TiO_2包覆Co_9S_8的制备及其电化学储氢性能

Preparation and Electrochemical Hydrogen Storage Properties of TiO_2 Coated Co_9S_8

目前,寻找新型能源成为解决能源和环境问题的关键,氢能以其高效能、无污染等优点成为研究重点。其中,开发具有高储氢量和优异循环稳定性的新材料是利用氢能的重要研究方向。近些年,Co_9S_8凭借其优良的电化学储氢性能和较高的储氢容量成为目前研究热点,但其抗粉化性能仍有待于进一步提高。本文采用溶胶凝胶法和煅烧法得到了不同质量分数TiO_2包覆Co_9S_8的电极材料,利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和电化学测试系统分析包覆材料组成与性能,研究不同质量分数的TiO_2对材料电化学储氢性能的影响。结果表明,当TiO_2质量分数为3%时,产物的储氢性能和循环稳定性最好,最大储氢容量(质量分数)为2.03%,且经过30次充放电后,其放电容量仍能保持在60%。

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.