Mesoporous carbon nanosheet-assembled flowers towards superior potassium storage

Potassium-ion batteries(PIBs)are attracted tremendous interest for large-scale energy storage systems(ESSs)owing to their economic merits.However,the main challenges of the PIBs are sluggish K-ion diffusion and large volume variations in the potassium repeated intercalation/deintercalation.Herein,mesoporous carbon nanosheet-assembled flowers(abbreviated as F-C)are designed as an original anode for superior-performance PIBs.Specifically,the F-C anode exhibits a high K-storage capacity(e.g.,381 mAh/g at 50 mA/g during the 2^(nd)cycle),excellent rate performance(e.g.,101 mAh/g at 2.0 A/g)and superior long cycle capability.Such excellent K-ion storage property is largely benefited from the large surface area(~141 m^(2)/g)and reasonable pore volume(0.465 cm^(3)/g),which not only stimulates rapid Kions diffusion and relieves the huge volume strain,but also exposes extensive active sites for K-ion capacitive storage.

Enhanced photothermal conversion in 3D stacked metal-organic framework nanosheets

Incorporating metal nanoparticles(MNPs)in metal–organic frameworks(MOFs)demonstrated great potential in thefield of photo-/photothermal-catalysis.How-ever,the oriented design and optimization of the 3D nano-architectures of MOF substrates to achieve high-efficiency light harvesting remains a challenge.Herein,guided on theoretical simulation,a facile etching strategy was employed to fab-ricate a 3D orderly-stacked-MOF-nanosheet-structure(CASFZU-1)with a high electricfield energy-density-distribution;well-dispersed MNPs were afterwards encapsulated onto the MOF support.The unique nanosheet structure improved the light absorbance over the broadband spectrum,thereby enhancing the plasmonic photothermal effects of the MNPs@CASFZU-1 composites.Based on the plasmon-driven photothermal conversion,the MNPs@CASFZU-1 composites exhibited approximately twofold catalytic efficiency in the hydrogenation reaction and a lower temperature for the full conversion of carbon monoxide,compared to their bulk-type composites.The surface-plasmon-driven photothermal effects can be exploited in innovative MNPs@MOF platforms for various applications.