CN113328112A - 用于聚合物电解质膜燃料电池气体扩散层的基体材料 - Google Patents
用于聚合物电解质膜燃料电池气体扩散层的基体材料 Download PDFInfo
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Abstract
本发明提供了一种用于聚合物电解质膜燃料电池气体扩散层的基体材料,由六边形的小室相互连接的三维多孔且呈带状,六条边的肋条由两层金属层构成,从内向外是金属镍‑‑‑金属镍和钨的合金,每平方米材料中金属的总质量为:1500~3000克,材料中金属镍的质量含量为88~92%,金属钨的质量含量为8~12%,其余为杂质;基体材料的厚度0.1~0.2mm,比表面积为(1~2)×105㎡/m3;纵向透气率≥2000m/mm/(cm2hmmAq),纵向导热系数≥1.7W/(m·k),横向导热系数≥21W/(m·k)。本发明的这种多孔镍钨金属材料作为气体扩散层的基体材料,较碳纸,具有电阻小且强度高的优势,且具有高比表面积,导热性能和气体透过率性能优异;采用本发明的基体材料制备的气体扩散层可有效对抗因电化学反应对扩散层带来的电化学腐蚀,且具有较优的抗氧化性能。
Description
技术领域
本发明涉及一种用于聚合物电解质膜燃料电池的材料,特别涉及一种用于聚合物电解质膜燃料电池气体扩散层的基体材料。
背景技术
聚合物电解质膜燃料电池气体扩散层的基体材料普遍采用碳纤维纸或碳纤维布,而碳纤维布和碳纤维纸的特点是轻和孔隙率大,主要被日本东丽、加拿大巴拉德等厂商垄断。但是碳纤维纸、碳纤维布导热性、电阻、强度等性能仍不能满足聚合物电解质膜燃料电池性能不断提高要求,需要寻求一种适合材料来替代碳纤维纸或碳纤维布。
发明内容
本发明旨在提供一种可显著改善导热性和强度性能的聚合物电解质膜燃料电池气体扩散层的基体材料。本发明通过以下方案实现:
一种用于聚合物电解质膜燃料电池气体扩散层的基体材料,由六边形的小室相互连接的三维多孔且呈带状,六条边的肋条由两层金属层构成,从内向外是金属镍---金属镍和钨的合金,每平方米材料中金属的总质量为:1500-3000克,材料中金属镍的质量含量为88~92%,金属钨的质量含量为8~12%,其余为杂质;基体材料的厚度0.1~0.2mm,比表面积为(1~2)×105㎡/m3;0<材料的纵向电阻率≤55mΩ·cm,0<材料的压片电阻率≤4mΩ·cm,0<材料的接触式电阻≤5mΩ·cm;材料的拉伸强度≥25Mpa。
所述基体材料的纵向透气率≥2000m/mm/(cm2hmmAq),纵向导热系数≥1.7W/(m·k),横向导热系数≥21W/(m·k)。所谓纵向是指与带状材料表面垂直的方向,横向是指与与带状材料表面平行的方向。
将材料作为正极,甘汞电极作为负极,以氯化钠水溶液为电解液,使用1.45V外加电位处理75h,材料的重量损失率≤5%。
将材料置于4%的H2O2中浸泡160h再经干燥达到恒重后,材料的重量损失率≤5%。
基体材料的制备方法如下:首先将现有多孔镍带材碾压,再置于电镀镍液中,电镀镍可采用现有技术中的瓦特电镀镍液等,以该多孔镍带材为阳极、镍金属为阴极进行电解处理10~60min,其中电镀镍液的温度为30℃,电镀电流密度为10~30A/m2;之后再将经上述电解处理的多孔镍带材于带有还原气氛的800~1000℃环境中热处理一定时间,此时间的依据为每平方米材料处理10~20分钟,经热处理后的多孔镍带材采用现有的复合电镀钨工艺电镀覆钨,之后,再于带有还原气氛的800~1000℃环境中热处理一定时间,此时间的依据为每平方米材料处理10~60分钟,最后再经热处理后的多孔镍钨金属带材碾压至0.1~0.2mm。
一种用于聚合物电解质膜燃料电池气体扩散层,在上述的基体材料的一面覆盖有包含碳粉的微孔层。使用上述基体材料替换现有技术中的碳纸,采用现有的气体扩散层的制备工艺,可制得这种用于聚合物电解质膜燃料电池气体扩散层。
与现有技术相比,本发明的优点在于:
1、本发明的这种多孔镍钨金属材料作为气体扩散层的基体材料,较碳纸,具有电阻小且强度高的优势。
2、本发明的这种多孔镍钨金属材料孔隙率可达75%以上,具有高比表面积,导热性能和气体透过率性能优异,适合用于作为气体扩散层的基体材料。
3、本发明的这种多孔镍钨金属材料,其金属镍和金属钨的含量以及具有的金属分两层的这种内部结构,使得材料具有较佳的抗电腐蚀性能,在用于制备成气体扩散层后,由于扩散层与燃料电池的电极紧密相接,可有效对抗因电化学反应对扩散层带来的电化学腐蚀。
4、由于气体扩散层主要用于氢气和氧气的通过,在燃料电池的使用过程中,为延长使用寿命,也需要气体扩散层具有良好的抗氧化性能,本发明的这种特定金属镍和金属钨的含量以及具有的金属分层的这种内部结构的基体材料也具备较优的抗氧化性能。
附图说明
图1实施例2材料的扫描电镜图
具体实施方式
实施例1
首先将厚度为1.0mm的每平方米金属镍为2650克的多孔镍带材碾压至0.5mm,之后将其置于瓦特电镀镍液中,以该多孔镍带材为阳极、镍金属为阴极进行电解处理35min,其中电镀镍液的温度为30℃,电镀电流密度为30A/m2;之后再将经上述电解处理的多孔镍带材于带有还原气氛的800~1000℃环境中热处理一定时间,此时间的依据为每平方米材料处理15分钟,经热处理后的多孔镍带材,置于如下复合电镀钨液中电镀时间为15min;再于带有还原气氛的900℃环境中热处理一定时间,此时间的依据为每平米材料处理40分钟;最后再经热处理后的多孔镍钨金属带材碾压至0.1mm。上述采用的复合电镀钨液为:钨酸钠的浓度为80g/L,柠檬酸三胺的浓度为30g/L,硫酸镍的浓度为50g/L,电镀钨液的pH值控制为6.5,温度为55℃,电镀电流密度为25A/dm2。
实施例2
采用实施例1方法制备得到一种用于聚合物电解质膜燃料电池气体扩散层的基体材料,扫描电镜如图1所示,由六边形的小室1相互连接的三维多孔且呈带状,六条边的肋条2由两层金属层构成,从内向外是金属镍---金属镍和钨的合金。每平方米材料中金属的总质量为:1670克,材料中金属镍的质量含量为89%,金属钨的质量含量为10.5%,其余为杂质;基体材料的厚度0.1mm,比表面积为1.5×105㎡/m3;材料的孔隙率为82%,纵向透气率2300m/mm/(cm2hmmAq),纵向电阻率为30mΩ·cm,压片电阻率为2.1mΩ·cm,接触式电阻率为3mΩ·cm;材料的拉伸强度为75Mpa;材料的纵向导热系数为1.95W/(m·k),横向导热系数为23W/(m·k)。将上述材料作为正极,甘汞电极作为负极,以氯化钠水溶液为电解液,使用1.45V外加电位处理75h,材料的重量损失率为3.5%。将材料置于4%的H2O2中浸泡160h再经干燥达到恒重后,材料的重量损失率为3.85%。
实施例3
首先将厚度为1.0mm的每平方米金属镍为2400克的多孔镍带材碾压至0.5mm,之后将其置于瓦特电镀镍液中,以该多孔镍带材为阳极、镍金属为阴极进行电解处理45min,其中电镀镍液的温度为30℃,电镀电流密度为25A/m2;之后再将经上述电解处理的多孔镍带材于带有还原气氛的800℃环境中热处理一定时间,此时间的依据为每平方米材料处理55分钟,经热处理后的多孔镍带材,置于如下电镀钨液中电镀时间为10min;再于带有还原气氛的1000℃环境中热处理一定时间,此时间的依据为每平米材料处理10分钟;最后再经热处理后的多孔镍钨金属带材碾压至0.1mm。上述采用的电镀钨液为:钨酸钠的浓度为80g/L,柠檬酸三胺的浓度为30g/L,电镀钨液的pH值控制为6.5,温度为55℃,电镀电流密度为20A/dm2。
实施例4
采用实施例3方法制备得到一种用于聚合物电解质膜燃料电池气体扩散层的基体材料,扫描电镜如图1所示,由六边形的小室1相互连接的三维多孔且呈带状,六条边的肋条2由两层金属层构成,从内向外是金属镍---金属镍和钨的合金。每平方米材料中金属的总质量为:2270克,材料中金属镍的质量含量为91%,金属钨的质量含量为8.9%,其余为杂质;基体材料的厚度0.2mm,比表面积为1.87×105㎡/m3;材料的孔隙率为85%,纵向透气率2480m/mm/(cm2hmmAq),纵向电阻率为36mΩ·cm,压片电阻率为3.1mΩ·cm,接触式电阻率为3.6mΩ·cm,材料的拉伸强度为65Mpa;材料的纵向导热系数为2.1W/(m·k),横向导热系数为25W/(m·k)。将上述材料作为正极,甘汞电极作为负极,以氯化钠水溶液为电解液,使用1.45V外加电位处理75h,材料的重量损失率为4%。将材料置于4%的H2O2中浸泡160h再经干燥达到恒重后,材料的重量损失率为3.2%。
Claims (5)
1.一种用于聚合物电解质膜燃料电池气体扩散层的基体材料,其特征在于:由六边形的小室相互连接的三维多孔且呈带状,六条边的肋条由两层金属层构成,从内向外分别是金属镍---金属镍和钨的合金,每平方米材料中金属的总质量为:1500~3000克,其中金属镍的质量含量为88~92%,金属钨的质量含量为8~12%,其余为杂质;基体材料的厚度0.1~0.2mm,比表面积为(1~2)×105㎡/m3;0<材料的纵向电阻率≤55mΩ·cm,0<材料的压片电阻率≤4mΩ·cm,0<材料的接触式电阻≤5mΩ·cm;材料的拉伸强度≥25Mpa。
2.如权利要求1所述的用于聚合物电解质膜燃料电池气体扩散层的基体材料,其特征在于:材料的纵向透气率≥2000m/mm/(cm2hmmAq),纵向导热系数≥1.7W/(m·k),横向导热系数≥21W/(m·k)。
3.如权利要求1或2所述的用于聚合物电解质膜燃料电池气体扩散层的基体材料,其特征在于:将材料作为正极,甘汞电极作为负极,以氯化钠水溶液为电解液,使用1.45V外加电位处理75h,材料的重量损失率≤5%。
4.如权利要求1或2所述的用于聚合物电解质膜燃料电池气体扩散层的基体材料,其特征在于:将材料置于4%的H2O2中浸泡160h再经干燥达到恒重后,材料的重量损失率≤5%。
5.如权利要求3所述的用于聚合物电解质膜燃料电池气体扩散层的基体材料,其特征在于:将材料置于4%的H2O2中浸泡160h再经干燥达到恒重后,材料的重量损失率≤5%。
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