CoFe Amorphous Double Hydroxides Modified Hematite Photoanode with the Synergism of Co and Fe for Enhanced Photoelectrochemical Water Oxidation
In this study, a hematite photoanode with a CoFe-ADH co-catalyst loaded on the surface was successfully prepared through hydrothermal treatment, annealing, and electrodeposition. We investigated the influence of the deposition time and Co/Fe molar ratio for CoFe-ADH on the performance of α-Fe<sub...
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MDPI AG
2023-08-01
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| author | Yue Chang Minmin Han Yang Wang Yehui Ding Fei Huang |
| author_facet | Yue Chang Minmin Han Yang Wang Yehui Ding Fei Huang |
| author_sort | Yue Chang |
| collection | DOAJ |
| description | In this study, a hematite photoanode with a CoFe-ADH co-catalyst loaded on the surface was successfully prepared through hydrothermal treatment, annealing, and electrodeposition. We investigated the influence of the deposition time and Co/Fe molar ratio for CoFe-ADH on the performance of α-Fe<sub>2</sub>O<sub>3</sub> in photoelectrochemical (PEC) water oxidation. With an optimized condition of CoFe-ADH, the prepared CoFe-ADH/α-Fe<sub>2</sub>O<sub>3</sub> photoanode exhibited a high photocurrent density of 1.58 mA/cm<sup>2</sup> at 1.23 V<sub>RHE</sub>, which is about 2.5 times as high as that of α-Fe<sub>2</sub>O<sub>3</sub>. A series of characterization results and detailed mechanism studies reveal that surface modification of hematite by introducing CoFe-ADH can boost the surface charge transfer efficiency, which can be attributed to the good optical transparency, the amorphous structure of CoFe-ADH, and the synergism of Co and Fe in CoFe-ADH. The good optical transparency contributes to decreasing the loss of light absorption by the photoanodes; the amorphous structure could prevent the formation of grain boundaries and provide more active catalytic sites for PEC water oxidation; and the synergism of Co and Fe in CoFe-ADH enhances photogenerated carriers effective separation and the hole’s injection. This work provides valuable insights into the influence of bimetallic co-catalysts on the PEC performance of photoanodes, offering guidance for photoanodes to achieve excellent performance. |
| first_indexed | 2024-03-10T22:56:46Z |
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| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T22:56:46Z |
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| spelling | doaj.art-ee909dfacf824bf684f118922fd325bc2023-11-19T09:57:36ZengMDPI AGCatalysts2073-43442023-08-01139123510.3390/catal13091235CoFe Amorphous Double Hydroxides Modified Hematite Photoanode with the Synergism of Co and Fe for Enhanced Photoelectrochemical Water OxidationYue Chang0Minmin Han1Yang Wang2Yehui Ding3Fei Huang4Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaNational Engineering Research Center for Intelligent Electrical Vehicle Power System, College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, ChinaInstitute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaIn this study, a hematite photoanode with a CoFe-ADH co-catalyst loaded on the surface was successfully prepared through hydrothermal treatment, annealing, and electrodeposition. We investigated the influence of the deposition time and Co/Fe molar ratio for CoFe-ADH on the performance of α-Fe<sub>2</sub>O<sub>3</sub> in photoelectrochemical (PEC) water oxidation. With an optimized condition of CoFe-ADH, the prepared CoFe-ADH/α-Fe<sub>2</sub>O<sub>3</sub> photoanode exhibited a high photocurrent density of 1.58 mA/cm<sup>2</sup> at 1.23 V<sub>RHE</sub>, which is about 2.5 times as high as that of α-Fe<sub>2</sub>O<sub>3</sub>. A series of characterization results and detailed mechanism studies reveal that surface modification of hematite by introducing CoFe-ADH can boost the surface charge transfer efficiency, which can be attributed to the good optical transparency, the amorphous structure of CoFe-ADH, and the synergism of Co and Fe in CoFe-ADH. The good optical transparency contributes to decreasing the loss of light absorption by the photoanodes; the amorphous structure could prevent the formation of grain boundaries and provide more active catalytic sites for PEC water oxidation; and the synergism of Co and Fe in CoFe-ADH enhances photogenerated carriers effective separation and the hole’s injection. This work provides valuable insights into the influence of bimetallic co-catalysts on the PEC performance of photoanodes, offering guidance for photoanodes to achieve excellent performance.https://www.mdpi.com/2073-4344/13/9/1235photoelectrochemical water oxidationhematite photoanodesCoFe-ADH co-catalystthe synergism of Co and Fe |
| spellingShingle | Yue Chang Minmin Han Yang Wang Yehui Ding Fei Huang CoFe Amorphous Double Hydroxides Modified Hematite Photoanode with the Synergism of Co and Fe for Enhanced Photoelectrochemical Water Oxidation Catalysts photoelectrochemical water oxidation hematite photoanodes CoFe-ADH co-catalyst the synergism of Co and Fe |
| title | CoFe Amorphous Double Hydroxides Modified Hematite Photoanode with the Synergism of Co and Fe for Enhanced Photoelectrochemical Water Oxidation |
| title_full | CoFe Amorphous Double Hydroxides Modified Hematite Photoanode with the Synergism of Co and Fe for Enhanced Photoelectrochemical Water Oxidation |
| title_fullStr | CoFe Amorphous Double Hydroxides Modified Hematite Photoanode with the Synergism of Co and Fe for Enhanced Photoelectrochemical Water Oxidation |
| title_full_unstemmed | CoFe Amorphous Double Hydroxides Modified Hematite Photoanode with the Synergism of Co and Fe for Enhanced Photoelectrochemical Water Oxidation |
| title_short | CoFe Amorphous Double Hydroxides Modified Hematite Photoanode with the Synergism of Co and Fe for Enhanced Photoelectrochemical Water Oxidation |
| title_sort | cofe amorphous double hydroxides modified hematite photoanode with the synergism of co and fe for enhanced photoelectrochemical water oxidation |
| topic | photoelectrochemical water oxidation hematite photoanodes CoFe-ADH co-catalyst the synergism of Co and Fe |
| url | https://www.mdpi.com/2073-4344/13/9/1235 |
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