燃料电池多孔电极的电化学刻蚀处理及性能  

Electrochemical etching and performance study of gas diffusion electrode for fuel cell application

作　　者：邓若燚 夏章讯[1] 孙瑞利 王素力[1] 孙公权[1] DENG Ruo-yi;XIA Zhang-xun;SUN Rui-li;WANG Su-li;SUN Gong-quan(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian Liaoning 116023,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《电源技术》2020年第2期196-199,248,共5页Chinese Journal of Power Sources

基　　金：国家自然科学基金(21503228);中国科学院战略性先导科技专项(XDA21000000)

摘　　要：采用电化学阴极刻蚀的方法对磁控溅射制备的铂气体扩散电极进行处理,考察了不同刻蚀电势和时间所制备样品的电化学行为。结果表明,与未刻蚀的电极相比,刻蚀后的电极电化学活性面积(ECSA)提高16.6%,氧还原半波电位正移15~20 mV,质量比活性(MA)和面积比活性(SA)分别提高27.2%和48.4%。X射线衍射光谱法(XRD)、透射电子显微镜法(TEM)等物性表征表明刻蚀后的电极中铂的晶型并未改变,但其分散性和颗粒形状有所变化,推测为电极电化学活性面积提高,因此提高了电极氧还原性能。Electrochemical cathodic etching was used for platinum gas diffusion electrode prepared by prepared by magnetron sputtering. The electrochemical behavior of the samples prepared by different etching potentials and time was investigated. The results show that compared to untreated electrode, the electrochemical active surface area of the electrode after etching is increased by 16.6%, and the oxygen reduction half-wave potential is positively shifted by 15~20 mV. The MA and SA of the etched electrode are increased by 27.2% and 48.4%. The physical properties of XRD and TEM indicate that the crystal phase of platinum in the electrode isn’t changed. The dispersion and particle shape are changed, then the electrochemical active area is enhanced. And the oxygen reduction performance of the electrode is enhanced.

关 键 词：燃料电池 气体扩散电极 电化学刻蚀 

分 类 号：TM911[电气工程—电力电子与电力传动]