Nanoflaky nickel-hydroxide-decorated phase-change microcapsules as smart electrode materials with thermal self-regulation function for supercapacitor application
Nanoflaky nickel-hydroxide-decorated phase-change microcapsules as smart electrode materials with thermal self-regulation function for supercapacitor application
复制标题
纳米片氢氧化镍修饰相变微胶囊作为具有热自调节功能的智能电极材料用于超级电容器
DOI：
10.1016/j.renene.2021.04.089
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发表时间：
2021
期刊：
影响因子：
8.7
通讯作者：
Wang Xiaodong
中科院分区：
文献类型：
--
作者：
Sun Zhao;Han Zhaoteng;Liu Huan;Wu Dezhen;Wang Xiaodong
设计了一种纳米片状氢氧化镍修饰相变微胶囊体系[Ni(OH)2-SiO2-MEPCM]，作为超级电容器的智能电极材料。该体系是通过将正十二烷核微包埋在硅壳-乳液模板界面缩聚中构建的，然后通过结构定向界面沉淀在硅壳表面制备纳米片状Ni(OH)2层。这种相变微胶囊与电化学活性材料的结合使得Ni(OH)2-SiO2-MEPCM同步实现热自我调节和电化学储能。Ni(OH)2-SiO2-MEPCM具有完美的核壳结构和清晰的纳米片状表面微观结构。Ni(OH)2-SiO2-MEPCM不仅具有良好的温度调节能力，潜热容量约为140 J/g，而且具有良好的热循环稳定性和高温形状稳定性。最重要的是，与传统的电极材料相比，Ni(OH)2-SiO2-MEPCM作为超级电容器的电极材料，可以通过其单质核进行有效的热自调节来调节微环境温度，从而提高了电化学性能和良好的长期循环稳定性，在50℃的高环境温度下，经过3000次充放电循环，电容保持率为86.2%。所有这些特征表明，本工作开发的Ni(OH)2-SiO2-MEPCM作为电化学储能智能电极材料具有很大的潜力。
A nanoflaky nickel-hydroxide-decorated phase-change microcapsule system [designated as Ni(OH)2-SiO2-MEPCM] was designed as a smart electrode material for supercapacitor application. This system was constructed through microencapsulatingn-docosane core into a silica shellviaemulsion-templated interfacial polycondensation, followed by fabricating a nanoflaky Ni(OH)2layer on the surface of silica shell through structure-directed interfacial precipitation. Such a combination of phase-change microcapsules and electrochemically active material makes the Ni(OH)2-SiO2-MEPCM synchronously implement thermal self-regulation and electrochemical energy storage. The Ni(OH)2-SiO2-MEPCM shows a perfect core-shell structured morphology and well-defined nanoflaky surface microstructure. The Ni(OH)2-SiO2-MEPCM not only possesses a good temperature regulation capability with a latent-heat capacity of around 140 J/g but also exhibits an excellent thermal cycle stability and good high-temperature shape stability. Most importantly, compared to traditional electrode materials, the Ni(OH)2-SiO2-MEPCM can perform effective thermal self-regulation to regulate the micro-ambient temperature by itsn-docosane core when used as an electrode material for supercapacitors, leading to improved electrochemical performance and good long-term cycle stability with capacitance retention of 86.2% after 3000 charge-discharge cycles at a high ambient temperature of 50 °C. All of these features indicate that the Ni(OH)2-SiO2-MEPCM developed by this work has great potential as a smart electrode material for electrochemical energy-storage applications.