Nanocrystalline LaOx/NiO composite as high performance electrodes for supercapacitors,Dalton Transactions

当前位置： X-MOL 学术 › Dalton Trans. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Nanocrystalline LaOx/NiO composite as high performance electrodes for supercapacitors
Dalton Transactions ( IF 3.5 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1039/c7dt03815a
Guo Du _{1,

2,

3,

4} , Zifan Zeng _{1,

2,

3,

4} , Bangqing Xiao _{1,

2,

3,

4} , Dengzhi Wang _{1,

2,

3,

4} , Yuan Yuan _{1,

2,

3,

4} , Xiaohong Zhu _{1,

2,

3,

4} , Jiliang Zhu _{1,

2,

3,

4}

Affiliation

Nanocrystalline LaO_x/NiO composite electrodes were synthesized via two types of facile cathodic electrodeposition methods onto nickel foam followed by thermal annealing without any binders. Scanning electron microscopy and transmission electron microscopy investigation revealed that LaO_x nanocrystalline particles with an average diameter of 50 nm are uniformly distributed in the NiO layer or alternately deposited with the NiO layer onto the substrate. It is speculated that LaO_x particles can participate in the faradaic reaction directly and offer more redox sites. Besides this, the unique Ni/La layered structure facilitates the diffusion of ions and retards the electrode polarization, thus leading to a better rate capability and cycling stability of NiO. As a result, the obtained electrodes display very competitive electrochemical performance (a specific capacitance of 1238 F g⁻¹ at a current density of 0.5 A g⁻¹, excellent rate capability of 86% of the original capacitance at 10 A g⁻¹ and excellent cycling stability of 93% capacitance after 10 000 cycles). In addition, asymmetric coin devices were assembled using LaO_x/NiO as the positive electrode and active carbon as the negative electrode. The assembled asymmetric devices demonstrate a high energy density of 13.12 W h kg⁻¹ at a power density of 90.72 W kg⁻¹.

中文翻译：

纳米晶LaO _x / NiO复合材料作为超级电容器的高性能电极

纳米晶LaO _x / NiO复合电极通过两种类型的简便阴极电沉积方法合成到泡沫镍上，然后在没有任何粘合剂的情况下进行热退火。扫描电子显微镜和透射电子显微镜研究表明，平均直径为50nm的LaO _x纳米晶体颗粒均匀地分布在NiO层中或与NiO层交替沉积在基板上。据推测，LaO _x颗粒可以直接参与法拉第反应，并提供更多的氧化还原位点。除此之外，独特的Ni / La层状结构还促进了离子的扩散并延迟了电极极化，从而提高了NiO的定速能力和循环稳定性。其结果是，所获得的电极显示非常有竞争力的电化学性能（1238 F G的特定电容^-1以0.5 g的电流密度^-1在10甲克的原始电容的86％，优良的倍率性能^-1和10000次循环后具有93％电容的出色循环稳定性）。此外，使用LaO _x组装了不对称硬币设备/ NiO为正极，活性炭为负极。组装的不对称器件在功率密度为90.72 W kg ^-1时显示出13.12 W h kg ^-1的高能量密度。

更新日期：2017-11-20

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11