Zhang Jin, Zhang Ru, Liu Yangyang, Kong Ya-Ru, Luo Hong-Bin, Zou Yang, Zhai Lu, Ren Xiao-Ming
State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032-8202, United States.
ACS Appl Mater Interfaces. 2021 Dec 22;13(50):60084-60091. doi: 10.1021/acsami.1c20884. Epub 2021 Dec 10.
Crystalline porous materials, such as metal-organic frameworks (MOFs) and covalent organic frameworks (COFs), have been demonstrated to be versatile material platforms for the development of solid proton conductors. However, most crystalline porous proton conductors suffer from decreasing proton conductivity with increasing temperature due to releasing water molecules, and this disadvantage severely restricts their practical application in electrochemical devices. In this work, for the first time, hydrophilic carbon dots (CDs) were utilized to hybridize with high proton conductivity MOF-802, which is a model of MOF proton conductors, aiming to improve its water-retention capacity and thus enhance proton conduction. The resultant CDs@MOF-802 exhibits impregnable proton conduction with increasing temperature, and the proton conductivity reaches 10 S cm, much superior to that of MOF-802, making CDs@MOF-802 one of the most efficient MOF proton conductors reported so far. This study provides a new strategy to improve the water-retention capacity of porous proton conductors and further realize excellent proton conduction.
晶体多孔材料，如金属有机框架（MOF）和共价有机框架（COF），已被证明是用于开发固体质子导体的多功能材料平台。然而，大多数晶体多孔质子导体由于水分子的释放，随着温度升高质子传导率会降低，这一缺点严重限制了它们在电化学装置中的实际应用。在这项工作中，首次利用亲水性碳点（CD）与高质子传导率的MOF-802（一种MOF质子导体模型）进行杂化，旨在提高其保水能力，从而增强质子传导。所得的CDs@MOF-802随着温度升高表现出不可阻挡的质子传导，质子传导率达到10 S cm，远优于MOF-802，使CDs@MOF-802成为迄今为止报道的最有效的MOF质子导体之一。这项研究提供了一种新策略，以提高多孔质子导体的保水能力，并进一步实现优异的质子传导。
