期刊
ELECTROCHIMICA ACTA
卷 260, 期 -, 页码 150-156出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.11.089
关键词
MoS2; Metal chalcogenides; Photoelectrocatalysis; Photoanode
资金
- Basic Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2015R1D1A1A01059069]
Vertically aligned MoS2 flakes were grown on indium tin oxide (ITO) and ITO/ZnO substrates using metalorganic chemical vapor deposition. The thickness of MoS2 flakes was manipulated at the few-layer level (5-10), which is desirable for energy-storage and energy-conversion applications. For photoelectrochemical (PEC) cells, a few-layer flake photoelectrode yielded a considerably higher photocurrent density (930 mu A/cm(2) at 0.2 V) than a MoS2 thin-film photoelectrode (360 mu A/cm(2) at 0.2 V) due to the former's high density of active sites, slow intraband relaxation rate from excitonic states, and low defect density. Furthermore, the heterostructure of ZnO/MoS2 flakes exhibited a remarkably high photocurrent density of 1.6 mA/cm(2) at 0.2 V and a long-term stability under the PEC operating conditions because of its enhanced photogenerated carrier separation and transfer. Thus, such a heterostructure is promising as an efficient, nontoxic, inexpensive, and earth-abundant PEC electrode. (c) 2017 Elsevier Ltd. All rights reserved.
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