التفاصيل البيبلوغرافية
| العنوان: |
Photocatalytic generation of hydrogen by core-shell WO3/BiVO4 nanorods with ultimate water splitting efficiency |
| المؤلفون: |
Sonya Kosar, Ivan Turkevych, Takuya Matsui, Jin Uemura, Masahiro Tosa, Yuriy Pihosh, Takeyoshi Sugaya, Kikuo Makita, Kazuma Mawatari, Michio Kondo, Takehiko Kitamori, Daisuke Fujita, Yutaka Kazoe |
| المصدر: |
Scientific Reports. |
| بيانات النشر: |
Nature Publishing Group, 2015. |
| سنة النشر: |
2015 |
| مصطلحات موضوعية: |
Photocurrent, Multidisciplinary, Materials science, Hydrogen, business.industry, chemistry.chemical_element, Heterojunction, chemistry, Photocatalysis, Optoelectronics, Water splitting, Charge carrier, Nanorod, business, Photocatalytic water splitting |
| الوصف: |
Efficient photocatalytic water splitting requires effective generation, separation and transfer of photo-induced charge carriers that can hardly be achieved simultaneously in a single material. Here we show that the effectiveness of each process can be separately maximized in a nanostructured heterojunction with extremely thin absorber layer. We demonstrate this concept on WO3/BiVO4+CoPi core-shell nanostructured photoanode that achieves near theoretical water splitting efficiency. BiVO4 is characterized by a high recombination rate of photogenerated carriers that have much shorter diffusion length than the thickness required for sufficient light absorption. This issue can be resolved by the combination of BiVO4 with more conductive WO3 nanorods in a form of core-shell heterojunction, where the BiVO4 absorber layer is thinner than the carrier diffusion length while it’s optical thickness is reestablished by light trapping in high aspect ratio nanostructures. Our photoanode demonstrates ultimate water splitting photocurrent of 6.72 mA cm−2 under 1 sun illumination at 1.23 VRHE that corresponds to ~90% of the theoretically possible value for BiVO4. We also demonstrate a self-biased operation of the photoanode in tandem with a double-junction GaAs/InGaAsP photovoltaic cell with stable water splitting photocurrent of 6.56 mA cm−2 that corresponds to the solar to hydrogen generation efficiency of 8.1%. |
| اللغة: |
English |
| تدمد: |
2045-2322 |
| DOI: |
10.1038/srep11141 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4231077234b9942f796c1833ae595f41 |
| Rights: |
OPEN |
| رقم الانضمام: |
edsair.doi.dedup.....4231077234b9942f796c1833ae595f41 |
| قاعدة البيانات: |
OpenAIRE |