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| 3. |
- Blomqvist, H., et al.
(författare)
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Structure and resistivity correlations in Mg2NiH4 studied with in situ X-ray diffraction
- 2003
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Ingår i: Journal of materials science letters. - 0261-8028 .- 1573-4811. ; 22:21, s. 1487-1489
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Tidskriftsartikel (refereegranskat)abstract
- Structure and resistivity correlations in Mg2NiH4 was studied using in situ X-ray diffraction. Microtwinning was found to be sensitive to the applied mechanical pressure or grinding and by compressing the heated hydride sample in a tablet press. The resistivity increased before the low-temperature->high temperature phase transition.
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| 4. |
- Hu, W. K., et al.
(författare)
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AB(5)-type hydrogen storage alloys as catalysts in hydrogen-diffusion electrodes for novel H-2/hydride//perovskite/O-2 alkaline fuel cells
- 2004
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Ingår i: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1520-6106 .- 1520-5207. ; 108:48, s. 18530-18534
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Tidskriftsartikel (refereegranskat)abstract
- Development of a non-noble-metal catalyst electrode is an important issue in the research and development of fuel cells. The catalytic activity and durability of AB(5)-type hydrogen storage alloys used in hydrogen-diffusion electrodes for alkaline fuel cells are evaluated. The experiments demonstrate that the activity and stability for hydrogen oxidation is greatly improved if the particle size is decreased from 5-30 to 1-10 mum. This also improves the electrode stability. SEM and XRD analyses show that no disintegration of the smaller catalyst particles is observed in long-term tests. A novel H-2/hydride//perovskite/O-2 alkaline fuel cell was constructed as a non-noble-metal fuel cell concept. The results showed that both gas-diffusion electrodes had high catalytic activities and good stability. A maximum power density of 54 mW/cm(2) was achieved at 120 mA/cm(2) when using H-2/O-2 and 49 mW/cm(2) at 100 mA/cm(2) when using H-2/air.
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- Hu, W. K., et al.
(författare)
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Zr-based AB(2)-type hydrogen storage alloys as dual catalysts of gas-diffusion electrodes in an alkaline fuel cell
- 2004
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Ingår i: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1520-6106 .- 1520-5207. ; 108:26, s. 8756-8758
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Tidskriftsartikel (refereegranskat)abstract
- Zr-based AB(2)-type hydrogen storage alloys as dual catalysts for hydrogen adsorption and oxidation reactions in alkaline fuel cells were investigated. A hydrogen-diffusion electrode composed of this hydride alloy was constructed, and its performance in terms of catalytic activities and durability was evaluated. Results demonstrated that the hydrogen-diffusion electrode had not only good activity but also excellent stability at a current density of 40-60 mA/cm(2) after surface treatments using a 1.0 M HF solution. XPS analyses showed that the improvement in catalytic activity is related to the formation of a nickel-rich layer and the removal of other oxides on the catalyst surface. The novel possible application of Zr-based hydride alloys could lead to an attempt to exploit new catalysts to lower material cost for hydrogen fuel cells.
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