Optimized synthetic route for reduced graphene oxide-decorated Cu0.33Co0.67Se2 nanorods on Ni foam integrated with N, S co-doped porous carbon to design high-performance hybrid supercapacitor electrodes

• Published in: Journal of alloys and compounds 2023-12, Vol.966, p.171421, Article 171421
• Main Authors: Qu, Xiaoxiao, Jeon, Sangheon, Jeong, Jeonghwa, Kang, Weiwei, Xing, Baolin, Zhang, Chuanxiang, Hong, Suck Won
• Format: Article
• Language: English
• Subjects: Hybrid supercapacitor; Porous carbon; Reduced graphene oxide; Selenide
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2023.171421

As advanced energy storage devices for commercial applications, hybrid supercapacitors (HSCs) assembled with electric double-layer capacitive- and battery-type electrodes combine the advantages of electric double-layer capacitors and batteries. Thus, it offers very high potential as well as higher energy density with sufficient durability than other energy storage devices. However, the selection of electrodes has a considerable determining effect on the performance of HSCs. Here, we developed an electrode material system for HSCs with copper-cobalt selenide composite on Ni foam with the assistance of carbon nanomaterial (reduced graphene oxide, rGO). The synergistic effects of Cu0.33Co0.67Se2 loaded with rGO led to excellent electrochemical performance with respect to a unique structure. Moreover, we synthesized N, S co-doped glucose-based porous carbon (NSPC) as an anode that exhibited stable electrochemical properties with interconnected networks. The configured HSCs (i.e., Cu0.33Co0.67Se2-rGO//NSPC) represented a wide voltage window (∼1.6 V) and a superior energy density (∼41.5 Wh kg−1) at a power density of ∼801.5 W kg−1 that exhibited their inherent advantageous characteristics and combinatorial effects. Therefore, the efficient synergistic effects and superior electrochemical performances were optimized with appropriate ratios of the anode and cathode in the integrated system, which demonstrated high energy density and excellent structural stability. [Display omitted] •The synthetic route was optimized to grow Cu0.33Co0.67Se2 nanorods on Ni foam by employing a modified hydrothermal method.•The Cu0.33Co0.67Se2 composite wrapped with rGO as electrodes showed a high specific capacity of ~458 mAh g−1 at 1 A g−1.•Highly porous N, S-doped carbon nanomaterial derived from glucose was utilized as the anode electrodes.•The assembled hybrid supercapacitor exhibited a maximum energy density of ∼41.5 Wh kg−1.