Owing to the rapid advancement of electric energy and energy storage devices,there exists an urgent demand for solid-state supercapacitors that possess high capacitance and safety features.Polyoxometalate(POM)-based c...Owing to the rapid advancement of electric energy and energy storage devices,there exists an urgent demand for solid-state supercapacitors that possess high capacitance and safety features.Polyoxometalate(POM)-based complexes are excellent candidates for electrode materials in the construction of solid-state SCs(SCs=supercapacitors),as they are capable of maintaining structural stability during the reversible redox reaction process.However,the poor conductivity of POM-based complexes cannot meet the requisite standards for solid-state SCs.In this study,two new POM-based complexes,H_(2){Co_(2)Py_(4)(H_(2)O)_(4)[Co_(2){Co[Mo_(6)O_(12)(OH)_(3)(HPO_(4))(PO_(4))_(3)]_(2)}]}·4DMF·10H_(2)O(1)and H_(6)Py_(2)[Mn_(2){Mn[Mo_(6)O_(12)(OH)_(3)(HPO_(4))_(4)]_(2)}]·6DMF·4H_(2)O(2)(Py=pyridine)were synthesised and the surface of POM-based electrodes were coated with a conductive polymer(PANI)via electrodeposition,resulting in a marked improvement in the transfer rates of electrolyte ions and electrons.The n@PANI-1 carbon paper electrodes were prepared and symmetrical solid-state capacitors(n@PANI-1-SCs)were assembled(in which n is the number of title complexes);their specific capacity could reach 58.166 mA h g^(−1) and 35.299 mA h g^(−1) at a current density of 0.2 A g^(−1).Moreover,the successful powering of the red LED for a duration of 0.5 min serves as a practical demonstration of the solid-state SC’s feasibility.Our new findings may provide some inspiration to develop new solid-state SCs for wearable electronics.展开更多
基金supported by the National Natural Science Foundation of China(No.21871042,21471028,21673098,21671036,and 22271023)Natural Science Foundation of Jilin Province(No.20200201083JC)+2 种基金Jilin Provincial Education Department(No.JJKH20201169KJ)the Fundamental Research Funds for the Central Universities(No.2412015KJ012,2412017BJ004)the support of Jilin Provincial Department of Education.
文摘Owing to the rapid advancement of electric energy and energy storage devices,there exists an urgent demand for solid-state supercapacitors that possess high capacitance and safety features.Polyoxometalate(POM)-based complexes are excellent candidates for electrode materials in the construction of solid-state SCs(SCs=supercapacitors),as they are capable of maintaining structural stability during the reversible redox reaction process.However,the poor conductivity of POM-based complexes cannot meet the requisite standards for solid-state SCs.In this study,two new POM-based complexes,H_(2){Co_(2)Py_(4)(H_(2)O)_(4)[Co_(2){Co[Mo_(6)O_(12)(OH)_(3)(HPO_(4))(PO_(4))_(3)]_(2)}]}·4DMF·10H_(2)O(1)and H_(6)Py_(2)[Mn_(2){Mn[Mo_(6)O_(12)(OH)_(3)(HPO_(4))_(4)]_(2)}]·6DMF·4H_(2)O(2)(Py=pyridine)were synthesised and the surface of POM-based electrodes were coated with a conductive polymer(PANI)via electrodeposition,resulting in a marked improvement in the transfer rates of electrolyte ions and electrons.The n@PANI-1 carbon paper electrodes were prepared and symmetrical solid-state capacitors(n@PANI-1-SCs)were assembled(in which n is the number of title complexes);their specific capacity could reach 58.166 mA h g^(−1) and 35.299 mA h g^(−1) at a current density of 0.2 A g^(−1).Moreover,the successful powering of the red LED for a duration of 0.5 min serves as a practical demonstration of the solid-state SC’s feasibility.Our new findings may provide some inspiration to develop new solid-state SCs for wearable electronics.
