Electrocatalysts active site concentration

CO bonding to the active sites and difficult product desorption vide infra). In contrast, the peak current density of methanol oxidation decreases with the scan rate (Fig. 14c), even by increasing the concentration of MeOH from 10 to 20 wt%, in an attempt of magnifying the diffiision effects. Apparently, the diffusion of MeOH across the MWCNT support is veiy fast but the electrocatalyst is not sufficiently active and the peak current density decreases by increasing the scan rate. 

A particular electrocatalyst of Co-TPPA GCF (TPP 5, 10, 15, 20-tetrakis(phenyl)-21//, 23//-porphyrin, VGCT vapor growing carbon fiber) heat-treated in He at 1,073 K enhanced the formation of neutral H2O2 remarkably. The maximum concentration of 4.0 M was obtained with 90 mA cm and 42 % current efficiency at 278 K. Electrocatalysis of the Co-TPP/VGCF was excellent turnover frequency of Co as 14 s and total turnover number as 4 x 10 in 8 h. Various characterization data propose that electrochemical active site for reduction of O2 to H2O2 was C0N2CX structure on carbon surface [21]. Direct production of the neutral and halide-... 

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