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Fluorine‐Induced Surface Metallization for Ammonia Synthesis under Photoexcitation up to 1550 nm
Author(s) -
Fu Rong,
Wu Zewen,
Pan Ziye,
Gao Zhuoyang,
Li Zhen,
Kong Xianghua,
Li Lu
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202100572
Subject(s) - photoexcitation , work function , materials science , electron , band bending , ohmic contact , irradiation , metal , photochemistry , atomic physics , chemistry , nanotechnology , optoelectronics , excited state , physics , quantum mechanics , nuclear physics , metallurgy , layer (electronics)
The first observation of surface metallization of TiO 2− x induced by fluoride ions is presented. The emerging metallic states are contributed by the 3d orbital of surface Ti and the 2p orbital of surface bridging F, which are intrinsically originated from the strong electron repulsion between F − and adjacent Ti 3+ . The metalized TiO 2− x with reduced work function and downward band bending possesses high electron‐donating power to supported Ru species via atomic‐scale ohmic contacts, exhibiting unprecedented photocatalytic performances for ammonia synthesis across the entire solar spectrum region (200–1550 nm) at room temperature. Mechanism and kinetic analysis revealed that the loaded Ru could behave as efficient electron sinks to accumulate photogenerated electrons and that the metallic surface markedly enhanced the dissociation of H 2 and N 2 by the hot electrons generated by the visible or even infrared light irradiation.