Issue

Vol. 12 (2020)

Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide as Cathode Materials for Alkaline Aqueous Batteries

https://doi.org/10.1007/s40820-019-0355-0
Yirong Zhu
College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou 412007, People’s Republic of China
Jingying Li
College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou 412007, People’s Republic of China
Xiaoru Yun
College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou 412007, People’s Republic of China
Ganggang Zhao
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Peng Ge
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Guoqiang Zou
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Yong Liu
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, People’s Republic of China
Hongshuai Hou
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Xiaobo Ji
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China

Corresponding Author: Hongshuai Hou

hs‑hou@csu.edu.cn

Nano-Micro Letters, Vol. 12 (2020), Article Number: 16

Abstract

Carbon quantum dots (CQDs) as a new class of emerging materials have gradually drawn researchers’ concern in recent years. In this work, the graphitic CQDs are prepared through a scalable approach, achieving a high yield with more than 50%. The obtained CQDs are further used as structure-directing and conductive agents to synthesize novel N,S-CQDs/NiCo2S4 composite cathode materials, manifesting the enhanced electrochemical properties resulted from the synergistic effect of highly conductive N,S-codoped CQDs offering fast electronic transport and unique micro-/nanostructured NiCo2S4 microspheres with Faradaic redox characteristic contributing large capacity. Moreover, the nitrogen-doped reduced graphene oxide (N-rGO)/Fe2O3 composite anode materials exhibit ultrahigh specific capacity as well as significantly improved rate property and cycle performance originating from the high-capacity prism-like Fe2O3 hexahedrons tightly wrapped by highly conductive N-rGO. A novel alkaline aqueous battery assembled by these materials displays a specific energy (50.2 Wh kg−1), ultrahigh specific power (9.7 kW kg−1) and excellent cycling performance with 91.5% of capacity retention at 3 A g−1 for 5000 cycles. The present research offers a valuable guidance for the exploitation of advanced energy storage devices by the rational design and selection of battery/capacitive composite materials.


Highlights:


1 The scalable graphitic carbon quantum dots (CQDs) are obtained with a high yield of more than 50%.
2 The CQDs are utilized to synthesize novel NS-CQDs/NiCo2S4 composite which shows enhanced electrochemical properties.
3 The assembled novel alkaline aqueous battery delivers superior electrochemical performances.

Keywords

Energy storage Alkaline aqueous batteries Carbon quantum dot Nickel cobalt sulfide
Zhu, Yirong, Jingying Li, Xiaoru Yun, Ganggang Zhao, Peng Ge, Guoqiang Zou, Yong Liu, Hongshuai Hou, and Xiaobo Ji. 2020. “Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide As Cathode Materials for Alkaline Aqueous Batteries”. Nano-Micro Letters 12 (January):16. https://doi.org/10.1007/s40820-019-0355-0.
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