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本文报道H2-O2型碱性聚合物电解质燃料电池(APEFC)电极疏水性对放电性能的影响.以季铵化聚砜(QAPS)或自交联型季铵化聚砜(xQAPS)碱性聚电解质(APE)作为隔膜和电极中的电解质(Ionomer)、聚四氟乙烯(PTFE)作为疏水添加剂调控催化层疏水性.结果表明,阳极催化层疏水性的增强有利于提升电池放电性能,而阴极催化层疏水性适中时电池性能最优.采用疏水性较强的xQAPS作为电解质并在阳极催化层中添加适量PTFE疏水剂,在60oC和100%相对湿度的条件下,280 mA·cm-2电流密度时,电池最高功率密度达132 mW·cm-2. 相似文献
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The Hall tube as a minimum model to simulate the integer quantum Hall effect is essential for exploring topological physics, while it has not been constructed in the recent developing successfully experiments on superconducting circuits. In this work, we propose a feasible experiment scheme using three legs superconducting circuits with transmon qubits to realize a Hall tube. Then we first investigate its topological properties. Since the time-reversal, particle-hole, and chiral symmetries are all broken for the system, the Hall tube belongs to the A class of the Altland-Zirnbauer classification. We obtain the corresponding topological phase transition both numerically and analytically. Since the chirality is a key character of the quantum Hall effect, we secondly investigate the chiral physics in the Hall tube. We find the topological protected chiral edge currents and discuss its robustness. Finally, we give the possible experimental observations of the topological state and topological protected chiral edge currents. 相似文献
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In this paper, we will present some strong convergence results for sequences of ψ-mixing random variables. The results for sequences of ψ-mixing random variables generalize the corresponding results for independent random variable sequences without any extra conditions. 相似文献
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用改良的浸渍法合成了多种不同合金度的碳载PdCu纳米粒子,考察其对氧还原和氢氧化反应的催化行为,并择优应用到质子交换膜燃料电池(PEMFC)中.研究发现,阳极采用Pd80Cu20/C催化剂,阴极采用Pd90Cu10/C催化剂组装的单电池在65℃下最大功率密度接近204 mW/cm2. 相似文献
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