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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Highly disperse Palladium nanoparticles: synthesis and the role of pyrrolic and pyridinic nitrogen on reduced graphene oxide boosting superior electrocatalytic activity for ORR

2019년 8월 20일 18시 08분 25초
ELEC.P-405 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
저자 및
Nipa Roy, seungwon Jeon Jeon seung-won1,*
Chemistry, Chonnam National University, Korea
1Department of Chemistry, Chonnam National University, Korea
The present study shows 3-aminomethylpyridine (AMP) functionalization of reduced graphene supported palladium nanoparticles (AMP-rGO-Pd) for the catalytic oxygen reduction reaction (ORR) in alkaline media. The as-prepared AMP-rGO-Pd nanocomposite was characterized using X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. This study strongly indicated that the covalent functionalized reduced graphene oxide contains the nitrogen group in the pyridinic form where the palladium (Pd) nanoparticles distributed homogenously on the 3-aminomethylpyridine functionalization of reduced graphene (AMP-rGO). Also, X-ray photoelectron spectroscopy demonstrated that the reduction process was performed successively with the increasing C/O ratio from 0.49 to 1.25. The obtained crystalline feature of as-prepared AMP-rGO-Pd from X-ray diffraction (XRD), it was also worth noting that the highly dispersed palladium nanoparticles are well set on the covalent functionalization graphene oxide. The catalytic performance of AMP-rGO-Pd was examined through cyclic voltammetry, linear sweep voltammetry, rotating disk electrode, and rotating ring disk electrode techniques in 0.1 Molar KOH solution. The AMP-rGO-Pd catalyst showed superior ORR onset potential, higher peak current density, remarkable methanol tolerance as well as magnificent stability in case of alkaline media. Moreover, AMP-rGO-Pd exhibited a four-electron reduction pathway for ORR with minor hydrogen peroxide (H2O2) yield due to the synergistic effect shown by AMP-rGO and highly dispersed Pd nanoparticles.