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Aluminum-incorporated p-CuO/n-ZnO photocathode coated with nanocrystal-engineered TiO2 protective layer for photoelectrochemical water splitting and hydrogen generation
| Content Provider | Semantic Scholar |
|---|---|
| Author | Masudy-Panah, Saeid Eugene, Y.-J. Kong Khiavi, Negar Dasineh Katal, Reza Gong, Xiao |
| Copyright Year | 2018 |
| Abstract | The poor photocorrosion stability and low photovoltage of cupric oxide (CuO) are the main limiting factors of CuO-based photocathodes for solar-driven photoelectrochemical (PEC) water splitting and hydrogen evolution. In this paper, we demonstrate a highly efficient CuO-based photocathode fabricated on a glass substrate coated with fluorine-doped tin oxide (FTO). Incorporating aluminum (Al) into the thin CuO film (CuO:Al) and inserting a thin CuO interfacial layer between the CuO:Al film and the FTO-coated glass substrate is shown to improve the photocorrosion stability of the CuO and increase the photocurrent without increasing the dark current. We also demonstrate that depositing a layer of ZnO to form a buried p-(CuO/CuO:Al)/n-ZnO:Al heterojunction and controlling the carrier concentration and conductivity of the ZnO through the incorporation of Al can significantly improve the photovoltage and PEC activity of the photocathode, leading to a record-high photovoltage of ∼0.53 VRHE. By capping the photocathode with a crystal-engineered TiO2 protective layer, we are able to significantly stabilize the photocathode against photocorrosion and further improve the PEC activity of the final p-(CuO/CuO:Al)/n-ZnO:Al/TiO2/Au–Pd photocathode, resulting in record-high photocurrent density of ∼5.4 mA cm−2 and photocorrosion stability of ∼87% after 5 hours. |
| Starting Page | 11951 |
| Ending Page | 11965 |
| Page Count | 15 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C8TA03027H |
| Volume Number | 6 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c8/ta/c8ta03027h/c8ta03027h1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C8TA03027H |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
