Li Xiao-Min, Wang Yameng, Mu Yongbiao, Liu Jiang, Zeng Lin, Lan Ya-Qian
Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
ACS Appl Mater Interfaces. 2022 Feb 23;14(7):9264-9271. doi: 10.1021/acsami.2c00500. Epub 2022 Feb 9.
Seeking fast proton transport pathways at ambient conditions is desirable but challenging. Here, we report a strategy to synthesize a composite material with a polyoxometalate (POM) and an ionic liquid (IL) confined in stable metal-organic framework (MOF) channels through electrostatic interaction. The obtained SOH-IL-PMo@MIL-101 possesses fast proton transfer, and its proton conductivity can reach 1.33 × 10 S cm at ambient conditions (30 °C, 70% relative humidity (RH)), which is the highest value among the MOF-based proton conductors operated in an ambient environment. Therefore, it has the potential of becoming a room-temperature proton conductor without a humidifier. Importantly, the composite material is further fabricated into a composite membrane for proton-exchange membrane fuel cells (PEMFCs), which can deliver a power density of 0.93 mW cm at 30 °C and 98% RH. This result can lay a fundamental basis for the application of MOF-based proton conductors in the area of electrochemical energy conversion.
在环境条件下寻找快速质子传输途径是很有必要的，但具有挑战性。在此，我们报告了一种通过静电相互作用合成一种复合材料的策略，该复合材料由多金属氧酸盐（POM）和离子液体（IL）限制在稳定的金属有机框架（MOF）通道中。所得到的SOH-IL-PMo@MIL-101具有快速质子转移能力，其质子电导率在环境条件（30℃，70%相对湿度（RH））下可达到1.33×10 S cm，这是在环境环境中运行的基于MOF的质子导体中的最高值。因此，它有潜力成为一种无需加湿器的室温质子导体。重要的是，该复合材料进一步制成用于质子交换膜燃料电池（PEMFC）的复合膜，在30℃和98%RH条件下可提供0.93 mW cm的功率密度。这一结果可为基于MOF的质子导体在电化学能量转换领域的应用奠定基础。
