Lianbang WANG
材料科学技术（英文）
Fuel cell using borohydride as the fuel has received much attention. AB5-type hydrogen storage alloy used as the anodic material instead of noble metals has been investigated. In order to restrain the generation of hydrogen and enhance the utilization of borohydride, Ti/Zr metal powders has been added into the parent LmNi4.78Mn0.22 (where Lm is La-richened mischmetal) alloy (LNM) by ball milling and heat treatment methods. It is found that the addition of Ti/Zr metal powders lowers the electrochemical catalytic activity of the electrodes, at the same time, restrains the generation of hydrogen and enhances the utilization of the fuel. All the results show that the hydrogen generation rate or the utilization of the fuel is directly relative to the electrochemical catalytic activity or the discharge capability of the electrodes. The utilization of the fuel increases with discharge current density. It is very important to find a balance between the discharge capability and the utilization of the fuel.
关键词:
Fuel cell
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null
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null
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null
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null
Hong Su Bing Zhang Lijuan Chen
材料科学技术（英文）
Platinum supported on carbon nanotubes (CNTs) with different tube diameters <10, 10-20, 40-60 and 60-100 nm were prepared. The catalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD). The metal particle size for 40 wt pct Pt catalysts were 2-5 nm. Self-prepared Pt/CNTs catalysts and purchased Pt/XC-72 were studied by polarization curves, and it was found that in the H2/O2 fuel cell system, Pt supported on Vulcan XC-72 (Pt/XC-72) possessed higher catalytic activity than Pt/CNTs. But in H2/air system, Pt supported on CNTs with diameter 10-20 nm (Pt/CNT1020) possessed higher activity than other Pt/C catalysts.
关键词:
Fuel cell
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碳载铂催化剂
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碳纳米管
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催化活性
Lianbang Wang Guobin Wu Zhenzhen Yang Yunfang Gao Xinbiao Mao Chun'an May
材料科学技术（英文）
Fuel cells using borohydride as the fuel have received much attention because of high energy density and theoretical working potential. In this work, LaNi4.5Al0.5 hydrogen storage alloy used as the anodic material has been investigated. It was found that the increasing operation temperature was helpful to the open-circuit potential, the discharge potential and the power density, but showed a negative effect on the utilization of the fuel due to the accelerated hydrogen evolution. The high KOH concentration was favorable for high-rate discharge capability. The adsorption and transformation of hydrogen on LaNi4.5Al0.5 alloy electrode has been observed, but its contribution to the discharge capability during a high-rate discharge was small.
关键词:
Fuel cell
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硼氢化物
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阳极催化剂
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储氢合金
Lianbang Wang Guobin Wu Zhenzhen Yang Yunfang Gao Xinbiao Mao Chun'an May
材料科学技术（英文）
Fuel cells using borohydride as the fuel have received much attention because of high energy density and theoretical working potential. In this work, LaNi4.5Al0.5 hydrogen storage alloy used as the anodic material has been investigated. It was found that the increasing operation temperature was helpful to the open-circuit potential, the discharge potential and the power density, but showed a negative effect on the utilization of the fuel due to the accelerated hydrogen evolution. The high KOH concentration was favorable for high-rate discharge capability. The adsorption and transformation of hydrogen on LaNi4.5Al0.5 alloy electrode has been observed, but its contribution to the discharge capability during a high-rate discharge was small.
关键词:
Fuel cell
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硼氢化物
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阳极催化剂
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储氢合金
宋微
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俞红梅
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邵志刚
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衣宝廉
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林瑾
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刘娜
催化学报
doi:10.1016/S1872-2067(14)60014-0
通过在不同真空度下进行碳纸的聚四氟乙烯(PTFE)浸渍处理，考察了PTFE在碳纸中的分布对燃料电池水淹情况的影响。碳纸PTFE浸渍过程中，抽真空作用可以将碳纸微孔中存留的空气移除，使PTFE更均匀地扩散到内部微孔中。碳纸的断面电镜照片显示真空浸渍可以改善PTFE的分布。在总浸渍量相同时，由于真空浸渍使更多的PTFE进入到碳纸内部微孔，故其表面的PTFE比例减少。实验进一步考察了碳纸中亲水孔和憎水孔的分布，结果表明真空浸渍处理的碳纸具有更高比例的憎水孔。将不同处理方法的碳纸制备成膜电极，通过全尺寸电池考察其性能，结果表明PTFE的均匀分布可以改善电池性能，并且电化学阻抗分析表明其有利于改善水淹问题。
关键词:
燃料电池
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气体扩散层
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憎水性
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水淹
马延文
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刘忠儒
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王博琳
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朱磊
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杨建平
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李兴鳌
新型炭材料
doi:10.1016/S1872-5805(12)60016-X
采用微波-乙二醇方法还原氧化石墨烯和Pt(v)、Co(Ⅱ)粒子混合物,再经300℃H2还原,制备了石墨烯负载Pt-Co合金催化剂(Pt-Co/G).利用透射电镜、X-射线能谱、X-射线衍射和光电子能谱对所制催化剂进行表征.Pt-Co合金的粒径为3nm～8 nm,均匀地分散在石墨烯片上.与单金属的Pt/G和商品化的Pt/C催化剂相比,所制合金化的Pt-Co/G催化剂对氧还原反应展现出高的催化活性和可比拟的稳定性,显示了其在燃料电池中的应用潜力.
关键词:
石墨烯
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Pt-Co合金纳米粒子
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氧化还原反应
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燃料电池
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电催化剂
唐水花
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林文锋
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催化学报
doi:10.1016/S1872-2067(11)60480-4
采用半池考察了Pt/C催化剂在含不同浓度甲醇的0.5 mol/L硫酸中的氧还原活性(ORR).研究发现,当甲醇浓度为0.1 mol/L时,Pt/C催化剂的ORR活性最高,在催化层上热压商品Nafion NRE-212膜后也出现同样趋势.线性扫描伏安曲线显示,压膜前后的Pt/C催化剂的ORR活性在含0.1 mol/L甲醇的0.5 mol/L硫酸中几乎没有变化.电化学阻抗谱结果表明,在该溶液中,Nafion膜的电阻比在其它电解液中低,这可能是导致Pt/C催化剂ORR活性提高的主要原因.有必要关注Nafion膜的这一异常性质并通过特殊设计后用于电池堆,以提高燃料电池性能.
关键词:
铂
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炭
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甲醇渗透
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氧还原
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燃料电池
