共查询到17条相似文献,搜索用时 78 毫秒
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根据已经建立的液体进料直接甲醇燃料电池一维模型讨论甲醇穿透对电池性能的影响.结果表明:电流密度较低时,甲醇穿透对电池性能的影响较大;随着电流密度增大,甲醇穿透对电池性能的影响越来越小. 相似文献
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液相进样直接甲醇燃料电池性能研究 总被引:6,自引:0,他引:6
报道了用研制的Pt-Ru/C催化剂, 采用特殊工艺制备了膜电极, 并组装了直接甲醇质子交换膜单电池系统。考察了电极扩散层制备方法、催化剂层中催化剂、Teflon-C以及Nafion液的用量等电极制备工艺条件以及空气作为氧化剂对单电池性能的影响。结果表明:采用刷涂法制备电极扩散层比喷涂法好,催化剂层中催化剂的优化含量为0.6mg·cm-2,Teflon-C、Nafion液的最佳用量分别为0.3 mg·cm-2、0.5 mg·cm-2。当工作温度为80℃时,输出电压为0.3V,氧气作为阴极气体的输出电流密度为36mA·cm-2;而空气作为阴极气体的输出电流密度为22.5mA·cm-2。膜电极有效面积为9cm2的的液相进样直接甲醇/氧气燃料电池三电池电堆的最大功率为0.285W,此时输出电压为0.7V,输出电流为0.407A;而液相进样直接甲醇/空气三电池电堆的输出电压为0.635V,输出电流为0.252A时,最大功率为0.160W。 相似文献
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分别以MnO2和合成普鲁士蓝(PB/XC-72R)作为催化剂时,考察其对甲醇和双氧水的催化性能,发现两者均可以实现对双氧水的选择性催化。以开发的Z-NiPt为阳极催化剂,以MnO2与PB/XC-72R为阴极催化剂,组成甲醇双氧水单腔体电池,并测试电池的性能。结果表明:以PB/XC-72R为阴极的单腔体燃料电池的最大功率可达9.1 mW。该研究验证了甲醇单腔体新型燃料电池的可行性,为后续甲醇双氧水单腔体燃料电池开发奠定了基础。 相似文献
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综述了质子交换膜在直接甲醇燃料电池中的作用和要求,目前质子交换膜的研究进展,重点介绍了适用于直接甲醇燃料电池用质子交换膜的各种材料的改性方法。按照物理和化学两种方法对几类质子交换膜材料进行改性。同时对比了改性前和改性后各种聚合物膜的物性特点。 相似文献
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阳极催化剂是影响直接甲醇燃料电池(DMFC)性能及成本的主要因素之一,从催化剂载体选择、复合催化剂的制备、非贵金属催化剂研究三方面综述了DMFC阳极催化剂国内外研究现状,并进行了简要分析,展望了其应用前景。 相似文献
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A new method for measuring separately anode and cathode impedances (ZA and ZC) of an electrochemical generator running on constant load is proposed. In these conditions, the measurement of ZA and ZC is not as simple as under galvanostatic conditions. Measurements are carried out first on a dummy cell and next on a commercial direct methanol fuel cell (DMFC) under galvanostatic conditions and using the new proposed method. The comparison of the results validate our method, showing that it is a powerful method for fuel cell electrochemical impedance spectroscopy (EIS) characterization under natural running conditions. 相似文献
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Modelling of performance of PEM fuel cells with conventional and interdigitated flow fields 总被引:6,自引:0,他引:6
A simple mathematical model is developed to investigate the superiority of the interdigitated flow field design over the conventional one, especially in terms of maximum power density. Darcy's equation for porous media and the standard diffusion equation with effective diffusivity are used in the gas diffuser, and a coupled boundary condition given by the Butler–Volmer equation is used at the catalyst layer interface. The performance of PEM fuel cells with a conventional flow field and an interdigitated flow field is studied with other appropriate boundary conditions. The theoretical results show that the limiting current density of a fuel cell with an interdigitated flow field is about three times the current density of a fuel cell with a conventional flow field. The results also demonstrate that the interdigitated flow field design can double the maximum power density of a PEM fuel cell. The modelling results compared well with experimental data in the literature. 相似文献
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Enhancing mass transport in direct methanol fuel cell by optimizing the microstructure of anode microporous layer 下载免费PDF全文
Guangrong Deng Liang Liang Zhao Jin Chenyang Li Changpeng Liu Junjie Ge Wei Xing 《American Institute of Chemical Engineers》2018,64(9):3519-3528
The microstructural characteristics of the anode microporous layer (MPL) can significantly affect the mass transport in direct methanol fuel cells by influencing the methanol delivery and CO2 removal processes. The hydrophilic‐hydrophobic balance and pore structure of the flow path were established by optimizing the content of polytetrafluoroethylene (PTFE) in the anode MPL. An empirical model was developed to design and optimize the anode MPL to achieve better mass transport and cell performance. From the simulated and experimental results, increasing the content of PTFE enhanced the CO2 removal ability in the anode MPL, thereby alleviating CO2 blockage in the anode catalyst layer, whereas the narrowed flow path hindered methanol delivery in the anode MPL. A good balance between methanol delivery and CO2 removal in terms of mass transport was achieved when the PTFE content was adjusted to 15 wt %, leading to the best cell performance. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3519–3528, 2018 相似文献
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Koji Makino 《Electrochimica acta》2005,51(5):961-965
The electrodes prepared by a sputtering method were evaluated as the cathodes for direct methanol fuel cells (DMFCs). Pt loading below 0.25 mg cm−2 achieved higher mass activities than that of 0.5 mg cm−2 prepared by the paste method, which was general conventional method. However, an increase in Pt loading reduced the catalyst activity for the oxygen reduction reaction (ORR). This result may suggest an increase in only electrochemically inactive Pt. Pt utilization efficiency can be found about ten times higher at Pt loading of 0.04 mg cm−2. Moreover, addition of Nafion to sputter-deposited Pt cathodes is found possible to improve the catalyst activity for the ORR, but the excess Nafion over the optimum condition reduces the active sites. 相似文献