CO3O4/MnO2/CA

توضیحات

 

Type

Color

BET Surface area (m 2 / g) Pore diameter (nm)

Pore volume (cm 3 / g)

Synthesis method

 

saniva1

 

 

 

 

 

 

 

Adsorption / desorption isotherm

saniva2

 

Powder

Black

۱۵۰٫۳

۴٫۷۵

۵٫۱۷۸

Hydrothermal

 

 

.The BJH diagram of shows that there are two types of meso and macro pores in the structure

 

saniva 3

 

Spectrum analysis shows that the phases in the sample are a combination of a-Mn02, Mn O and C0304 phases. The presence of a small amount of Mn203 phase is probably due to calcination of the sample at 300 0 C

 

image 005 scaled

 

 

 

Performance comparision of catalysts

Comparison ofthe performance of different catalysts

Oxygen reduction reaction (ORR)

kOH 0. 1 M. electrolyte

IMG 20220803 121739 532

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

saniva 4

 

 

 

 

 

 

saniva 5

To evaluate the electrocatalytic activity of different catalyst towards oxygen reduction reaction, the cyclic voltammograms (CVs) of five catalysts of Mn02, MnoJCA, CoA-MnoJCA, Mno /RGO and activated carbon were recorded in the presence (O -saturated) of oxygen in 0. I M KOH electrolyte solution at scan rate of 20 mV/s. As can be seen in the cyclic voltammograms (CVs), on the surface of bare carbon cloth electrode in N2-saturated KOH solution, no noticeable oxygen reduction peak is observed while a weak reduction wave is appeared in the 02-purged KOH electrolyte which could be ascribed to the catalytic role of carbon-based substrates for ORR. Among these five catalysts, the RGO a-MnO catalyst shows the most obvious cathodic peak for oxygen reduction, which is in the potential range of 0.2 to -0.6 V

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