Thermal batteries are a type of thermally activated reserve battery,where the cathode material significantly influences the operating voltage and specific capacity.In this work,Cu_(2)O–CuO nanowires are prepared by i...Thermal batteries are a type of thermally activated reserve battery,where the cathode material significantly influences the operating voltage and specific capacity.In this work,Cu_(2)O–CuO nanowires are prepared by in-situ thermal oxidation method onto Cu foam,which are further coated with a carbon layer derived from polydopamine(PDA).The morphology of the nanowires has been examined using scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The material shows a kind of core–shell structure,with CuO as the shell and Cu_(2)O as the core.To further explore the interaction between the material and lithium-ion(Li^(+)),the Lit adsorption energies of CuO and Cu_(2)O were calculated,revealing a stronger affinity of Li^(+) for CuO.The unique core–shell nanowire structure of Cu_(2)O–CuO can provide a good Li^(+)adsorption with the outer layer CuO and excellent structural stability with the inner layer Cu_(2)O.When applied in thermal batteries,Cu_(2)O–CuO–C nanowires exhibit specific capacity and specific energy of 326 mAh g^(-1)and 697 Wh kg^(-1)at a cut-off voltage of 1.5 V both of which are higher than those of Cu_(2)O–CuO(238 mAh g^(-1)and 445 Wh kg^(-1)).The discharge process includes the insertion of lithium ions and subsequent reduction reactions,ultimately resulting in the formation of lithium oxide and copper.展开更多
The introduction of fillers boosts the performance of polymer coatings and extends their service life.However,single component fillers are not sufficient for intelligent coatings,and compatibility between the polymer ...The introduction of fillers boosts the performance of polymer coatings and extends their service life.However,single component fillers are not sufficient for intelligent coatings,and compatibility between the polymer matrix and the filler remains a major challenge.In this study,functional polydopamine(PDA)modified CeO_(2)/sodium-based montmorillonite(Na-MMT)or CeO_(2)/calcium-based montmorillonite(Ca-MMT)fillers were designed and fabricated via facile in-situ method.The coatings incorporated with MMT-based fillers that were prepared demonstrated remarkable anti-corrosion capabilities,exceptional antimicrobial resistance,and rapid selfhealing properties.Specific ally,the low-frequency impedance(|Z|_(0.01Hz))values of PDA/CeO_(2)/Na-MMT/EP and PDA/CeO_(2)/Ca-MMT/EP,after being immersed for 30 days,were sustained at 2.24×10^(7)and 1.70×10^(7)Ωcm^(2),respectively.Additionally,the bacteriostatic rates of the filler against E.coli and S.aureus can both reach above 99.9%,respectively,due to the photothermal effect and synergistic bacteriostatic mechanism of PDA and CeO_(2).The scratches healed rapidly within 40 s under near-infrared(NIR)irradiation.This work provides valuable guidance for the utilization of MMT-based sheet fillers for enhanced corrosion-resistant,antimicrobial,and repairable coatings.展开更多
基金supported by National Natural Science Foundation of China(Nos.52374298)National Natural Science Foundation of Chongqing(Nos.CSTB2023NSCQ-MSX0662)Beijing Natural Science Foundation(Nos.L243019).
文摘Thermal batteries are a type of thermally activated reserve battery,where the cathode material significantly influences the operating voltage and specific capacity.In this work,Cu_(2)O–CuO nanowires are prepared by in-situ thermal oxidation method onto Cu foam,which are further coated with a carbon layer derived from polydopamine(PDA).The morphology of the nanowires has been examined using scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The material shows a kind of core–shell structure,with CuO as the shell and Cu_(2)O as the core.To further explore the interaction between the material and lithium-ion(Li^(+)),the Lit adsorption energies of CuO and Cu_(2)O were calculated,revealing a stronger affinity of Li^(+) for CuO.The unique core–shell nanowire structure of Cu_(2)O–CuO can provide a good Li^(+)adsorption with the outer layer CuO and excellent structural stability with the inner layer Cu_(2)O.When applied in thermal batteries,Cu_(2)O–CuO–C nanowires exhibit specific capacity and specific energy of 326 mAh g^(-1)and 697 Wh kg^(-1)at a cut-off voltage of 1.5 V both of which are higher than those of Cu_(2)O–CuO(238 mAh g^(-1)and 445 Wh kg^(-1)).The discharge process includes the insertion of lithium ions and subsequent reduction reactions,ultimately resulting in the formation of lithium oxide and copper.
基金financially supported by the National Natural Science Foundation of China(No.52261045)Hainan Provincial Natural Science Foundation of China(No.625QN266)the Scientific Research Starting Foundation of Hainan University(No.XJ2400005319)
文摘The introduction of fillers boosts the performance of polymer coatings and extends their service life.However,single component fillers are not sufficient for intelligent coatings,and compatibility between the polymer matrix and the filler remains a major challenge.In this study,functional polydopamine(PDA)modified CeO_(2)/sodium-based montmorillonite(Na-MMT)or CeO_(2)/calcium-based montmorillonite(Ca-MMT)fillers were designed and fabricated via facile in-situ method.The coatings incorporated with MMT-based fillers that were prepared demonstrated remarkable anti-corrosion capabilities,exceptional antimicrobial resistance,and rapid selfhealing properties.Specific ally,the low-frequency impedance(|Z|_(0.01Hz))values of PDA/CeO_(2)/Na-MMT/EP and PDA/CeO_(2)/Ca-MMT/EP,after being immersed for 30 days,were sustained at 2.24×10^(7)and 1.70×10^(7)Ωcm^(2),respectively.Additionally,the bacteriostatic rates of the filler against E.coli and S.aureus can both reach above 99.9%,respectively,due to the photothermal effect and synergistic bacteriostatic mechanism of PDA and CeO_(2).The scratches healed rapidly within 40 s under near-infrared(NIR)irradiation.This work provides valuable guidance for the utilization of MMT-based sheet fillers for enhanced corrosion-resistant,antimicrobial,and repairable coatings.
