Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 27, Pages 31785-31798Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c10307
Keywords
carbon nitride; crystalline/amorphous contact; amorphous/amorphous contact; charge transitions; photocatalytic activity
Funding
- Brain Pool (BP) fellowship grant - Korea government [2019H1D3A1A01070060]
- National Research Foundation of Korea (NRF) - Korea government (MIST) [2019R1A2C2085250]
- National Research Foundation of Korea [2019H1D3A1A01070060, 2019R1A2C2085250] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study synthesized a novel CN/SiO2/WO3 photocatalyst with two different contact features, providing deep insights into the impact of SiO2 and the amorphous/amorphous interface on charge carriers and the role in photocatalytic mechanisms.
Making heterojunctions between semiamorphous carbon nitride (CN) and other well-matched semiconductors (or even insulators) can solve many photocatalytic problems such as the recombination of charge carriers. However, many researchers encounter intrinsic problems including the lack of detailed information on contact boundaries in their heterojunctions, particularly in the amorphous/amorphous interface. In addition, the roles of contact boundaries in the photocatalytic mechanisms of many heterojunctions are still obscure. This study synthesized a novel CN/SiO2/WO3 photocatalyst having two different contact features by constructing an amorphous/amorphous (CN/SiO2) interface and a crystalline/amorphous (WO3/CN) interface to provide deep insights into heterojunction interfaces. SiO2 plays an exceptional role as a major component in the separation and migration of charge carriers. It not only modifies the texture but also transfers electrons. Surprisingly, the amorphous/amorphous interface shows an unpredicted capability for decreasing the recombination of electron-hole pairs. Based on capturing experiments and photoluminescence investigations, the amorphous/amorphous interface is unprecedently present in the production of hydroxyl radicals, while the crystalline/amorphous interface gives more superoxide radicals. This work provides a platform that opens a new perspective on the selection of mutual photocatalysts. It extends boundaries of conventional heterojunctions.
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