marginally significantp ‐value = 0.0558
The t ‐test and ANOVA results showed a marginally significant difference in capacitance retention percentage ( t ‐statistic = −1.9, p ‐value = 0.0558) between the NiCo 2 S 4 and NiCo 2 S 4 /graphene composites, suggesting potential differences in cyclic stability.