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Information × Registration Number 0224U033483, (0123U102985) , R & D reports Title Synthesis of new hydrogen sorption composites with nanoporous additions based on Co and Fe popup.stage_title Електрохімічні та воденьсорбційні властивості композитів Head Vlad Khrystyna I., молодший науковий співробітник Registration Date 28-12-2024 Organization Physico-Mechanical Institute named after GV Karpenko of the National Academy of Sciences of Ukraine popup.description1 Synthesis of new hydrogen sorption composites with porous nanoadditives with improved charge-discharge and hydrolysis properties. popup.description2  The main electrochemical parameters were determined: maximum discharge capacity, cyclic stability, and high-rate dischargeability (HRD). The maximum discharge capacities for Co50Fe50, Co25Fe75, and Ni50Fe50 were 331, 357, and 182 mAh/g, respectively. Alloys based on Co, Ni, and Co75Fe25 exhibited the best anti-corrosion properties. It was established that a lower Fe content in the alloys improves their electrochemical parameters. Composite materials based on metal hydrides with nanodopants were developed, demonstrating a significant enhancement in electrochemical characteristics. The discharge capacity of the composites exceeded the corresponding values for intermetallic alloys by 2–4 times. High cyclic stability during charge-discharge cycles was achieved through the optimization of the composite compositions. These materials show great promise for use in high-performance energy storage systems. The influence of catalytic additives on the hydrogenation rate of magnesium during reactive milling in hydrogen is minimal. Exceptions are the Co25Fe75 and Co50Fe50 additives, which accelerate hydrogenation. The addition of catalytic additives also facilitates the production of a highly dispersed powder with an average particle size of <1 μm. Furthermore, in almost all studied composites, no agglomeration of the powder particles occurs, which collectively has a positive effect on the hydrolytic hydrogen production. Hydrolysis of the composites demonstrated a high degree of hydrogen conversion when using MgCl2 solutions. At its maximum concentration of 0.1 mol/L, the conversion degree for all composites remained at 85-96% over 90 minutes of the reaction. It was also shown that with an increase in the amount of Co or Ni in the Co-Fe and Ni-Fe additives, respectively, the degree of hydrolysis conversion decreases. Product Description popup.authors Vlad Khrystyna I. Kononiuk Oleksandr P. popup.nrat_date 2024-12-28 Close