| Mo掺杂NiMnSe2的制备及其超级电容器性能 |
| Preparation and supercapacitor performance of Mo-doped NiMnSe2 |
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| 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NiMnSe2(记作Ni0.8Mo0.2MnSe2)。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NiMnSe2的电化学性能。在1 A·g-1时,Ni0.8Mo0.2MnSe2的比容量达到1 404.0 F·g-1。掺杂Mo显著降低了NiMnSe2的电荷转移电阻和扩散电阻。组装的混合超级电容器Ni0.8Mo0.2MnSe2//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10 000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Ni0.8Mo0.2MnSe2//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NiMnSe2//AC (17.3 Wh·kg-1)。 |
| 关键词: 混合超级电容器 过渡金属硒化物 一步水热法 |
| 基金项目: 天津市科技委员会科技特派员基金(No.2101/021573)资助。 |
| Abstract: In this work, we applied a simple hydrothermal method to grow a Mo-doped NiMnSe2 without binding reagent on the foam nickel (noted as Ni0.8Mo0.2MnSe2). Small amount of Mo substitution for Ni can provide rich reactive sites and therefore greatly enhances the electrochemical performance of NiMnSe2. The specific capacity of Ni0.8Mo0.2MnSe2 at 1 A·g-1 reached 1 404.0 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 Ni0.8Mo0.2MnSe2//AC (activated carbon) hybrid supercapacitor (HSC) delivered capacity of 81.6 F·g-1 and exhibited excellent rate performance. After 10 000 cycles at 2 A·g-1, the Ni0.8Mo0.2MnSe2//AC HSC maintained 95.8% of the capacity, indicating a high cycling stability. Under the power density of 376.6 W·kg-1, the Ni0.8Mo0.2MnSe2//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. |
| Keywords: hybrid supercapacitor transition metal selenide one-step hydrothermal method |
| 投稿时间：2022-11-15 修订日期：2023-04-20 |
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| 郝生阳,张雨婷,王晓清.Mo掺杂NiMnSe2的制备及其超级电容器性能[J].无机化学学报,2023,39(6):1091-1102. |
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