<br>一步水热合成MoO2/MoS2纳米复合材料作为高性能超级电容器电极材料,ACS Applied Materials & Interfaces

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一步水热合成MoO2/MoS2纳米复合材料作为高性能超级电容器电极材料
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-10-31 , DOI: 10.1021/acsami.2c11244
Yakun Deng ₁ , Youjun Zhao ₁ , Kangliang Peng ₁ , Lixin Yu ₁

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仅改变Mo与S源的比例，通过简单的一步水热法，以CH ₄ N ₂ S为硫，获得独特的单相MoO ₂或MoS ₂以及MoO ₂ /MoS ₂纳米复合材料(NCs)源和(NH ₄ ) ₆ Mo ₇ O ₂₄ ·4H ₂ O作为草酸中的Mo源。系统研究了Mo、S源配比对材料成分、结构和电化学性能的影响。由于其独特的设计，MoO ₂ /MoS ₂ NCs 中丰富的大孔活性位点具有优异的倍率特性（从 1 A g ^–1到 20 的电容保持率为 55.30%）和更大的比电容（1 A g –1 时为 1667.3 F g ^–1 ^{） 1} ）和直接用作电极时更长的循环寿命（5000次循环后为94.75%）。此外，在功率密度为225 W kg ^–1时，非对称超级电容器（MoO ₂ /MoS ₂ //AC）提供21.85 Wh kg ^–1的最大能量密度。非对称超级电容器（ASC）在电流密度1.5 A g ^–1下循环5000次后，电容显着增强129.02%，表现出优异的循环性能。这些结果表明所制备的MoO ₂ /MoS ₂ NCs在先进储能领域具有广阔的应用前景。重要的是，应该注意的是，氧化物和硫化物的NC仅通过简单的一步法制备。

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One-Step Hydrothermal Synthesis of MoO2/MoS2 Nanocomposites as High-Performance Electrode Material for Supercapacitors

By only changing the ratio of Mo to S source, a distinctive single phase MoO₂ or MoS₂ and MoO₂/MoS₂ nanocomposites (NCs) are obtained through a simple one-step hydrothermal method based on CH₄N₂S as a sulfur source and (NH₄)₆Mo₇O₂₄·4H₂O as a source of Mo in oxalic acid. The effect of ratio of Mo to S source on the composition, structure, and electrochemical performance are systematically researched. Due to its unique design, abundant macropores active sites in MoO₂/MoS₂ NCs induce superior rate property (55.30% capacitance retention to 20 from 1 A g^–1) and larger specific capacitance (1667.3 F g^–1 at 1 A g^–1) and longer cycle life (94.75% after 5000 cycles) as used directly as an electrode. Furthermore, at a power density of 225 W kg^–1, a maximal energy density of 21.85 Wh kg^–1 is provided by the asymmetric supercapacitor (MoO₂/MoS₂//AC). The capacitance of asymmetric supercapacitor (ASC) is remarkably enhanced by 129.02% under 5000 cycles at a current density of 1.5 A g^–1, demonstrating outstanding cycle property. These results imply the prepared MoO₂/MoS₂ NCs have promising applications in advanced energy storages. It is important and should be noted that NCs of oxide and sulfide are prepared with only a simple one-step process.

更新日期：2022-10-31

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