Gas phase hydrogen absorption and electrochemical performance of La2(Ni,Co,Mg,M)10 based alloys
Identifieur interne : 000121 ( Main/Repository ); précédent : 000120; suivant : 000122Gas phase hydrogen absorption and electrochemical performance of La2(Ni,Co,Mg,M)10 based alloys
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Abstract
The effect of M = In or Al on the hydrogenation behavior of the La2(Ni,Co,Mg,M)10 alloys at room temperature is presented. The ceramic like samples have been prepared by powder metallurgy route using pure Mg- and the La2Ni9-xMx alloy powder precursors. XRD analysis revealed predominantly the CaCu5-type structure for all final alloys. Partial substitution of Co by In in La2Ni8MgCo causes a slight decrease of hydrogen concentration whereas Al addition increases this parameter. The highest hydrogen concentration of 1.87 wt.% has been reached for La2(Ni8Co0.8Al0.2)Mg composition at hydrogen pressure of 10 bar. Indium addition dramatically decreases the middle-plateau hydrogen equilibrium pressure from peq = 0.37 bar (In-free alloy) to peq = 0.06 bar (1.7 at.% In). The electrochemical performance of the studied materials has been characterized using chronoamperometric and chronopotentiometric techniques. The galvanostatic hydrogenation experiments at 185 mA/g discharge rate revealed the largest discharge current capacity of 355 mAh/g for La2(Ni8-Co0.8Al0.2)Mg alloy. The relative diffusivity factor of hydrogen (DH/a2) varies for the tested materials in the range of (2.0-5.4).10-5 s-1.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Gas phase hydrogen absorption and electrochemical performance of La<sub>2</sub>(Ni,Co,Mg,M)<sub>10</sub> based alloys</title><author><name sortKey="Drulis, H" uniqKey="Drulis H">H. Drulis</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Low Temperatures and Structure Research PAS</s1><s2>Wroclaw</s2><s3>POL</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Pologne</country><wicri:noRegion>Institute of Low Temperatures and Structure Research PAS</wicri:noRegion></affiliation></author><author><name sortKey="Hackemer, A" uniqKey="Hackemer A">A. Hackemer</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Low Temperatures and Structure Research PAS</s1><s2>Wroclaw</s2><s3>POL</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Pologne</country><wicri:noRegion>Institute of Low Temperatures and Structure Research PAS</wicri:noRegion></affiliation></author><author><name sortKey="G Uchowski, P" uniqKey="G Uchowski P">P. G Uchowski</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Low Temperatures and Structure Research PAS</s1><s2>Wroclaw</s2><s3>POL</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Pologne</country><wicri:noRegion>Institute of Low Temperatures and Structure Research PAS</wicri:noRegion></affiliation></author><author><name sortKey="Giza, K" uniqKey="Giza K">K. Giza</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Chemistry, Czestochowa University of Technology</s1><s2>Czestochowa</s2><s3>POL</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Pologne</country><wicri:noRegion>Czestochowa</wicri:noRegion></affiliation></author><author><name sortKey="Adamczyk, L" uniqKey="Adamczyk L">L. Adamczyk</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Chemistry, Czestochowa University of Technology</s1><s2>Czestochowa</s2><s3>POL</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Pologne</country><wicri:noRegion>Czestochowa</wicri:noRegion></affiliation></author><author><name sortKey="Bala, H" uniqKey="Bala H">H. Bala</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Chemistry, Czestochowa University of Technology</s1><s2>Czestochowa</s2><s3>POL</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Pologne</country><wicri:noRegion>Czestochowa</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="inist">14-0100472</idno><date when="2014">2014</date><idno type="stanalyst">PASCAL 14-0100472 INIST</idno><idno type="RBID">Pascal:14-0100472</idno><idno type="wicri:Area/Main/Corpus">000011</idno><idno type="wicri:Area/Main/Repository">000121</idno></publicationStmt><seriesStmt><idno type="ISSN">0360-3199</idno><title level="j" type="abbreviated">Int. j. hydrogen energy</title><title level="j" type="main">International journal of hydrogen energy</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alloys</term><term>Discharge charge cycle</term><term>Hydrides</term><term>Hydrogen</term><term>Isotherm</term><term>Nickel</term><term>Performance</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Hydrogène</term><term>Performance</term><term>Nickel</term><term>Alliage</term><term>Hydrure</term><term>Isotherme</term><term>Cycle charge décharge</term></keywords><keywords scheme="Wicri" type="concept" xml:lang="fr"><term>Hydrogène</term><term>Nickel</term><term>Alliage</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The effect of M = In or Al on the hydrogenation behavior of the La<sub>2</sub>(Ni,Co,Mg,M)<sub>10</sub> alloys at room temperature is presented. The ceramic like samples have been prepared by powder metallurgy route using pure Mg- and the La<sub>2</sub>Ni<sub>9-x</sub>M<sub>x</sub> alloy powder precursors. XRD analysis revealed predominantly the CaCu<sub>5</sub>-type structure for all final alloys. Partial substitution of Co by In in La<sub>2</sub>Ni<sub>8</sub>MgCo causes a slight decrease of hydrogen concentration whereas Al addition increases this parameter. The highest hydrogen concentration of 1.87 wt.% has been reached for La<sub>2</sub>(Ni<sub>8</sub>Co<sub>0.8</sub>Al<sub>0.2</sub>)Mg composition at hydrogen pressure of 10 bar. Indium addition dramatically decreases the middle-plateau hydrogen equilibrium pressure from p<sub>eq</sub> = 0.37 bar (In-free alloy) to p<sub>eq</sub> = 0.06 bar (1.7 at.% In). The electrochemical performance of the studied materials has been characterized using chronoamperometric and chronopotentiometric techniques. The galvanostatic hydrogenation experiments at 185 mA/g discharge rate revealed the largest discharge current capacity of 355 mAh/g for La<sub>2</sub>(Ni<sub>8</sub>-Co<sub>0.8</sub>Al<sub>0.2</sub>)Mg alloy. The relative diffusivity factor of hydrogen (D<sub>H</sub>/a<sup>2</sup>) varies for the tested materials in the range of (2.0-5.4).10<sup>-5</sup> s<sup>-1</sup>.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0360-3199</s0></fA01><fA02 i1="01"><s0>IJHEDX</s0></fA02><fA03 i2="1"><s0>Int. j. hydrogen energy</s0></fA03><fA05><s2>39</s2></fA05><fA06><s2>5</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Gas phase hydrogen absorption and electrochemical performance of La<sub>2</sub>(Ni,Co,Mg,M)<sub>10</sub> based alloys</s1></fA08><fA11 i1="01" i2="1"><s1>DRULIS (H.)</s1></fA11><fA11 i1="02" i2="1"><s1>HACKEMER (A.)</s1></fA11><fA11 i1="03" i2="1"><s1>GŁUCHOWSKI (P.)</s1></fA11><fA11 i1="04" i2="1"><s1>GIZA (K.)</s1></fA11><fA11 i1="05" i2="1"><s1>ADAMCZYK (L.)</s1></fA11><fA11 i1="06" i2="1"><s1>BALA (H.)</s1></fA11><fA14 i1="01"><s1>Institute of Low Temperatures and Structure Research PAS</s1><s2>Wroclaw</s2><s3>POL</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></fA14><fA14 i1="02"><s1>Department of Chemistry, Czestochowa University of Technology</s1><s2>Czestochowa</s2><s3>POL</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></fA14><fA20><s1>2423-2429</s1></fA20><fA21><s1>2014</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>17522</s2><s5>354000506184620540</s5></fA43><fA44><s0>0000</s0><s1>© 2014 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>21 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>14-0100472</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>International journal of hydrogen energy</s0></fA64><fA66 i1="01"><s0>GBR</s0></fA66><fC01 i1="01" l="ENG"><s0>The effect of M = In or Al on the hydrogenation behavior of the La<sub>2</sub>(Ni,Co,Mg,M)<sub>10</sub> alloys at room temperature is presented. The ceramic like samples have been prepared by powder metallurgy route using pure Mg- and the La<sub>2</sub>Ni<sub>9-x</sub>M<sub>x</sub> alloy powder precursors. XRD analysis revealed predominantly the CaCu<sub>5</sub>-type structure for all final alloys. Partial substitution of Co by In in La<sub>2</sub>Ni<sub>8</sub>MgCo causes a slight decrease of hydrogen concentration whereas Al addition increases this parameter. The highest hydrogen concentration of 1.87 wt.% has been reached for La<sub>2</sub>(Ni<sub>8</sub>Co<sub>0.8</sub>Al<sub>0.2</sub>)Mg composition at hydrogen pressure of 10 bar. Indium addition dramatically decreases the middle-plateau hydrogen equilibrium pressure from p<sub>eq</sub> = 0.37 bar (In-free alloy) to p<sub>eq</sub> = 0.06 bar (1.7 at.% In). The electrochemical performance of the studied materials has been characterized using chronoamperometric and chronopotentiometric techniques. The galvanostatic hydrogenation experiments at 185 mA/g discharge rate revealed the largest discharge current capacity of 355 mAh/g for La<sub>2</sub>(Ni<sub>8</sub>-Co<sub>0.8</sub>Al<sub>0.2</sub>)Mg alloy. 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