کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1271073 1497552 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improvement in high-temperature performance of Co-free high-Fe AB5-type hydrogen storage alloys
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Improvement in high-temperature performance of Co-free high-Fe AB5-type hydrogen storage alloys
چکیده انگلیسی

The effect of the iron content on the structural and electrochemical characteristics (20–60 °C) of the La0.78Ce0.22Ni3.73Mn0.30Al0.17FexCo0.8−x (x = 0, 0.2, 0.5, 0.8) hydrogen storage alloys has been investigated systematically. With increasing Fe content and temperature, the discharge capacity and high rate dischargeability deteriorates, but the difference among the four alloys almost disappears with temperature increases. However the cycling life and self-discharge characteristic improve, especially at high temperature (60 °C), the cycling stability increases from 7.1% of high-Co alloy to 44.1% of high-Fe alloy and the charge retention increases from 51.8% to 70.9% respectively. In addition, the high-temperature dischargeability and high-temperature recovery properties also improve when x = 0.8. Electrochemical kinetics, potentiodynamic polarization, inductively coupled plasma-atomic emission spectroscopy and scanning electron microscope analyses were conducted to investigate the surface corrosion of the alloys. The results demonstrated that the dissolution of Ni, Mn and Al can be suppressed significantly in virtue of the sacrifice of Fe content, leading to a good relative anti-corrosion ability of high-Fe alloy, and consequently, excellent cycling stability, charge retention and other high-temperature performance obtained.


► Effect of iron content in hydrogen storage alloy is investigated.
► High-Fe alloy has excellent cycling and self-discharge properties at 60 °C.
► Dissolution of Ni, Mn and Al can be suppressed for the self-sacrifice of Fe.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 37, Issue 17, September 2012, Pages 12375–12383
نویسندگان
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