Synthesis and electrochemical performance of Co1−xNixS QDs as electrode materials for high performance supercapacitors,Sustainable Energy & Fuels

当前位置： X-MOL 学术 › Sustain. Energy Fuels › 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.)

Synthesis and electrochemical performance of Co1−xNixS QDs as electrode materials for high performance supercapacitors
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-04-24 , DOI: 10.1039/d0se00366b
Mingyan Chuai _{1,

2,

3,

4} , Hongpeng Zhang _{1,

2,

3,

4} , Yu Tong _{1,

2,

3,

4} , Kewei Zhang _{1,

2,

3,

4} , Mingzhe Zhang _{1,

2,

3,

4}

Affiliation

Co_1−xNi_xS quantum dots (QDs), which exhibit outstanding electrochemical properties, are successfully synthesized by a solution diffusion synergistic capture doping method. A larger surface area of Co_1−xNi_xS QDs, which can provide more electroactive sites and promote ion exchange in the electrolyte solution, is beneficial to improve their electrochemical performance. Co_1−xNi_xS (x = 0.58) QDs as a high-performance supercapacitor electrode for supercapacitors deliver not only a large specific capacitance of 1305.53 F g⁻¹ even at 5 A g⁻¹, but also fine rate properties with 729.81 F g⁻¹ at 50 A g⁻¹, as well as excellent cycling stability with a capacitance retention of nearly 94.89% after 10 000 circulations in a 6 M KOH electrolyte. The electrochemical performance of Co_1−xNi_xS electrodes is superior to that of CoS electrodes. The specific capacitance of Co_1−xNi_xS QDs presents a parabolic trend with the increase of Ni doping concentration. The excellent electrochemical properties of Co_1−xNi_xS QDs can be attributed to Ni atom doping, which can significantly enhance electron state density in the Image ID:d0se00366b-t1.gif

band of both Co and S. On the one hand, the impurity levels introduced by Ni doping can effectively improve the ability of charge storage. On the other hand, Ni atom doping increases the density of Co's and S's empty electron states and leads to the increase of the specific capacitance of Co_1−xNi_xS QDs. A theoretical calculation is carried out to systematically explain the origin of the specific capacitance of Co_1−xNi_xS QDs. The Co_1−xNi_xS electrode with outstanding electrochemical performance has the potential to meet the requirements of practical electrochemical energy storage applications.

中文翻译：

用作高性能超级电容器电极材料的Co1-xNixS量子点的合成和电化学性能

通过溶液扩散协同俘获掺杂方法成功合成了具有优异电化学性能的Co _{1- x} Ni _x S量子点（QDs）。可以提供更多电活性位并促进电解质溶液中离子交换的Co _{1- x} Ni _x S QDs较大的表面积有利于改善其电化学性能。Co _{1- x} Ni _x S（x = 0.58）QDs作为用于超级电容器的高性能超级电容器电极，即使在5 A g ^-1时，也不仅提供1305.53 F g ^-1的大比电容，但在50 A g ^-1时具有729.81 F g ^-1的优良速率特性，以及优异的循环稳定性，在6 M KOH电解质中进行1万次循环后的电容保持率接近94.89％。Co _1-_x Ni _x S电极的电化学性能优于CoS电极。Co _1-_x Ni _x S QDs的比电容随Ni掺杂浓度的增加呈抛物线趋势。Co _1-_x Ni _x S QDs的优异电化学性能可归因于Ni原子的掺杂，这可以显着提高电子中的电子态密度。图片编号：d0se00366b-t1.gif

一方面，Ni掺杂引入的杂质能有效提高电荷存储能力。另一方面，Ni原子掺杂增加了Co和S的空电子态的密度，并导致了Co _{1- x} Ni _x S QDs的比电容的增加。进行了理论计算以系统地解释Co _{1- x} Ni _x S QDs的比电容的起源。具有出色电化学性能的Co _{1- x} Ni _x S电极有潜力满足实际电化学储能应用的要求。

更新日期：2020-06-30

点击分享查看原文

点击收藏

阅读更多本刊最新论文