Coconut Shell-Derived Activated Carbon for High-Performance Solid-State Supercapacitors

Autor: Kuan-Ching Lee, Mitchell Shyan Wei Lim, Zhong-Yun Hong, Siewhui Chong, Timm Joyce Tiong, Guan-Ting Pan, Chao-Ming Huang
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Energies, Vol 14, Iss 15, p 4546 (2021)
Druh dokumentu: article
ISSN: 1996-1073
DOI: 10.3390/en14154546
Popis: Coconut shells, low-cost and renewable agro-wastes, were used as a starting material in the synthesis of hierarchical activated carbons via hydrothermal, KOH-activation, and carbonization techniques. The ratio of KOH to hydrochar was varied in a systemic manner to study how it influences the texture and electrochemical behavior of the capacitor. Coconut shell-based carbon coated on nickel foams presented a surface area of 1567 m2 g−1, with micropores as well as mesopores widely distributed. The sample showed superior electrochemical performance, attaining 449 F g−1 at 1 A g−1 in 6 M LiNO3 aqueous solution. The solid-state symmetric supercapacitor device delivered a specific capacitance of 88 F g−1 at 1 A g−1 and a high energy density of 48.9 Whkg−1 at a power density of 1 kW kg−1. At a wide voltage window of 2.0 V, the sample was highly stable during the cycle test, showing a 92% capacitance retention at 2 A g−1 after cycling for 5000 times. The superior performance is due to the sample possessing great BET surface area, a good distribution of pores, and the usage of a suitable electrolyte. This facilitates an electrical double layer that can be deployed for applications to store energy.
Databáze: Directory of Open Access Journals
Nepřihlášeným uživatelům se plný text nezobrazuje