Li_(3)VO_4 has been considered as a promising insertion-type anode for lithium-ion batteries due to its high theoretical specific capacity and suitable operating voltage platform. However, this promising anode still s...Li_(3)VO_4 has been considered as a promising insertion-type anode for lithium-ion batteries due to its high theoretical specific capacity and suitable operating voltage platform. However, this promising anode still suffers from poor electrical conductivity. To address this issue, herein, a porous carbon supported Li_(3)VO_4 composites(Li_(3)VO_4/C) via a facile agitation-drying method combined with subsequent calcination is reported, in which Ketjen black carbon with high porosity, easy dispersion and excellent conductivity can serve as one of carbon sources. The Li_(3)VO_4/C composite prepared at 700 ℃ with a carbon content of~10% exhibits the optimized structure. The void space of the composite accommodates the volume changes during the charge/discharge process.Meanwhile, the carbon shell serves as a conductive skeleton to provide bi-continuous Li ions and electrons pathways. Electrochemical results reveal that the composite delivers a high initial discharge capacity of 572 m Ahág^(-1) and maintains a capacity of 442.9 m Ahág^(-1) after 100 cycles at 100 m Aág^(-1). Even at a high current density of 2 Aág^(-1), a considerable capacity of 243.8 m Ahág^(-1) can still be obtained. This work provides a promising approach for the practical application of Li_(3)VO_4 as anode material for LIBs.展开更多
As an acidic glycoprotein,carcinoembryonic antigen(CEA)is of great value as a broad-spectrum tumor marker in the differential diagnosis and surveillance of malignant tumors.In this work,we report an electrochemical ap...As an acidic glycoprotein,carcinoembryonic antigen(CEA)is of great value as a broad-spectrum tumor marker in the differential diagnosis and surveillance of malignant tumors.In this work,we report an electrochemical aptasensor for the ultrasensitive and highly selective detection of CEA,taking advantage of the dual amplification by the boronate affinity-assisted electrochemically controlled atom transfer radical polymerization(BA-eATRP).Specifically,the BAeATRP-based electrochemical aptasensing of CEA involves the capture of target antigens by nucleic acid aptamers,the covalent crosslinking of ATRP initiators to CEA antigens via the selective interactions between the phenylboronic acid(PBA)group and the cis-diol group of the monosaccharide residues,and the collection of the ferrocene(Fc)reporters via the eATRP of ferrocenylmethyl methacrylate(FcMMA).As CEA is decorated with hundreds of cis-diol groups,the BA-based crosslinking can result in the labeling of each CEA with hundreds of ATRP initiators;furthermore,the eATRP of FcMMA results in the surface-initiated growth of long-chain ferrocenyl polymers,leading to the tethering of each ATRP initiator-conjugated site with hundreds to thousands of Fc reporters.Such that,the BAeATRP can result in the efficient labeling of each CEA with a plenty of Fc reporters.Under the optimized conditions,the BA-eATRP-based strategy enables the highly selective aptasensing of CEA at a concentration as low as 0.34 pg·mL^(-1),with a linear range of 1.01000 pg·mL^(-1).Besides,this aptasensor has been successfully applied to the quantitative analysis of CEA in human serum.The BA-eATRP-based electrochemical aptasensor is cost-effective and simple in operation,holding broad application prospect in the ultrasensitive and highly selective detection of CEA.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos. 51874362 and51872334)the Natural Science Foundation of Hunan Province,China(No. 2018JJ1036)the National Key Research and Development Program of China (No. 2018YFB0104200)。
文摘Li_(3)VO_4 has been considered as a promising insertion-type anode for lithium-ion batteries due to its high theoretical specific capacity and suitable operating voltage platform. However, this promising anode still suffers from poor electrical conductivity. To address this issue, herein, a porous carbon supported Li_(3)VO_4 composites(Li_(3)VO_4/C) via a facile agitation-drying method combined with subsequent calcination is reported, in which Ketjen black carbon with high porosity, easy dispersion and excellent conductivity can serve as one of carbon sources. The Li_(3)VO_4/C composite prepared at 700 ℃ with a carbon content of~10% exhibits the optimized structure. The void space of the composite accommodates the volume changes during the charge/discharge process.Meanwhile, the carbon shell serves as a conductive skeleton to provide bi-continuous Li ions and electrons pathways. Electrochemical results reveal that the composite delivers a high initial discharge capacity of 572 m Ahág^(-1) and maintains a capacity of 442.9 m Ahág^(-1) after 100 cycles at 100 m Aág^(-1). Even at a high current density of 2 Aág^(-1), a considerable capacity of 243.8 m Ahág^(-1) can still be obtained. This work provides a promising approach for the practical application of Li_(3)VO_4 as anode material for LIBs.
基金This work was co-supported by the Guangdong Basic and Applied Basic Research Foundation(No.2022A1515010618)the Young Talent Support Project of Guangzhou Association for Science and Technology(No.QT-2023-009)+2 种基金the National Natural Science Foundation of China(No.21904026,21974031)the Guangzhou Science and Technology Project(No.202201010600,202201020170,202201000002)the Innovation Training Program for College Students of Guangzhou University(No.202211078113,S202111078031).
文摘As an acidic glycoprotein,carcinoembryonic antigen(CEA)is of great value as a broad-spectrum tumor marker in the differential diagnosis and surveillance of malignant tumors.In this work,we report an electrochemical aptasensor for the ultrasensitive and highly selective detection of CEA,taking advantage of the dual amplification by the boronate affinity-assisted electrochemically controlled atom transfer radical polymerization(BA-eATRP).Specifically,the BAeATRP-based electrochemical aptasensing of CEA involves the capture of target antigens by nucleic acid aptamers,the covalent crosslinking of ATRP initiators to CEA antigens via the selective interactions between the phenylboronic acid(PBA)group and the cis-diol group of the monosaccharide residues,and the collection of the ferrocene(Fc)reporters via the eATRP of ferrocenylmethyl methacrylate(FcMMA).As CEA is decorated with hundreds of cis-diol groups,the BA-based crosslinking can result in the labeling of each CEA with hundreds of ATRP initiators;furthermore,the eATRP of FcMMA results in the surface-initiated growth of long-chain ferrocenyl polymers,leading to the tethering of each ATRP initiator-conjugated site with hundreds to thousands of Fc reporters.Such that,the BAeATRP can result in the efficient labeling of each CEA with a plenty of Fc reporters.Under the optimized conditions,the BA-eATRP-based strategy enables the highly selective aptasensing of CEA at a concentration as low as 0.34 pg·mL^(-1),with a linear range of 1.01000 pg·mL^(-1).Besides,this aptasensor has been successfully applied to the quantitative analysis of CEA in human serum.The BA-eATRP-based electrochemical aptasensor is cost-effective and simple in operation,holding broad application prospect in the ultrasensitive and highly selective detection of CEA.
