材料科学
化学工程
无定形固体
掺杂剂
析氧
吸附
氧气
催化作用
图层(电子)
无机化学
兴奋剂
纳米技术
化学
结晶学
物理化学
电极
有机化学
电化学
工程类
光电子学
作者
Bingying Cheng,Ke Kong,Linjie Zhang,Rongjian Sa,Tengteng Gu,Yuan Rui,Ruihu Wang
标识
DOI:10.1016/j.cej.2022.136122
摘要
Developing high-performance and low-cost oxygen evolution reaction (OER) electrocatalysts is critical for implementing industrial H2 production. Herein, ultrathin Fe-Mn-O hetero-nanosheets consisting of crystalline ε-Fe2O3 intercalated in amorphous Fe-doped δ-MnO2 have been fabricated through facile alkali hydrolysis of FeMn-based coordination polymer. Abundant Mn3+ active sites and oxygen vacancies are generated in Fe-doped δ-MnO2 layer due to in-layer/interlayer reformations, where interstitial ε-Fe2O3 is engineered to reinforce stability and conductivity. The optimal 0.5Fe-Mn-O nanosheets exhibit superb activity with low overpotentials of 258 (322) mV at 10 (300) mA cm−2 for OER together with strong stability under large current density over 100 h, ranking it among the best MnO2-based electrocatalysts. Importantly, in situ interlayer reconstruction from ε-Fe2O3 to β-FeOOH during OER has been unveiled, the evolved β-FeOOH triggers strong interfacial electronic coupling, which synergizes with oxygen vacancies and Fe3+ dopants to modulate surface electronic structure of δ-MnO2 for intermediates adsorption.
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