等离子体辅助制备碳布上具有较大层间距的镍钴铝层双氢氧化物的电化学去离子技术

IF 5.7 3区 材料科学 Q2 Materials Science New Carbon Materials Pub Date : 2024-06-01 DOI:10.1016/S1872-5805(24)60854-1
Qiu-tong Jiang , Guo-qing Wang , Yi Li , Hong-wei Huang , Qian Li , Jian Yang
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引用次数: 0

摘要

近年来,电容式去离子法一直被认为是一种新兴的海水淡化技术,特别是在苦咸水方面具有经济和节能的特点。然而,目前有关氯离子去除电极的研究很少,而且脱盐动力学缓慢,限制了其发展。通过在酸处理碳布(ACC)上原位生长镍钴铝-层状双氢氧化物(LDH)纳米片阵列并随后进行氩等离子处理,制备了层间距增大的氩镍钴铝-层状双氢氧化物(LDH)@ACC 材料。碳布抑制了镍钴铝-LDHs 纳米片的团聚并提高了导电性,而等离子体处理增加了镍钴铝-LDHs 的层间距并提高了其亲水性。这为氯离子提供了快速扩散通道和更多的层间活性位点,从而实现了较高的脱盐动力学性能。以 Ar-NiCoAl-LDHs@ACC 作为氯离子去除电极,以活性炭作为钠离子去除电极,组装了一个混合电容式去离子(HCDI)电池。在 1000 mg L-1 NaCl 溶液中,该 HCDI 电池在 1.2 V 电压下的脱盐容量高达 93.26 mg g-1,脱盐速率高达 0.27 mg g-1 s-1,充电效率高达 0.97。在 300 mg L-1 NaCl 溶液中以 0.8 V 的电压循环 100 次后,容量保持率仍在 85% 以上。该研究成果为控制制备具有较大层间距的二维金属氢氧化物材料和设计高性能电化学氯离子去除电极提供了新思路。
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Plasma-assisted preparation of NiCoAl-layered double hydroxides with alarge interlayer spacing on carbon cloth forelectrochemical deionization

Capacitive deionization has been considered an emerging desalination technique in recent years, especially for its economic and energy-saving characteristics for brackish water. However, there are currently few studies on chloride ion removal electrodes, and the slow desalination kinetics limits their development. Ar-NiCoAl- layered double hydroxide (LDH)@ACC materials with an increased interlayer spacing were prepared by the in-situ growth of NiCoAl-LDHs nanosheet arrays on acid-treated carbon cloth (ACC) and subsequent Ar plasma treatment. The carbon cloth suppresses the agglomeration of the NiCoAl-LDHs nanosheets and improves the electrical conductivity, while the plasma treatment increases the interlayer spacing of NiCoAl-LDHs and improves its hydrophilicity. This provides rapid diffusion channels and more interlayer active sites for chloride ions, achieving high desalination kinetics. A hybrid capacitive deionization (HCDI) cell was assembled using Ar-NiCoAl-LDHs@ACC as the chloride ion removal electrode and activated carbon as the sodium ion removal electrode. This HCDI cell achieved a high desalination capacity of 93.26 mg g−1 at 1.2 V in a 1000 mg L−1 NaCl solution, a remarkable desalination rate of 0.27 mg g−1 s−1, and a good charge efficiency of 0.97. The capacity retention remained above 85% after 100 cycles in a 300 mg L−1 NaCl solution at 0.8 V. The work provides new ideas for the controlled preparation of two-dimensional metal hydroxide materials with a large interlayer spacing and the design of high-performance electrochemical chlorine ion removal electrodes.

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来源期刊
New Carbon Materials
New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.10
自引率
8.80%
发文量
3245
审稿时长
5.5 months
期刊介绍: New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.
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