Interface polarization matters: Enhancing supercapacitor performance of spinel NiCo2O4 nanowires by reduced graphene oxide coating
Interface polarization matters: Enhancing supercapacitor performance of spinel NiCo2O4 nanowires by reduced graphene oxide coating
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界面极化问题：通过还原氧化石墨烯涂层增强尖晶石 NiCo2O4 纳米线的超级电容器性能
DOI：
10.1016/j.electacta.2017.12.044
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发表时间：
2018
影响因子：
6.6
通讯作者：
Du Youwei
中科院分区：
文献类型：
--
作者：
Zhang Cheng;Lei Chenglong;Cen Chao;Tang Shaolong;Deng Mingsen;Li Yuliang;Du Youwei
超级电容器显示出超快的充放电速率，但具有极高的功率，可以满足新兴的能源需求，特别是对于高比功率和便携式能量转换/存储设备。本文报道了一种基于NiCo 2 O 4纳米线和还原氧化石墨烯（rGO）互补组分的新型混合电极材料，该材料通过结合电容和法拉第材料以及存储机制，用于高性能超级电容器应用。独特的异质结构rGO/NiCo 2 O 4纳米结构表现出高比电容（高达4.37 F cm−2（1248 F g−1），在2 mA cm− 2的电流密度下测量，活性材料负载量为3.5 mg cm−2）和优异的循环稳定性，在2000次充放电循环后电容保持率为90%，以及高倍率性能。由于功函数的差异，界面极化不仅使电解质离子在rGO表面有效吸附/脱附，提高了电化学双电层电容（EDLC），而且提供了电解质离子的储存位点和传输途径，促进了NiCo 2 O 4表面附近的法拉第氧化还原反应。令人鼓舞的结果表明，这种混合纳米结构结合电容和法拉第材料和存储机制在开发高性能电化学超级电容器方面具有巨大的潜力。
Supercapacitors show ultrafast charging-discharging rates but extremely high powers that can address emerging energy needs, in particular for the high specific power and portable energy conversion/storage devices. Herein, we report a novel hybrid electrode material based on complementary components of NiCo2O4nanowires and reduced graphene oxide (rGO) for high performance supercapacitor application by combining capacitive and faradaic materials and storage mechanisms. The unique heterostructured rGO/NiCo2O4nanostructures exhibit high specific capacitance (up to 4.37 F cm−2(1248 F g−1), measured at the current density of 2 mA cm−2with loading of active materials 3.5 mg cm−2) and excellent cycling stability with capacitance retention of 90% after 2000 charge-discharge cycles as well as high rate capability. Due to the difference of work function, the interfacial polarization not only allow the effective adsorption/desorption of the electrolyte ions at the surface of rGO to improve electrochemical double-layer capacitance (EDLC), but also provide both electrolyte ions storage site and transport pathway to facilitate the Faradaic redox reactions near the surface of NiCo2O4. The encouraging results show that such hybrid nanostructure combining capacitive and faradaic materials and storage mechanisms have great potential in developing high performance electrochemical supercapacitors.
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影响因子：
16.6
作者：
Yuan, Changzhou;Wu, Hao Bin;Lou, Xiong Wen (David)
通讯作者：
Lou, Xiong Wen (David)
影响因子：
6.6
作者：
Yunya Zhang;Zan Gao;Ningning Song;Xiaodong Li
通讯作者：
Yunya Zhang;Zan Gao;Ningning Song;Xiaodong Li
影响因子：
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作者：
Jianfeng Zang;Xiaodong Li
通讯作者：
Jianfeng Zang;Xiaodong Li
影响因子：
10.8
作者：
Rakhi, R. B.;Chen, Wei;Alshareef, H. N.
通讯作者：
Alshareef, H. N.
影响因子：
6.6
作者：
Gao, Zan;Zhang, Yunya;Li, Xiaodong
通讯作者：
Li, Xiaodong