Download The Ni-YSZ interface PDF Free - Full Version
Download The Ni-YSZ interface by Jensen Karin Vels in PDF format completely FREE. No registration required, no payment needed. Get instant access to this valuable resource on PDFdrive.to!
About The Ni-YSZ interface
The anode/electrolyte interface ш solid oxide fuel cells (SOFC) is known to cause electrical losses. Geometrically simple Ni yttria-stabilised zirconia (YSZ) interfaces were examined to gain information on the structural and chemical changes occurring during experiments at 1000°C in an atmosphere of 97% H2/3% H20. Electrochemical impedance spectroscopy at open circuit voltage (OCV) and at anodic and cathodic polarisations (100 mV) was performed. A correlation of the electrical data with the structure development and the chemical composition was attempted. Nickel wires with different impurity content (99.8% Ni and 99.995% Ni) were used to examine the impact of impurities on the polarisation resistance and contact area morphology. The electropolished nickel wires were pressed against a polished 8 mol% YSZ surface.Extensive structural changes from a flat interface to a lull and valley structure were found to occur ш the contact area with the impure nickel wire, and a ridge of impurities was built along the rim of the contact area. Impurity particles in the interfacial region were also observed. The impurity phase was described as an alkali silicate glassy phase. No differences were found between polarised and non-polarised samples. With pure nickel wires, however, the microstructures depended on the polarisation /non-polarisation conditions. At non-polarised conditions a hill and valley type structure was found. Anodic polarisation produced an up to 1 um thick interface layer consisting of nano-sized YSZ particles with some Ni present. At cathodic polarisation both a granulated structure and a lull and valley structure resembling the structure of non-polarised samples were found. Small impurity ridges were surrounding the contact areas on non-polarised and cathodically polarised samples. TOF-SIMS and XPS analyses showed the presence of impurities in both the impure and pure contact areas. The impedance spectroscopy revealed that depending on the impurity content of the nickel, different developments of the polarisation resistance with time took place. At open circuit voltage the samples with impure nickel electrodes showed an initial increase toward a high constant polarisation resistance, whereas the samples with pure nickel electrodes showed a considerable decrease to a low constant polarisation resistance with time. For both types of nickel the polarisation resistance dropped upon polarisation. The area specific polarisation resistances for the samples with pure electrodes were approximately 10 times lower than for samples with impure electrodes. This was mainly ascribed to the impurity content and distribution, both in the three phase boundary zone and as a more or less continuous film covering the interfacial region. The drop in the Rp upon polarisation may be ascribed to changes ш the distribution of the impurity phase in the interfacial region.
Detailed Information
| Author: | Jensen Karin Vels |
|---|---|
| Publication Year: | 2002 |
| Pages: | 116 |
| Language: | English |
| File Size: | 4.51 |
| Format: | |
| Price: | FREE |
Safe & Secure Download - No registration required
Why Choose PDFdrive for Your Free The Ni-YSZ interface Download?
- 100% Free: No hidden fees or subscriptions required for one book every day.
- No Registration: Immediate access is available without creating accounts for one book every day.
- Safe and Secure: Clean downloads without malware or viruses
- Multiple Formats: PDF, MOBI, Mpub,... optimized for all devices
- Educational Resource: Supporting knowledge sharing and learning
Frequently Asked Questions
Is it really free to download The Ni-YSZ interface PDF?
Yes, on https://PDFdrive.to you can download The Ni-YSZ interface by Jensen Karin Vels completely free. We don't require any payment, subscription, or registration to access this PDF file. For 3 books every day.
How can I read The Ni-YSZ interface on my mobile device?
After downloading The Ni-YSZ interface PDF, you can open it with any PDF reader app on your phone or tablet. We recommend using Adobe Acrobat Reader, Apple Books, or Google Play Books for the best reading experience.
Is this the full version of The Ni-YSZ interface?
Yes, this is the complete PDF version of The Ni-YSZ interface by Jensen Karin Vels. You will be able to read the entire content as in the printed version without missing any pages.
Is it legal to download The Ni-YSZ interface PDF for free?
https://PDFdrive.to provides links to free educational resources available online. We do not store any files on our servers. Please be aware of copyright laws in your country before downloading.
The materials shared are intended for research, educational, and personal use in accordance with fair use principles.
