Controllable Synthesis of Carbon Nitride Films with Type-II Heterojunction for Efficient Photoelectrochemical Cells
| العنوان: | Controllable Synthesis of Carbon Nitride Films with Type-II Heterojunction for Efficient Photoelectrochemical Cells |
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| المؤلفون: | Liel Abisdris, Jiawei Xia, Neeta Karjule, Menny Shalom, Michael Volokh |
| المصدر: | Chemistry of Materials |
| مصطلحات موضوعية: | Photocurrent, Materials science, General Chemical Engineering, education, Heterojunction, 02 engineering and technology, General Chemistry, Substrate (electronics), Photoelectrochemical cell, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, law.invention, chemistry.chemical_compound, chemistry, Chemical engineering, law, Materials Chemistry, Calcination, 0210 nano-technology, Carbon nitride |
| الوصف: | A simple, straightforward growth method for polymeric carbon nitride (CN) layers on a conductive substrate, with excellent photoelectrochemical activity, owing to the formation of a type-II heterojunction by combining two distinct chemical growth methods, is reported. The first layer consists of CN prepared from the calcination of a melem–melamine (MeM) adduct; the utilization of MeM enables the preparation of a processable paste, which can be easily cast on the conductive substrate. To prepare the second layer, melamine vapor is introduced during calcination. After calcination, two well-connected CN layers with different electronic properties are formed, leading to the formation of a type-II heterojunction. The new CN films exhibit excellent photoelectrochemical properties with a photocurrent density of up to 383 μA cm–2at 1.23 V versus reversible hydrogen electrode as well as an acceptable stability over 9 h in 10% (v/v) TEOA-containing 0.1 M KOH aqueous solution, thanks to the enhanced charge separation under illumination. Moreover, the CN films demonstrate good photoelectrochemical activity over a wide pH range, with photocurrent densities of 133, 80, and 118 μA cm–2in 0.1 M KOH, 0.1 M Na2SO4, and 0.5 M H2SO4aqueous solutions in the absence of any sacrificial agent, respectively. |
| اللغة: | English |
| تدمد: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.0c01856 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c2612207a4248b325d4cee17352fa58 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....6c2612207a4248b325d4cee17352fa58 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15205002 08974756 |
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| DOI: | 10.1021/acs.chemmater.0c01856 |