期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 266, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.118593
关键词
Hybrid capacitive deionization; Co3O4@CNF@CNT; Electrospinning; Pseudocapacitance; Desalination
资金
- Singapore Ministry of Education academic research grant Tier 2 [MOE2018-T2-2-178]
- 111 Project [D20015]
The cathode material, Co3O4@CNF@CNT, prepared using an unscalable electrospinning method, showed excellent pseudocapacitive performance and high rate performance, leading to improved salt adsorption capacity and rate in the HCDI system.
Hybrid capacitive deionization (HCDI) is emerging as an energy-efficient alternative for brackish water desalination with low expenditure cost and favourable ion removal effectiveness by adopting battery-type electrodes in the traditional capacitive deionization (CDI) system. Herein, an unscalable electrospinning method is introduced to contrive cathode material for HCDI system. Co3O4 and nitrogen-doped carbon nanotube decoration are formed successfully and uniformly distributed with the hollow structure of free-standing carbon nanofibers (Co3O4@CNF@CNT). The conductive bridges provided by the CNF matrix significantly shorten the diffusion length of Na+ and promote the electrical conductivity of the Co3O4 nanoparticles. Moreover, benefiting from the incorporation of nitrogen-doped CNTs, the electrical conductivity is further enhanced. The as-prepared Co3O4@CNF@CNT cathode shows excellent pseudocapacitive performance of 395F g(-1) at a scan rate of 1 mV s(-1) and superior rate performance of 279F g(-1) at 100 mV s(-1). The HCDI system delivers an outstanding salt adsorption capacity (SAC) of 58.6 mg g(-1) and a highest salt adsorption rate (SAR) of 12.27 mg g(-1) min(-1) with a potential difference of 1.4 V, indicating the great potential of applying Co3O4@CNF@CNT in the practical HCDI system.
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