Preparation And Performance Of New Electrochemical Hydrogen Storage Materials

With a growing world population, an increasing standard of living in countries, and a limited supply of fossil fuels and its adverse effect on the environment, the need for clean and sustainable energy has never been greater. Hydrogen, the simplest and most abundant element in the universe, contains the highest energy density per unit mass, burns clean, producing only water, is considered as an ideal candidate to meet the need. As hydrogen storage is one of the key links in the process of hydrogen utilization, hydrogen storage materials have aroused widespread concerns of numerous researchers.Commercialization of Ni-MH battery is the most economic valuable research achievements of hydrogen storage materials’ utilization. Though some kinds of electrochemistry hydrogen storage materials, which are used as negative electrode materials for nickel-metal hydride batteries, have entered the commercialization stage, limited capacities of existing materials can hardly meet the growing requirements of society. Electrochemistry hydrogen storage materials with higher electrochemical hydrogen storage capacity and longer cycle life are expected to be found. Therefore, it is an extremely meaningful task of studying on materials with excellent properties of electrochemical hydrogen storage.In past decade, sulfide nanomaterials with various morphologies were proved to be with excellent electrochemical hydrogen storage properties, and potential Ni-MH battery’s anode materials. Nano-wavy morphology of CoS materials were prepared in a simple way. We find that the specific surface area of sample is119.0m2/g and pore volume is0.188cm3/g. The highest electrochemical hydrogen storage capacity is138mAh/g, along with the good electrochemical cycling performance. Sb-carbon materials were prepared by temperature programmed reduction method. Ionic liquid precursor [C8mim][Sb(OH)6] was calcined at500℃and700℃respectively. With increasing temperature, the content of C element decreased, the electrochemical hydrogen storage capacity increased while the electrochemical cycle performance decreased. The highest hydrogen storage capacities are178mAh/g and245mAh/g; On20th cycle, the former maintained44.9%, while the latter only17.5%.Mo2C material and MoOC nanomaterial were prepared by mixed method of temperature-programmed reduction method and liquid phase reaction method. Ionic liquid [Cimim]2[MoO4] was used as precursor and SBA-15as a template. The particle size of MoOC material is5nm, while Mo2C material particle size is20nm. The highest electrochemical hydrogen storage capacities are945mAh/g and1095mAh/g.