期刊
APPLIED SURFACE SCIENCE
卷 502, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144189
关键词
Zinc oxide; Graphene; Morphology; Photoelectrochemical; Photodegradation
类别
资金
- National Research Foundation of Korea (NRF) project - Korean Government (Ministry of Education) [2018R1D1A3B07049264]
- National Research Foundation of Korea [2018R1D1A3B07049264, 22A20130011030] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Graphene-ZnO nanocomposites with different morphologies (nanoparticles and nanorods) were synthesized by alkali precipitation and solvothermal process. The influence of graphene nanosheets on photocatalytic and photoelectrochemical (PEC) activity of graphene-ZnO nanorods (ZnO/GNR) and graphene/ZnO nanoparticles (ZnO/GNP) was investigated. ZnO/GNR showed greatly increased photocatalytic degradation of methyl orange (MO): 2-, 2.5- and 3.5-fold higher under UV light and 1.6-, 4.7-, and 11-fold higher under visible light than that for ZnO/GNP, ZnO NR and ZnO NP, respectively. In addition, ZnO/GNR showed remarkable photocorrosion suppression (similar to 0.5%) compared to 10, 35 and 45% for ZnO/GNP, ZnO NR and ZnO NP, respectively. Furthermore, PEC results indicated a remarkable 6-fold enhancement photocurrent density for ZnO/GNR compared to ZnO NR. This enhancement is attributed to the crucial role of graphene in the electron transfer from ZnO NR into graphene sheets increasing the electron lifetime, leading to a minimized charge recombination.
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