塔菲尔方程
过电位
析氧
材料科学
异质结
电催化剂
电子转移
价(化学)
化学工程
纳米技术
光电子学
光化学
物理化学
电极
化学
电化学
工程类
有机化学
作者
Dai Taguchi,Xin Zhang,Mingzi Sun,Bolong Huang,Nan Zhang,Pengfei Da,Rui Yang,Zidong He,Wei Wang,Pinxian Xi,Chun‐Hua Yan
标识
DOI:10.1002/adma.202102593
摘要
Structural engineering and compositional controlling are extensively applied in rationally designing and fabricating advanced freestanding electrocatalysts. The key relationship between the spatial distribution of components and enhanced electrocatalysis performance still needs further elaborate elucidation. Here, CeO2 substrate supported CoS1.97 (CeO2 -CoS1.97 ) and CoS1.97 with CeO2 surface decorated (CoS1.97 -CeO2 ) materials are constructed to comprehensively investigate the origin of spatial architectures for the oxygen evolution reaction (OER). CeO2 -CoS1.97 exhibits a low overpotential of 264 mV at 10 mA cm-2 due to the stable heterostructure and faster mass transfer. Meanwhile, CoS1.97 -CeO2 has a smaller Tafel slope of 49 mV dec-1 through enhanced adsorption of OH- , fast electron transfer, and in situ formation of Co(IV)O2 species under the OER condition. Furthermore, operando spectroscopic characterizations combined with theoretical calculations demonstrate that spatial architectures play a distinguished role in modulating the electronic structure and promoting the reconstruction from sulfide to oxyhydroxide toward higher chemical valence. The findings highlight spatial architectures and surface reconstruction in designing advanced electrocatalytic materials.
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