Abstract
The design and construction of electrode materials with high specific capacity and excellent cycling stability represents a crucial and challenging for the development of supercapacitors. Polyoxometalates (POMs)-based metal–organic frameworks, which are obtained via self-assembling of POMs and organic ligands, showcase high redox capability and stability and are suitable for electrode materials of supercapacitor with high specific capacity and high stability. Three new Dawson-type POM-based metal–organic frameworks (POMOFs), [(Cu3(MPT)2(H2O)3)[P2W18O62]]·12H2O (CUST-831), [(Cu3(MPTD)2(H2O)7)[P2W18O62]]·6H2O (CUST-832) and [(Co2(HMPTZ)2(H2O)4)[P2W18O62]]·9H2O (CUST-833) have been successfully synthesized under hydrothermal conditions via tuning nitrogen heterocycles-based organic ligands. All three Dawson-type POMOFs exhibited impressive specific capacitance values of 225, 305, and 430F g−1, respectively, at a current density of 1 A g−1. The theoretical calculations and experiments indicated that the enhanced performance of CUST-833 is attributed to its higher proton conductivity. The two uncoordinated N atoms on the organic ligand in CUST-833 form a “conjugated acid-base pair” that facilitates rapid proton transport. This work provides new insights into the design and synthesis of proton-conducting materials based on POMs in their crystalline state for supercapacitors.
Published Version
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