The effect of atmospheric pressure on the growth rate of TiO2 nanotubes: Evidence against the field-assisted dissolution theory
The growth mechanism of anodic TiO2 nanotubes has been a hot topic in recent years. The classical field-assisted dissolution (FAD) theory holds that the atmospheric pressure does not affect the growth of nanotubes, while the oxygen bubble model holds that the decrease of pressure is beneficial to th...
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Elsevier
2021-11-01
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| Series: | Electrochemistry Communications |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1388248121002307 |
| _version_ | 1818741916097839104 |
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| author | Pengze Li Jin Wang Lin Liu Juanjuan Ma Yilin Ni Heng Wang Ye Song |
| author_facet | Pengze Li Jin Wang Lin Liu Juanjuan Ma Yilin Ni Heng Wang Ye Song |
| author_sort | Pengze Li |
| collection | DOAJ |
| description | The growth mechanism of anodic TiO2 nanotubes has been a hot topic in recent years. The classical field-assisted dissolution (FAD) theory holds that the atmospheric pressure does not affect the growth of nanotubes, while the oxygen bubble model holds that the decrease of pressure is beneficial to the nanotube growth. In order to verify the oxygen bubble model, anodizing processes at three different pressures (0.1 MPa, 0.05 MPa and 0.005 MPa), three different currents and three different NH4F concentrations were studied. To the best our knowledge, some interesting results are obtained which cannot be obtained at standard atmospheric pressure (1 atm = 0.1 MPa). (1) In the same NH4F electrolyte, the same current density and the same temperature, the reduction of anodizing atmospheric pressure can improve the growth rate of TiO2 nanotubes. (2) Under the condition of the same temperature and current density, with the increase of NH4F concentration (0.3 wt%, 0.4 wt% and 0.5 wt%), the porosity of the nanotubes increases, and the growth rate of the nanotubes decreases obviously. These findings can serve as counterevidence to the FAD theory. |
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| id | doaj.art-c7eab6f509624b6a822b48a2fb7ac4ae |
| institution | Directory Open Access Journal |
| issn | 1388-2481 |
| language | English |
| last_indexed | 2024-12-18T02:04:13Z |
| publishDate | 2021-11-01 |
| publisher | Elsevier |
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| series | Electrochemistry Communications |
| spelling | doaj.art-c7eab6f509624b6a822b48a2fb7ac4ae2022-12-21T21:24:40ZengElsevierElectrochemistry Communications1388-24812021-11-01132107146The effect of atmospheric pressure on the growth rate of TiO2 nanotubes: Evidence against the field-assisted dissolution theoryPengze Li0Jin Wang1Lin Liu2Juanjuan Ma3Yilin Ni4Heng Wang5Ye Song6School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, China; Hubei Gather Electronics Co., LTD., Shiyan 442300, ChinaHubei Gather Electronics Co., LTD., Shiyan 442300, ChinaSchool of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, China; Corresponding authors.School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, ChinaSchool of Chemistry and Chemical Engineering, NanJing University of Science and Technology, NanJing 210094, ChinaSchool of Chemistry and Chemical Engineering, NanJing University of Science and Technology, NanJing 210094, ChinaSchool of Chemistry and Chemical Engineering, NanJing University of Science and Technology, NanJing 210094, China; Corresponding authors.The growth mechanism of anodic TiO2 nanotubes has been a hot topic in recent years. The classical field-assisted dissolution (FAD) theory holds that the atmospheric pressure does not affect the growth of nanotubes, while the oxygen bubble model holds that the decrease of pressure is beneficial to the nanotube growth. In order to verify the oxygen bubble model, anodizing processes at three different pressures (0.1 MPa, 0.05 MPa and 0.005 MPa), three different currents and three different NH4F concentrations were studied. To the best our knowledge, some interesting results are obtained which cannot be obtained at standard atmospheric pressure (1 atm = 0.1 MPa). (1) In the same NH4F electrolyte, the same current density and the same temperature, the reduction of anodizing atmospheric pressure can improve the growth rate of TiO2 nanotubes. (2) Under the condition of the same temperature and current density, with the increase of NH4F concentration (0.3 wt%, 0.4 wt% and 0.5 wt%), the porosity of the nanotubes increases, and the growth rate of the nanotubes decreases obviously. These findings can serve as counterevidence to the FAD theory.http://www.sciencedirect.com/science/article/pii/S1388248121002307AnodizationAtmospheric pressureGrowth rateGrowth kinetics |
| spellingShingle | Pengze Li Jin Wang Lin Liu Juanjuan Ma Yilin Ni Heng Wang Ye Song The effect of atmospheric pressure on the growth rate of TiO2 nanotubes: Evidence against the field-assisted dissolution theory Electrochemistry Communications Anodization Atmospheric pressure Growth rate Growth kinetics |
| title | The effect of atmospheric pressure on the growth rate of TiO2 nanotubes: Evidence against the field-assisted dissolution theory |
| title_full | The effect of atmospheric pressure on the growth rate of TiO2 nanotubes: Evidence against the field-assisted dissolution theory |
| title_fullStr | The effect of atmospheric pressure on the growth rate of TiO2 nanotubes: Evidence against the field-assisted dissolution theory |
| title_full_unstemmed | The effect of atmospheric pressure on the growth rate of TiO2 nanotubes: Evidence against the field-assisted dissolution theory |
| title_short | The effect of atmospheric pressure on the growth rate of TiO2 nanotubes: Evidence against the field-assisted dissolution theory |
| title_sort | effect of atmospheric pressure on the growth rate of tio2 nanotubes evidence against the field assisted dissolution theory |
| topic | Anodization Atmospheric pressure Growth rate Growth kinetics |
| url | http://www.sciencedirect.com/science/article/pii/S1388248121002307 |
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