In Situ-Grown Heterostructured Co3S4/CNTs/C Nanocomposites with a Bridged Structure for High-Performance Supercapacitors

Yuqing Qiao; Fan Wang; Na Li; Weimin Gao; Tifeng Jiao

doi:10.1021/acsomega.1c05081

In Situ-Grown Heterostructured Co₃S₄/CNTs/C Nanocomposites with a Bridged Structure for High-Performance Supercapacitors

ACS Omega. 2021 Dec 3;6(49):33855-33863. doi: 10.1021/acsomega.1c05081. eCollection 2021 Dec 14.

Authors

Yuqing Qiao^{1

2}, Fan Wang¹, Na Li¹, Weimin Gao¹, Tifeng Jiao^{1

2}

Affiliations

¹ Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
² Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.

Abstract

As one of the most competitive candidates for energy storage devices, supercapacitors have attracted extensive research interest due to their incomparable power density and ultralong cycling stability. However, the large surface area required for charge storage is an irreconcilable contradiction with the requirement of energy density. Therefore, a high energy density is a major challenge for supercapacitors. To solve the contradiction, Co₃S₄/CNTs/C with a bridged structure is designed, where CNTs generated in situ serve as a bridge to connect a porous carbon matrix and a Co₃S₄ nanoparticle, and Co₃S₄ nanoparticles are anchored on the topmost of CNTs. The porous carbon and Co₃S₄ are used for electrochemical double-layer capacitors and pseudocapacitors, respectively. This bridged structure can efficiently utilize the surface of Co₃S₄ nanoparticles to increase the overall energy storage capacity and provide more electrochemically active sites for charge storage and delivery. The materials show an energy density of 41.3 Wh kg^-1 at 691.9 W kg^-1 power density and a retaining energy density of 33.1 Wh kg^-1 at a high power density of 3199.9 W kg^-1 in an asymmetrical supercapacitor. The synthetic technique provides a simple method to obtain heterostructured nanocomposites with a high energy density by maximizing the effect of pseudocapacitor electrode active materials.