skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Photocatalytic pure water splitting activities for ZnGa{sub 2}O{sub 4} synthesized by various methods

Abstract

Highlights: • High temperature solid state reaction, hydrothermal, sol-gel methods were applied. • All ZnGa{sub 2}O{sub 4} samples show UV-light catalytic activities on pure water splitting. • Bulk ZnGa{sub 2}O{sub 4} has a good photocatalytic activity per specific surface area. • Sol-gel is a superior method to prepare nanosized ZnGa{sub 2}O{sub 4} with a high activity. • The AQY for SG-ZnGa{sub 2}O{sub 4} is 2.6% for pure water splitting under 313 nm irradiation. - Abstract: We studied and compared the photocatalytic water splitting performances for ZnGa{sub 2}O{sub 4} prepared by high temperature solid state reaction (HTSSR), hydrothermal (HY) and sol-gel (SG) methods. HTSSR-ZnGa{sub 2}O{sub 4} has a relative large photocatalytic activity per surface area (1.6 μmol/h/m{sup 2}) in pure water by UV irradiation due to its high crystallinity. The HY- and SG-samples both have small particle sizes (20∼30 nm) and therefore high surface area (20 and 29 m{sup 2}/g, respectively), which leads to superior photocatalytic H{sub 2} evolution rates per unit mass (11.5 and 28.5 μmol/h/g). The apparent quantum yield of SG-ZnGa{sub 2}O{sub 4} for pure water splitting under 313 nm irradiation is 2.6%. The existence of substantial surface defects is the major problem for HY- and SG-ZnGa{sub 2}O{sub 4}.more » Consequently, the usage of sacrificial agents could greatly enhance the activities and indeed the H{sub 2} evolution rates in 20 Vol. % methanol aqueous solution increase to 100 and 142 μmol/h/g for HY- and SG-ZnGa{sub 2}O{sub 4}, respectively.« less

Authors:
 [1]; ; ; ;  [1];  [1];  [1]
  1. College of Chemistry and Chemical Engineering, Chongqing University,Chongqing 400044 (China)
Publication Date:
OSTI Identifier:
22420782
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 61; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AQUEOUS SOLUTIONS; COMPARATIVE EVALUATIONS; GALLIUM OXIDES; HYDROGEN; IRRADIATION; METHANOL; NANOSTRUCTURES; PARTICLE SIZE; PHOTOCATALYSIS; SEMICONDUCTOR MATERIALS; SOL-GEL PROCESS; SOLIDS; SURFACE AREA; SURFACES; SYNTHESIS; ULTRAVIOLET RADIATION; WATER; ZINC COMPOUNDS

Citation Formats

Zeng, Chunmei, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, Hu, Tao, Hou, Nianjun, Liu, Siyao, Gao, Wenliang, Cong, Rihong, and Yang, Tao. Photocatalytic pure water splitting activities for ZnGa{sub 2}O{sub 4} synthesized by various methods. United States: N. p., 2015. Web. doi:10.1016/J.MATERRESBULL.2014.10.041.
Zeng, Chunmei, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, Hu, Tao, Hou, Nianjun, Liu, Siyao, Gao, Wenliang, Cong, Rihong, & Yang, Tao. Photocatalytic pure water splitting activities for ZnGa{sub 2}O{sub 4} synthesized by various methods. United States. https://doi.org/10.1016/J.MATERRESBULL.2014.10.041
Zeng, Chunmei, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, Hu, Tao, Hou, Nianjun, Liu, Siyao, Gao, Wenliang, Cong, Rihong, and Yang, Tao. 2015. "Photocatalytic pure water splitting activities for ZnGa{sub 2}O{sub 4} synthesized by various methods". United States. https://doi.org/10.1016/J.MATERRESBULL.2014.10.041.
@article{osti_22420782,
title = {Photocatalytic pure water splitting activities for ZnGa{sub 2}O{sub 4} synthesized by various methods},
author = {Zeng, Chunmei and College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002 and Hu, Tao and Hou, Nianjun and Liu, Siyao and Gao, Wenliang and Cong, Rihong and Yang, Tao},
abstractNote = {Highlights: • High temperature solid state reaction, hydrothermal, sol-gel methods were applied. • All ZnGa{sub 2}O{sub 4} samples show UV-light catalytic activities on pure water splitting. • Bulk ZnGa{sub 2}O{sub 4} has a good photocatalytic activity per specific surface area. • Sol-gel is a superior method to prepare nanosized ZnGa{sub 2}O{sub 4} with a high activity. • The AQY for SG-ZnGa{sub 2}O{sub 4} is 2.6% for pure water splitting under 313 nm irradiation. - Abstract: We studied and compared the photocatalytic water splitting performances for ZnGa{sub 2}O{sub 4} prepared by high temperature solid state reaction (HTSSR), hydrothermal (HY) and sol-gel (SG) methods. HTSSR-ZnGa{sub 2}O{sub 4} has a relative large photocatalytic activity per surface area (1.6 μmol/h/m{sup 2}) in pure water by UV irradiation due to its high crystallinity. The HY- and SG-samples both have small particle sizes (20∼30 nm) and therefore high surface area (20 and 29 m{sup 2}/g, respectively), which leads to superior photocatalytic H{sub 2} evolution rates per unit mass (11.5 and 28.5 μmol/h/g). The apparent quantum yield of SG-ZnGa{sub 2}O{sub 4} for pure water splitting under 313 nm irradiation is 2.6%. The existence of substantial surface defects is the major problem for HY- and SG-ZnGa{sub 2}O{sub 4}. Consequently, the usage of sacrificial agents could greatly enhance the activities and indeed the H{sub 2} evolution rates in 20 Vol. % methanol aqueous solution increase to 100 and 142 μmol/h/g for HY- and SG-ZnGa{sub 2}O{sub 4}, respectively.},
doi = {10.1016/J.MATERRESBULL.2014.10.041},
url = {https://www.osti.gov/biblio/22420782}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 61,
place = {United States},
year = {2015},
month = {1}
}