Lori Oran, Gonen Shmuel, Kapon Omree, Elbaz Lior
Department of Chemistry, Bar-Ilan University, Ramat-Gan 5290002, Israel.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):8315-8323. doi: 10.1021/acsami.0c20089. Epub 2021 Feb 15.
In an effort to develop durable, corrosion-resistant catalyst support materials for polymer electrolyte fuel cells, modified polymer-assisted deposition method was used to synthesize tungsten carbide (WC, WC), which was later used as a support material for Pt-based oxygen reduction reaction catalyst, as an alternative for the corrosion-susceptible, carbon supports. The Pt-deposited tungsten carbide's corrosion-resistance, oxygen reduction reaction electrocatalysis, and durability were studied and compared to that of Pt/C. Bulk free carbon was found to be absent from the ceramic matrix which had particle size in the range of 2-25 nm. Tungsten carbide support appears to enhance the oxygen reduction activity on Pt, showing an increase in mass activity (nearly 2-fold at 0.85 V vs RHE) and specific activity (more than 7 times higher), alongside decrease in overpotential, in comparison to Pt/C. A significant increase in durability was also observed with the tungsten carbide-based system.
为了开发用于聚合物电解质燃料电池的耐用、耐腐蚀催化剂载体材料，采用改进的聚合物辅助沉积法合成了碳化钨（WC、WC），后来将其用作基于铂的氧还原反应催化剂的载体材料，以替代易腐蚀的碳载体。研究了沉积铂的碳化钨的耐腐蚀性、氧还原反应电催化性能和耐久性，并与Pt/C进行了比较。发现陶瓷基体中不存在大量游离碳，其粒径在2-25nm范围内。与Pt/C相比，碳化钨载体似乎增强了铂上的氧还原活性，质量活性增加（在0.85V相对于可逆氢电极时几乎增加了两倍），比活性增加（高出7倍以上），同时过电位降低。基于碳化钨的体系的耐久性也有显著提高。
