Platinum (Pt) nanoparticle catalysts remain the most popular cathode materials for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. Non-metallic alloying of Pt has become an emerging strategy to improve electrocatalytic performance, however, the electrocatalytic ORR mechanisms still need to be understood for further improvement toward practical application. Herein, a rapid microwave reduction method is employed for alloying phosphorous (P) into Pt to form a carbon supported phosphorus-alloyed Pt nanoparticle catalyst (P-Pt/C), which demonstrates the ability to replace commercial Pt/C. By a combination of density functional theory calculations and in-situ electrochemical Raman spectroscopy, the regulation role of P-alloying in the electrocatalytic mechanisms is revealed. It is found that the nearby Pt atoms can convert the ORR pathway from associative one to dissociative one, exhibiting a spontaneous dissociation of *OOH intermediate to *OH and *O species as well as a change of potential determining step to *O protonation. Furthermore, the strategy of large-scale economic synthesis of such alloying Pt-based catalyst is also established, demonstrated by a gram-level synthesis per batch. This study puts insight into the electrocatalytic ORR fundamentals of Pt-alloying with non-metals and provides a basis for the reasonable design and synthesis of efficient nonmetals-alloyed Pt catalysts.
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号