title: Spatial location engineering of oxygen vacancies for optimized photocatalytic H2 evolution activity.
abstract: Enhanced H2 evolution efficiency is achieved via manipulating the spatial location of oxygen vacancies in niobates. The ultrathin K4 Nb6O17 nanosheets which are rich in surface oxygen vacancies show enhanced optical absorption and band gap narrowing. Meanwhile, the fast charge separation effectively reduces the probability of hole-electron recombination, enabling 20 times hydrogen evolution rate compared with the defect-free bulk counterpart.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Wentuan
authors.initials: W
authors.lastname: Bi
authors.forename: Chunmiao
authors.initials: C
authors.lastname: Ye
authors.forename: Chong
authors.initials: C
authors.lastname: Xiao
authors.forename: Wei
authors.initials: W
authors.lastname: Tong
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Shao
authors.forename: Yi
authors.initials: Y
authors.lastname: Xie
keywords: H2 evolution; K4Nb6O17 nanosheets; oxygen vacancies; structure-activity relationships; surface analysis