Microstructure and electrochemical hydrogen storage characteristics of La0.67Mg0.33-xCaxNi2.75Co 0.25 (x = 0-0.15) electrode alloys

Zhenwei Dong, Yaoming Wu, Liqun Ma, Lidong Wang, Xiaodong Shen, Limin Wang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The microstructure and electrochemical hydrogen storage characteristics of La0.67Mg0.33-xCaxNi2.75Co 0.25 (x = 0, 0.05, 0.10 and 0.15) alloys are investigated. The results show that all alloys mainly consist of (La, Mg)Ni3 and LaNi5 phases, besides a small amount of (La, Mg)2Ni 7 phase. The cycle stability (S80) after 80 charge/discharge cycles of all alloy electrodes first increases from 60.1% (x = 0) to 64.2% (x = 0.05), then decreases to 45.9% (x = 0.15). The high rate dischargeability of all alloy electrodes first increases from 52.6% (x = 0) to 61.4% (x = 0.10), then decreases to 57.2% (x = 0.15). Moreover, the charge-transfer resistance (Rct) first decreases from 168.2 mΩ (x = 0) to 125.7 mΩ (x = 0.10), then increases to 136.6 mΩ (x = 0.15). All the results indicate that the substitution of Mg with a certain amount of Ca can improve the overall electrochemical characteristics.

Original languageEnglish
Pages (from-to)3050-3055
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume36
Issue number4
DOIs
StatePublished - Feb 2011

Keywords

  • AB-type alloy
  • Electrochemical kinetics
  • Hydrogen storage
  • MH/Ni battery

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