Abstract
The accumulation of electrolytic hydrogen synthesized in a 5 M KOH solution by double- and triple-walled carbon nanotubes (CNTs) deposited on a steel membrane and encapsulated by an electrolytic iron layer of the thickness of 10 nm was studied. CNTs were synthesized by catalytic pyrolysis of methane and are characterized by an inner diameter of 2–4 nm, a length of up to 10 μm and more, and a specific surface area of 600–800 m2 g–1. The studies were performed by electrochemical diffusion, cyclic voltamperometry, and electrochemical-impedance spectroscopy. It has been shown that the hydrogen-storage capacity in CNTs varies in the range of 4–25% depending on the content of nanotubes in the composite.
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