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Highlights: [•] Novel linkages of ionic liquid. [•] New lanthanide hybrids of mesoporous silica with POMs. [•] Luminescence color integration. [ABSTRACT FROM AUTHOR]

Given its wide application ranges, dielectric capacitors have garnered extensive attentions. However, due to the excessive premature agglomeration of free electrons, capacitors with nanocomposites as dielectrics fail to attain high breakdown strength (E b), and thereby constrain their ability to achieve superior energy storage performances. To alleviate the effects of free electrons and secondary impact-ionized electrons (SIE) on E b and leakage currents, here, a novel organic-inorganic core–shell Ni(OH) 2 @PDI (N@P) nanofiller with opposite double-PN-junction was well-designed and successfully synthesized by coating p-typed Ni(OH) 2 nanosheets with n-typed perylene diimide (PDI). It could reduce free electron kinetic energy and mitigate SIE amounts regardless of the applied electric field direction. Furthermore, PDI, as an organic compound, can uniformly and densely coat onto surfaces of 2D Ni(OH) 2 , as well as enhance compatibilities between Ni(OH) 2 and matrix, and thereby reducing structure defects at their interfaces. Last but not the least, Ni(OH) 2 nanosheets also contribute to E b improvement via acting as scattering centers. Experimental and simulation results concurrently affirmed positive influences of organic-inorganic N@P nanofillers on discharge energy density (U d) and efficiency (η) of P(VDF-HFP)-based (PVH-based) nanocomposites. Remarkably, 1.3 vol% N@P/PVH achieves a high U d of 21.7 J/cm3 and η of 81.2 % under 569.0 MV/m. More importantly, it maintains an excellent energy storage performance throughout 104 cyclic tests. This study presents a valid strategy for concurrently improving U d and η of polymer-based nanocomposites. [ABSTRACT FROM AUTHOR]

Core-shell Mn 3 O 4 /carbon (Mn 3 O 4 @C) hybrid fiber are synthesized by encapsulating Mn 3 O 4 nanoparticles (NPs) in the hollow carbon fibers (Mn 3 O 4 @HCFs) according to the coaxial electrospinning technique. As the aqueous Zinc ion battery (ZIBs) cathode, the well-defined Mn 3 O 4 @HCFs with 12.7 wt % carbon exhibits superior rate capability (215.8 and 115.7 mAh g−1 at 0.3 and 2.0 A g−1, respectively) and excellent cycling stability (225 mAh g−1 remaining at the current density of 400 mA g−1 after 1300 cycles). The outstanding electrochemical performances are attributed to the core-shell structure of the Mn 3 O 4 @HCFs with much void spaces. The carbon framework on the surface of the Mn 3 O 4 NPs can not only relieve the volume expansion of Mn 3 O 4 during the discharging, but also optimize the electron transportation inside these fibers for the electrode. Furthermore, the amorphous carbon shell could also reduce the dissolution of the Mn 3 O 4 NPs during cycling. This work will provide a new pathway of a technique for enhancing the manganese-based cathode materials for the high-powered rechargeable aqueous ZIBs. [ABSTRACT FROM AUTHOR]