Koushanpour Ashkan, Harvey Edward J, Merle Geraldine
Experimental Surgery, Faculty of Medicine, McGill University, Montreal H3A 0C5, Canada.
Department of Surgery, Faculty of Medicine, McGill University, Montreal H3A 0C5, Canada.
ACS Appl Mater Interfaces. 2022 May 4;14(17):19285-19294. doi: 10.1021/acsami.1c23484. Epub 2022 Apr 22.
This study examines the atomic confinement of commercial Pt/C electrocatalysts. While a high electrocatalytic activity for the oxygen reduction reaction is important for proton-exchange membrane fuel cell (PEMFC) performance, the high stability of the electrocatalyst is essential for real applications under harsh operating conditions. The demands necessitate the development of advanced electrocatalysts that are resistant to corrosion. A combination of diazonium chemistry with Cu electrodeposition permits the selective protection of the carbon surface of the commercial Pt/C to prevent corrosion while improving wettability and ionic transfer. The resulting electrocatalysts exhibit an exceptional ORR stability after accelerated stress testing (AST) with a 250% improvement in comparison with unprotected commercial Pt/C. This novel electrochemical pathway provides a much-needed boost to carbon-based catalytic supports, which still face several stability challenges in energy applications in a harsh environment.
本研究考察了商业Pt/C电催化剂的原子限域情况。虽然对于质子交换膜燃料电池（PEMFC）性能而言，氧还原反应的高电催化活性很重要，但电催化剂的高稳定性对于在苛刻操作条件下的实际应用至关重要。这些需求促使人们开发耐腐蚀的先进电催化剂。重氮化学与铜电沉积相结合，可以选择性地保护商业Pt/C的碳表面，防止腐蚀，同时改善润湿性和离子转移。经过加速应力测试（AST）后，所得电催化剂表现出优异的氧还原反应稳定性，与未保护的商业Pt/C相比提高了250%。这种新颖的电化学途径为碳基催化载体提供了急需的推动，而碳基催化载体在恶劣环境中的能源应用中仍面临若干稳定性挑战。
