析氧
尖晶石
材料科学
钙钛矿(结构)
掺杂剂
纳米复合材料
兴奋剂
相(物质)
化学工程
无机化学
纳米技术
化学
物理化学
冶金
电化学
光电子学
电极
有机化学
工程类
作者
Heng Liu,Wei Yuan,Pengfei Tan,Egon Campos dos Santos,Stuart M. Holmes,Hao Li,Jun Pan,Carmine D’Agostino
出处
期刊:Small
[Wiley]
日期:2023-12-18
标识
DOI:10.1002/smll.202308948
摘要
Perovskite and spinel oxides are promising alternatives to noble metal-based electrocatalysts for oxygen evolution reaction (OER). Herein, a novel perovskite/spinel nanocomposite comprised of SrCo0.4 Fe0.6 O3 and CoFe2 O4 (SCF/CF) is prepared through a simple one-step method that incorporates iron doping into a SrCoO3-δ matrix, circumventing complex fabrication processes typical of these materials. At a Fe dopant content of 60%, the CoFe2 O4 spinel phase is directly precipitated from the parent SrCo0.4 Fe0.6 O3 perovskite phase and the number of active B-site metals (Co/Fe) in the parent SCF can be maximized. This nanocomposite exhibits a remarkable OER activity in alkaline media with a small overpotentional of 294 mV at 10 mA cm-2 . According to surface states analysis, the parent SCF perovskite remains in its pristine form under alkaline OER conditions, serving as a stable substrate, while the second spinel CF is covered by 5/8 monolayer (ML) O*, exhibiting considerable affinity toward the oxygen species involved in the OER. Analysis based on advanced OER microkinetic volcano model indicates that a 5/8 ML O* covered-CF is the origin for the remarkable activity of this nanocomposite. The results reported here significantly advance knowledge in OER and can boost application, scale-up and commercialisation of electrocatalytic technologies toward clean energy devices.
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