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Regulation of Ferroelectric Polarization to Achieve Efficient Charge Separation and Transfer in Particulate RuO 2 /BiFeO 3 for High Photocatalytic Water Oxidation Activity
Author(s) -
Shah Jafar H.,
Huang Biaohong,
Idris Ahmed M.,
Liu Yong,
Malik Anum S.,
Hu Weijin,
Zhang Zhidong,
Han Hongxian,
Li Can
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202003361
Subject(s) - ferroelectricity , materials science , photocurrent , heterojunction , polarization (electrochemistry) , photocatalysis , semiconductor , optoelectronics , nanoparticle , charge carrier , energy conversion efficiency , nanotechnology , chemistry , catalysis , dielectric , biochemistry
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 BiFeO 3 (BFO) nanoparticles enhances the intrinsic ferroelectric polarization by efficient screening of charges to RuO 2 via RuO 2 /BFO heterojunction. This leads to enhancement of the surface photovoltage of RuO 2 /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.