Nickel-rich layered LiNi1−xMxO2 (M = Mn, Fe, and Co) electrocatalysts with high oxygen evolution reaction activity
作者： Veronica Augustyn , Soosairaj Therese , Travis C. Turner , Arumugam Manthiram
DOI: 10.1039/C5TA04637H
关键词: Hydrogen fuel 、 X-ray photoelectron spectroscopy 、 Oxygen evolution 、 Lithium 、 Nickel 、 Electrochemistry 、 Chemistry 、 Electrocatalyst 、 Inorganic chemistry 、 Catalysis
摘要: An understanding of the materials characteristics that lead to high electrocatalytic activity for oxygen evolution reaction (OER) is needed make electrolytic hydrogen fuel production and rechargeable metal-air batteries a reality. Here, first systematic investigation family Ni-rich layered LiNi1−xMxO2 (M = Mn, Fe, Co) oxides reveals catalytic can be tuned by varying Ni content, nature transition-metal dopant, lithium degree cation ordering between Li Ni/M. In particular, Fe-doping in imparts most dramatic improvements OER activity, possibly due flexibility Fe adopt different coordination geometries on surface. X-ray photoelectron spectroscopic (XPS) data reveal surface Fe-doped sample enriched with while ex situ Raman spectroscopy indicates morphology preserved during electrochemical cycling, but disorder increases. Among various compositions investigated, LiNi0.7Co0.3Fe0.2O2 exhibits highest which increases further when excess vacancies are present, good stability. The samples join growing number highly active iron-doped systems electrocatalysis alkaline conditions.
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