[en] The main idea of this experiment is to use hydrogen as an electron donor to change the carrier concentration in high-Tc superconductors. The dependence of the superconducting properties, in particular the superconducting transition temperature on the carrier concentration is of great importance for the understanding of the pairing mechanism in these materials. In this work, the effect of hydrogen charging on the electrical resistivity, the change of the superconducting transition temperature and the Hall number was studied. We find that the concentration of charge carriers is strongly reduced by hydrogen doping. The data can be understood assuming that hydrogen compensates the (hole) charge carriers in YBaCuO. In contrast, the superconducting transition temperature is not much affected by H-doping in the concentration range studied. (orig.)