Magnesium metal batteries(MMBs)are considered one of the most promising candidates for the postlithium era but face significant challenges,including non-uniform plating,irregular stripping,and interface passivation.He...Magnesium metal batteries(MMBs)are considered one of the most promising candidates for the postlithium era but face significant challenges,including non-uniform plating,irregular stripping,and interface passivation.Herein,we have developed a highly reversible,passivation-free,and corrosion-resistant Mg metal anode by integrating a Mg-rich LAPONITE®(Mg-RL)interface protective layer using a doctorblading technique.The Mg-RL interface protective layer,with its negatively charged interlayer structure,creates abundant cation transport channels and isolates direct contact between the electrolyte and anode,thus facilitating highly reversible Mg plating/stripping while suppressing anode passivation.As a result,Mg-RL/Mg-based symmetric cells exhibit exceptional cycling stability,maintaining over 1500 h in APC electrolyte and 800 h in Mg(TFSI)_(2) electrolyte under practical current densities and area capacities.Furthermore,the corresponding Mo_(6)S_(8)-based full cells demonstrate excellent electrochemical performance,and the Mg–S pouch cells successfully power a toy car,demonstrating practical viability.This study presents a simple,cost-effective strategy for constructing artificial interface protective layers of Mg metal anodes,advancing the development of stable and safe MMBs.展开更多
In this report,we have successfully prepared the hexammine cobalt(Ⅲ)coordination complex[Co(NH_(3))_(6)]^(3+)grafted onto a reduced graphene oxide(RGO)composite modified glassy carbon electrode(GCE)for the electroche...In this report,we have successfully prepared the hexammine cobalt(Ⅲ)coordination complex[Co(NH_(3))_(6)]^(3+)grafted onto a reduced graphene oxide(RGO)composite modified glassy carbon electrode(GCE)for the electrochemical determination of morin(MR).The RGO/[Co(NH_(3))_(6)]^(3+)composite was prepared by a simple sonochemical technique.The as-prepared inorganic complex was characterized using suitable physical and chemical characterization techniques.The as-prepared composite was characterized by scanning electron microscopy,elemental mapping analysis and X-ray diffraction studies.In addition,the electrochemical performance of the fabricated electrode was assessed by the cyclic voltammetry,differential pulse voltammetry and electrochemical impedance spectroscopy studies.Besides,the RGO/[Co(NH_(3))_(6)]^(3+)modified electrode had notable electrocatalytic activity towards the detection of MR.Under the optimized condition,the modified electrode showed excellent linearity ranges,acceptable limit of detection,and high sensitivity of 0.008-72.35μM,1.0 nM and 4.326μAμM^(-1)cm^(-2),respectively.The fabricated electrode exhibited acceptable repeatability,reproducibility and stability.On the other hand,the proposed RGO/[Co(NH_(3))_(6)]^(3+)modified electrodes have been applied for the detection of MR in fruit samples,and the results reveal adequate recovery.展开更多
Direct methanol fuel cells(DMFCs)are considered favorable for portable devices due to their high energy density and the widespread availability of methanol fuel.However,the commercialization of DMFCs has been severely...Direct methanol fuel cells(DMFCs)are considered favorable for portable devices due to their high energy density and the widespread availability of methanol fuel.However,the commercialization of DMFCs has been severely limited by the sluggish reaction kinetics and poor stability of the anode.In this study,compressively strained PtRu alloy nanoparticles were deposited on a nanoporous thin film(NPTF)using a differential normal pulse voltammetry technique.The resulting compressive structure is confirmed through geometrical phase analysis,revealing high-level compressive strains of about−5%.Owing to the improved specific activity and high specific surface area,the compressively strained PtRu alloy nanoparticles exhibit outstanding Pt mass activities for methanol oxidation reaction.NPTF-Pt2Ru1 with a Pt/Ru molar ratio of 2/1 exhibits the highest Pt mass activity(1.64 A mg_(Pt)^(-1)),approximately 4 times higher than that of commercial PtRu/C.When applied in membrane electrode assembly,this film anode in DMFCs further exhibits mass activity enhancement owing to the structural advantages such as weakened methanol cross-over.With a loading of 0.21 mg_(Pt)cm^(-2),the maximum power density at 80℃reaches 117 mW cm^(-2),and the power efficiency of Pt is about 12 times higher than that of commercial PtRu/C(2 mg_(Pt)cm^(-2),92 mW cm^(-2)).Therefore,the methodology outlined in this study demonstrates a novel and effective means of synthesizing high-performance anode catalysts for DMFCs.展开更多
基金sponsored by the National Natural Science Foundation of China(22279104 and 62288102)the National Key Research and Development Program of China(2020YFA0709900)the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(CX2024031).
文摘Magnesium metal batteries(MMBs)are considered one of the most promising candidates for the postlithium era but face significant challenges,including non-uniform plating,irregular stripping,and interface passivation.Herein,we have developed a highly reversible,passivation-free,and corrosion-resistant Mg metal anode by integrating a Mg-rich LAPONITE®(Mg-RL)interface protective layer using a doctorblading technique.The Mg-RL interface protective layer,with its negatively charged interlayer structure,creates abundant cation transport channels and isolates direct contact between the electrolyte and anode,thus facilitating highly reversible Mg plating/stripping while suppressing anode passivation.As a result,Mg-RL/Mg-based symmetric cells exhibit exceptional cycling stability,maintaining over 1500 h in APC electrolyte and 800 h in Mg(TFSI)_(2) electrolyte under practical current densities and area capacities.Furthermore,the corresponding Mo_(6)S_(8)-based full cells demonstrate excellent electrochemical performance,and the Mg–S pouch cells successfully power a toy car,demonstrating practical viability.This study presents a simple,cost-effective strategy for constructing artificial interface protective layers of Mg metal anodes,advancing the development of stable and safe MMBs.
文摘In this report,we have successfully prepared the hexammine cobalt(Ⅲ)coordination complex[Co(NH_(3))_(6)]^(3+)grafted onto a reduced graphene oxide(RGO)composite modified glassy carbon electrode(GCE)for the electrochemical determination of morin(MR).The RGO/[Co(NH_(3))_(6)]^(3+)composite was prepared by a simple sonochemical technique.The as-prepared inorganic complex was characterized using suitable physical and chemical characterization techniques.The as-prepared composite was characterized by scanning electron microscopy,elemental mapping analysis and X-ray diffraction studies.In addition,the electrochemical performance of the fabricated electrode was assessed by the cyclic voltammetry,differential pulse voltammetry and electrochemical impedance spectroscopy studies.Besides,the RGO/[Co(NH_(3))_(6)]^(3+)modified electrode had notable electrocatalytic activity towards the detection of MR.Under the optimized condition,the modified electrode showed excellent linearity ranges,acceptable limit of detection,and high sensitivity of 0.008-72.35μM,1.0 nM and 4.326μAμM^(-1)cm^(-2),respectively.The fabricated electrode exhibited acceptable repeatability,reproducibility and stability.On the other hand,the proposed RGO/[Co(NH_(3))_(6)]^(3+)modified electrodes have been applied for the detection of MR in fruit samples,and the results reveal adequate recovery.
基金financially supported by the National Natural Science Foundation of China(No.U2102214)。
文摘Direct methanol fuel cells(DMFCs)are considered favorable for portable devices due to their high energy density and the widespread availability of methanol fuel.However,the commercialization of DMFCs has been severely limited by the sluggish reaction kinetics and poor stability of the anode.In this study,compressively strained PtRu alloy nanoparticles were deposited on a nanoporous thin film(NPTF)using a differential normal pulse voltammetry technique.The resulting compressive structure is confirmed through geometrical phase analysis,revealing high-level compressive strains of about−5%.Owing to the improved specific activity and high specific surface area,the compressively strained PtRu alloy nanoparticles exhibit outstanding Pt mass activities for methanol oxidation reaction.NPTF-Pt2Ru1 with a Pt/Ru molar ratio of 2/1 exhibits the highest Pt mass activity(1.64 A mg_(Pt)^(-1)),approximately 4 times higher than that of commercial PtRu/C.When applied in membrane electrode assembly,this film anode in DMFCs further exhibits mass activity enhancement owing to the structural advantages such as weakened methanol cross-over.With a loading of 0.21 mg_(Pt)cm^(-2),the maximum power density at 80℃reaches 117 mW cm^(-2),and the power efficiency of Pt is about 12 times higher than that of commercial PtRu/C(2 mg_(Pt)cm^(-2),92 mW cm^(-2)).Therefore,the methodology outlined in this study demonstrates a novel and effective means of synthesizing high-performance anode catalysts for DMFCs.
