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Cubic-like BaZrO3 nanocrystals with exposed {001}/{011} facets and tuned electronic band structure for enhanced photocatalytic hydrogen production

Author:
Meng, Jie, Lan, Zhenyun, Lin, Qingyun, Chen, Tao, Chen, Xing, Wei, Xiao, Lu, Yunhao, Li, Jixue, Zhang, Ze
Source:
Journal of materials science 2019 v.54 no.3 pp. 1967-1976
ISSN:
0022-2461
Subject:
engineering, hydrogen production, nanocrystals, photocatalysis, photocatalysts, surface area
Abstract:
Facet engineering to expose specific surfaces has received rapid growth attention to promote the photocatalytic performance. In this work, we reported that BaZrO₃ nanocrystals with {001}/{011} facets and corresponding higher reducing capacity could effectively improve the photocatalytic hydrogen evolution in pure water. The tuned electronic band structure arising from exposed specific {001}/{011} facets and the higher surface area are the main reasons to promote photocatalytic activity. The conduction band bottom for BaZrO₃ nanocrystals with {001}/{011} facets synthesized by solvothermal method (denoted as BZO-HT) is about 0.31 eV higher than that of sample prepared by hydrothermal reaction (denoted as BZO-H). During the evaluation of photocatalytic activity in pure water, the H₂ production rate for BZO-HT (27.80 μmol/g/h) is 9.4 times and six times higher than BZO-H and commercial BaZrO₃ (denoted as BZO-C), respectively. This work provides a reference for other facets-related photocatalysts’ design for pure water reduction or splitting.
Agid:
6207235