Electrochemical characterization of nanocrystalline hydrogen storage La1.5Mg0.5Ni6.5Co0.5 alloy covered with amorphous nickel
Source abstract
Abstract
Abstract Nanocrystalline hydrogen storage La1.5Mg0.5Ni6.5Co0.5 alloy was obtained by mechanical alloying and heat treatment (850 °C/0.5 h). The A2B7 phase is dominant in so synthesized material. Concentration of AB5 phase is close to 3 at. % and is 2.6 times lower than that in Co-free La1.5Mg0.5Ni7 alloy. The La1.5Mg0.5Ni6.5Co0.5 powder fraction of 20–50 μm was encapsulated with thin (0.48 μm thick), amorphous nickel by magnetron sputtering. The electrochemical charge/discharge multicycling of powder composite electrodes was carried out in view of material potential usefulness as electrode material for Ni/MHx batteries. Partial substitution of Ni by Co in La1.5Mg0.5Ni7 nanocrystalline alloy is prone to increase of electrode discharge capacity (up to 14%) and enhances its activation (strong decrease of Nmax cycle and simultaneous increase of Q N max ). On the other hand, Co addition worsens corrosion degradation behavior, but the corrosion resistance can be improved (≈30%) by the application of amorphous nickel coating. Finally, Co modified La1.5Mg0.5Ni7 nanocrystalline alloy reveals 15% greater exchange current density of H2O/H2 system and improved hydrogen diffusivity compared to the reference, nanocrystalline Co-free La1.5Mg0.5Ni7 hydrogen storage material.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Hydrogen Storage and Materials · Hybrid Renewable Energy Systems · Electrocatalysts for Energy Conversion
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (33)
Show source-provided references
1. Phase relations and hydrogen absorption in the lanthanum-nickel system10.1016/0022-5088(72)90191-9 ↗
2. Hydrogenation and electrochemical studies of La-Mg-Ni alloys10.1016/j.ijhydene.2016.05.220 ↗
3. Nanoscale Mg-based materials for hydrogen storage10.1016/j.ijhydene.2007.07.022 ↗
4. Encapsulation of La1.5Mg0.5Ni7 nanocrystalline hydrogen storage alloy with Ni coatings and its electrochemical characterization10.1016/j.jallcom.2018.03.230 ↗
5. Hydrogen storage and electrochemical properties of mechanically alloyed La1.5-xGdxMg0.5Ni7 (0≤x≤1.5)10.1016/j.ijhydene.2018.03.130 ↗
6. Nanotechnology for the storage of hydrogen - chapter19
7. 2018
8. Effect of magnesium on the crystal transformation and electrochemical properties of A2B7-type metal hydride alloys10.1149/2.0641412jes ↗
9. Varin · 2009
10. Novel intermetallic hydrides10.1016/j.jallcom.2005.04.190 ↗
11. Phase structures and electrochemical properties of La–Mg–Ni-based hydrogen storage alloys with superlattice structure, review10.1016/j.ijhydene.2016.08.149 ↗
12. Recent progress in hydrogen storage alloys for nickel/metal hydride secondary batteries, review10.1016/j.ijhydene.2009.03.023 ↗
13. A study on the structural and electrochemical properties of La0.7−xNdxMg0.3Ni2.45Co0.75Mn0.1Al0.2 (x = 0.0-3.0) hydrogen storage alloys10.1016/j.jallcom.2007.03.009 ↗
14. The effect of Nd content on the electrochemical properties of low-Co La–Mg–Ni-based hydrogen storage alloys10.1016/j.jallcom.2007.03.106 ↗
15. Phase structures and electrochemical properties of La–Mg–Ni-based hydrogen storage alloys with superlattice structure10.1016/j.ijhydene.2016.08.149 ↗
16. The electronic and electrochemical properties of the LaNi5, LaNi4Al and LaNi3AlCo systems10.1016/S0925-8388(00)00843-4 ↗
17. Effect of Co content on the structure and electrochemical properties of La1.5Mg0.5Ni7−xCox (x = 0, 1.2, 1.8) hydrogen storage alloys10.1016/j.jallcom.2005.10.095 ↗
18. Investigation on the characteristics of La0.7Mg0.3Ni2.65Mn0.1Co0.75+x (x = 0.00-0.85) metal hydride electrode alloys for Ni/MH batteries10.1016/j.jallcom.2004.06.044 ↗
19. Effects of Fe-substitution for cobalt on electrochemical properties of La-Mg-Ni based alloys10.1016/S1002-0721(09)60099-5 ↗
20. The electrochemical hydrogen storage performances of Si added La-Mg-Ni-Co-based A2B7-type electrode alloys10.1007/s12598-013-0053-x ↗
21. Electrochemical hydrogen storage characteristics of the as-cast and annealed La0.8-xNdxMg0.2Ni3.35Al0.1Si0.05 (x = 0-0.4) electrode alloys10.1016/S1875-5372(14)60011-4 ↗
22. Determination of corrosion rate of porous, liquid permeable materials on the example of hydride powder composite
23. Development of metal hydride material efficient surface in conditions of galvanostatic charge/discharge cycling10.1016/j.matchemphys.2014.09.011 ↗
24. Inhibition of LaNi5 electrode decay in alkaline medium by electroless encapsulation of active powder particles10.1007/s10008-016-3203-x ↗
25. Corrosion degradation of powder composite hydride electrodes in conditions of long-lasting cycling10.1016/j.matchemphys.2015.10.042 ↗
26. Determination of hydrogenation ability and exchange current of H2O/H2 system on hydrogen absorbing metal alloys10.1007/s10800-009-0058-1 ↗
27. Evaluation of the electrochemical hydrogenation and corrosion behaviour of LaNi5-based materials using galvanostatic charge/discharge measurements10.1016/j.ijhydene.2012.07.126 ↗
28. Hydrogen diffusivity, Kinetics of H2O/H2 charge transfer and corrosion properties of LaNi5 powder, composite electrodes in 6M KOH solution10.1007/s10008-013-2322-x ↗
29. Electrochemical determination of the diffusion coefficient of hydrogen through an LaNi4.25Al0.75 electrode in alkaline aqueous solution10.1149/1.2050076 ↗
30. Electrochemical study of cobalt-free AB5-type hydrogen storage alloys10.1016/S0360-3199(03)00157-5 ↗
31. Effect of alloy composition on hydrogen diffusion in the AB5-type hydrogen storage alloys10.1016/0022-0728(95)04253-7 ↗
32. Hydrogen diffusion in the anode of Ni/MH secondary batteries10.1016/j.jpowsour.2004.03.015 ↗
33. Hydrogenation and corrosion properties of LaNi4.5Co0.5 based alloy doped with 1.7at% Sn10.4028/www.scientific.net/SSP.227.263 ↗