质子交换膜燃料电池表面炭涂层改性复合双极板的电化学性能研究  

Durability improvement and corrosion resistance mechanism of surface carbon coated modified composite bipolar plate used in PEM fuel cell

作　　者：彭涛 欧阳涛 刘春轩 谢志勇[1] 高平平 曾凡浩 Peng Tao;Ouyang Tao;Liu Chun-xuan;Xie Zhi-yong;Gao Ping-ping;Zeng Fan-hao(State Key Laboratory of Powder Metallurgy,Central South University,Hunan Changsha 410083,China;Hunan Provincial Key Laboratory of Vehicle and Transmission System,Hunan Institute of Engineering,Hunan Xiangtan 411104,China;Hunan Gold Sky Aluminum Industry High-tech Co.,Ltd.,Hunan Changsha 416100,China)

机构地区：[1]中南大学粉末冶金研究院,湖南长沙410083 [2]湖南工程学院湖南省汽车动力与传动系统重点实验室,湖南湘潭411104 [3]湖南金天铝业高科技有限公司,湖南长沙416100

出　　处：《炭素技术》2021年第3期15-19,59,共6页Carbon Techniques

基　　金：国家重点研发项目(2018YFB1502504)。

摘　　要：以聚酰胺酸PAA为涂层的炭前驱体,通过热压成型和浸渍工艺制备了耐腐蚀的表面炭涂层改性复合双极板。该涂层表面平整,质地密实,能有效降低材料的孔隙率,1000℃处理的样品在模拟PEMFC工作环境中表现出相当低的腐蚀电流密度(Jcorr=0.07μA/cm^(2)),同时,恒电位极化测试表明,在阴极(0.6 V)和阳极(-0.1 V)的实际PEMFC工作条件下,稳定后的电流密度低于1μA/cm^(2)。这个过程中复合双极板的腐蚀行为受材料的孔隙率和表面缺陷的影响,致密炭涂层的掺入减少了复合双极板的孔隙率,同时,随着表面炭涂层结构缺陷的减少,复合双极板的耐腐蚀性提高。In this paper,PAA(polyamic acid)coatings were used as carbon precursors,and modified composite bipolar plate with corrosion resistant carbon coating surface was prepared by hot pressing and impregnation process.The coating surface has smooth surface and dense texture,which can effectively reduce the porosity of material.Results showed that the sample treated at 1000℃(PAA-1000)has relatively low corrosion current density(Jcorr=0.07μA/cm^(2))in the simulated PEMFC environments.Meanwhile,constant potential polarization tests showed that in the actual working condition,the stabilized current density of PAA-1000 reaches below 1μA/cm^(2).In this process,the corrosion behavior of composite bipolar plates is affected by the porosity and surface defects of the materials.The addition of dense carbon coating reduces the porosity of composite bipolar plates.At the same time,with the reduction of surface carbon coating structural defects,the corrosion resistance of composite bipolar plates increased.

关 键 词：复合双极板 炭涂层 孔隙率 耐腐蚀性 

分 类 号：TQ127.11[化学工程—无机化工] TM911.48[电气工程—电力电子与电力传动]