石墨烯含量对钒基储氢电池耐腐蚀性和吸放氢性能的影响

Effect of Graphene Content on the Corrosion Resistance and Hydrogen Adsorption-desorption Properties of the Vanadium-based Hydrogen Storage Battery

在VTi Ni钒基储氢电池中添加不同含量的石墨烯,测试和分析了显微组织、物相组成、吸放氢性能和耐腐蚀性能。结果表明:石墨烯的添加,明显提高了钒基储氢电池的吸放氢性能和耐腐蚀性能。随石墨烯含量的增加,钒基储氢电池的的腐蚀电位先正移后负移,最大吸氢量先增大后减小,吸氢量达到饱和的吸氢时间先减小后增大,放氢平台压力先基本不变后提高。石墨烯含量优选为1%,腐蚀电位较未添加石墨烯时正移了414 m V,最大吸氢量较未添加石墨烯时提高了24%,吸氢量达到饱和的吸氢时间较未添加石墨烯时缩短了44%。

The microstructure, phase composition, corrosion resistance, hydrogen adsorption and desorp- tion properties of the VTiNi vanadium-based hydrogen storage battery added with various contents of gra- phene were tested and analyzed in this paper. The results show that the graphene could significantly im- prove the corrosion resistance, hydrogen adsorption and desorption properties of the vanadium-based hy- drogen storage battery. With increasing the graphene content, the corrosion potential of the vanadium- based hydrogen storage battery first positively then negatively shifted, the maximum hydrogen adsorption content first increased then decreased, and the time for hydrogen adsorption to saturation first decreased then increased with the platform pressure of hydrogen desorption first basically unchanged then increased.With 1% of the optimum graphene content for the vanadium-based hydrogen storage battery, the corrosion potential positively shifted by 414 mV, the maximum hydrogen adsorption content increased by 24%, and the time for hydrogen adsorption to saturation decreased by 44%, respectively compared to that of the battery without adding graphene.