期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 41, 页码 37586-37594出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b11178
关键词
photoelectrochemical; hydrogen production; heterojunctions; cadmium sulfide; molybdenum sulfide; photoanode
资金
- National Research Foundation of Korea [2018R1D1A1B07051059, 2019R1A2C3009157, 2016M3D1A1027664, NRF-2018K1A3A1A32055268]
- National Research Foundation of Korea [2019R1A2C3009157, 2018K1A3A1A32055268, 2018R1D1A1B07051059] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Cadmium sulfide (CdS) is a semiconducting absorber for photoelectrochemical (PEC) hydrogen production with suitable electronic band structures. However, it suffers from severe photocorrosion and rapid charge recombination during the desired PEC reactions. Herein, we describe the identification of the optimal junction thickness of CdS/MoS2 core/sheath heterojunction nanostructures by employing atomic layer deposition (ALD) techniques. ALD-grown MoS2 sheath layers with different thicknesses were realized on single-crystalline CdS nanorod (NR) arrays on transparent conducting oxide substrates. We further monitored the resulting solar H-2 evolution performance with our heterojunction photoanodes, The results showed that the junction thickness of MoS2 plays a key role in the reduction of photocorrosion and the enhanced photocurrent density by optimizing the charge separation. A better saturation photocurrent (similar to 46%) was obtained with the 7 nm-thick MoS2@CdS NRs than that with the bare CdS NRs. Moreover, the external quantum efficiency was increased twofold over that of the pristine CdS NRs. The ALD-grown MoS2@CdS heterojunction structures provides an efficient and versatile platform for hydrogen production when combining ALD-grown MoS2 with ideal semiconducting absorbers.
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