文献类型：期刊文献

英文题名：Tailoring interlayer spacing in MXene cathodes to boost the desalination performance of hybrid capacitive deionization systems

作者：Li, Bei[1] Sun, Kang[2] Xu, Wenyu[3] Liu, Xiaojing[1] Wang, Ao[2] Boles, Steven[4] Xu, Bin[5] Hui, Haibo[3] Yao, Dongrui[1]

第一作者：Li, Bei

通信作者：Yao, DR[1];Hui, HB[2]

机构：[1]Jiangsu Prov & Chinese Acad Sci, Jiangsu Engn Res Ctr Aquat Plant Resources & Wate, Inst Bot, Nanjing 210014, Peoples R China;[2]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China;[3]Anhui Univ, Sch Mat Sci & Engn, Hefei 230601, Peoples R China;[4]Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, Trondheim, Norway;[5]Minist Ecol & Environm Peoples Republ China, Natl Inst Environm Sci, Nanjing 210042, Peoples R China

年份：2023

卷号：16

期号：5

起止页码：6039-6047

外文期刊名：NANO RESEARCH

收录：;EI(收录号：20222312202568);Scopus(收录号：2-s2.0-85131328701);WOS:【SCI-EXPANDED(收录号:WOS:000805068400001)】；

基金：The authors would like to acknowledge the National Natural Science Foundation of China (Nos. 52100009, 51871001, and 51808251), the China Postdoctoral Science Foundation (No. 2021111691337), Excellent Youth Fund of Anhui Province (No. 2108085Y17), Hundred-Talent Program of Anhui Province, and the Innovative team project of Nanjing Institute of Environmental Sciences, MEE.

语种：英文

外文关键词：capacitive deionization; MXene; intercalation materials; hybrid capacitive deionization; cation intercalation

摘要：Capacitive deionization (CDI) is a promising technology to satisfy the global need for fresh water, since it can be both economical and sustainable. While two-dimensional transition metal carbides/nitrides (MXenes) exhibit great characteristics for use as CDI electrode materials, their tightly spaced layered structure renders intercalation inefficiency. In this study, the interlayer distance of MXenes is precisely modulated by inserting different quantity of one-dimensional bacterial fibers (BC), forming freestanding MXene/BC composite electrodes. Among the studied samples, MXene/BC-33% electrode with the interlayer spacing of 15.2 A can achieve an optimized tradeoff among various desalination performance metrics and indicators. The salt adsorption capacity (SAC), the average salt adsorption rate (ASAR), the energy normalized adsorbed salt (ENAS), and the thermodynamic energy efficiency (TEE) of the MXene/BC-33% electrode are improved by 24%, 46%, 13%, and 66% respectively compared with those of pure MXene electrode. While the insertion of BC improves the ion diffusion pathways and facilitates the intercalation kinetics, the desalination performance decreases when the insertion amount of BC exceeds 40%. This is attributed to the overlarge resistance of the composite and the resulting increased energy consumption. This study reveals the desalination performance tradeoffs of MXene-based electrodes with different interlayer distances and also sheds light on the fundamental ion storage mechanisms of intercalation materials in a CDI desalination system.