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采用共沉淀还原扩散法制备AB3型储氢合金LaMg_2Ni_(2.7)Co_(2.1)Mn_(2.7)Cu_(1.5),水热法制备TiO_2光催化剂粉体,表面滴涂法制备Ti O2/LaMg_2Ni_(2.7)Co_(2.1)Mn_(2.7)Cu_(1.5)光催化剂复合电极,并用XRD对合金和光催化剂结构进行分析,在电池测试仪上对复合电极在有、无光照条件下的电化学性能进行测试。结果表明,在无光照条件下复合电极的活化性能和最大放电容量较原合金电极性能有所下降,合金充放电的循环稳定性能有所提高。光照条件下,表面滴涂20%TiO_2复合电极的电化学性能比无光照时大幅提高,且最大放电容量比未涂覆的原合金电极提高25 m Ah·g~(-1)。说明TiO_2光催化剂通过表面滴涂方式对储氢合金修饰效果较好。
ABM hydrogen storage alloy LaMg_2Ni_ (2.7) Co_ (2.1) Mn_ (2.7) Cu_ (1.5) was prepared by coprecipitation reduction and diffusion method. TiO_2 photocatalyst powder was prepared by hydrothermal method and Ti O2 / LaMg_2Ni 2.7 ) Co_ (2.1) Mn_ (2.7) Cu_ (1.5) photocatalyst composite electrode, and the structure of the alloy and the photocatalyst was analyzed by XRD. The electrochemical performance of the composite electrode was tested in the presence and absence of light on a battery tester. The results show that the activation performance and the maximum discharge capacity of the composite electrode are lower than those of the original alloy in the absence of light, and the cycling stability of the alloy is improved. Under the illumination condition, the electrochemical performance of the 20% TiO 2 composite electrode dropped greatly compared with that of the uncoated electrode, and the maximum discharge capacity increased by 25 mA · g -1 than that of the uncoated electrode. It shows that TiO 2 photocatalyst has a good effect on the modification of hydrogen storage alloy by surface-drop coating.