PBI/H_3PO_4体系高温PEMFC的性能预测

使用实际测量的PBI/H_3PO_4体系高温PEMFC,在不同温度、压力、阴极气体和负载下的稳态电位响应数据(500组)与该体系对温度变化、压力变化的动态电位响应数据(500组)作为训练数据,建立了基于BP神经网络和Matlab/Simulink的高温PEMFC稳定性能和动态性能的预测系统。利用神经网络模型模拟电池的稳态电位输出和单变量(温度或压力)动态电位响应。仿真结果表明:该模型能准确地模拟电池的稳态和动态行为,为PBI/H_3PO_4体系高温PEMFC的性能预测和控制提供了一条可行的途径

多硫化钠-溴化钠氧化还原液流电池研究

在全电池中用稳态方法研究了不同电极材料对电池正负极电化学反应极化行为的影响。以聚丙腈碳毡为正极材料，泡沫镍为负极材料，4mol／L NaBr、1．3mol／LNa2S4为正、负极电解液，测定了(28±1)℃时电池的库仑效率、电压效率、能量效率及电池的能量密度随充放电电流密度的变化规律，分析了大电流密度下电池电压效率下降的原因。以聚丙腈碳毡及泡沫镍为正负极材料所组成的电池能量效率约71％，能量密度约66，4mW／cm^2(50mA／cm^2充放电)，电池的欧姆内阻压降是大电流密度下电池电压效率下降的主要原因

多硫化钠-溴化钠氧化还原液流电池研究

在全电池中用稳态方法研究了不同电极材料对电池正负极电化学反应极化行为的影响。以聚丙腈碳毡为正极材料，泡沫镍为负极材料，4mol／L NaBr、1．3mol／LNa2S4为正、负极电解液，测定了(28±1)℃时电池的库仑效率、电压效率、能量效率及电池的能量密度随充放电电流密度的变化规律，分析了大电流密度下电池电压效率下降的原因。以聚丙腈碳毡及泡沫镍为正负极材料所组成的电池能量效率约71％，能量密度约66，4mW／cm^2(50mA／cm^2充放电)，电池的欧姆内阻压降是大电流密度下电池电压效率下降的主要原因

High-cycle and very-high-cycle fatigue lifetime prediction of additively manufactured AlSi10Mg via crystal plasticity finite element method

The effects of defects and building directions in additive manufactured AlSi10Mg on its high-cycle fatigue and very-high-cycle fatigue performance are studied based on crystal plasticity finite element (CPFE). Among the three models provided in this work, the results of model 2 (N-p2) are in good agreement with the experimental ones. It is found the fatigue life of the sample with defects are much lower than that without defects. 0 degrees specimens have a better fatigue performance than 90 degrees ones. This work is beneficial in determining the fatigue lifetime and helps to improve the fatigue behavior of AlSi10Mg

Synthesis of Monolithic Carbon/Nickel Oxide Composite Electrode Material and Cyclic Voltammetry Characteristics

应用离子交换法将N i2+离子引入酚醛凝胶并碳化,制备出块状的碳/氧化镍(C/N iO)复合物材料.原子吸收光谱(AAS)、X射线衍射(XRD)和循环伏安测试(CV)表明,样品中引入的N i含量可以达到5.9%(by m ass),其存在形式主要是N iO,伴有少量未被氧化的金属N i,比电容和电容性能以N i含量为4.4%的表现最佳.Monolithic carbon/nickel oxide composite materials were synthesized by carbonization of phenol formaldehyde gels that were ion-exchanged with Ni~(2+).Atomic absorption spectroscopy and powder X-ray diffraction technique were used to characterize the chemical composition and physical structure of the materials.The nickel dope amount for this method can reach 5.9 %(by mass).Subsequent cyclic voltammetry experiments indicate that the materials exhibit best capacitive performance at the nickel content of 4.4 %.作者联系地址：南开大学高分子化学研究所功能高分子材料教育部重点实验室南开大学-天津大学联合研究院,南开大学高分子化学研究所功能高分子材料教育部重点实验室南开大学-天津大学联合研究院,南开大学高分子化学研究所功能高分子材料教育部重点实验室南开大学-天津大学联合研究院,南开大学高分子化学研究所功能高分子材料教育部重点实验室南开大学-天津大学联合研究院 天津300071,天津300071,天津300071,天津300071Author's Address: Key Laboratory of Functional Polymer Materials,Ministry of Education,Institute of Polymer Chemistry,N&T Joint Academy,Nankai University,Tianjin 300071,Chin