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A robust ALD-protected silicon-based hybrid photoelectrode for hydrogen evolution under aqueous conditions† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c8sc05006f
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chandrasekaran, Soundarrajan Kaeffer, Nicolas Cagnon, Laurent Aldakov, Dmitry Fize, Jennifer Nonglaton, Guillaume Baleras, F. Mailley, Pascal Artero, Vincent |
| Copyright Year | 2019 |
| Abstract | Hydrogen production through direct sunlight-driven water splitting in photo-electrochemical cells (PECs) is a promising solution for energy sourcing. PECs need to fulfill three criteria: sustainability, cost-effectiveness and stability. Here we report an efficient and stable photocathode platform for H2 evolution based on Earth-abundant elements. A p-type silicon surface was protected by atomic layer deposition (ALD) with a 15 nm TiO2 layer, on top of which a 300 nm mesoporous TiO2 layer was spin-coated. The cobalt diimine-dioxime molecular catalyst was covalently grafted onto TiO2 through phosphonate anchors and an additional 0.2 nm ALD-TiO2 layer was applied for stabilization. This assembly catalyzes water reduction into H2 in phosphate buffer (pH 7) with an onset potential of +0.47 V vs. RHE. The resulting current density is -1.3 ± 0.1 mA cm-2 at 0 V vs. RHE under AM 1.5 solar irradiation, corresponding to a turnover number of 260 per hour of operation and a turnover frequency of 0.071 s-1. |
| Starting Page | 4469 |
| Ending Page | 4475 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C8SC05006F |
| PubMed reference number | 31057774 |
| Journal | Medline |
| Volume Number | 10 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c8/sc/c8sc05006f/c8sc05006f1.pdf |
| Alternate Webpage(s) | https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/a4/5f/SC-010-C8SC05006F.PMC6482884.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C8SC05006F |
| Journal | Chemical science |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |