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Manipulating spin polarization of titanium dioxide for efficient photocatalysis.


ABSTRACT: Photocatalysis has been regarded as a promising strategy for hydrogen production and high-value-added chemicals synthesis, in which the activity of photocatalyst depends significantly on their electronic structures, however the effect of electron spin polarization has been rarely considered. Here we report a controllable method to manipulate its electron spin polarization by tuning the concentration of Ti vacancies. The characterizations confirm the emergence of spatial spin polarization among Ti-defected TiO2, which promotes the efficiency of charge separation and surface reaction via the parallel alignment of electron spin orientation. Specifically, Ti0.936O2, possessing intensive spin polarization, performs 20-fold increased photocatalytic hydrogen evolution and 8-fold increased phenol photodegradation rates, compared with stoichiometric TiO2. Notably, we further observed the positive effect of external magnetic fields on photocatalytic activity of spin-polarized TiO2, attributed to the enhanced electron-spin parallel alignment. This work may create the opportunity for tailoring the spin-dependent electronic structures in metal oxides.

SUBMITTER: Pan L 

PROVIDER: S-EPMC6972883 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Manipulating spin polarization of titanium dioxide for efficient photocatalysis.

Pan Lun L   Ai Minhua M   Huang Chenyu C   Yin Li L   Liu Xiang X   Zhang Rongrong R   Wang Songbo S   Jiang Zheng Z   Zhang Xiangwen X   Zou Ji-Jun JJ   Mi Wenbo W  

Nature communications 20200121 1


Photocatalysis has been regarded as a promising strategy for hydrogen production and high-value-added chemicals synthesis, in which the activity of photocatalyst depends significantly on their electronic structures, however the effect of electron spin polarization has been rarely considered. Here we report a controllable method to manipulate its electron spin polarization by tuning the concentration of Ti vacancies. The characterizations confirm the emergence of spatial spin polarization among T  ...[more]

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