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Highly active PtxPdy/SnO2/C catalyst for dimethyl ether oxidation in fuel cells
Journal of Power Sources ( IF 8.1 ) Pub Date : 2018-06-15 , DOI: 10.1016/j.jpowsour.2018.06.002
Diwakar Kashyap , Hanan Teller , Alex Schechter

Dimethyl ether (DME) is a nontoxic gas that is considered a potential fuel for direct-feed proton exchange membrane fuel cells (PEMFCs). DME has several advantages over other fuels, including high energy density, pumpless fuel delivery, liquefied storage, low toxicity and minimal crossover through Nafion® membranes in PEMFC. However, the low activity of the state-of-the-art catalyst (Pt50Ru50) for DME oxidation is the main hurdle in the development of efficient fuel cell devices. In this work, fine layers of SnO2 on high surface-area carbon (PtxPdy/SnO2/C) catalysts were synthesized by ethylene glycol-assisted reduction and characterized by X-ray diffraction, TEM, EDX, XPS, and ICP-OES. The electro-oxidation of DME was systematically studied in a conventional three-electrode cell and a laboratory prototype direct DME fuel cell (DDMEFC) operating at 70 °C. Compared to other catalysts reported for DME oxidation, the Pt0.75Pd0.25/SnO2/C shows higher specific power density in both the conventional three-electrode cell and the fuel cell configurations. The peak power density delivered by direct gas feed DDMEFCs is 110 mW cm-2 at 0.4 V with only 1.2 mg cm−2 of platinum group metal (PGM) loading.



中文翻译:

用于燃料电池中二甲醚氧化的高活性Pt x Pd y / SnO 2 / C催化剂

二甲醚(DME)是一种无毒气体,被认为是直接进料质子交换膜燃料电池(PEMFC)的潜在燃料。DME具有优于其它燃料,包括高能量密度,无泵的燃料输送,液化贮存,低毒性和最小的交叉通过的Nafion几个优点®在PEMFC的膜。然而,最新的催化剂(Pt 50 Ru 50)对DME氧化的低活性是开发高效燃料电池装置的主要障碍。在这项工作中,的SnO精细层2上的高表面积碳(PT Xý /的SnO 2/ C)催化剂是通过乙二醇辅助还原合成的,并通过X射线衍射,TEM,EDX,XPS和ICP-OES进行了表征。在常规的三电极电池和在70°C下运行的实验室原型直接DME燃料电池(DDMEFC)中,系统地研究了DME的电氧化。与报道的用于DME氧化的其他催化剂相比,Pt 0.75 Pd 0.25 / SnO 2 / C在常规的三电极电池和燃料电池配置中均显示出更高的比功率密度。由直接供气的DDMEFC输送的峰值功率密度 在0.4 V时为110 mW cm -2,仅载有1.2 mg cm -2的铂族金属(PGM)。

更新日期:2018-06-15
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