Mo掺杂NiMnSe_(2)的制备及其超级电容器性能  

Preparation and supercapacitor performance of Mo-doped NiMnSe_(2)

作　　者：郝生阳 张雨婷 王晓清[1] HAO Sheng‑Yang;ZHANG Yu‑Ting;WANG Xiao‑Qing(College of Chemical Engineering and Technology,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学化学工程与技术学院,天津300387

出　　处：《无机化学学报》2023年第6期1091-1102,共12页Chinese Journal of Inorganic Chemistry

基　　金：天津市科技委员会科技特派员基金(No.2101/021573)资助。

摘　　要：成分和结构是影响多元过渡金属硒化物电化学活性的关键因素。适当掺杂其他金属元素可以有效提高电极材料的电化学性能。通过简单的一步水热法,在泡沫镍上制备出了一种无黏结剂的Mo掺杂NiMnSe_(2)(记作Ni_(0.8)Mo_(0.2)MnSe_(2))。Mo的少量掺杂为电极材料提供了丰富的反应活性位点,大大提高了NiMnSe_(2)的电化学性能。在1 A·g^(-1)时,Ni_(0.8)Mo_(0.2)MnSe_(2)的比容量达到1404.0 F·g^(-1)。掺杂Mo显著降低了NiMnSe_(2)的电荷转移电阻和扩散电阻。组装的混合超级电容器Ni_(0.8)Mo_(0.2)Mn Se_(2)//AC(活性炭)比容量达到81.6 F·g^(-1),且倍率性能优异。在2 A·g^(-1)下连续充放电10000周,容量保持率为95.8%,表现出超高的循环稳定性。混合超级电容器Ni_(0.8)Mo_(0.2)MnSe_(2)//AC在376.6 W·kg^(-1)的功率密度下,能量密度达25.5 Wh·kg^(-1),高于NiMnSe_(2)//AC(17.3 Wh·kg^(-1))。In this work,we applied a simple hydrothermal method to grow a Mo-doped NiMnSe_(2)without binding reagent on the foam nickel(noted as Ni_(0.8)Mo_(0.2)MnSe_(2)).Small amount of Mo substitution for Ni can provide rich reactive sites and therefore greatly enhances the electrochemical performance of NiMnSe_(2).The specific capacity of Ni_(0.8)Mo_(0.2)MnSe_(2)at 1 A·g^(-1)reached 1404.0 F·g^(-1).Mo substitution can also decrease the charge transfer resistance and diffusion resistance as well as improve the stability of the material structure.The Ni_(0.8)Mo_(0.2)MnSe_(2)//AC(activated carbon)hybrid supercapacitor(HSC)delivered capacity of 81.6 F·g^(-1)and exhibited excellent rate performance.After 10000 cycles at 2 A·g^(-1),the Ni_(0.8)Mo_(0.2)MnSe_(2)//AC HSC maintained 95.8%of the capacity,indicating a high cycling stability.Under the power density of 376.6 W·kg^(-1),the Ni_(0.8)Mo_(0.2)MnSe_(2)//AC HSC showed an energy density of 25.5 Wh·kg^(-1),higher than those of other similar supercapacitor,implying a high energy storage ability.

关 键 词：混合超级电容器 过渡金属硒化物 一步水热法 

分 类 号：TM53[电气工程—电器]