Novel stalactiform structural CoNi-rGO for supercapacitors with enhanced electrochemical performance

• Published in: CrystEngComm Vol. 26; no. 13; pp. 1843 - 1851
• Main Authors: Sun, Yang, Zhang, Zhaoyi, Xiang, Cong, Jiang, Yifan, Feng, Yan, Cheng, Xiaomei, Li, Xiangzi, Wang, Meifang
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 25.03.2024
• Subjects: Activated carbon; Capacitance; Chemical composition; Current density; Electrochemical analysis; Hydroxides; Intermetallic compounds; Supercapacitors
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/d3ce01240a

NiCo layered double hydroxide (LDH) has always been a well-explored subject because of its non-toxicity, low cost and excellent electrochemical stability owing to its special layered structure and adjustable chemical composition. Here, stalactiform S-CoNi-rGO possesses structural advantages of spines penetrating and supporting the nanosheets and exhibits high specific capacitance (3922 F g −1 /4.62 F cm −2 at a current density of 1 A g −1 ) and outstanding cycling stability (123.8% retention of the initial specific capacitance and ∼90.2% of the biggest capacitance at 10 A g −1 after 10 000 cycles). An asymmetric supercapacitor (ASC) fabricated using stalactiform S-CoNi-rGO as the anode and activated carbon (AC) as the cathode achieves a high energy density of 114.03 W h kg −1 at a power density of 0.85 kW kg −1 (at a current density of 1 A g −1 ). This study suggests that structural optimization can achieve high-performance supercapacitors. Stalactiform S-CoNi-rGO possesses spines penetrating and supporting the nanosheet structure and shows a high specific capacitance of 3922.0 F g −1 at a current density of 1 A g −1 .