Metallic few-layered 1T-VS_(2)nanosheets for enhanced sodium storage

Metallic few-layered 1T phase vanadium disulfide nanosheets have been employed for boosting sodium ion batteries.It can deliver a capacity of 241 mAh∙g^(−1)at 100 mA∙g^(−1)after 200 cycles.Such long-term stability is attributed to the facile ion diffusion and electron transport resulting from the well-designed two-dimensional(2D)electron-electron correlations among V atoms in the 1T phase and optimized in-planar electric transport.Our results highlight the phase engineering into electrode design for energy storage.

Bimetallic Pd-Cu/Al_(2)O_(3) Catalyst for the Green Catalytic Synthesis of 2,2'-bipyridine from Pyridine

Bimetallic Pd-Cu/Al_(2)O_(3) was prepared by wetness impregnation method and its catalytic activity on coupling reaction of pyridine to 2,2'-bipyridine was assessed in view of the effects of different molar ratios of Pd:Cu.It is found that Pd-Cu/Al_(2)O_(3) has the small particle size and good dispersion through the characterization.Compared with Pd/Al_(2)O_(3),Pd-Cu(1:2)/Al_(2)O_(3) is the preferable catalyst under the optimum conditions of 1 MPa N2 pressure,310℃and 16 h.The conversion of pyridine is 35.4%,and the selectivity for 2,2'-Bipyridine is up to 99%,which is much higher activity than Pd/Al_(2)O_(3).The directly coupled synthesis meets the requirements of the atomic economy better.The addition of Cu also reduces the dosage of Pd and lowers the cost.It is worth noting that the recycled Pd-Cu/Al_(2)O_(3) catalyst still shows high activity and stability after three times.

A Method for Solving Textile Production Scheduling Problem

The modern textile production is driven by order forms, in which continuous and discrete characteristics both exist. Hybrid Petri net (HPN) was selected to build the textile production model that described all operations in a uniform form, and connected them by discrete places and inhibitor arcs. Based on this structured model, the mathematical programming description was given. In order to take the minimal costs and complete all order forms in due time, genetic algorithm (GA) was used to optimize the production scheduling scheme. Using the data from a textile enterprise, the simulation proves that the proposed method is effective.

Floret-like Fe-N_(x)nanoparticle-embedded porous carbon superstructures from a Fe-covalent triazine polymer boosting oxygen electroreduction

Fe–N_(x)nanoparticles-embedded porous carbons with a desirable superstructure have attracted immense attention as promising catalysts for electrochemical oxygen reduction reaction.Herein,we employed Fe-coordinated covalent triazine polymer for the fabrication of Fe–N_(x)nanoparticle-embedded porous carbon nanoflorets(Fe/N@CNFs)employing a hypersaline-confinement-conversion strategy.Presence of tailored N types within the covalent triazine polymer interwork in high proportions contributes to the generation of Fe/N coordination and subsequent Fe–N_(x)nanoparticles.Owing to the utilization of NaCl crystals,the resultant Fe/N@CNF-800 which was generated by pyrolysis at 800℃showed nanoflower structure and large specific surface area,which remarkably suppressed the agglomeration of high catalytic active sites.As expect,the Fe/N@CNF-800 exhibited unexpected oxygen reduction reaction catalytic performance with an ultrahigh half-wave potential(0.89 V vs.reversible hydrogen electrode),a dominant 4e–transfer approach and great cycle stability(>92%after 100000 s).As a demonstration,the Fe/N-PCNF-800-assembled zinc–air battery delivered a high open circuit voltage of 1.51 V,a maximum peak power density of 164 mW·cm^(-2),as well as eminent rate performance,surpassing those of commercial Pt/C.This contribution offers a valuable avenue to exploit efficient metal nanoparticles-based carbon catalysts towards energy-related electrocatalytic reactions and beyond.