Guo, Lu
(Pillar of Engineering Product Development, Singapore University of Technology and Design)
,
Ding, Meng
(Pillar of Engineering Product Development, Singapore University of Technology and Design)
,
Yan, Dong
(Pillar of Engineering Product Development, Singapore University of Technology and Design)
,
Pam, Mei Er
(Pillar of Engineering Product Development, Singapore University of Technology and Design)
,
Vafakhah, Sareh
(Pillar of Engineering Product Development, Singapore University of Technology and Design)
,
Gu, Chengding
(School of Materials and Energy, Yunnan University)
,
Zhang, Wang
(Pillar of Engineering Product Development, Singapore University of Technology and Design)
,
Valdivia y Alvarado, Pablo
(Pillar of Engineering Product Development, Singapore University of Technology and Design)
,
Shi, Yumeng
(International Collaborative Laboratory of 2D Materials for Optoelectronics Science)
,
Yang, Hui Ying
Abstract Capacitive deionization (CDI) is considered as a promising approach to sustain fresh water supply with environmental friendliness and convenient electrode regeneration. As a novel CDI system, flow-through electrode (FTE) CDI is drawing researchers' attention due to its structural simplicit...
Abstract Capacitive deionization (CDI) is considered as a promising approach to sustain fresh water supply with environmental friendliness and convenient electrode regeneration. As a novel CDI system, flow-through electrode (FTE) CDI is drawing researchers' attention due to its structural simplicity, highly compact cells, cost effectiveness, and fast salt adsorption kinetics that are applicable for large-scale desalination of saline water. However, the FTE CDI architecture requires electrodes with robust structures and preferable permeability, considering the direct flow through mechanism, which limits their choices of electrode materials. Herein, we propose a facial electrospinning method to fabricate three-dimensional TiO2 encapsulated carbon nanofiber (TiO2@CNF), which possesses good mechanical stability and highly permeable macroporous-mesoporous structure to endure the reasonable feed pressure upon high-speed influent flushing. Moreover, the TiO2@CNF electrode shows evident pseudo-capacitive performance as well as high electrical conductivity. By integrating the features of both the TiO2@CNF and the FTE CDI architecture, the as-fabricated system displays a salt removal capacity of 15.50 mg g−1 and a desalination rate of 1.26 mg g−1 min−1 at 1.4 V. The TiO2@CNF provides a promising alternative for FTE CDI towards the future desalination technologies. Highlights TiO2@CNF designed with electrical conductivities and high specific surface areas for CDI applications. 3D nanostructured TiO2@CNF integrates the features of both the TiO2@CNF and the FTE CDI architecture. A high salt removal rate of 1.26 mg g−1 min−1 in the capactive desalination process. A removal capacity of 14.5 mg g−1 was obtained under external power ~ 1.4 V.
Abstract Capacitive deionization (CDI) is considered as a promising approach to sustain fresh water supply with environmental friendliness and convenient electrode regeneration. As a novel CDI system, flow-through electrode (FTE) CDI is drawing researchers' attention due to its structural simplicity, highly compact cells, cost effectiveness, and fast salt adsorption kinetics that are applicable for large-scale desalination of saline water. However, the FTE CDI architecture requires electrodes with robust structures and preferable permeability, considering the direct flow through mechanism, which limits their choices of electrode materials. Herein, we propose a facial electrospinning method to fabricate three-dimensional TiO2 encapsulated carbon nanofiber (TiO2@CNF), which possesses good mechanical stability and highly permeable macroporous-mesoporous structure to endure the reasonable feed pressure upon high-speed influent flushing. Moreover, the TiO2@CNF electrode shows evident pseudo-capacitive performance as well as high electrical conductivity. By integrating the features of both the TiO2@CNF and the FTE CDI architecture, the as-fabricated system displays a salt removal capacity of 15.50 mg g−1 and a desalination rate of 1.26 mg g−1 min−1 at 1.4 V. The TiO2@CNF provides a promising alternative for FTE CDI towards the future desalination technologies. Highlights TiO2@CNF designed with electrical conductivities and high specific surface areas for CDI applications. 3D nanostructured TiO2@CNF integrates the features of both the TiO2@CNF and the FTE CDI architecture. A high salt removal rate of 1.26 mg g−1 min−1 in the capactive desalination process. A removal capacity of 14.5 mg g−1 was obtained under external power ~ 1.4 V.
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