Page 7 - Дисертація_Влад_Христина_Ігорівна

ABSTRACT

Vlad Kh.I. Nanostructured materials based on Ni, Co, Fe: influence of

composition and structure on hydrogen sorption and catalytic properties.

Dissertation for the degree of Doctor of Philosophy in the field of knowledge

“13 – Mechanical Engineering” in the specialty “132 – Materials Science”. –

Karpenko Physico-Mechanical Institute of the National Academy of Sciences of

Ukraine, Lviv, 2025.

Dissertation is devoted to the investigation of the influence of composition and

structural–morphological features of nanostructured powders based on transition d-

metals (Ni, Co, Fe), intermetallic compounds and composites of the “intermetallic –

nanostructured metal additive” type on their hydrogen sorption, electrochemical and

catalytic properties. Particular attention is paid to the study of such nanomaterials as

active components in hydrogenation and dehydrogenation reactions, as well as

catalysts for the hydrolysis of sodium borohydride (NaBH ) and magnesium hydride
4
(MgH ).
2
The first chapter provides an analysis of the available scientific literature on

methods for synthesizing nanostructured materials, including chemical reduction,

leaching, laser ablation and pyrolysis. The chapter summarizes research findings

concerning the influence of morphology and structure of nanostructured and amorphous
nickel on its hydrogen sorption behavior. The application of metal hydrides and

nanostructured additives in chemical power sources is discussed. In addition, the
structure and electrochemical properties of alloys based on the R–Mg–Ni system are

highlighted. Special attention is given to the role of nanostructured materials on charge-
discharge processes of negative electrodes of Ni-MH batteries, as well as their potential

applications as catalysts for the hydrolysis of sodium borohydride and magnesium

hydride.

The second chapter of the dissertation presents a description of the starting

materials used, the synthesis methods applied and the experimental approaches

employed to study the structure, electrochemical behavior and catalytic properties of

the materials. The synthesis procedures for intermetallic compounds and
7