Journal
ENERGY TECHNOLOGY
Volume 9, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.202100123
Keywords
flexible electrodes; graphene; organic semiconductors; photocatalytic hydrogen evolution
Categories
Funding
- JSPS Japanese-German Graduate Externship [2019/R1]
- JSPS KAKENHI [9H02809, 19K15502, 20K20946]
- Sumitomo Foundation
- Hibi Science Foundation
- Thermal & Electric Energy Technology Foundation
- Society of Iodine Science
- Deutsche Forschungsgemeinschaft (DFG) [GRK2495/J]
- Aufbruch Bayern initiative of the state of Bavaria
- Grants-in-Aid for Scientific Research [19K15502, 20K20946] Funding Source: KAKEN
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By investigating the photocatalytic properties of organic semiconductors and heterostructure effects, it was found that depositing Ni metal further enhanced the photoresponse current and improved the durability of the organic semiconductors. A flexible photocatalytic electrode for solar hydrogen generation was successfully prepared.
Two kinds of visible light-responsible organic semiconductors (epindolidione [EPI] and fluorinated EPI [2F-EPI]) are synthesized. The solar hydrogen evolution photocatalytic electrode properties of the organic semiconductors are investigated and the heterostructure effect caused by manipulating the order of the deposition of 2F-EPI and EPI is found, which increased the photoresponse current by reducing the carrier recombination of photoexcited electrons and holes. In addition, it is found that the deposition of Ni metal on the organic semiconductors further enhanced the photoresponse current and increased the durability of the organic semiconductor photocatalyst. Finally, a flexible photocatalytic electrode using graphene, organic semiconductors, and non-noble metal cocatalyst for solar hydrogen generation is prepared. A transparent flexible electric conductive film is prepared by transfer of a graphene sheet on the polymer film. The graphene electrode is coated by two kinds of organic semiconductors layer by layer to reduce recombination of photoexcited electrons and holes. Ni metal particles are deposited on the surface of the organic semiconductor layer as a cocatalyst to improve the photocatalytic property and durability of organic semiconductors. A clear photoresponse current (about 4 mu A cm(-2)) of the flexible photocatalytic electrode under the simulated solar light (AM 1.5 G, 100 mW cm(-2)) is observed.
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