材料科学
原位
合金
氧化物
第四纪
纳米颗粒
化学工程
复合氧化物
纳米技术
冶金
有机化学
古生物学
化学
工程类
生物
作者
Luo Yao,Dong Zhang,Tong Liu,Chang Xu,Jietao Wang,Yao Wang,Xiang‐Kui Gu,Mingyue Ding
标识
DOI:10.1002/adfm.202403922
摘要
Abstract Reversible solid oxide cell is a promising energy storage and conversion device for CO 2 ‐CO mutual conversion, with simplified cell configuration and performance stability. One key technical challenge is the lack of catalytically active and carbon‐tolerant fuel electrodes. The other one is still a lack of the kinetics mechanism and the redox stability of the active interface. Herein, the findings of a fuel electrode composed of a Sr 2 Fe 1.0 Co 0.2 Ni 0.2 Cu 0.2 Mo 0.4 O 6‐δ medium‐entropy perovskite matrix decorated with in situ exsolved Fe‐Co‐Ni‐Cu quaternary alloy nanoparticles (QA@SFO) are reported. Under a reducing atmosphere, the exsolution of the quaternary alloy is accompanied by a structural transformation from double perovskite to layered perovskite, forming an interface structure where alloy nanoparticles are strongly pinned to the substrate with abundant oxygen vacancies. Electrochemically, the highly active sites provided by the QA@SFO interface greatly enhance the kinetics of CO 2 ‐CO mutual conversion and exhibit outstanding durability for over 300 h at 1.3 V and 800 °C. Moreover, first‐principles calculations and ab initio molecular dynamics simulations from the atomic scale further elucidate the impressive electrocatalytic activity and stability and reveal that Fe and Ni in exsolved nanoparticles enhance the electrocatalytic activity, and the strong binding of Co and Cu to the parent improves the interfacial stability.
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