尖晶石
过电位
析氧
氧气
兴奋剂
密度泛函理论
材料科学
八面体
锰
无机化学
结晶学
化学
计算化学
物理化学
晶体结构
冶金
电化学
光电子学
电极
有机化学
作者
Hongyu Zhao,Liu Zhu,Jie Yin,Jing Jin,Xin Du,Lei Tan,Yong Peng,Pinxian Xi,Chun‐Hua Yan
标识
DOI:10.1002/anie.202402171
摘要
Abstract Design the electrocatalysts without noble metal is still a challenge for oxygen evolution reaction (OER) in acid media. Herein, we reported the manganese (Mn) doping method to decrease the concentration of oxygen vacancy (V O ) and form the Mn−O structure adjacent octahedral sites in spinel NiCo 2 O 4‐δ (NiMn 1.5 Co 3 O 4‐δ ), which highly enhanced the activity and stability of spinel NiCo 2 O 4‐δ with a low overpotential ( η ) of 280 mV at j =10 mA cm −2 and long‐term stability of 80 h in acid media. The isotopic labelling experiment based on differential electrochemical mass spectrometry (DEMS) clearly demonstrated the lattice oxygen in NiMn 1.5 Co 3 O 4‐δ is more stable due to strong Mn−O bond and shows synergetic adsorbate evolution mechanism (SAEM) for acid OER. Density functional theory (DFT) calculations reveal highly increased oxygen vacancy formation energy (E VO ) of NiCo 2 O 4‐δ after Mn doping. More importantly, the highly hydrogen bonding between Mn−O and *OOH adsorbed on adjacent Co octahedral sites promote the formation of *OO from *OOH due to the greatly enhanced charge density of O in Mn substituted sites.
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