Electrochemical study of cobalt-free AB5-type hydrogen storage alloys
Identifieur interne : 000207 ( PascalFrancis/Checkpoint ); précédent : 000206; suivant : 000208Electrochemical study of cobalt-free AB5-type hydrogen storage alloys
Auteurs : C. Khaldi [Tunisie] ; H. Mathlouthi [Tunisie] ; Jilani Lamloumi [Tunisie] ; A. Percheron-Guegan [France]Source :
- International journal of hydrogen energy [ 0360-3199 ] ; 2004.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Hydrogène.
English descriptors
- KwdEn :
Abstract
Cobalt-free AB5-type hydrogen storage alloys have been examined for the purpose of lowering MH raw material costs. The electrochemical measurements showed that the cobalt-containing LaNi3.55Mn0.4Al0.3Co0.75 alloy had a maximum capacity of 300 mA h/g at a rate of C/6. The capacity decrease was calculated by 5% after 20 cycles at C/6 rate with 100% depth of discharge (DOD). The cobalt-free LaNi3.55Mn0.4Al0.3Fe0.75 alloy showed a very good cycling stability, although the initial capacity (250 mA h/g at C/6 rate) was lower than that of the cobalt containing alloy. The capacity decrease of the cobalt-free alloy amounted to 1% after 20 cycles under the same rate and DOD. The mechanism of hydriding/dehydriding reaction on the alloy electrodes was also investigated using a constant potential discharge (CPD) and cyclic voltammetry (CV) techniques. The obtained values of the hydrogen diffusion coefficient DH, were, 2 x 10-8 and 1.1 x 10-10 cm2 s-1 for LaNi3.55Mn0.4Al0.3Co0.75 and 8 × 10-9 and 1.0 x 10-10 cm2 s-1 for LaNi3.55Mn0.4Al0.3Fe0.75, by CV and by CPD, respectively.
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<front><div type="abstract" xml:lang="en">Cobalt-free AB<sub>5</sub>
-type hydrogen storage alloys have been examined for the purpose of lowering MH raw material costs. The electrochemical measurements showed that the cobalt-containing LaNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Co<sub>0.75</sub>
alloy had a maximum capacity of 300 mA h/g at a rate of C/6. The capacity decrease was calculated by 5% after 20 cycles at C/6 rate with 100% depth of discharge (DOD). The cobalt-free LaNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Fe<sub>0.75</sub>
alloy showed a very good cycling stability, although the initial capacity (250 mA h/g at C/6 rate) was lower than that of the cobalt containing alloy. The capacity decrease of the cobalt-free alloy amounted to 1% after 20 cycles under the same rate and DOD. The mechanism of hydriding/dehydriding reaction on the alloy electrodes was also investigated using a constant potential discharge (CPD) and cyclic voltammetry (CV) techniques. The obtained values of the hydrogen diffusion coefficient D<sub>H</sub>
, were, 2 x 10<sup>-8</sup>
and 1.1 x 10<sup>-10</sup>
cm<sup>2</sup>
s<sup>-1</sup>
for LaNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Co<sub>0.75</sub>
and 8 × 10<sup>-9</sup>
and 1.0 x 10<sup>-10</sup>
cm<sup>2</sup>
s<sup>-1</sup>
for LaNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Fe<sub>0.75</sub>
, by CV and by CPD, respectively.</div>
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Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Co<sub>0.75</sub>
alloy had a maximum capacity of 300 mA h/g at a rate of C/6. The capacity decrease was calculated by 5% after 20 cycles at C/6 rate with 100% depth of discharge (DOD). The cobalt-free LaNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Fe<sub>0.75</sub>
alloy showed a very good cycling stability, although the initial capacity (250 mA h/g at C/6 rate) was lower than that of the cobalt containing alloy. The capacity decrease of the cobalt-free alloy amounted to 1% after 20 cycles under the same rate and DOD. The mechanism of hydriding/dehydriding reaction on the alloy electrodes was also investigated using a constant potential discharge (CPD) and cyclic voltammetry (CV) techniques. The obtained values of the hydrogen diffusion coefficient D<sub>H</sub>
, were, 2 x 10<sup>-8</sup>
and 1.1 x 10<sup>-10</sup>
cm<sup>2</sup>
s<sup>-1</sup>
for LaNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Co<sub>0.75</sub>
and 8 × 10<sup>-9</sup>
and 1.0 x 10<sup>-10</sup>
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s<sup>-1</sup>
for LaNi<sub>3.55</sub>
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