Dr. Chun-Mei Liu, Yan-Jun Gao, Lei Liu, Peng-Fei Jiang, Jing-Jie Liu
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引用次数: 1
Abstract
Microfluidic fuel cells (MFCs) are potential micro power sources for portable electronics. MFCs utilize the co-laminar flowing of the solutions in the microchannel and remove the membranes in the traditional fuel cells. Flow-through electrodes exploit the internal electrode surfaces and improve the MFC performance. Carbon paper (CP) has been widely used as a flow-through electrode with a limited specific surface area. We have also used graphite felt (GF) with a high specific surface area as the electrode and then compared the performance of the MFCs with the CP and GF as the electrodes, respectively. Firstly, we showed the SEM surface morphologies of the two electrodes with or without the Pd catalysts. Secondly, we compared the electrochemical activities of the two electrodes in the solutions, respectively. The GF electrode always showed higher electrochemical activities than the CP electrode, since the GF electrode owned its larger accessible electrochemical surface area and less electrode resistance than the CP electrode. Thirdly, we compared the performance of the MFCs with the two electrodes. The results showed that the performance of the MFC with the GF electrodes electrodes was optimum, with the peak power density of 175.60 mW cm−2 and limiting current density of 616.53 mA cm−2. Finally, we conducted the discharge performance of the MFCs with the two electrodes. There existed a minor variation in the discharge current densities of the MFCs with the CP cathodes.
微流体燃料电池(mfc)是一种潜在的便携式电子设备微型电源。mfc利用微通道中溶液的共层流,去除传统燃料电池中的膜。流动电极利用内部电极表面,提高了MFC性能。碳纸(CP)作为一种比表面积有限的流动电极已被广泛应用。我们还使用了具有高比表面积的石墨毡(GF)作为电极,然后分别与CP和GF作为电极比较了mfc的性能。首先,我们展示了两个电极在添加或不添加Pd催化剂时的SEM表面形貌。其次,我们分别比较了两个电极在溶液中的电化学活性。GF电极的电化学活性始终高于CP电极,这是由于GF电极比CP电极具有更大的可达电化学表面积和更小的电极电阻。第三,我们比较了两种电极下mfc的性能。结果表明,使用GF电极制备的MFC性能最佳,峰值功率密度为175.60 mW cm−2,极限电流密度为616.53 mA cm−2。最后,我们对mfc在两个电极下的放电性能进行了测试。使用CP阴极的mfc的放电电流密度变化不大。
期刊介绍:
ChemistrySelect is the latest journal from ChemPubSoc Europe and Wiley-VCH. It offers researchers a quality society-owned journal in which to publish their work in all areas of chemistry. Manuscripts are evaluated by active researchers to ensure they add meaningfully to the scientific literature, and those accepted are processed quickly to ensure rapid online publication.