Open AccessPhotocatalytic Reduction of CO2 by ZnO Micro/nanomaterials with Different Morphologies and Ratios of {0001} Facets
Author(s) -
Xiaodi Liu,
Liqun Ye,
Shanshan Liu,
Yinping Li,
Xiaoxu Ji
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep38474
Subject(s) - nanomaterials , nanorod , photocatalysis , materials science , high resolution transmission electron microscopy , distilled water , x ray photoelectron spectroscopy , nanotechnology , chemical engineering , specific surface area , surface area to volume ratio , chemistry , catalysis , transmission electron microscopy , chromatography , organic chemistry , engineering
ZnO microspheres, ZnO microflowers and ZnO nanorods are successfully synthesized via a convenient solvothermal method in distilled water-ethanol mixed medium. The as-prepared ZnO micro/nanomaterials are characterized by XRD, SEM, TEM, HRTEM, XPS, BET, and UV-Vis. The morphologies and exposed facets of the ZnO micro/nanomaterials can be controlled by simply changing the volume ratio of distilled water to ethanol, and their formation mechanisms are also proposed. In addition, the photocatalytic activities of the ZnO samples are investigated towards the photoreduction of CO 2 to CO. It is found that ZnO nanorods with high ratio of {0001} facets and large surface areas possess higher CO formation rate (3.814 μmol g −1 h −1 ) in comparison with ZnO microspheres and ZnO microflowers (3.357 and 1.627 μmol g −1 h −1 , respectively). The results can not only provide an important indication about the influence of the {0001} facets on the activity of CO 2 photoreduction over ZnO, but also demonstrate a strategy for tuning the CO 2 photoreduction performance by tailoring the surface structures of ZnO micro/nanomaterials.