Catalytic System Based on Sub‑2 nm Pt Particles and Its Extraordinary Activity and Durability for Oxygen Reduction
journal contributionposted on 17.07.2019 by Haoyan Cheng, Zhenming Cao, Zitao Chen, Ming Zhao, Minghao Xie, Zhiheng Lyu, Zhihong Zhu, Miaofang Chi, Younan Xia
Any type of content formally published in an academic journal, usually following a peer-review process.
Carbon-supported Pt nanoparticles are used as catalysts for a variety of reactions including the oxygen reduction reaction (ORR) key to proton-exchange membrane fuel cells, but their catalytic performance has long been plagued by detachment and sintering. Here we report the in situ growth of sub-2 nm Pt particles on a commercial carbon support via the galvanic reaction between a Pt(II) precursor and a uniform film of amorphous Se predeposited on the support. The residual Se could serve as a linker to strongly anchor the Pt nanoparticles to the carbon surface, leading to a catalytic system with extraordinary activity and durability toward ORR. Even after 20 000 cycles of accelerated durability test, the sub-2 nm Pt particles were still dispersed well on the carbon support and maintained a mass activity more than three-times as high as the pristine value of a commercial Pt/C catalyst.