| 1. | Improvement of power output has also been achieved by increasing the porosity of the anode catalyst layer , so that the co2 produced there can be easily released
本研究还以促进co2气体排放为目标，采用添加造孔剂的方法提高了液体进料dmfc阳极催化剂层的孔隙率，显著地改善了电池性能。 |
| 2. | The decrease of active surface area in the anode caused by co2 accumulation is reduced through treating the diffusion layer and catalyst layer with ptfe , resulting in increased dmfc performance
通过对阳极扩散层和催化剂层的疏水处理，降低了阳极产生的co2导致的催化活性比表面积损失，有效地提高了电池性能。 |
| 3. | The performance of liquid dmfc is evaluated as a function of the composition and structure of meas , hot - pressing condition and activation process by means of v - i polarization and ac impedance spectrometry
本研究采用电流电压极化曲线和交流阻抗谱方法，对膜电极的热压条件、扩散层和催化剂层的组成与结构、电极活化过程等因素对液体进料dmfc性能的影响进行了全面的研究。 |
| 4. | The investigation reveals that the performance of a mea is mainly controlled by the conductivity of membrane , load of catalyst and co2 holding in the anode , ion conductivity and specific of active area in both anode and cathode
研究表明，膜电极性能主要受质子交换膜的电导率、阳极催化剂用量、阳极co2气体和阴极水的传递、催化剂层的活性比表面积和质子电导率等因素控制。 |
| 5. | The experimental results demonstrate that the suitable mea hot - pressing temperature and pressure are 120 and 15 . 5mpa , respectively . the optimum catalyst loading in anode is 4 mg pt / cm2 , and the best contents of nafion ionomer in anode and cathode layer are 45wt % and 35 . 3wt % , respectively
实验结果显示，制备膜电极时最佳的热压温度和压力分别为120和15 . 5mpa ；阳极催化剂的适宜载量为4mgpt / cm2 ；阳极和阴极催化剂层的nafion最优含量分别为45 . 0wt %和35 . 3wt % 。 |
| 6. | In this paper the anode porous diffusion layer model of dmfc for mass transfer has been described on the basis that all components are gaseous and well mixed . the purpose of the model is to determine the variation in concentration of species in the diffusion layer and thus the concentration of the reactive species at the edge of the reaction layer
本文还推导出了气相进料的dmfc阳极多孔扩散层模型，模型详细描述了甲醇，水以及二氧化碳在扩散层中的传递和反应，使用本模型可以确定各种物质在阳极多孔扩散层中浓度的变化，并可由此确定气体扩散层催化剂层边界处反应物质的浓度。 |
| 7. | Special attention is paid to the consequences of methanol crossover in cathode reaction and cathode over - potential . good agreement is found between simulations and experiments in regard to the v - i character of dmfcs . based on the theory of parallel electrode reaction , it becomes possible to obtain quantitatively the value of over - potential caused by methanol crossover , which is either implicit or not included in the overall cathode over - potential in previous models
该模型涵盖了dmfc中的主要物理化学过程，包括：甲醇水溶液在膜电极内的扩散、对流和电迁移；质子在阳极催化剂层和阴极催化剂层内的传递；氧气、水蒸汽在阴极的扩散；阳极催化剂层内的甲醇氧化反应动力学；以及阴极催化剂层内的氧还原和甲醇氧化反应动力学。 |
