文献类型：期刊文献

英文题名：Ultrafast Synthesis of K+ Doped Birnessite-Type Mno2 in Ethanolamines Based Deep Eutectic Solvents with Improved Electrochemical Performance

作者：Ding, Li[1]; Li, Zhaoxing[1]; Chen, Lifang[1]; Qi, Zhiwen[1]

机构：[1] State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220444594)

语种：英文

外文关键词：Chlorine compounds - Crystallinity - Eutectics - High resolution transmission electron microscopy - Hydrogen bonds - Manganese oxide - Morphology - Scanning electron microscopy - Supercapacitor - Triethanolamine - X ray photoelectron spectroscopy

摘要：Ultrafast synthesis of birnessite-type MnO2 was proposed by a facile room temperature wetchemical method under ethanolamines based deep eutectic solvents (DESs), where monoethanolamine (MEA), diethanolamine, and triethanolamine were used as hydrogen bond donor (HBD) and choline chloride (ChCl) was acted as hydrogen bond acceptor. The as-prepared materials were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and N2 adsorption/desorption. The results indicated that K+ could be pre-inserted into birnessite-type MnO2 during the preparation process by the addition of ethanolamines based DESs. The morphology, crystallinity and porosity of manganese oxides could be effectively adjusted by changed types of HBD in the DESs. The mesoporous granular K+ pre-inserted birnessite-type MnO2 prepared in [ChCl:2MEA] with a high specific surface area of 220 m2/g and electrical conductivity exhibited the best electrochemical performance with high specific capacitance of 290 F/g at the current density of 0.1 A/g. Moreover, it could still maintain 92.5% capacity retention after 8000 cycles. ? 2022, The Authors. All rights reserved.