等离子体辅助制备炭布负载大层间距NiCoAl-LDHs及其电化学去离子性能
Plasma-assisted preparation of NiCoAl-layered double hydroxides with a large interlayer spacing on carbon cloth for electrochemical deionization
姜秋彤 1王国庆 1李益 1黄宏伟 1李倩 1杨建1
作者信息
- 1. 南京工业大学 材料科学与工程学院,江苏 南京 211816;南京工业大学 江苏先进无机功能复合材料协同创新中心,江苏 南京 211816
- 折叠
摘要
电容去离子技术近年来被认为是一种新兴的海水淡化技术,尤其在苦咸水范围内具有经济节能的特点.然而,目前关于除氯电极的研究较少,同时缓慢的除盐动力学也制约了除氯电极的发展.本工作通过在表面酸处理后的柔性炭布(ACC)上原位生长层状氢氧化物NiCoAl-LDHs纳米片阵列并进行Ar等离子体处理,制备了具有扩大层间距的Ar-NiCoAl-LDHs@ACC材料.炭布基底抑制了NiCoAl-LDHs纳米片的团聚并提高了电导率,Ar等离子体处理则进一步扩大了NiCoAl-LDHs层间距并改善了亲水性,提供了快速的氯离子扩散通道,并释放了更多的层间活性位点,实现了高除盐动力学.将Ar-NiCoAl-LDHs@ACC作为除氯电极与活性炭组装了混合式电容去离子器件.在 1 000 mg L-1 NaCl溶液及 1.2 V工作电压下,除盐容量可达到 93.26 mg g-1,除盐速率可达到 0.27 mg g-1 s-1,电荷效率高达 0.97.在 300 mg L-1 NaCl溶液及 0.8 V工作电压下,经 100次循环后容量保持率仍在 85%以上.本工作的制备策略为大层间距二维金属氢氧化物材料的可控制备和高性能电化学除氯电极的设计构建提供了新思路.
Abstract
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(LDHs)@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 argon 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 1 000 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.
关键词
电化学去离子/海水淡化/大层间距/NiCoAl-LDHs/高除盐动力学Key words
Electrochemical deionization/Desalination/Enhanced interlayer space/NiCoAl-LDHs/High desalination kinetics引用本文复制引用
基金项目
国家自然科学基金(22309081)
江苏省自然科学基金(BK20230320)
江苏省高等学校自然科学研究项目(22KJB430005)
广东省能源转换材料与技术重点实验室项目(MATEC2023KF006)
出版年
2024
国家科技期刊平台
NSTL
万方数据