[ACIE] 我室李剑锋教授发表论文:In situ Spectroscopic Insight into the Origin of the Enhanced Performance of Bimetallic nanocatalysts towards ORR

发布日期:2019年09月14日   浏览次数:

我室李剑锋教授在 ACIE 上发表论文:In situ Spectroscopic Insight into the Origin of the Enhanced Performance of Bimetallic nanocatalysts towards ORR

文章链接:https://onlinelibrary.wiley.com/doi/10.1002/anie.201908907

摘要:

It is vital to understand the oxygen reduction reaction (ORR) mechanism at the molecular level for the rational design and synthesis of high activity fuel cell catalysts. Surface enhanced Raman spectroscopy (SERS) is a powerful technique capable of detecting the bond vibrations of surface species in the low wavenumber range, however using it to probe practical nanocatalysts remains extremely challenging. Herein, shell‐isolated nanoparticle‐enhanced Raman spectroscopy (SHINERS) was used to investigate ORR processes on the surface of novel bimetallic Pt3Co nanocatlyst satellite structures. Direct spectroscopic evidence of *OOH suggests that ORR undergoes an associative mechanism on Pt3Co in both acidic and basic environments. Density functional theory (DFT) calculations show that the weak *O adsorption arises from electronic effect on the Pt3Co surface and accounts for enhanced ORR activity. This work shows SHINERS is a promising technique for the real‐time observation of catalytic processes.