Electrochemical Impedance Characterization of Porous Aluminum Oxide after Different Stages of Two-Step Anodization

Wang, Jing Zhe; Xu, Chun Hua; Cao, Wei; He, Yan

doi:10.4028/www.scientific.net/amr.953-954.1282

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Right after the cathodic polarization, the EIS of the broken-in thin film was taken (Figure d). In the EIS experiment, because the electrode was coated with the neutral semiconducting polymer thin film, the counterions needed to penetrate through the polymer thin film to reach the interfaces where the charge transfer occurs. , The EIS results can hence be fitted by the R s ( Q film R film )( Q dl R ct ), − where R s is the solution resistance, Q film and R film are the capacitance and resistance of the thin film, and Q dl and R ct are double-layer capacitance and charge transfer resistance at the ECP-black film/ITO interfaces. The fitted results were summarized in the Supporting Information (Table S1).…”

Section: Resultsmentioning

confidence: 99%

Self-Bleaching Behaviors in Black-to-Transmissive Electrochromic Polymer Thin Films

You

Mei

2017

ACS Appl. Mater. Interfaces

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Polymer-based electrochromic smart windows are an emerging energy-saving technology. There are several technological hurdles in the development of organic electrochromics. In this article, the self-bleaching behaviors of a black electrochromic polymer (ECP-black) thin film were investigated. We found that the electrochemical break-in process led to a less dense morphology and the increased free volume facilitated ion permeation in the ECP-black thin films. The polarized interface between the polymer thin film and transparent indium-tin-oxide (ITO) electrode made charge transfer accessible, which caused the self-bleaching behaviors. Herein, we proposed two approaches to study and mitigate the self-bleaching phenomenon. First, a densely packed morphology was regenerated by increasing the cathodic polarization time under open-circuit conditions (V). The second involved the modification of the electrode (ITO) surface with a partial coverage of the octadecyltrichlorosilane layer. The combination of the two approaches rendered the ECP-black thin film capable of maintaining the colored state for up to 900 s. To extend the scope of our studies, self-bleaching of ECP-magenta and ECP-blue thin films were also tested and suppressed by using these two methods. Additionally, the cycling stability of the ECP-black has been improved from ∼600 cycles to up to 2300 cycles without a noticeable decay of optical contrast.

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Section: Resultsmentioning

confidence: 99%

Self-Bleaching Behaviors in Black-to-Transmissive Electrochromic Polymer Thin Films

You

Mei

2017

ACS Appl. Mater. Interfaces

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“…A quantitative treatment of the EIS data is afforded by fitting the datasets to a classic equivalent circuit model shown in Figure 9c [25][26][27] The physical-chemical interpretation of the electrical element centers around the crucial double layer capacity C dl in parallel to the charge transfer resistance R ct to Faradaic electron transfer across the interface. A Warburg element W is placed in series with it to model mass and charge transport along the pore.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Preparation and Surface Functionalization of a Tunable Porous System Featuring Stacked Spheres in Cylindrical Pores

Terlinden

Engelhardt

et al. 2023

Adv Materials Inter

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A geometrically tunable nanoporous system featuring enhanced active surface area by stacking of spheres in cylindrical pores is fabricated. Highly ordered arrays of straight, constricted pores are obtained by anodization of metallic aluminum. Polystyrene (PS) spheres are assembled inside the pores by flowing their suspension through the porous membrane, whereas the construction serves as a filter. After surface functionalization with a noble metal catalyst, these model electrocatalysis systems exhibit functional properties (capacitance in electrochemical impedance spectroscopy) that mirror their geometric parameters. A systematic investigation of the system's geometry as it depends on the surface chemistry of the pores, on the one hand, and the physical parameters of the infiltration procedure, on the other hand, shows that mechanical stacking prevails over surface chemical interactions to determine the stacking density. The highest values of surface area are obtained when PS spheres are put in contact with HfO2 followed by ZnO according to adsorption measurements. Surface derivatization with organic layers does not improve stacking any further. However, choosing the proper concentration of PS spheres and flow rate are crucial for obtaining densely packed sphere assemblies without clogging of the pore entrance.

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Electrochemical Impedance Characterization of Porous Aluminum Oxide after Different Stages of Two-Step Anodization

Cited by 2 publications

References 5 publications

Self-Bleaching Behaviors in Black-to-Transmissive Electrochromic Polymer Thin Films

Self-Bleaching Behaviors in Black-to-Transmissive Electrochromic Polymer Thin Films

Preparation and Surface Functionalization of a Tunable Porous System Featuring Stacked Spheres in Cylindrical Pores

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