The oxygen evolution reaction(OER) is the cornerstone for many important energy conversion devices, including metal–air battery and water splitting.Herein, an optimized NiFe-based metal–organic framework is develope...The oxygen evolution reaction(OER) is the cornerstone for many important energy conversion devices, including metal–air battery and water splitting.Herein, an optimized NiFe-based metal–organic framework is developed as highly efficient active material for OER. It just needs a low overpotential of 0.31 V to deliver a current density of 10 mA cm-2 with a favorable Tafel slope of 43.7 mV dec-1 in 0.1 M KOH electrolyte for the as-prepared Ni0.75Fe0.25 BDC, which is superior to RuO2. This efficient catalytic performance is due to the introduction of Fe in Ni-based MOFs could benefit the kinetics and charge transfer efficiency, resulting in the optimal activity toward OER. Besides, the obtained active material demonstrates good stability, suggesting the great potential value in sustainable electrochemical energy storage and conversion devices.展开更多
Objectives:With the increasing damage caused by foodborne pathogens to human health and the increasing attention given to healthy diets,novel food antimicrobial agents have been widely studied.Materials and Methods:In...Objectives:With the increasing damage caused by foodborne pathogens to human health and the increasing attention given to healthy diets,novel food antimicrobial agents have been widely studied.Materials and Methods:In this study,three different morphologies of citral-modified ZnO nanoparticle antimicrobial materials were prepared,and the citral-modified porous ZnO nanorod antimicrobial materials with the highest loading(60.35%)and the strongest inhibitory effect(MIC=0.2-0.1 mg/mL)were screened through a series of characterization and bacterial inhibition experiments.This novel antimicrobial material has excellent and long-lasting antimicrobial properties.It inhibited Escherichia coliby 100% when stowed at 25℃ and protected from light for 10 d and inhibited the growth of E.coli by 58.17% after being stowed under the same conditions for 60 d.Furthermore,we tested the pH change during 24 h of E.coli growth and the pH responsiveness of the materials.Results:The results demonstrated that under the acid-producing condition of E.coli growth,the pH-sensitive imine bond(-CH=N-)formed by the condensation of the amino of functionalized ZnO nanoparticles and citral was hydrolyzed to release the citral,which indicated that the release mechanism of citral in the antibacterial material was pH-sensitive.Conclusions:The antibacterial materials in this study have broad application prospects in the field of food production and packaging in the future.Moreover,this study provides a theoretical basis for guaranteeing food quality and safety.展开更多
基金supported by The Thousand Talents Plan Foundation of China and Guangdong ProvinceThe 100 Talents Plan Foundation of Sun Yat-sen University (31000-18821107)+2 种基金the Program for Guangdong Introducing Innovative and Enterpreneurial Teams (2017ZT07C069)the NSFC Projects (21573291, 21720102007)the STP Project of Guangzhou (201504010031)
文摘The oxygen evolution reaction(OER) is the cornerstone for many important energy conversion devices, including metal–air battery and water splitting.Herein, an optimized NiFe-based metal–organic framework is developed as highly efficient active material for OER. It just needs a low overpotential of 0.31 V to deliver a current density of 10 mA cm-2 with a favorable Tafel slope of 43.7 mV dec-1 in 0.1 M KOH electrolyte for the as-prepared Ni0.75Fe0.25 BDC, which is superior to RuO2. This efficient catalytic performance is due to the introduction of Fe in Ni-based MOFs could benefit the kinetics and charge transfer efficiency, resulting in the optimal activity toward OER. Besides, the obtained active material demonstrates good stability, suggesting the great potential value in sustainable electrochemical energy storage and conversion devices.
基金funded by the National Natural Science Foundation of China(No.32272399).
文摘Objectives:With the increasing damage caused by foodborne pathogens to human health and the increasing attention given to healthy diets,novel food antimicrobial agents have been widely studied.Materials and Methods:In this study,three different morphologies of citral-modified ZnO nanoparticle antimicrobial materials were prepared,and the citral-modified porous ZnO nanorod antimicrobial materials with the highest loading(60.35%)and the strongest inhibitory effect(MIC=0.2-0.1 mg/mL)were screened through a series of characterization and bacterial inhibition experiments.This novel antimicrobial material has excellent and long-lasting antimicrobial properties.It inhibited Escherichia coliby 100% when stowed at 25℃ and protected from light for 10 d and inhibited the growth of E.coli by 58.17% after being stowed under the same conditions for 60 d.Furthermore,we tested the pH change during 24 h of E.coli growth and the pH responsiveness of the materials.Results:The results demonstrated that under the acid-producing condition of E.coli growth,the pH-sensitive imine bond(-CH=N-)formed by the condensation of the amino of functionalized ZnO nanoparticles and citral was hydrolyzed to release the citral,which indicated that the release mechanism of citral in the antibacterial material was pH-sensitive.Conclusions:The antibacterial materials in this study have broad application prospects in the field of food production and packaging in the future.Moreover,this study provides a theoretical basis for guaranteeing food quality and safety.
