NOVELTY - Reactor vessel for generating hydrogen comprises: (a) a first inlet adapted to supply a hydrogen precursor material into the reactor vessel; (b) a second inlet adapted to supply a catalyst precursor material into the reactor vessel; and (c) a third inlet adapted to feed water back into the reactor vessel; or reactor vessel for generating hydrogen comprises: (a) a first inlet adapted to receive a hydrogen precursor material; (b) a second inlet adapted to receive a catalyst precursor material; and (c) an agitating means arranged within the reactor vessel.    USE - The reactor vessel is useful for generating hydrogen (claimed).    ADVANTAGE - The invention provides hydrogen generation system that has increased hydrogen generation capacity and efficiency.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a method for generating hydrogen comprising: (a) reacting a hydrogen precursor material with a catalyst precursor material or a catalyst within a reactor vessel under agitation to generate hydrogen; and (b) removing the reaction mixture produced by the hydrogen generation reaction via at least one outlet of the reactor vessel, where the agitating and removing are carried out using an agitating means arranged within the reactor vessel; and    (2) a system for generating hydrogen comprising: (a) a reactor vessel; (b) a hydrogen precursor material storage means for supplying the hydrogen precursor material into the reactor vessel via a first pump, where the first pump is connected between the reactor vessel and the hydrogen precursor material storage means; (c) a catalytic precursor material storage means for supplying the catalytic precursor material into the reactor vessel via a second pump, where the second pump is connected between the reactor vessel and the catalytic precursor material storage means; (d) a water storage means for feeding water back into the reactor vessel via a third pump, where the third pump is connected between the reactor vessel and the water storage means; (e) a container for storing the reaction mixture generated by the hydrogen generation reaction via an outlet of the reactor vessel; and (f) a condenser for separating the water from the reaction mixture, where the condenser is connected between the container and the water storage means.