  As a result of experimental studies of the single-crystal iron-chalcogenide
compound FeTe0.65Se0.35, the effect of structural transitions caused by
hydrogen sorption on the magnetic and current-carrying properties of a
superconductor has been established. An increase in the volume-averaged
effective pinning potential (and the associated critical current density) after
the process of hydrogen sorption at temperatures up to 150 {\deg}C - 200
{\deg}C can be explained by the appearance of additional pinning centers due to
the local action of implanted H ions on its crystal structure and electronic
states. It was confirmed that hydrogenation is an efficient tool for increasing
flux pining properties of superconductors.
