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One-Dimensional POM-Based Material Combining Proton Conductivity and Supercapacitor Performance: Synthesis; Characterization; and Performance Study
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DOI：10.1021/acs.inorgchem.6c02017.png)
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Abstract
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To address the performance deficiencies of conventional energy materials in proton conduction and energy storage, a one-dimensional hourglass-shaped P4Mo6-based polyoxometalate material was designed and synthesized, with the chemical formula (H2dpe)4[Fe2(H3P4Mo6O31)2]·6H2O (denoted as CUST-580, dpe = 1,2-bis(4-pyridyl)ethane). P4Mo6 clusters were interconnected via Fe ions to form a one-dimensional chain. In this structure, the terminal oxygen atoms of the clusters, free water molecules, and nitrogen atoms of the organic ligands collectively establish a dense hydrogen-bonding network. Proton conduction tests demonstrated that under the conditions of 90 °C and 98% relative humidity, the material achieved a conductivity of 4.01 × 10–3 S cm–1, which followed the Grotthuss conduction mechanism. It also retained structural integrity and long-term stability under various environmental conditions. When CUST-580 was mixed with carbon black and then loaded onto carbon cloth, it displayed typical pseudocapacitive behavior in the mixed electrolyte. At a current density of 1 A g–1, the specific capacitance of CUST-580 reached 361 F g–1, and the capacitance retention rate remained 85.21% after 1500 cycles. This material realized the synergistic optimization of proton conduction and supercapacitor performance, providing new candidate materials and design concepts for the development of high-performance energy conversion and storage devices.
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