TY  - JOUR
TI  - Investigation of the oxygen reduction kinetics and mechanism on ordered mesoporous
carbon-supported Pt-based catalysts
AB  - The kinetics and mechanism of oxygen reduction reaction (ORR) on the surface of Pt and PtAgFe catalysts supported by ordered mesoporous carbon (OMC) were investigated. Metal particles were loaded by the wet impregnation-reduction method on two types of OMC, one being surface-modified by $HNO_3$ and the other unmodified. Cyclic voltammetry measurements showed that Pt on modified OMC, namely Pt/OMC-M, had the highest electroactive surface area among OMC-supported catalyts with 987 cm2 /mg. This catalyst had also a mass activity of $39.1 mA/mg_{Pt}4, which was the same as the carbon black supported commercial Pt/C catalyst. Rotating disk electrode (RDE) studies revealed that the net number of transferred electrons for OMC supported Pt and PtAgFe catalysts were in the range between 3 and 4, indicating a predominant 4-electron water formation route. The ORR mechanisms on Pt/OMC and PtAgFe/ OMC were found to be similar with that of Pt/C; however, the associative mechanism was pronounced at a wider potential range. The modified OMC-supported catalysts showed higher oxygen reduction activities in general.
AU  - Güneş, Silver
AU  - Güldür, Fatma Çiğdem
DO  - 10.3906/kim-2102-68
PY  - 2022
JO  - Turkish Journal of Chemistry
VL  - 46
IS  - 2
SN  - 1300-0527
SP  - 530
EP  - 541
DB  - TRDizin
UR  - http://search/yayin/detay/530715
ER  -