多金属氧酸盐
位阻效应
Atom(片上系统)
调制(音乐)
化学
纳米技术
材料科学
结晶学
催化作用
立体化学
物理
工程类
有机化学
声学
嵌入式系统
作者
Yiming Wu,Shuwen Niu,Zihan Wei,Meng Li,Wei Wei
摘要
Single-atom catalysts (SACs) with nitrogen-coordinated transition metal sites (M-Nx) hold great promise for electrocatalytic oxygen reduction and oxygen evolution reactions. Despite substantial achievements based on the confinement pyrolysis and heteroatom-doping methods, the M-Nx SACs still suffer from low yield of atomic sites and less tenability of electronic states of M-Nx center. Here, an innovate synthesis methodology is proposed for surface integrating Co atoms onto polyoxometalate (POM) and its derivative clusters, which promise to regulate the atomic distribution and coordination environments of Co-Nx SACs at the sub-nanometer level. The synthetic procedures exhibit general applicability for a variety of POM clusters to achieve high atomic Co loading up to 9.9 wt%. Steric integration by POM-derived clusters also impart strengthened d-p orbital hybridization of Co-Nx SACs by the formation of Co-N-Mo bonding, which surpass common heteroatoms toward modulating the geometric and electronic structures of M-Nx SACs, leading to pronounced catalytic activity and durability.
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