Effects of Nanowire Length on Charge Transport in Vertically Aligned Gold Nanowire Array Electrodes
| Autor: | Satoshi Teraji, Hideyuki Nakanishi, Qui Tran-Cong-Miyata, Ikuo Kikuta, Tomohisa Norisuye |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Nanowire Charge (physics) 02 engineering and technology Surfaces and Interfaces Internal resistance 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Capacitance 0104 chemical sciences Dielectric spectroscopy Ion Electrode Electrochemistry Optoelectronics General Materials Science Cyclic voltammetry 0210 nano-technology business Spectroscopy |
| Zdroj: | Langmuir. 34:15674-15680 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | In this study, we demonstrate that vertically aligned gold nanowire array electrodes provide rapid ion and electron transport to the electrode-electrolyte interface. The charge-transport properties of the nanowire electrodes were investigated through cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy under a constant-volume device configuration. The total charge stored in the corresponding devices increases monotonically with the length of the nanowires owing to the concomitant increase in the electroactive real surface area of the electrode. A remarkable feature of the electrodes is that the internal resistance associated with charge transport decreases with increasing nanowire length. The electric double-layer capacitance per unit electroactive surface area remains constant up to high charge/discharge rates. Our results demonstrate that charge migration occurs rapidly on the surfaces of the nanowires regardless of their length and the charge/discharge rate used. Thus, vertically aligned nanowire array electrodes show promise as current collectors for next-generation electrochemical energy-storage devices. |
| Databáze: | OpenAIRE |
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