Defect Engineering for Tuning the Photoresponse of Ceria-Based Solid Oxide Photoelectrochemical Cells
| Autor: | Yanuo Shi, Luyao Wang, Ziyu Wang, Giovanni Vinai, Luca Braglia, Enrico Traversa, Piero Torelli, Nan Yang, Weimin Liu, Carmela Aruta |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Absorption spectroscopy Settore ING-IND/22 Oxide 02 engineering and technology defect chemistry engineering 010402 general chemistry Electrochemistry 01 natural sciences chemistry.chemical_compound solar-to-chemical energy conversion General Materials Science Photoelectrochemical process Thin film doped ceria business.industry Doping Photoelectric effect Photoelectrochemical cell 021001 nanoscience & nanotechnology solid oxide photoelectrochemical cell 0104 chemical sciences chemistry thin films Optoelectronics 0210 nano-technology business |
| Zdroj: | ACS applied materials & interfaces (Online) (2020). info:cnr-pdr/source/autori:Yanuo Shi, Luyao Wang, Ziyu Wang, Giovanni Vinai, Luca Braglia, Piero Torelli, Carmela Aruta, Enrico Traversa, Weimin Liu, Nan Yang/titolo:Defect Engineering for Tuning the Photoresponse of Ceria-Based Solid Oxide Photoelectrochemical Cells/doi:/rivista:ACS applied materials & interfaces (Online)/anno:2020/pagina_da:/pagina_a:/intervallo_pagine:/volume |
| Popis: | Solid oxide photoelectrochemical cells (SOPECs) with inorganic ion-conducting electrolytes provide an alternative solution for light harvesting and conversion. Exploring potential photoelectrodes for SOPECs and understanding their operation mechanisms are crucial for continuously developing this technology. Here, ceria-based thin films were newly explored as photoelectrodes for SOPEC applications. It was found that the photoresponse of ceria-based thin films can be tuned both by Sm-doping-induced defects and by the heating temperature of SOPECs. The whole process was found to depend on the surface electrochemical redox reactions synergistically with the bulk photoelectric effect. Samarium doping level can selectively switch the open-circuit voltages polarity of SOPECs under illumination, thus shifting the potential of photoelectrodes and changing their photoresponse. The role of defect chemistry engineering in determining such a photoelectrochemical process was discussed. Transient absorption and X-ray photoemission spectroscopies, together with the state-of-the-art in operando X-ray absorption spectroscopy, allowed us to provide a compelling explanation of the experimentally observed switching behavior on the basis of the surface reactions and successive charge balance in the bulk. |
| Databáze: | OpenAIRE |
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