Sample

Temperature of reduction Peaks (˚C)

Ratio of Co³⁺/(Co³⁺ + Co²⁺)

Ratio of O_ads/(O_ads + O_latt)

nanocloud Co₃O₄

306, 412

0.68

0.40

nanosphere Co₃O₄

297, 416

0.66

0.41

nanobook Co₃O₄

327, 440

0.68

0.43

nanoflower Co₃O₄

302, 381

0.64

0.40

nanorods Co₃O₄

369, 488

0.72

0.31