催化作用
材料科学
氧化物
烧结
化学工程
铂金
Atom(片上系统)
纳米技术
结晶学
复合材料
化学
冶金
有机化学
计算机科学
工程类
嵌入式系统
作者
Shuaiqi Zhao,Jianwen Lin,Peng Wu,Changchun Ye,Yifei Li,Anqi Li,Xiaojing Jin,Yun Zhao,Guangxu Chen,Yongcai Qiu,Daiqi Ye
标识
DOI:10.1021/acsami.1c14456
摘要
A catalyst with high-entropy oxide (HEO)-stabilized single-atom Pt can afford low-temperature activity for catalytic oxidation and remarkable durability even under harsh conditions. However, HEO is easy to harden during sintering, which results in a few defective sites for anchoring single-atom metals. Herein, we present a sol-gel-assisted mechanical milling strategy to achieve a single-atom catalyst of Pt-HEO/Al2O3. The strong interaction between HEO and Al2O3 effectively inhibits the growth of HEO microparticles, which leads to generation of more surface defects because of the nanoscale effect. Meanwhile, another strong interaction between Pt and HEO stabilizes single-atom Pt on HEO. Temperature-programmed techniques further verify that the reactivity of surface lattice oxygen species is enhanced because of the Pt-O-M bonds on the surface of HEO. Unlike conventional single-atom Pt catalysts, Pt-HEO/Al2O3 as a heterogeneous catalyst not only exhibits superior stability against hydrothermal aging but also presents long-term reaction stability for CO catalytic oxidation, which exceeds 540 h. The present work opens a new door for rational design of hydrothermally stable single-atom Pt catalysts, which are highly promising in practical applications.
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