Coconut shell-derived activated carbon and carbon nanotubes composite: a promising candidate for capacitive deionization electrode

• DOI: 10.1016/j.synthmet.2020.116415
• Publication Date: 2020-05-11T16:33:37Z
• Authors: Le Thanh Nguyen H...; Thi Nam Pham; Thai Hoang Nguyen; Viet Hai Le; Thi Thom Nguyen; Thi Diem Kieu Nguyen; Thanh Nhut Tran; Pham Anh Vu Ho; Thanh Thien Co; Thi Thu Trang Nguyen; Thi Kieu Anh Vo; Trung Huy Nguyen; Thi Thu Vu; Viet Mui Luong; Hiroshi Uyama; Gia Vu Pham; Thai Hoang; Dai Lam Tran
• Keywords: Capacitive Deionization; Carbon fibers

Abstract Aiming at more efficient use of coconut resources to achieve multi-purpose goals, this work proposes an innovative composite for capacitive deionization (CDI) electrode in desalination applications when using coconut shell-derived activated Carbon (AC) as a matrix into which a certain amount of carbon nanotubes (CNTs) is incorporated. The electrochemical studies show that the optimized 9mAC:1CNTs electrode with a surface area of 630 m2/g has a specific capacitance of 90.2 F/g (at scan rate of 20 mV/s), salt adsorption capacity (SAC) of 14.1 mg/g at 1.0 V. SAC value is retained as high as 95.7% after 100 adsorption–desorption cycles at 1.0/0 V, showing a good cyclic stability of the electrode composites. Moreover, a calculated specific energy consumption (SEC) value of 0.312 kW h/m3 was quite low compared with other CDI electrodes reported in literature. Briefly, the present study indicates that AC-CNTs composite can serve as promising CDI electrode materials for desalination application.