Biomass-derived activated carbon electrode coupled with a redox additive electrolyte for electrical double-layer capacit
- PDF / 1,926,763 Bytes
- 11 Pages / 547.087 x 737.008 pts Page_size
- 77 Downloads / 237 Views
RESEARCH PAPER
Biomass-derived activated carbon electrode coupled with a redox additive electrolyte for electrical double-layer capacitors Nghia Trong Nguyen & P.A. Le & Viet Bac T. Phung
Received: 9 March 2020 / Accepted: 24 November 2020 # Springer Nature B.V. 2020
Abstract Electrical double-layer capacitors (EDLCs) using a biomass-derived activated carbon electrode with Na2SO4–NaI–KI as a redox additive electrolyte were investigated. Biomass-derived activated carbon materials from pomelo peels were prepared by chemical activation in potassium hydroxide followed by carbonization. The biomass-derived activated carbon has a high specific surface area of 1360 m2 g−1, which is suitable for electrode materials. Moreover, a stable couple inorganic redox additive electrolyte were studied by the addition of NaI and KI to Na2SO4 forming a redox additive electrolyte. The electrical double-layer based on activated carbon/Na2SO4–NaI–KI/activated carbon has an excellent specific capacitance (334.3 F g−1),
N. T. Nguyen (*) School of Chemical Engineering, Hanoi University of Science and Technology, Dai Co Viet Street, Hai Ba Trung district, Hanoi, Vietnam e-mail: [email protected] P. Le Institute of Research and Development, Duy Tan University, Danang 550000, Vietnam e-mail: [email protected] P. Le Faculty of Natural Sciences, Duy Tan University, Danang 550000, Vietnam V. Phung (*) Institute of Sustainability Science, VNU Vietnam Japan University, Vietnam National University, Hanoi, Luu Huu Phuoc, My Dinh, Nam Tu Liem, Hanoi, Vietnam e-mail: [email protected]
which is 412% higher in comparison with that of activated carbon/Na2SO4/activated carbon (81.14 F g−1) at the same current density of 0.5 A g−1. The EDLC using Na2SO4–NaI–KI electrolyte has a high energy density of 22.75 W h kg−1, which is approximately four times higher than EDLCs based on Na2SO4 (5.52 W h kg−1). Keywords Nanostructures . Biomass-derived activated carbon . Redox electrolyte . Electrical double-layer capacitor
Introduction Electrical double-layer capacitors (EDLCs), also known as supercapacitors, are the potential future energy storages. They have gained much attention in various applications owing to their high energy density, fast charge–discharge, long durability, and good safety operation in comparison with traditional capacitors (Li et al. 2020; Xie et al. 2020). The electrode is a key for a supercapacitor and impacts its energy capability and lifetime. For this reason, various types of materials such as carbon nanotube, graphene, conducting polymer, and metal oxides (Wang and Kaskel 2012) have been studied for use as an electrode in supercapacitors in order to improve the electrical conductivity, the specific surface area, and low resistance. These materials are costly and require many steps for synthesis. Moreover, the fossil carbon resources for electrode materials are diminishing, so it is important to find and replace
371
Page 2 of 11
resources for the future. Among various types of electrode materials, biomass-derive
Data Loading...
