CAJ | 학술논문

将不同含量的Co3O4(2%,4%,6%,8%,质量分数)作为添加剂加入到储氢合金中,采用机械混合法进行改性处理.对添加Co3O4的合金电极的电化学性能和电极过程进行研究.结果表明:放电容量有了较大增加,添加2%、4%、6%、8% Co3O4的电极放电容量比空白电极容量分别增加0.83%,4.86%,7.18%和9.21%.线性极化曲线和电化学阻抗谱测试表明,添加Co3O4降低了电极的电荷转移电阻.循环伏安、扫描电镜和EDS测试表明,添加的Co3O4可部分溶解,发生Co-Co(OH)2可逆氧化一还原反应,从而改善储氢合金的电化学性能.
장불동함량적Co3O4(2%,4%,6%,8%,질량분수)작위첨가제가입도저경합금중,채용궤계혼합법진행개성처리.대첨가Co3O4적합금전겁적전화학성능화전겁과정진행연구.결과표명:방전용량유료교대증가,첨가2%、4%、6%、8% Co3O4적전겁방전용량비공백전겁용량분별증가0.83%,4.86%,7.18%화9.21%.선성겁화곡선화전화학조항보측시표명,첨가Co3O4강저료전겁적전하전이전조.순배복안、소묘전경화EDS측시표명,첨가적Co3O4가부분용해,발생Co-Co(OH)2가역양화일환원반응,종이개선저경합금적전화학성능.
Anodic electrodes with the mixture of hydrogen storage alloys and different contents of Co3O4 (2％,4％,6％ and 8％,mass fraction) powders were made.The effects of Co3O4 on the electrochemical performance of the alloy electrodes were studied.The constant charge-discharge tests show that the discharge capacity of alloy electrodes with Co3O4 significantly increases,and the maximum discharge capacities of electrodes with 2％,4％,6％ and 8％ Co3O4 are higher than the electrode with no Co3O4 by 0.83％,4.86％,7.18％ and 9.21％,accordingly.Linear polarization (LP) and electrochemical impedance spectroscopy (EIS) tests suggest that charge-transfer resistance decreases by the addition of Co3O4.Cyclic voltammogram (CV),scanning electron microscopy (SEM) and energy dispersive spectrum (EDS) tests indicate that Co3O4 can partly dissolve and experience a reversible oxidation-reduction process of Co to Co (OH)2,leading to the improvement in the electrochemical performance of hydrogen storage alloy.