Activation of superstoichiometric hydride alloy by its selective leaching in 6m koh solution Ochrona Przed Korozja, 2019
Electrochemical behavior of a nanostructured La1.25Gd0.25Mg0.5Ni7 hydrogen storage material modified with magnetron sputtered nickel Martyna Dymek, Marek Nowak, Mieczysław Jurczyk, Henryk Bala Journal of the Electrochemical Society, 2019 A nanocrystalline La1.25Gd0.25Mg0.5Ni7 hydrogen storage material with a dominant A2B7 phase was obtained by mechanical alloying (MA) and heat-treatment (1123 K for 0.5 h). The concentration of the AB5 phase is 6.4 at.% and is marginally lower than that in the Gd-free parent La1.5Mg0.5Ni7 alloy. The powder fraction of 20–50 μm was encapsulated with thin (0.31 μm thick), amorphous nickel using magnetron sputtering. Electrochemical multicycling allowed the determination of the corrosion kinetic parameters, as well as the exchange current density of a H2O/H2 system and the effective diffusivity of hydrogen. Partial substitution of Gd for La in the La1.5Mg0.5Ni7 nanocrystalline parent alloy increases the electrode discharge capacity (up to 16%) but somewhat deteriorates its activation properties. Gd addition does not affect the corrosion degradation resistance, although the corrosion properties are weakened after particle encapsulation with the amorphous nickel coating. Finally, in spite of the Gd-modified La1.5Mg0.5Ni7 nanocrystalline alloy revealing a 10% lower exchange current density of the H2O/H2 system compared to the parent alloy, this property can be considerably improved (by >50%) by Ni particle encapsulation. The hydrogen diffusivity of the Gd-modified material is faster compared to the parent material but is slowed down by the Ni coating.
Inhibition of LaNi5 electrode decay in alkaline medium by electroless encapsulation of active powder particles M. Dymek, H. Bala Journal of Solid State Electrochemistry, 2016 Surface of powdered LaNi5 intermetallic compound has been modified by active particle coverage with electroless nickel (Ni-P). The electrode degradation process in 6 M KOH solution has been tested across 70 charge/discharge cycles at −0.5 C/+0.5 C rates. It has been established that after approx. 25–35 initial cycles, the electrode degradation process fulfills first order chemical reaction kinetics law: logarithm of discharge capacity linearly decreases with cycle number. The rate constant for the Ni-P protected material is over 20 % lower than that of as received one. The surface modification also improves the alloy hydrogenation kinetics: exchange current densities of H2O/H2 system are generally greater for modified material and, contrary to uncovered material, do not practically decrease with long-lasting cycling.
Modification of activation and corrosion properties of LaNi4. 5Co0. 5 HSA by ball milling with Zn and preferential alkaline leaching M Dymek, J Gęga, M Nowak, M Jurczyk, H Bala Journal of Power Sources 573, 233138 , 2023 2023 Citations: 1
Determination of H2O/H2 system exchange current densities on cycled hydride electrodes from overswitch potential jump at low and high charge/discharge rates R Dahsa, M Dymek, YB Belgacem, J Lamloumi, C Khaldi, H Bala International Journal of Hydrogen Energy 48 (40), 15203-15214 , 2023 2023 Citations: 3
Comparison of corrosion kinetics of metallic-and ionic materials for negative composite electrodes of NiMH type battery W Zayani, M Dymek, H Bala Ochr Przed Koroz 4, 100-105 , 2021 2021 Citations: 9
Preferential alkaline leaching of amphoteric elements from super-stoichiometric hydrogen storage alloy M Dymek, J Gega, P Pawlik, H Bala International Journal of Hydrogen Energy 45 (24), 13387-13397 , 2020 2020 Citations: 8
Hydrogenation and corrosion properties of nanocrystalline A2B7 type, La-Mg-Ni based intermetallics modified by nickel sputtering M Dymek, M Nowak, M Jurczyk, H Bala Ochrona przed Korozją , 2020 2020 Citations: 1
Electrochemical characterization of nanocrystalline hydrogen storage La1. 5Mg0. 5Ni6. 5Co0. 5 alloy covered with amorphous nickel M Dymek, M Nowak, M Jurczyk, H Bala Journal of Alloys and Compounds 780, 697-704 , 2019 2019 Citations: 23
Electrochemical Behavior of a Nanostructured La 1.25 Gd 0.25 Mg 0.5 Ni 7 Hydrogen Storage Material Modified with Magnetron Sputtered Nickel M Dymek, M Nowak, M Jurczyk, H Bala Journal of The Electrochemical Society 166 (8), A1393-A1399 , 2019 2019 Citations: 10
Encapsulation of La1. 5Mg0. 5Ni7 nanocrystalline hydrogen storage alloy with Ni coatings and its electrochemical characterization M Dymek, M Nowak, M Jurczyk, H Bala Journal of Alloys and Compounds 749, 534-542 , 2018 2018 Citations: 37
Preparation and properties of Ni-MH hydride cells based on La2Ni9Co hydrogen storage alloys doped with Al or Sn H Drulis, A Hackemer, K Giza, L Adamczyk, M Dymek, H Bala Bulletin of the polish hydrogen and fuel cell association 11, 43 , 2017 2017
Determination of corrosion rate of porous, liquid permeable materials on the example of hydride powder composite H Bala, M Dymek Ochrona przed Korozją , 2017 2017 Citations: 16
Inhibition of LaNi 5 electrode decay in alkaline medium by electroless encapsulation of active powder particles M Dymek, H Bala Journal of Solid State Electrochemistry 20 (7), 2001-2007 , 2016 2016 Citations: 25
Corrosion degradation of powder composite hydride electrodes in conditions of long-lasting cycling H Bala, M Dymek Materials Chemistry and Physics 167, 265-270 , 2015 2015 Citations: 25
Electrochemical hydrogenation properties of LaNi4. 6Zn0. 4− xSnx alloys M Dymek, B Rozdzynska-Kielbik, VV Pavlyuk, H Bala Journal of Alloys and Compounds 644, 916-922 , 2015 2015 Citations: 14
Hydrogenation and Corrosion Properties of LaNi 4.5 Co 0.5 -Based Alloy Doped with 1.7 at% Sn M Dymek, H Bala, H Drulis, A Hackemer Solid State Phenomena 227, 263-266 , 2015 2015 Citations: 10
Hydrogen absorption by Co-substituted Nd-Fe-B high coercivity magnetic material H Bala, M Dymek, S Szymura, YM Rabinovich Solid State Phenomena 227, 271-274 , 2015 2015
Hydrogenation and electrochemical corrosion properties of LaNi4. 5Co0. 5 alloy doped with aluminum M Dymek, H Bala, A Hackemer, H Drulis Solid State Ionics 271, 116-120 , 2015 2015 Citations: 14
Alkaline leaching of amphoteric elements from powdered, overstoichiometric hydride material J Gęga, M Dymek, H Drulis, A Hackemer, P Indyka, H Bala Ochrona przed Korozją , 2015 2015 Citations: 2
Algorytm pomiarowy dla oceny parametrów elektrochemicznych elektrody wodorkowej w warunkach jej długotrwałego cyklowania M Dymek Mechanik 88 , 2015 2015
Development of metal hydride material efficient surface in conditions of galvanostatic charge/discharge cycling H Bala, M Dymek, H Drulis Materials Chemistry and Physics 148 (3), 1008-1012 , 2014 2014 Citations: 23
Hydrogen diffusivity, kinetics of H 2 O/H 2 charge transfer and corrosion properties of LaNi 5 -powder, composite electrodes in 6 M KOH solution H Bala, M Dymek, L Adamczyk, K Giza, H Drulis Journal of Solid State Electrochemistry 18 (11), 3039-3048 , 2014 2014 Citations: 33
MOST CITED SCHOLAR PUBLICATIONS
Encapsulation of La1. 5Mg0. 5Ni7 nanocrystalline hydrogen storage alloy with Ni coatings and its electrochemical characterization M Dymek, M Nowak, M Jurczyk, H Bala Journal of Alloys and Compounds 749, 534-542 , 2018 2018 Citations: 37
Hydrogen diffusivity, kinetics of H 2 O/H 2 charge transfer and corrosion properties of LaNi 5 -powder, composite electrodes in 6 M KOH solution H Bala, M Dymek, L Adamczyk, K Giza, H Drulis Journal of Solid State Electrochemistry 18 (11), 3039-3048 , 2014 2014 Citations: 33
Inhibition of LaNi 5 electrode decay in alkaline medium by electroless encapsulation of active powder particles M Dymek, H Bala Journal of Solid State Electrochemistry 20 (7), 2001-2007 , 2016 2016 Citations: 25
Corrosion degradation of powder composite hydride electrodes in conditions of long-lasting cycling H Bala, M Dymek Materials Chemistry and Physics 167, 265-270 , 2015 2015 Citations: 25
Electrochemical characterization of nanocrystalline hydrogen storage La1. 5Mg0. 5Ni6. 5Co0. 5 alloy covered with amorphous nickel M Dymek, M Nowak, M Jurczyk, H Bala Journal of Alloys and Compounds 780, 697-704 , 2019 2019 Citations: 23
Development of metal hydride material efficient surface in conditions of galvanostatic charge/discharge cycling H Bala, M Dymek, H Drulis Materials Chemistry and Physics 148 (3), 1008-1012 , 2014 2014 Citations: 23
Progress in evaluation of metal hydride electrode charge time and time of oxide phases reduction M Dymek, H Bala Ochrona Przed Korozją , 2013 2013 Citations: 18
Determination of corrosion rate of porous, liquid permeable materials on the example of hydride powder composite H Bala, M Dymek Ochrona przed Korozją , 2017 2017 Citations: 16
Hydrogen diffusivity in the massive LaNi 5 electrode using voltammetry technique M Dymek, H Bala Journal of Solid State Electrochemistry 18 (11), 3033-3037 , 2014 2014 Citations: 15
Electrochemical hydrogenation properties of LaNi4. 6Zn0. 4− xSnx alloys M Dymek, B Rozdzynska-Kielbik, VV Pavlyuk, H Bala Journal of Alloys and Compounds 644, 916-922 , 2015 2015 Citations: 14
Hydrogenation and electrochemical corrosion properties of LaNi4. 5Co0. 5 alloy doped with aluminum M Dymek, H Bala, A Hackemer, H Drulis Solid State Ionics 271, 116-120 , 2015 2015 Citations: 14
Effect of electrochemical cycling of LaNi5 powder composite material on hydrogen diffusivity at pressures of 0.08÷ 30 bar M Dymek, H Bala Ochrona Przed Korozją , 2013 2013 Citations: 13
Electrochemical Behavior of a Nanostructured La 1.25 Gd 0.25 Mg 0.5 Ni 7 Hydrogen Storage Material Modified with Magnetron Sputtered Nickel M Dymek, M Nowak, M Jurczyk, H Bala Journal of The Electrochemical Society 166 (8), A1393-A1399 , 2019 2019 Citations: 10
Hydrogenation and Corrosion Properties of LaNi 4.5 Co 0.5 -Based Alloy Doped with 1.7 at% Sn M Dymek, H Bala, H Drulis, A Hackemer Solid State Phenomena 227, 263-266 , 2015 2015 Citations: 10
Comparison of corrosion kinetics of metallic-and ionic materials for negative composite electrodes of NiMH type battery W Zayani, M Dymek, H Bala Ochr Przed Koroz 4, 100-105 , 2021 2021 Citations: 9
Preferential alkaline leaching of amphoteric elements from super-stoichiometric hydrogen storage alloy M Dymek, J Gega, P Pawlik, H Bala International Journal of Hydrogen Energy 45 (24), 13387-13397 , 2020 2020 Citations: 8
Reproducibility of the galvanostatic charge/discharge characteristics and the accuracy of determining the parameters of hydride electrode K Bordolińska, M Dymek, H Bala, H Drulis Ochrona przed Korozją , 2014 2014 Citations: 7
Peculiarities of LaNi5-powder/PVDF bonded composite–alkaline electrolyte interaction at repeating charge/discharge cycles M Dymek, A Mościcki, H Bala Ochrona przed Korozją , 2013 2013 Citations: 6
Electroless encapsulation of LaNi5 powder particles with Ni-P protective layers M Dymek, A Mościcki, M Sozańska, K Gęsiarz Ochrona przed Korozją , 2013 2013 Citations: 6
Determination of H2O/H2 system exchange current densities on cycled hydride electrodes from overswitch potential jump at low and high charge/discharge rates R Dahsa, M Dymek, YB Belgacem, J Lamloumi, C Khaldi, H Bala International Journal of Hydrogen Energy 48 (40), 15203-15214 , 2023 2023 Citations: 3