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- Liang, Z P, et al.
(author)
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Electrochemical study of the XNA on Gold (TM) microarray
- 2004
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In: Biosensors & Bioelectronics. - : Elsevier BV. - 1873-4235 .- 0956-5663. ; 20:2, s. 211-216
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Journal article (peer-reviewed)abstract
- A novel electrode array was developed based on the XNA on Gold(TM) microarray platform. The platform combines self-assembling monolayers, thick film patterning and streptavidin based immobilization to provide a robust, versatile platform capable of analysing virtually any biomolecule including nucleic acids, proteins, carbohydrates and lipids. Electrochemical analysis of the self-assembling monolayer/streptavidin (SAMS) XNA on Gold(TM) coating revealed that the ferrocene redox current for the SAMS modified electrode was greater than that with a bare Gold(TM) electrode. The electrochemical reaction of K4Fe(CN)(6) was inhibited by the SAMS coating, but was reactivated upon addition of ferrocene. These results indicate that ferrocene is involved as a mediator in the electron transfer of K4Fe(CN)(6) to the SAMS modified electrode. Addition of DNA to the SAMS resulted in only a minor change in the electrochemical signal, indicating that XNA on Gold(TM) can be used for electrochemical based bioanalysis. After cycling a SAMS electrode 50 times, no signs of deterioration were detected showing that coating has excellent stability. In addition to the biosensing applications, the scheme provides a non-invasive method for accessing the quality of the SAMS coatings which is of industrial interest. These studies show that the XNA on Gold(TM) microarray platform can be used for electrochemical studies, thus providing an additional alternative for developing multianalyte biosensors as well as expanding the range of detection methods available for microarray analysis. (C) 2004 Elsevier B.V. All rights reserved.
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| 2. |
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| 3. |
- Zhu, Bin, et al.
(author)
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Innovative low temperature SOFCs and advanced materials
- 2003
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In: Journal of Power Sources. - 0378-7753 .- 1873-2755. ; 118:02-jan, s. 47-53
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Journal article (peer-reviewed)abstract
- High ionic conductivity, varying from 0.01 to 1 S cm(-1) between 300 and 700 degreesC, has been achieved for the hybrid and nano-ceriacomposite electrolyte materials, demonstrating a successful application for advanced low temperature solid oxide fuel cells (LTSOFCs). The LTSOFCs were constructed based on these new materials. The performance of 0.15-0.25 W cm(-2) was obtained in temperature region of 320400 degreesC for the ceria-carbonate composite electrolyte, and of 0.35-0.66 W cm(-2) in temperature region of 500-600 degreesC for the ceria-lanthanum oxide composites. The cell could even function at as low as 200 degreesC. The cell has also undergone a life test for several months. A two-cell stack was studied, showing expected performance successfully. The excellent LTSOFC performance is resulted from both functional electrolyte and electrode materials. The electrolytes are two phase composite materials based on the oxygen ion and proton conducting phases, or two rare-earth oxides. The electrodes used were based on the same composite material system having excellent compatibility with the electrolyte. They are highly catalytic and conductive thus creating the excellent performances at low temperatures. These innovative LT materials and LTSOFC technologies would open the door for wide applications, not only for stationary but also for mobile power sources.
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| 4. |
- Zhu, Bin, et al.
(author)
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Innovative solid carbonate-ceria composite electrolyte fuel cells
- 2001
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In: Electrochemistry communications. - 1388-2481 .- 1873-1902. ; 3:10, s. 566-571
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Journal article (peer-reviewed)abstract
- An innovative solid carbonate-oxide composite and related fuel cell (FC) technology is reported, It was discovered that solid carbonate-ceria composite (SCC) electrolytes were highly conductive with the material conductivity level varying from 0.001 to 0.2 S cm(-1) between 400 and 600 degreesC, and related FCs reached a power density between 200 and 600 mW cm(2) at a Current density of 300-1200 mA cm(-2) in the same temperature region. The SCCs were discovered to possess both oxide-ion (originating from the ceria phase) and proton (from the carbonate phase) conduction. Being an all-solid ceramic FC. the SCC can effectively reduce the material corrosion problem that is serious for the molten carbonate fuel cells (MCFCs). On the other hand, the innovative FC technology based on the SCC electrolytes developed in this work is similar to solid oxide fuel cells (SOF'Cs) and different from the MCFCs based on their ionic transport and FC processes, which facilitates a development of new type of advanced FC technology.
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