Controlled synthesis of three-phase NixSy/rGO nanoflake electrodes for hybrid supercapacitors with high energy and power density
Controlled synthesis of three-phase NixSy/rGO nanoflake electrodes for hybrid supercapacitors with high energy and power density
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DOI：
10.1016/j.nanoen.2017.01.056
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发表时间：
2017-03-01
期刊：
影响因子：
17.6
通讯作者：
Liu, Meilin
中科院分区：
文献类型：
--
作者：
Dai, Shuge;Zhao, Bote;Liu, Meilin
电极材料的组成设计和形貌控制是提高电化学储能装置比容量、倍率和循环寿命的有效策略。在这里，我们报告了我们在设计和合成三相硫化镍（NiS-Ni3S2-Ni3S4，表示为dp - nixsy）方面的发现，该材料具有由相互连接的纳米片组装而成的三维花状结构，在1 a g（-1）的电流密度下提供724 C g-1的比容量。当与还原氧化石墨烯（rGO）集成时，通过水热工艺得到的TP-NixSy/ rGO复合电极不仅具有更高的比容量（在1 a g-1时为807 C g-1），而且具有更好的倍率能力（当电流密度从1 a g-1增加到20 a g-1时，容量保持率达到72%）。此外，由TP-NixSy/ rGO正极和石墨烯负极组成的混合储能装置在1.8 kW kg（-1）的功率密度下显示出46 Wh kg（-1）的高能量密度。它在17.2 kW kg（-1）的功率密度下保持32 Wh kg（-1）的能量密度，证明了它在实际应用中的可行性和潜力。
Composition design and morphology control of electrode materials are effective strategies to enhance the specific capacity, rate capability, and cycling life of electrochemical energy storage devices. Here we report our findings in the design and synthesis of a three-phase nickel sulfide (NiS-Ni3S2-Ni3S4, denoted as TP-NixSy) with 3D flower-like architecture assembled from interconnected nanoflakes, which delivers a specific capacity of 724 C g-1 at a current density of 1 A g(-1). When integrated with reduced graphene oxide (rGO), a TP-NixSy/ rGO composite electrode, derived from a hydrothermal process, demonstrates not only higher specific capacity (807 C g-1 at 1 A g-1) but also better rate capability (similar to 72% capacity retention as the current density was increased from 1 to 20 A g-1). Moreover, a hybrid energy storage device, constructed from a TP-NixSy/ rGO positive electrode and a graphene-based negative electrode, shows a high energy density of 46 Wh kg(-1) at a power density of 1.8 kW kg(-1). It retains an energy density of 32 Wh kg(-1) at power density of 17.2 kW kg(-1), demonstrating its viability and potential for practical applications.