Use of steam to prepare super active carbon with large pore volume for efficient capacitive deionization

Active carbons simultaneously possessing large surface area (>2000 m2/g) and high pore volume (>2.0 cm3/g) are pretty promising electrode materials for capacitive desalination. However, it is challenging to find a simple, cheap, and scalable method for preparing such materials. In this researc...

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Veröffentlicht in:Diamond and related materials 2023-11, Vol.139, p.110338, Article 110338
Hauptverfasser: Li, Dawei, Pang, Yanan, Meng, Nan, Zhang, Yu, Zhang, Zongbo, Yan, Xilu, Huang, Hexuan, Zhang, Wenqian, Zhao, Haoran, Yang, Lijun, Tian, Yuanyu, Li, Ao
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Sprache:eng
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Zusammenfassung:Active carbons simultaneously possessing large surface area (>2000 m2/g) and high pore volume (>2.0 cm3/g) are pretty promising electrode materials for capacitive desalination. However, it is challenging to find a simple, cheap, and scalable method for preparing such materials. In this research, H3PO4-loaded coconut shell was fast heated in steam flow to yield active carbon for capacitive desalination. The as-yielded active carbon simultaneously displayed large specific surface area (2869 m2/g), high pore volume (2.26 cm3/g), and big micropore volume (0.83 cm3/g). Because of these characteristics, the carbon showed an electrosorption capacity of 64.1 mg/g in a membrane capacitive deionization (MCDI) configuration at 1.2 V in 500 mg/L NaCl solution. The capacity ranked among the highest values ever reported for C-based materials. The capacity retention exceeded 86 % after 20 adsorption/desorption cycles. Besides, the carbon showed high charge efficiency (92.4 %) and desalination rate. This research was beneficial for scalable synthesis of carbon materials for CDI. [Display omitted] •Use of steam activation to reduce production cost and environment hazard.•The carbon shows high surface area (2869 m2/g) and big pore volume (2.26 cm3/g)•It has high electroadsorption capacity (64.1 mg/g) and charge efficiency (92.4 %).
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2023.110338