Advanced Energy Materials Design Lab., School of Chemical Engineering, Yeungnam University, 38541 Gyeongsan, Republic of Korea.
Nanotechnology. 2019 Feb 22;30(8):085402. doi: 10.1088/1361-6528/aaf48c. Epub 2018 Nov 28.
In this study, the degradation of different cathode carbon supports is investigated in proton exchange membrane fuel cells (PEMFCs). A platinum catalyst is synthesized using various carbon supports, such as Vulcan XC-72, graphite nanopowder and carbon nanotube, which are evaluated based on the fabrication of membrane electrode assemblies. During the startup and shutdown of PEMFCs, the individual electrode potential can be measured in situ using a dynamic hydrogen electrode. The cathode potential increases instantaneously to 1.4 V in one attempt, when H/air boundaries are developed on the anode side during the fuel starvation, leading to significant carbon corrosion. The corrosion rates of various carbon supports are calculated from the concentration of gases, such as CO, CO and SO, emitted from the cathode outlet, measured directly in situ by Fourier transform infrared gas analysis. The carbon nanotube-supported Pt catalyst shows the best performance against carbon corrosion during fuel starvation, compared to commercial Pt/C catalyst and other types of carbon supports.
本研究考察了质子交换膜燃料电池（PEMFC）中不同阴极碳载体的降解情况。使用不同的碳载体，如 Vulcan XC-72、石墨纳米粉末和碳纳米管，合成了铂催化剂，并基于膜电极组件的制备对其进行了评估。在 PEMFC 的启动和关闭过程中，可以使用动态氢电极原位测量单个电极电势。在燃料短缺期间，阳极侧形成 H/空气边界时，阴极电势会在一次尝试中瞬间增加到 1.4V，导致严重的碳腐蚀。通过傅里叶变换红外气体分析直接原位测量从阴极出口排出的 CO、CO 和 SO 等气体的浓度，计算出各种碳载体的腐蚀速率。与商业 Pt/C 催化剂和其他类型的碳载体相比，在燃料短缺期间，碳纳米管负载的 Pt 催化剂表现出对碳腐蚀的最佳抵抗力。
