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| 1 | 车用质子交换膜燃料电池膜电极组件综述显示文摘膜电极是质子交换膜燃料电池的核心部件,为多相物质传输和电化学反应提供场所。质子交换膜、催化剂和气体扩散层是影响膜电极性能、寿命和成本的决定性因素。梳理了质子交换膜和催化剂的种类和特性,并介绍了气体扩散层的基层和微孔层。其中,质子交换膜包括全氟磺酸膜、非氟质子交换膜和复合质子交换膜等;催化剂包括铂基催化剂和无铂催化剂;气体扩散层包括碳纤维纸、碳纤维布和多孔金属材料基层以及微孔层。目前,膜电极组件的研发和生产已经取得了很大的成果,但为了降低成本,提高膜电极性能,简化制备工艺,仍有大量技术需要突破:1、制备高强度、高稳定性、低透气性的超薄质子交换膜;2、研制高活性、高耐久性、低成本的非贵金属催化剂;3、开发机械强度高、排水性优异、厚度薄的气体扩散层。 | 金守一 盛夏 潘兴龙 赵洪辉 赵子亮 | 2019 | 汽车文摘2019，0，12： | 2 |
| 2 | The structural changes of blood pyropolymers and their beneficial electrocatalytic activity toward oxygen reduction显示文摘There is a growing interest in designing more effective fuel cell cathode catalyst precursors.Here the partial pyrolysis of animal bloods has been used to produce the blood pyropolymers,which are an intermediate substance between a polymer and carbonaceous material.These pyropolymers were yielded by carbonization process below 600°C.The structural changes in the pyropolymers were characterized by X-ray diffraction,and their formation was checked by micro-IR spectra,thermogravimetric and differential thermal analysis.Their potential electrocatalytic properties were evaluated using the linear sweep voltammetry in the O2-saturated KOH solution.It is found that the process of pyropolymer formation began about 200°C and completed around500°C.The change of particle phase depends on the formation of the pyropolymers,but has no effect to their internal carbon structures which are controlled by pyrolysis process only.Meanwhile,it is confirmed that the crystalline phases in the pyropolymers can exist at the surface of heat-treated materials.It can be also found that the carbon materials are active toward oxygen reduction and their activity is associated with the carbonization level.Our study will stimulate the designers to design the highly active catalysts by using native blood pyropolymers as the precursors. | GUO ChaoZhong CHEN ChangGuo LUO ZhongLi | 2013 | Chinese Science Bulletin2013，58，30： | 1 |
| 3 | 不同温度对石墨烯掺氮位点的影响及性能测试显示文摘以氧化石墨烯为原料,尿素为掺氮剂,在120~220℃水热条件下,合成一系列不同含氮量的掺氮石墨烯。通过傅里叶红外光谱仪、X射线衍射仪、场发射扫描电镜、X射线光电子能谱仪和电化学测试仪等手段对样品的形貌结构及电性能进行研究。结果表明:在不同温度下,制备的掺氮石墨烯呈多孔网状结构,材料内部网孔的大小和数量随水热温度的升高而增加,并得到了不同含氮量的掺氮石墨烯。其中N元素以吡啶氮、吡咯氮和石墨氮3种形式存在并掺杂到石墨烯晶格中,温度升高,不利于吡咯氮的生成,吡啶氮和吡咯氮逐渐转化为更稳定的石墨氮。这种含氮基团键合类型随温度的变化过程表明,氮原子逐渐整合进入石墨烯晶格内部。在6mol/L KOH电解液中,180℃下水热反应得到的掺氮石墨烯在10mA/g电流密度下的比电容可达187.6F/g,性能最优。 | 李子庆 赫文秀 张永强 于慧颖 李兴盛 刘斌 | 2018 | 化工新型材料2018，46，8： | 0 |
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