Fabrication of highly electro catalytic active layer of multi walled carbon nanotube/enzyme for Pt-free dye sensitized solar cells
- Title
- Fabrication of highly electro catalytic active layer of multi walled carbon nanotube/enzyme for Pt-free dye sensitized solar cells
- Author
- 정성훈
- Keywords
- Multi walled carbon nanotube; Enzyme; Electro catalytic activity; Charge transfer resistance; Dye sensitized solar cell
- Issue Date
- 2015-05
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- APPLIED SURFACE SCIENCE, v. 349, Page. 174-183
- Abstract
- Highly dispersed conductive suspensions of multi walled carbon nanotubes (MWCNT) can have intrinsic electrical and electrochemical characteristics, which make them useful candidate for platinum (Pt)-free, dye sensitized solar cells (DSSCs). High energy conversion efficiency of 7.52% is demonstrated in DSSCs, based on enzyme dispersed MWCNT (E-MWCNT) layer deposited on fluorine doped tin oxide (FTO) glass. The E-MWCNT layer shows a pivotal role as platform to reduce large amount of iodide species via electro catalytically active layer, fabricated by facile tape casting under air drying technique. The E-MWCNT layer with large surface area, high mechanical adhesion, and good interconnectivity is derived from an appropriate enzyme dispersion, which provides not only enhanced interaction sites for the electrolyte/counter electrode interface but also improved electron transport mechanism. The surface morphology and structural characterization were investigated using field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS), Raman spectroscopy and electronic microscopy techniques. Electro catalytic activity (ECA) and electrochemical properties of E-MWCNT counter electrode (CE) were investigated using cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) measurements. The high power conversion efficiency (PCE) of E-MWCNT CE is associated with the low charge transfer resistance (R-CT = 1.39 Omega cm(2)) and excellent electro catalytic activity on the redox of the iodide/tri-iodide pair, as discovered by the cyclic voltammetry and electrochemical impedance spectroscopy investigations. This facile E-MWCNT configuration provides a concrete fundamental background towards the development of the third generation photovoltaic devices. (C) 2015 Elsevier B.V. All rights reserved.
- URI
- http://www.sciencedirect.com/science/article/pii/S016943321501065Xhttp://hdl.handle.net/20.500.11754/24827
- ISSN
- 0169-4332; 1873-5584
- DOI
- 10.1016/j.apsusc.2015.04.199
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Articles
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