Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate
Multi-junction copper oxide nanocomposite photocathodes formed by CuO nanowire arrays coated with Cu2O nanopyramids or stacked nanoprisms, i.e. CuO(NWA)|Cu2O(NPy), exhibit remarkable electrochemical stability toward reductive corrosion. Whilst bare CuO nanowires are extremely prone to decomposition...
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Elsevier
2025-01-01
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| Series: | Next Nanotechnology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S294982952400086X |
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| author | Tahereh Mokary Yazdely Ricard Garcia-Valls Alberto Puga |
| author_facet | Tahereh Mokary Yazdely Ricard Garcia-Valls Alberto Puga |
| author_sort | Tahereh Mokary Yazdely |
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| description | Multi-junction copper oxide nanocomposite photocathodes formed by CuO nanowire arrays coated with Cu2O nanopyramids or stacked nanoprisms, i.e. CuO(NWA)|Cu2O(NPy), exhibit remarkable electrochemical stability toward reductive corrosion. Whilst bare CuO nanowires are extremely prone to decomposition even at the mildest potentials applied, the core@shell morphology of CuO(NWA)|Cu2O(NPy) resists cathodic potentials up to −0.7 V (vs. AgCl/Ag). Precisely controlled electrodeposition of silver or gold nanoparticles resulted in Ag nanotrails arranged on flatter surface regions in CuO(NWA)|Cu2O(NPy)|Ag, whereas Au nanoaggregates were deposited on both flat areas and prominent apexes in CuO(NWA)|Cu2O(NPy)|Au. Photocurrent measurements demonstrated redox process activation, namely above three-fold current density increases, by light for CuO(NWA)|Cu2O(NPy). The participation of CO2 in them was also confirmed by around 70 % photocurrent increases (higher than 0.2 mA cm−2) and by sensibly milder cathodic potential onsets (≤ −0.4 V), as recorded by linear sweep voltammetry. Photoelectrochemical CO2 reduction experiments under simulated sunlight yielded oxygenated products in the liquid phase, chiefly formate, although acetate was also consistently produced, especially in the presence of noble metal co-catalysts. Specifically, acetate yields increased by 30–40 % for CuO(NWA)|Cu2O(NPy)|Ag and CuO(NWA)|Cu2O(NPy)|Au up to 56 and 54 μM, respectively. Methanol could be also formed under specific conditions. A mechanistic proposal is postulated to account for all stability and selectivity phenomena observed. |
| format | Article |
| id | doaj-art-e3282d33f8a842c887ec2d03f22c5f3b |
| institution | Kabale University |
| issn | 2949-8295 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Next Nanotechnology |
| spelling | doaj-art-e3282d33f8a842c887ec2d03f22c5f3b2025-08-20T03:30:45ZengElsevierNext Nanotechnology2949-82952025-01-01710012510.1016/j.nxnano.2024.100125Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetateTahereh Mokary Yazdely0Ricard Garcia-Valls1Alberto Puga2Department of Chemical Engineering, Universitat Rovira i Virgili, Av. Països Catalans 26, Tarragona 43007, SpainDepartment of Chemical Engineering, Universitat Rovira i Virgili, Av. Països Catalans 26, Tarragona 43007, SpainCorresponding author.; Department of Chemical Engineering, Universitat Rovira i Virgili, Av. Països Catalans 26, Tarragona 43007, SpainMulti-junction copper oxide nanocomposite photocathodes formed by CuO nanowire arrays coated with Cu2O nanopyramids or stacked nanoprisms, i.e. CuO(NWA)|Cu2O(NPy), exhibit remarkable electrochemical stability toward reductive corrosion. Whilst bare CuO nanowires are extremely prone to decomposition even at the mildest potentials applied, the core@shell morphology of CuO(NWA)|Cu2O(NPy) resists cathodic potentials up to −0.7 V (vs. AgCl/Ag). Precisely controlled electrodeposition of silver or gold nanoparticles resulted in Ag nanotrails arranged on flatter surface regions in CuO(NWA)|Cu2O(NPy)|Ag, whereas Au nanoaggregates were deposited on both flat areas and prominent apexes in CuO(NWA)|Cu2O(NPy)|Au. Photocurrent measurements demonstrated redox process activation, namely above three-fold current density increases, by light for CuO(NWA)|Cu2O(NPy). The participation of CO2 in them was also confirmed by around 70 % photocurrent increases (higher than 0.2 mA cm−2) and by sensibly milder cathodic potential onsets (≤ −0.4 V), as recorded by linear sweep voltammetry. Photoelectrochemical CO2 reduction experiments under simulated sunlight yielded oxygenated products in the liquid phase, chiefly formate, although acetate was also consistently produced, especially in the presence of noble metal co-catalysts. Specifically, acetate yields increased by 30–40 % for CuO(NWA)|Cu2O(NPy)|Ag and CuO(NWA)|Cu2O(NPy)|Au up to 56 and 54 μM, respectively. Methanol could be also formed under specific conditions. A mechanistic proposal is postulated to account for all stability and selectivity phenomena observed.http://www.sciencedirect.com/science/article/pii/S294982952400086XCarbon dioxideMethanolAcetateHeterojunctionCopper oxidesSolar fuels |
| spellingShingle | Tahereh Mokary Yazdely Ricard Garcia-Valls Alberto Puga Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate Next Nanotechnology Carbon dioxide Methanol Acetate Heterojunction Copper oxides Solar fuels |
| title | Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate |
| title_full | Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate |
| title_fullStr | Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate |
| title_full_unstemmed | Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate |
| title_short | Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate |
| title_sort | photoelectrochemical co2 reduction on cuo cu2o nanocomposites with noble metal co catalysts enhances the production of c1 oxygenates and acetate |
| topic | Carbon dioxide Methanol Acetate Heterojunction Copper oxides Solar fuels |
| url | http://www.sciencedirect.com/science/article/pii/S294982952400086X |
| work_keys_str_mv | AT taherehmokaryyazdely photoelectrochemicalco2reductiononcuocu2onanocompositeswithnoblemetalcocatalystsenhancestheproductionofc1oxygenatesandacetate AT ricardgarciavalls photoelectrochemicalco2reductiononcuocu2onanocompositeswithnoblemetalcocatalystsenhancestheproductionofc1oxygenatesandacetate AT albertopuga photoelectrochemicalco2reductiononcuocu2onanocompositeswithnoblemetalcocatalystsenhancestheproductionofc1oxygenatesandacetate |