Fig. 3
XPS analysis of HOCO: (a) whole-range scan, (b) Co2p scan, and (c) O1s scan; (d) TPR analyses of Co3O4 NP and HOCO; (e) physical properties of Co3O4 NP and HOCO; and (f) zeta potential of HOCO at different pH values
Fig. 3 | Sustainable Environment Research