要

The effect of graphene (G) addition on YBa2Cu3O7-delta (G) (x) (x = 0 - 0.03 wt%) has been studied using the X-ray diffraction method, scanning electron microscopy, electrical resistance versus temperature, transport critical current density J (c), and AC susceptibility measurements. XRD patterns showed single-phase YBa2Cu3O7-delta (YBCO) for all samples. SEM micrographs showed filling of the voids between YBa2Cu3O7-delta grains as graphene was added. The temperature-dependent electrical resistance curves showed metallic normal state behavior and onset transition temperature T (conset) between 90 and 92 K for all samples. AC susceptibility measurement showed transition temperature between 90 and 93 K. was maintained or improved slightly as graphene was added. The x = 0.001 wt% showed the highest J (c), i.e., 2750 A cm(-2) at 77 K and 5570 mA cm(-2) at 30 K which was 13 and 40 times higher than that of the non-added YBCO, respectively. The peak temperature T (p) of the imaginary part of the susceptibility chi (aEuro3) was around 78-82 K for all samples indicating grain coupling was not weakened as graphene was added.