Improved electrochemical performance of BCC alloy by Ni addition and surface modification with AB5 alloy
| Autor: | Xuebin Yu, Z. Wu, Tiesheng Huang |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Hydrogen Mechanical Engineering Metallurgy Alloy Metals and Alloys Intermetallic chemistry.chemical_element Laves phase engineering.material Hydrogen storage Lattice constant Chemical engineering chemistry Mechanics of Materials Phase (matter) Desorption Materials Chemistry engineering |
| Zdroj: | Journal of Alloys and Compounds. 476:787-790 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2008.09.105 |
| Popis: | The hydrogen storage and electrochemical properties of the Ti0.32Mn0.22Cr0.1V0.28Nix (x = 0, 0.05, 0.15, 0.2) alloys were investigated. XRD results revealed that the addition of Ni resulted in the formation of C14 Laves phase. With the increasing Ni content, the lattice parameter a of BCC phase and the lattice parameter a and c of C14 Laves phase decreased. The Ni addition reduced the hydrogen absorption/desorption capacities at gas solid reaction, but improved the electrochemical discharge capacity significantly. The maximum discharge capacity of 392 mAh g−1 was obtained for the Ti0.32Mn0.22Cr0.1V0.28Ni0.15 alloy. Cycling measurement revealed that the discharge capacity of the Ti0.32Mn0.22Cr0.1V0.28Ni0.15 alloy degraded with the increasing cycle number, decreasing to 63% of the maximum discharge capacity after 100 cycles. Further improvement on the activation and cycle life of this alloy can be achieved by surface modification with 20 wt.% LaNi3.55Co0.75Mn0.4Al0.3 addition. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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