Novel Metal@Carbon Spheres Core-Shell Arrays by Controlled Self-Assembly of Carbon Nanospheres: A Stable and Flexible Supercapacitor Electrode
Novel Metal@Carbon Spheres Core-Shell Arrays by Controlled Self-Assembly of Carbon Nanospheres: A Stable and Flexible Supercapacitor Electrode
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DOI：
10.1002/aenm.201401709
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发表时间：
2015-03-18
影响因子：
27.8
通讯作者：
Fan, Hong Jin
中科院分区：
文献类型：
--
作者：
Xia, Xinhui;Zhang, Yongqi;Fan, Hong Jin
电化学储能装置的高性能在很大程度上依赖于纳米结构的严格设计和定制活性材料的智能混合。碳纳米球（CNS）广泛用于能量存储和转换装置。在这里，报道了中枢神经系统在垂直金属支架上定向组装成核/壳阵列结构。该方法采用三步全溶液合成策略（化学浴沉积、电沉积和水热），并从 ZnO 微棒阵列作为牺牲模板开始。 CNS 的自组装可以与伴随葡萄糖前体聚合的 ZnO 的同时蚀刻效应相关。选择 Ni 微管/CNS 阵列作为结构和电化学表征的示例。新型金属/CNS阵列被证明是一种高度稳定的超级电容器电极。金属/CNS阵列的电极组装成对称超级电容器，具有227 F g(-1)（2.5 A g(-1)）的高电容和出色的循环稳定性，40 000次循环后电容保持率为97%。
The high performance of electrochemical energy-storage devices relies largely on scrupulous design of nanoarchitectures and smart hybridization of bespoke active materials. Carbon nanopsheres (CNSs) are widely used for energy storage and conversion devices. Here, the directional assembly of CNSs on a vertical-standing metal scaffold into a core/shell array structure is reported. The method uses a three-step all-solution synthesis strategy (chemical bath deposition, electrodeposition, and hydrothermal) and begins from ZnO microrod arrays as a sacrificial template. The self-assembly of CNSs can be correlated to a simultaneous etching effect to the ZnO accompanying the polymerization of glucose precursor. The Ni microtube/CNSs arrays are selected as an example for structural and electrochemical characterizations. The novel type of metal/CNSs arrays is demonstrated to be a highly stable electrode for supercapacitors. The electrodes of metal/CNSs arrays are assembled into symmetric supercapacitors and exhibit high capacitances of 227 F g(-1) (at 2.5 A g(-1)) and an outstanding cycling stability with capacitance retention of 97% after 40 000 cycles.