钙钛矿(结构)
材料科学
过渡金属
掺杂剂
催化作用
兴奋剂
氧气
氧化物
化学物理
金属
析氧
纳米颗粒
化学工程
无机化学
纳米技术
结晶学
物理化学
化学
冶金
光电子学
工程类
有机化学
生物化学
电化学
电极
作者
Oh Hun Kwon,Sivaprakash Sengodan,Kyeounghak Kim,Gihyeon Kim,Hu Young Jeong,Jeeyoung Shin,Young Wan Ju,Jeong Woo Han,Guntae Kim
摘要
Abstract In perovskites, exsolution of transition metals has been proposed as a smart catalyst design for energy applications. Although there exist transition metals with superior catalytic activity, they are limited by their ability to exsolve under a reducing environment. When a doping element is present in the perovskite, it is often observed that the surface segregation of the doping element is changed by oxygen vacancies. However, the mechanism of co-segregation of doping element with oxygen vacancies is still an open question. Here we report trends in the exsolution of transition metal (Mn, Co, Ni and Fe) on the PrBaMn 2 O 5+ δ layered perovskite oxide related to the co-segregation energy. Transmission electron microscopic observations show that easily reducible cations (Mn, Co and Ni) are exsolved from the perovskite depending on the transition metal-perovskite reducibility. In addition, using density functional calculations we reveal that co-segregation of B-site dopant and oxygen vacancies plays a central role in the exsolution.
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