期刊
ADVANCED MATERIALS
卷 31, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201900458
关键词
ionic liquid gating; phase transformation; protonation; spinel
类别
资金
- Basic Science Center program of NSFC [51788104]
- NSFC [2015CB921700, 2016YFA0301004]
- National Natural Science Foundation of China [51872155]
- Beijing Advanced Innovation Center for Future Chip (ICFC)
- US Department of Energy [DE-AC02-05CH11231]
Ionic-liquid-gating- (ILG-) induced proton evolution has emerged as a novel strategy to realize electron doping and manipulate the electronic and magnetic ground states in complex oxides. While the study of a wide range of systems (e.g., SrCoO2.5, VO2, WO3, etc.) has demonstrated important opportunities to incorporate protons through ILG, protonation remains a big challenge for many others. Furthermore, the mechanism of proton intercalation from the ionic liquid/solid interface to whole film has not yet been revealed. Here, with a model system of inverse spinel NiCo2O4, an increase in system temperature during ILG forms a single but effective method to efficiently achieve protonation. Moreover, the ILG induces a novel phase transformation in NiCo2O4 from ferrimagnetic metallic into antiferromagnetic insulating with protonation at elevated temperatures. This study shows that environmental temperature is an efficient tuning knob to manipulate ILG-induced ionic evolution.
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