The exploration of active and long-lived oxygen reduction reaction(ORR)catalysts for the commercialization of zinc-air batteries are of immense significance but challenging.Herein,the sulfur doped FeWO_(4)embedded in ...The exploration of active and long-lived oxygen reduction reaction(ORR)catalysts for the commercialization of zinc-air batteries are of immense significance but challenging.Herein,the sulfur doped FeWO_(4)embedded in the multi-dimensional nitrogen-doped carbon structure(S-FeWO_(4)/NC)was successfully synthesized.The doped S atoms optimized the charge distribution in FeWO_(4)and enhanced the intrinsic activity.At the same time,S doping accelerated the formation of reaction intermediates during the adsorption reduction of O_(2)on the surface of S-FeWO_(4)/NC.Accordingly,the S-FeWO_(4)/NC catalyst showed more positive half-wave potential(0.85 V)and better stability than that of the FeWO_(4)/NC catalyst.Furthermore,the S-FeWO_(4)/NC-based zinc-air battery exhibited considerable power density of 150.3m W cm^(-2),high specific capacity of 912.7 m A h g^(-1),and prominent cycle stability up to 220 h.This work provides an assistance to the development of cheap and efficient tungsten-based oxygen reduction catalysts and the promotion of its application in the zinc-air battery.展开更多
Fenton method combined with light to accelerate the production of free radicals from H2O2 can achieve more efficient pollutant degradation.In this paper,a novel BiOI/FeWO4 S-scheme heterojunction photocatalyst was obt...Fenton method combined with light to accelerate the production of free radicals from H2O2 can achieve more efficient pollutant degradation.In this paper,a novel BiOI/FeWO4 S-scheme heterojunction photocatalyst was obtained by in situ synthesis,which can activate H2O2 and degrade the organic pollutant OFC(ofloxacin)under visible light.The S-scheme charge transfer mechanism was confirmed by XPS spectroscopy,in situ KPFM and theoretical calculation.The photogenerated electrons were transferred from FeWO4 to BiOI driven by the built-in electric field and band bending,which inhibited carrier recombination and facilitated the activation of H2O2.The BiFe-5/Vis/H2O2 system degraded OFC up to 96.4%in 60 min.This study provides new systematic insights into the activation of H2O2 by S-scheme heterojunctions,which is of great significance for the treatment of antibiotic wastewater.展开更多
Alkaline phosphatase(ALP)activity and pyrophosphate ion(PPi)levels are remarkable for the human body functions such as signal transduction pathways and metabolism.Current quantitative methods mainly focus on developin...Alkaline phosphatase(ALP)activity and pyrophosphate ion(PPi)levels are remarkable for the human body functions such as signal transduction pathways and metabolism.Current quantitative methods mainly focus on developing complicated organic substrates or employing unstable metal ions as signal-regulated medium.Herein,we have developed a facile hydrothermal method for preparing Fe WO_(4)nanomaterials with intrinsic peroxidase-like activity and further confirmed that such a catalytic activity could be significantly enhanced by adjusting the size and oxygen vacancy content.More encouragingly,PPi can easily inhibit the catalytic activity of Fe WO_(4),whereas orthophosphate ions(Pi)cannot.Therefore,we constructed an Fe WO_(4)-based colorimetric assay for sensing PPi by means of the classical 3,3′,5,5′-tetramethylbenzidine-peroxidase chromogenic reaction.A facile and reliable ALP activity assay was also designed and developed because of the logical regulation of the peroxidase-like activity of Fe WO_(4)through the ALP-catalyzed hydrolysis of PPi into Pi.Based on the clear mechanism and mimetic-enzyme Fe WO_(4)-catalyzed amplification,the sensing system exhibited excellent performance and was able to evaluate ALP activity in real serum samples and screen for potential ALP inhibitors.The proposed mimetic enzyme-involved colorimetric assay provides an alternative pathway,and Fe WO_(4)nanomaterials with excellent performance have great potential for further biosensing and biomedical applications.展开更多
基金the support of the National Natural Science Foundation of China(Nos.22178148,U21A20328)the Natural Science Foundation of Jiangsu Province(No.BK20191430)+2 种基金the Six Talent Peaks Project in Jiangsu Province(No.XNY-009)the Jiangsu Province and Education Ministry CoSponsored Synergistic Innovation Center of Modern Agricultural Equipment(No.XTCX2029)a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions。
文摘The exploration of active and long-lived oxygen reduction reaction(ORR)catalysts for the commercialization of zinc-air batteries are of immense significance but challenging.Herein,the sulfur doped FeWO_(4)embedded in the multi-dimensional nitrogen-doped carbon structure(S-FeWO_(4)/NC)was successfully synthesized.The doped S atoms optimized the charge distribution in FeWO_(4)and enhanced the intrinsic activity.At the same time,S doping accelerated the formation of reaction intermediates during the adsorption reduction of O_(2)on the surface of S-FeWO_(4)/NC.Accordingly,the S-FeWO_(4)/NC catalyst showed more positive half-wave potential(0.85 V)and better stability than that of the FeWO_(4)/NC catalyst.Furthermore,the S-FeWO_(4)/NC-based zinc-air battery exhibited considerable power density of 150.3m W cm^(-2),high specific capacity of 912.7 m A h g^(-1),and prominent cycle stability up to 220 h.This work provides an assistance to the development of cheap and efficient tungsten-based oxygen reduction catalysts and the promotion of its application in the zinc-air battery.
基金supported by the National Key Research and Development Program of China(2020YFD1100501)Thanks zkec(www.zjkec.cc)for XRD.
文摘Fenton method combined with light to accelerate the production of free radicals from H2O2 can achieve more efficient pollutant degradation.In this paper,a novel BiOI/FeWO4 S-scheme heterojunction photocatalyst was obtained by in situ synthesis,which can activate H2O2 and degrade the organic pollutant OFC(ofloxacin)under visible light.The S-scheme charge transfer mechanism was confirmed by XPS spectroscopy,in situ KPFM and theoretical calculation.The photogenerated electrons were transferred from FeWO4 to BiOI driven by the built-in electric field and band bending,which inhibited carrier recombination and facilitated the activation of H2O2.The BiFe-5/Vis/H2O2 system degraded OFC up to 96.4%in 60 min.This study provides new systematic insights into the activation of H2O2 by S-scheme heterojunctions,which is of great significance for the treatment of antibiotic wastewater.
基金supported by the National Natural Science Foundation of China(21974132,22034006,21721003)the Open Project of State Key Laboratory of Supramolecular Structure and Materials(sklssm2023021)。
文摘Alkaline phosphatase(ALP)activity and pyrophosphate ion(PPi)levels are remarkable for the human body functions such as signal transduction pathways and metabolism.Current quantitative methods mainly focus on developing complicated organic substrates or employing unstable metal ions as signal-regulated medium.Herein,we have developed a facile hydrothermal method for preparing Fe WO_(4)nanomaterials with intrinsic peroxidase-like activity and further confirmed that such a catalytic activity could be significantly enhanced by adjusting the size and oxygen vacancy content.More encouragingly,PPi can easily inhibit the catalytic activity of Fe WO_(4),whereas orthophosphate ions(Pi)cannot.Therefore,we constructed an Fe WO_(4)-based colorimetric assay for sensing PPi by means of the classical 3,3′,5,5′-tetramethylbenzidine-peroxidase chromogenic reaction.A facile and reliable ALP activity assay was also designed and developed because of the logical regulation of the peroxidase-like activity of Fe WO_(4)through the ALP-catalyzed hydrolysis of PPi into Pi.Based on the clear mechanism and mimetic-enzyme Fe WO_(4)-catalyzed amplification,the sensing system exhibited excellent performance and was able to evaluate ALP activity in real serum samples and screen for potential ALP inhibitors.The proposed mimetic enzyme-involved colorimetric assay provides an alternative pathway,and Fe WO_(4)nanomaterials with excellent performance have great potential for further biosensing and biomedical applications.
