Najafabadi Amin Taheri, Leeuwner Magrieta J, Wilkinson David P, Gyenge Előd L
Department of Chemical and Biological Engineering, Clean Energy Research Centre, University of British Columbia, 2360 East Mall, Vancouver, BC, V6T 1Z3, Canada.
ChemSusChem. 2016 Jul 7;9(13):1689-97. doi: 10.1002/cssc.201600351. Epub 2016 Jun 2.
The microporous layer (MPL) is a key cathodic component in proton exchange membrane fuel cells owing to its beneficial influence on two-phase mass transfer. However, its performance is highly dependent on material properties such as morphology, porous structure, and electrical resistance. To improve water management and performance, electrochemically exfoliated graphene (EGN) microsheets are considered as an alternative to the conventional carbon black (CB) MPLs. The EGN-based MPLs decrease the kinetic overpotential and the Ohmic potential loss, whereas the addition of CB to form a composite EGN+CB MPL improves the mass-transport limiting current density drastically. This is reflected by increases of approximately 30 and 70 % in peak power densities at 100 % relative humidity (RH) compared with those for CB- and EGN-only MPLs, respectively. The composite EGN+CB MPL also retains the superior performance at a cathode RH of 20 %, whereas the CB MPL shows significant performance loss.
微孔层（MPL）是质子交换膜燃料电池中的关键阴极组件，因为它对两相传质有有益影响。然而，其性能高度依赖于材料特性，如形态、多孔结构和电阻。为了改善水管理和性能，电化学剥离石墨烯（EGN）微片被视为传统炭黑（CB）MPL的替代品。基于EGN的MPL降低了动力学过电位和欧姆电位损失，而添加CB形成复合EGN+CB MPL则显著提高了传质极限电流密度。这分别体现在与仅使用CB和EGN的MPL相比，在100%相对湿度（RH）下峰值功率密度提高了约30%和70%。复合EGN+CB MPL在阴极RH为20%时也保持了优异性能，而CB MPL则表现出显著的性能损失。
