期刊
ADVANCED MATERIALS
卷 33, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202104623
关键词
brownmillerite; conductivity; layered oxides; protons; water vapor
类别
资金
- National Natural Science Foundation of China [11804145, 12004156]
- Science and Technology Research Items of Shenzhen [JCYJ20190809142603695, JCYJ20180504165650580, JCYJ20190809181601639]
- High-level Special Funding [G02206303, G02206403]
- Spanish Ministry of Science, Innovation, and Universities under the Ramon y Cajal fellowship [RYC2018-024947-I]
A new thermal hydration strategy was introduced for synthesizing conductive protonated oxides from 3d transition-metal oxides, resulting in high electronic conductivity and unique water uptake properties. This opens up opportunities for creating high-conductive protonated layered oxides through co-doping of protons and oxygen ions.
Protonated 3d transition-metal oxides often display low electronic conduction, which hampers their application in electric, magnetic, thermoelectric, and catalytic fields. Electronic conduction can be enhanced by co-inserting oxygen acceptors simultaneously. However, the currently used redox approaches hinder protons and oxygen ions co-insertion due to the selective switching issues. Here, a thermal hydration strategy for systematically exploring the synthesis of conductive protonated oxides from 3d transition-metal oxides is introduced. This strategy is illustrated by synthesizing a novel layered-oxide SrCoO3H from the brownmillerite SrCoO2.5. Compared to the insulating SrCoO2.5, SrCoO3H exhibits an unprecedented high electronic conductivity above room temperature, water uptake at 250 degrees C, and a thermoelectric power factor of up to 1.2 mW K-2 m(-1) at 300 K. These findings open up opportunities for creating high-conductive protonated layered oxides by protons and oxygen ions co-doping.
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