Qian Wang,Liang Shao,Zhonglei Ma,Juanjuan Xu,Ying Li,Caiyun Wang
Metal-Organic Frameworks (MOFs) have attracted increasing attention in the field of energy storage owing to their high porosity, high specific surface area, high charge storage. However, the poor conductivity in most MOFs largely hinders their electrical properties. In this work, we developed an effective strategy to grow the conductive polyaniline (PANI) inside the pores of MIL-101 (labeled as PANI/MIL-101) to form a fixed interpenetrating network structure. The electron-rich imine group in PANI is chelated with the coordinatively unsaturated metal sites (CUS) in MIL-101 to form a relatively strong bonded complex and through other synergistic effects to enhance the conductivity and electrochemical properties. The resultant PANI/MIL-101 exhibited a superior high capacitance of 1197 F g −1 (i.e., 957.6C g −1 ) at 1 A g −1 in constant current charge and discharge test. The assembled flexible solid-state supercapacitor showed a favorable specific capacitance, power density and good cycling stability (a 81% capacitance retention rate over 10,000 cycles). It also demonstrates a good flexibility, as evidenced by a small capacitance loss of 10% after being subject to 1000 bending cycles at 180°. The PANI/MIL-101 nanocomposite showed great potential in energy storage device.
Polymer-MOF composite membranes have attracted the attention of researchers in the field of organic solvent nanofiltration by fully utilizing the synergistic advantages of the processability of polymers and the molecular sieving properties of metal-organic frameworks (MOFs). However, the performance of such composite membranes in organic solvents is greatly reduced by insufficient interfacial interactions at the polymer-MOF interface. In this study, an in situ co -construction strategy of polyaniline (PANI) and MOF was employed to create a stabilized interface on the polymer matrix while converting the poly(ether ether ketone) precursor substrate (PEEKt) into solvent-resistant PEEK to fabricate high-performance nanofiltration membranes for organic solvents (PEEK-PANI@MIL-101). This composite membrane exhibits a rejection rate exceeding 97 % for Rose Bengal (RB) in ethanol solution, coupled with an ultrahigh ethanol permeance of 266 L m −2 h −1 bar −1 . The integrated dual in situ growth strategy significantly enhances the interfacial adhesion of the composite membrane. Furthermore, the membrane demonstrates outstanding thermal resistance and acid stability, ensuring robust performance under harsh operating conditions.
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