Abstract:

Finding new energy has become the key to solving the energy and environmental problems. Hydrogen became the research focus because of its high energy efficiency and non-pollution. In recent years, Co₉S₈ is becoming a hot research topic with the excellent electrochemical hydrogen storage properties and high hydrogen storage capacity,but its anti-powering property still needs to be further improved. In this paper, TiO₂ with different mass fraction coated Co₉S₈ electrode materials were obtained by using sol-gel and calcination methods. X-ray diffraction spectra(XRD), scanning electron microscope(SEM) and electrochemical measurement system were used to analyze the composition and hydrogen storage capacity of coating materials. The effects of TiO₂ with different mass fractions on the electrochemical hydrogen storage performance were studied. The experimental results show that, when the mass fraction of TiO₂ is 3%, the hydrogen storage capacity and cycling stability of the product are disirable. The maximum hydrogen storage capacity of the product is 2.03%(mass fraction), along with a favorable cycling stability of 60% after 30 cycles.

Key words: Co₉S₈, TiO₂, coating, electrochemical hydrogen storage property