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Nanomaterials 2021, 11, 1017 6 of 12 Nanomaterials 2021, 11, x FOR PEER REVIEW 6 of 12 Figure 2. TEM images of (a) Co3O4@MWCNT; (b,c) PdCo3O4@MWCNT; (d) STEM image of Figure 2. TEM images of (a) Co O @MWCNT; (b,c) PdCo O @MWCNT; (d) STEM image of Nanomaterials 2021, 11, x FOR PEER REVIEW 3 Pd/Co3O4@MWCNT; (e‒h) EDS elemental mapping for Pd/Co3O4 @MWCNT composite; the size distribution of (i) Co3O4 NPs, (j) Pd NPs, (k) Pd/Co3O4 NPs. 4 3 4 7 of 12 Pd/Co3O4@MWCNT; (e-h) EDS elemental mapping for Pd/Co3O4 @MWCNT composite; the size distribution of (i) Co3O4 NPs, (j) Pd NPs, (k) Pd/Co3O4 NPs. The high concentration of oxygen vacancies could facilitate oxygen adsorption and covalent metal oxide–nanocarbon bonding and enable improved electron transfer across the interface. The specific surface area of Pd/Co3O4@MWCNT was 190.89 m2 g−1, as ob- tained from the BET data presented in Figure 3. Besides, the BET specific surface area results of MWCNTs, Co3O4@MWCNT, and Pd/MWCNT were 89.8 m2 g‒1, 110.2 m2 g‒1, 132.1 m2 g‒1, respectively. The large specific surface area of the synthesized composite fa- cilitated the adsorption and transport of O2 and H2O during the ORR. Figure 3. Brunauer–Emmett–Teller (BET) nitrogen adsorption–desorption isotherms of Pd/Co O @ Figure 3. Brunauer–Emmett–Teller (BET) nitrogen adsorption–desorption isotherms of 3 4 PMdW/CCoN3OT4@anMdWMCWNCTNanTsd. MWCNTs. 3.2. Electrochemical Characterization of Pd/Co3O4@MWCNT Figure 4a displays the cyclic voltammograms of the prepared catalysts in 0.5 M KOH in the range of 0.2‒1.4 V at a scan rate of 10 mV s‒1. For commercial Pd/C with 20 wt.% metal loading, cathodic peaks were observed. The current density profile of Pd/Co3O4@MWCNT had two distinctive maxima of the reduction cathodic peaks at 9.93 mA.cm‒2, which were much higher than those of Co3O4@MWCNT and Pd/C in the samePDF Image | Effect of Co3O4 Nanoparticles on Improving Catalytic Behavior
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