期刊
SMALL
卷 16, 期 44, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202003361
关键词
charge separation; cocatalysts; ferroelectrics; photocatalytic water oxidation; spontaneous polarization field
类别
资金
- National Key R&D Program of China [2017YFA0204804]
- National Natural Science Foundation of China [61974147]
Exploiting spontaneous polarization of ferroelectric materials to achieve high charge separation efficiency is an intriguing but challenging research topic in solar energy conversion. This work shows that loading high work function RuO(2)cocatalyst on BiFeO3(BFO) nanoparticles enhances the intrinsic ferroelectric polarization by efficient screening of charges to RuO(2)via RuO2/BFO heterojunction. This leads to enhancement of the surface photovoltage of RuO2/BFO single nanoparticles nearly 3 times, the driving force for charge separation and transfer in photocatalytic reactions. Consequently, efficient photocatalytic water oxidation is achieved with quantum efficiency as high as 5.36 % at 560 nm, the highest activity reported so far for ferroelectric materials. This work demonstrates that, unlike low photocurrent density in film-based ferroelectric devices, high photocatalytic activity could be achieved by regulating the ferroelectric spontaneous polarization using appropriate cocatalyst to enhance driving force for efficient separation and transfer of photogenerated charges in particulate ferroelectric semiconductor materials.
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