Pt-modified Au/C catalysts for direct glycerol electro-oxidation in an alkaline medium

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Lertthahan P., Yongprapat S., Therdthianwong A., Therdthianwong S.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2017

วารสาร: International Journal of Hydrogen Energy (0360-3199)

Volume number: 42

Issue number: 14

หน้าแรก: 9202

หน้าสุดท้าย: 9209

จำนวนหน้า: 8

นอก: 0360-3199

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85006791698&doi=10.1016%2fj.ijhydene.2016.05.120&partnerID=40&md5=816406b8dfbc63b738fb294396fa62c1

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Au-based catalysts promoted with Pt were prepared by using polyvinyl alcohol protection method. Different amounts of Pt (5, 10 and 15% of total metal) were added in the Au sol formation step to improve the activity of Au/C toward glycerol electro-oxidation in an alkaline medium. The physical and electrochemical properties of the as-prepared catalysts were explored. The average particle sizes of the Au/C and Pt-modified Au/C catalysts measured by transmission electron microscopy (TEM) were the same at around 4 nm. The PtAu/C alloy formation in the PtAu/C catalysts was confirmed by the increase of lattice parameter calculated from the X-ray diffraction (XRD) patterns and by the absence of Pt ring in the electron diffraction pattern. The change of binding energy in X-ray photoelectron spectroscopy (XPS) results indicated the interaction between Pt and Au. For glycerol electro-oxidation in an alkaline medium, the PtAu/C catalysts were more active than the Au/C catalyst as observed from an early onset potential and a shift of potential at maximum current density to a lower potential. Among the Pt-modified Au/C catalysts, the most active catalyst was Pt1Au9/C. The synergistic effects between Pt–Au was proven by a better performance of the PtAu/C compared to the physical mixed catalyst of Au/C and Pt/C at the same Pt:Au ratio. The Pt-modified Au/C catalysts were more stable than the Au/C, especially in a high potential region. This enhancement may be caused by the promotion effect of highly active PtO on the surface of the bimetallic catalyst. © 2016 Hydrogen Energy Publications LLC

คำสำคัญ

Direct alcohol alkaline fuel cell, PtAu/C