Effect of pre-treatment approach of a carbon support on activity of PtSn/C electrocatalysts for direct ethanol fuel cells

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

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รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Thepkaew J., Therdthianwong S., Therdthianwong A.

ผู้เผยแพร่: Springer

ปีที่เผยแพร่ (ค.ศ.): 2011

วารสาร: Journal of Applied Electrochemistry (0021-891X)

Volume number: 41

Issue number: 4

หน้าแรก: 435

หน้าสุดท้าย: 444

จำนวนหน้า: 10

นอก: 0021-891X

eISSN: 1572-8838

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-79954623250&doi=10.1007%2fs10800-010-0253-0&partnerID=40&md5=6d437e588bf96cf7831b9745f0d72300

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Vulcan XC-72R carbon was pretreated using acid and thermal activation methods, and the carbons obtained were used as supports for a PtSn/C catalyst synthesized by a successive reduction process. Surface characteristics of the supports, including BET surface area, pHPZC and functional group, were analyzed using physical N2 adsorption, mass titration, acid-base titration, and Fourier transform infrared (FTIR) spectrometer technique, respectively. The prepared PtSn/C catalysts were characterized by X-ray diffractometer (XRD), energy dispersive X-ray spectrometer (EDX), inductively coupled plasma-atomic emission spectrometry (ICP-AES), and transmission electron microscope (TEM) techniques, and then were examined for their behavior under ethanol oxidation as well as for their performance in a direct ethanol fuel cell (DEFC). The results showed that pretreatment by HNO3 produced various oxygenated functional groups on the support surface and increased its acidic property. The strong acidity of the acid-treated support led to an unfavorable condition for the Pt reduction reaction and resulted in low Pt content but high Pt:Sn ratio in the PtSn/C catalyst. On the other hand, thermal activation increased the base functional groups on the carbon surface, which enhanced reduction of Pt precursor, and consequently, provided a small average metal particle size of 2.2 nm. The results from cyclic voltammetry, chronoamperometry and cell performance testing confirmed that the catalytic activity for ethanol oxidation and the performance in the direct ethanol fuel cell of the heat-treated carbon-supported PtSn catalyst was superior to the fresh PtSn/C catalyst and the acid-treated carbon-supported PtSn catalyst. ฉ 2010 Springer Science+Business Media B.V.

คำสำคัญ

Carbon support, Direct ethanol fuel cells, Ethanol oxidation, PtSn/C