Hydrogen storage and electrochemical properties of annealed low-Co AB5 type intermetallic compoundsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 30 апреля 2021 г.
Аннотация:The structure, hydrogen storage and electrochemical properties of annealed low-Co AB5-type intermetallic compounds have been investigated. La-alloy, Nd-alloy and Cr-alloy areused to represent La0.8Ce0.2Ni4Co0.4Mn0.3Al0.3, La0.6Ce0.2Nd0.2Ni4Co0.4Mn0.3Al0.3 and La0.6-Ce0.2Nd0.2Ni3.8Co0.4Mn0.3Al0.3Cr0.2, respectively. The XRD results indicated that annealedsamples are all single-phase alloys with CaCu5 type structure. The maximum of bothhydrogen content and discharge capacity is obtained for La-alloy 1.23 wt%H2 and321.1 mA h/g, respectively. All the investigated alloys are quiet stable with DH of hydrogendesorption about 36e38 kJ/mol H2. Cycle life of alloy electrode has been improved by partialsubstitution of La for Nd and Ni for Cr. The highest capacity retention of 92.2% after 100charge/discharge cycles at 1C has been observed for Nd-alloy. The hydrogen diffusioncoefficient measured by PITT is higher at the start of charging process and dramaticallyreduces by 2e3 order of magnitude with saturation of b-hydride. The highest value6.9 1013 cm2/s is observed for La alloy at 100% SOC. Partial substitution La for Nd and Crfor Ni in low-Co AB5 metal hydride alloys slightly reduces maximum discharge capacity,HRD performance and hydrogen diffusion kinetics. Low-Co alloys show good overallelectrochemical properties compared to high-Co alloys and might be perspective materialsfor various electrochemical applications.