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Direct Dimethyl Ether Fuel Cell with Much Improved Performance

机译：直接二甲醚燃料电池，性能大大提高

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摘要

Due to several apparent advantages over methanol, dimethyl ether (DME) has been viewed as a promising alternative fuel for direct fuel cell technology. Similar to methanol, DME oxidation requires a surface oxidant, such as OH, for the removal of adsorbed CO. Consequently, the reaction occurs at much faster rates on binary PtRu catalysts than Pt alone. In this work, PtRu catalysts with a wide variety of Pt-to-Ru ratios were systematically studied in the direct DME fuel cell (DDMEFC) operating at 80 °C. A Pt_(50)Ru_(50) catalyst was found to perform the best at high and middle voltages, while a Pt_(80)Ru_(20) catalyst performed best at low voltages. DDMEFC operation conditions, such as DME flow rate, anode back pressure, DME-to-water molar ratio, and membrane thickness, were also studied in order to maximize the cell performance. A maximum power density of 0.12 W cm~(-2) obtained in this work exceeds the highest reported DME performance. In comparison with the direct methanol fuel cell (DMFC), the optimized DDMEFC performs better at cell voltages higher than 0.55 and 0.49 V with feed concentrations of methanol of 0.5 and 1.0 M, respectively.
机译：由于相对于甲醇有几个明显的优势，因此二甲醚（DME）被视为直接燃料电池技术的有希望的替代燃料。与甲醇相似，DME氧化需要表面氧化剂（例如OH）以除去吸附的CO。因此，在二元PtRu催化剂上，该反应的发生速度比单独的Pt快得多。在这项工作中，在80°C下运行的直接DME燃料电池（DDMEFC）中系统地研究了Pt / Ru比例广泛的PtRu催化剂。发现Pt_（50）Ru_（50）催化剂在高压和中压下表现最佳，而Pt_（80）Ru_（20）催化剂在低压下表现最好。为了最大程度地提高电池性能，还研究了DDMEFC操作条件，例如DME流速，阳极背压，DME与水的摩尔比和膜厚度。这项工作获得的最大功率密度为0.12 W cm〜（-2），超过了报道的最高DME性能。与直接甲醇燃料电池（DMFC）相比，优化的DDMEFC在高于0.55和0.49 V的电池电压下的甲醇进料浓度分别为0.5和1.0 M时表现更好。

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