期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003340
关键词
biomimetic nanochannels; bipyridine ruthenium; interfacial‐ potential‐ gradient; photoelectric conversion; thiophene polyelectrolyte
类别
资金
- National Key Research and Development Program of China [2017YFA0206902, 2017YFA0206900]
- National Natural Science Foundation of China [21771016, 21471012]
- Fundamental Research Funds for the Central Universities
A novel artificial light harvesting system based on ion transport, patterning two photosensitive molecules onto symmetric/asymmetric nanochannels, achieves high-efficient photoelectric conversion and enhanced ion transport performance.
Inspired by photosynthesis, the ion transport-based artificial light harvesting system shows unprecedented superiority in photoelectric conversion. However, how to high-efficiently utilize solar energy, just like photosystem I and photosystem II working together in the thylakoid membrane, remains a great challenge. Here, a facile strategy for patterning two photosensitive molecules is demonstrated, that is, thiophene polyelectrolyte (PTE-BS) and bipyridine ruthenium (N3), onto the two segments of symmetric/asymmetric hourglass-shaped alumina nanochannels. Owing to the different energy levels, an interfacial-potential-gradient is established in the tip junction of the nanochannels, wherein photoinduced excited electrons transfer from PTE-BS to N3, resulting in the efficient separation of electron-holes. Simultaneously, the increasing surface-charge-density enhances transmembrane ion transport performance. Thus, the photo-induced ionic current change ratio increases up to 100% to realize a significant photoelectric conversion, which is superior to all of the N3 or PTE-BS individually modified nanochannel systems. By changing the channel geometry from symmetric to asymmetric, the biomimetic nanochannels also exhibit a diode-like ion transport behavior. This work may provide guidance for the development of high-performance photoelectric conversion nanochannel systems.
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