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为提高La-Mg-Ni基储氢合金La_(0.73)Ce_(0.18)Mg_(0.09)Ni_(3.20)Al_(0.21)Mn_(0.10)Co_(0.60)的电化学性能,将制备的石墨烯添加到储氢合金中。经XRD分析可知,处理前后合金的相结构没有变化。添加质量分数为1%、2%、5%石墨烯的合金电极与未添加石墨烯电极相比,最大放电容量略有下降,但50次循环后的放电容量保持率从63%分别提高到75%、78%和73%。添加2%石墨烯电极和未添加石墨烯电极相比,900 m A/g放电电流密度下的高倍率放电容量保持率从79.8%增加到83.9%,交换电流密度I0从54 m A/g提高到281 m A/g,极限电流密度IL从512 m A/g提高到1 537 m A/g。加入石墨烯后,电极的抗腐蚀性能也明显增强。
In order to improve the electrochemical performance of La_ (0.73) Ce_ (0.18) Mg_ (0.09) Ni_ (3.20) Al_ (0.21) Mn_ (0.10) Co_ (0.60) of La-Mg-Ni based hydrogen storage alloy, the prepared graphene was added To hydrogen storage alloy. The XRD analysis shows that the alloy phase structure before and after treatment did not change. The maximum discharge capacity of the alloy electrode with 1%, 2%, 5% graphene added slightly decreased compared with that without graphene electrode, but the discharge capacity retention after 50 cycles increased from 63% to 75 %, 78% and 73%. Compared with the non-graphene electrode, the high-rate discharge capacity retention at 900 m A / g discharge current density increased from 79.8% to 83.9% and the exchange current density I0 increased from 54 m A / g At 281 m A / g, the limiting current density, IL, increased from 512 m A / g to 1337 m A / g. After adding graphene, the corrosion resistance of the electrode is also significantly enhanced.