High‐Performance NiCo2O4/Graphene Quantum Dots for Asymmetric and Symmetric Supercapacitors with Enhanced Energy Efficiency

材料科学 超级电容器 量子点 石墨烯 拉曼光谱 背景(考古学) 纳米技术 表征(材料科学) 电化学 电极 物理 化学 光学 物理化学 生物 古生物学
作者
Ambadi Lakshmi‐Narayana,Navid Attarzadeh,Vaithalingam Shutthanandan,C.V. Ramana
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:34 (40) 被引量:36
标识
DOI:10.1002/adfm.202316379
摘要

Abstract For the sustainable growth of future generations, energy storage technologies like supercapacitors and batteries are becoming more and more common. However, reliable and high‐performance materials’ design and development is the key for the widespread adoption of batteries and supercapacitors. Quantum dots with fascinating and unusual properties are expected to revolutionize future technologies. However, while the recent discovery of quantum dots honored with a Nobel prize in Chemistry, their benefits for the tenacious problem of energy are not realized yet. In this context, herein, chemical‐composition tuning enabled exceptional performance of NiCo 2 O 4 (NCO)/graphene quantum dots (GQDs) is reported, which outperform the existing similar materials, in supercapacitors. A comprehensive study is performed on the synthesis, characterization, and electrochemical performance evaluation of highly functional NCO/GQDs in supercapacitors delivering enhanced energy efficiency. The high‐performance, functional NCO/GQDs electrode materials are synthesized by the incorporation of GQDs into NCO. The effect of variable amount of GQDs on the energy performance characteristics of NCO/GQDs in supercapacitors is studied systematically. In‐depth structural and chemical bonding analyses using X‐ray diffraction (XRD) and Raman spectroscopic studies indicate that all the NCO/GQDs composites crystallize in the spinel cubic phase of NiCo 2 O 4 while graphene integration evident in all the NCO/GQDs. The scanning electron microscopy imaging analysis reveals homogeneously distributed spherical particles with a size distribution of 5–9 nm validating the formation of QDs. The high‐resolution transmission electron microscopy analyses reveal that the NCOQDs are anchored on graphene sheets, which provide a high surface area of 42.27 m 2 g −1 and high mesoporosity for the composition of NCO/GQDs‐10%. In addition to establishing reliable electrical connection to graphene sheets, the NCOQDs provide reliable 3D‐conductive channels for rapid transport throughout the electrode as well as synergistic effects. Chemical‐composition tuning, and optimization yields NCO/GQDs‐10% to deliver the best specific capacitance of 3940 Fg −1 at 0.5 Ag −1 , where the electrodes retain ≈98% capacitance after 5000 cycles. The NCO/GQD‐10%//AC asymmetric supercapacitor device demonstrates outstanding energy density and power density values of 118.04 Wh kg −1 and 798.76 W kg −1 , respectively. The NCO/GQDs‐10%//NCO/GQDs‐10% symmetric supercapacitor device delivers excellent energy and power density of 24.30 Wh kg −1 and 500 W kg −1 , respectively. These results demonstrate and conclude that NCO/GQDs are exceptional and prospective candidates for developing next‐generation high‐performance and sustainable energy storage devices.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
热情千风发布了新的文献求助10
刚刚
乐观文龙完成签到,获得积分10
刚刚
1秒前
无辜澜发布了新的文献求助10
1秒前
云宝完成签到 ,获得积分10
1秒前
李牛牛完成签到,获得积分10
3秒前
4秒前
树下猫完成签到,获得积分10
4秒前
CodeCraft应助美女采纳,获得10
4秒前
yar应助加百莉采纳,获得10
5秒前
打打应助yee采纳,获得10
7秒前
跳跃的航空完成签到,获得积分10
8秒前
烟花应助豆浆来点蒜泥采纳,获得10
13秒前
vict完成签到,获得积分10
14秒前
14秒前
KSAcc完成签到,获得积分20
14秒前
李健应助科研通管家采纳,获得30
14秒前
欢喜橙子应助科研通管家采纳,获得10
14秒前
14秒前
耍酷亦玉应助科研通管家采纳,获得50
15秒前
JamesPei应助科研通管家采纳,获得10
15秒前
斯文败类应助科研通管家采纳,获得10
15秒前
CodeCraft应助科研通管家采纳,获得10
15秒前
ZeKaWa应助科研通管家采纳,获得10
15秒前
三七完成签到 ,获得积分10
15秒前
15秒前
上官若男应助科研通管家采纳,获得10
15秒前
赘婿应助科研通管家采纳,获得30
15秒前
ZeKaWa应助科研通管家采纳,获得10
15秒前
ZeKaWa应助科研通管家采纳,获得10
16秒前
Owen应助科研通管家采纳,获得10
16秒前
天天快乐应助科研通管家采纳,获得10
16秒前
16秒前
桐桐应助Kevin Huang采纳,获得30
16秒前
16秒前
丘比特应助科研通管家采纳,获得10
16秒前
LZW完成签到,获得积分10
16秒前
热情千风完成签到,获得积分10
17秒前
17秒前
是你啊完成签到,获得积分10
18秒前
高分求助中
【请各位用户详细阅读此贴后再求助】科研通的精品贴汇总(请勿应助) 10000
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
求 5G-Advanced NTN空天地一体化技术 pdf版 500
International Code of Nomenclature for algae, fungi, and plants (Madrid Code) (Regnum Vegetabile) 500
Maritime Applications of Prolonged Casualty Care: Drowning and Hypothermia on an Amphibious Warship 500
Comparison analysis of Apple face ID in iPad Pro 13” with first use of metasurfaces for diffraction vs. iPhone 16 Pro 500
Towards a $2B optical metasurfaces opportunity by 2029: a cornerstone for augmented reality, an incremental innovation for imaging (YINTR24441) 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 4065183
求助须知:如何正确求助?哪些是违规求助? 3603756
关于积分的说明 11445834
捐赠科研通 3326359
什么是DOI,文献DOI怎么找? 1828747
邀请新用户注册赠送积分活动 898896
科研通“疑难数据库(出版商)”最低求助积分说明 819394