Following publication of the original article[1],the authors found that they pasted the same data when drawing XRD for sample NCO-1 and NCO-2 in Fig.2a,however,the XRD of all four samples in the manuscript was tested,...Following publication of the original article[1],the authors found that they pasted the same data when drawing XRD for sample NCO-1 and NCO-2 in Fig.2a,however,the XRD of all four samples in the manuscript was tested,and XRD raw data were kept and can be offered.The correct Fig.2 has been provided in this Correction.展开更多
Cobalt nickel bimetallic oxides(NiCo_(2)O_(4))have received numerous attentions in terms of their controllable morphology,high temperature,corrosion resistance and strong electromagnetic wave(EMW)absorption capability...Cobalt nickel bimetallic oxides(NiCo_(2)O_(4))have received numerous attentions in terms of their controllable morphology,high temperature,corrosion resistance and strong electromagnetic wave(EMW)absorption capability.However,broadening the absorption bandwidth is still a huge challenge for NiCo_(2)O_(4)-based absorbers.Herein,the unique NiCo_(2)O_(4)@C core-shell microcubes with hollow structures were fabricated via a facile sacrificial template strategy.The concentration of oxygen vacancies and morphologies of the three-dimensional(3D)cubic hollow core-shell NiCo_(2)O_(4)@C framework were effectively optimized by adjusting the calcination temperature.The specially designed 3D framework structure facilitated the multiple reflections of incident electromagnetic waves and provided rich interfaces between multiple components,generating significant interfacial polarization losses.Dipole polarizations induced by oxygen vacancies could further enhance the attenuation ability for the incident EM waves.The optimized NiCo_(2)O_(4)@C hollow microcubes exhibit superior EMW absorption capability with minimum RL(RLmin)of-84.45 dB at 8.4 GHz for the thickness of 3.0 mm.Moreover,ultrabroad effective absorption bandwidth(EAB)as large as 12.48 GHz(5.52-18 GHz)is obtained.This work is believed to illuminate the path to synthesis of high-performance cobalt nickel bimetallic oxides for EMW absorbers with excellent EMW absorption capability,especially in broadening effective absorption bandwidth.展开更多
Binary transition metal oxides have attracted great attention as high-performance electrode materials for lithium-ion batteries in recent years.Herein,monodisperse NiCo_(2)O_(4)porous microcubes were prepared for the ...Binary transition metal oxides have attracted great attention as high-performance electrode materials for lithium-ion batteries in recent years.Herein,monodisperse NiCo_(2)O_(4)porous microcubes were prepared for the first time via a simple urea-assisted solvothermal method followed by a thermal decomposition process.The porous microcubes assembled by nanoparticles with a size of ca.35 nm have an average edge length of 1.5μm.Nitrogen sorption isotherms show that this structure possesses a high surface area of 26.26 m^(2)g^(−1)with an average pore diameter of 22.57 nm.The rich mesopores among NiCo_(2)O_(4)microcubes not only provide a large electrode/electrolyte reaction interface,but also provide enough void space to accommodate the volume change and prevent electronic disconnection in the electrode material during cycling.Furthermore,primary nanoparticles with a smaller size within microcubes can facilitate rapid Li-ion transport.So,when the as-prepared porous NiCo_(2)O_(4)microcubes are used as anode materials for Li-ion batteries,they exhibit high-rate capability and outstanding cyclability.展开更多
Iron sulfides possess a high theoretical capacity and rich natural abundance,making them promising anode materials for sodium-ion batteries(SIBs);however,their inferior rate of cycling performance stemming from intrin...Iron sulfides possess a high theoretical capacity and rich natural abundance,making them promising anode materials for sodium-ion batteries(SIBs);however,their inferior rate of cycling performance stemming from intrinsic inferior electrical conductivity and the huge volume change are the main hindrances to practical applications at present.Herein,spatially dual-confined Se-doped Fe7S8 multiple yolk–single shell(Se-Fe7S8@NC@C)microcubes are designed via heteroatom-doping and carbon confinement engineering.The yolk–shell structure provides sufficient void space to alleviate the effects of volume change;the dual-carbon layer acts as a rigid skeleton to ensure the structural integrity and confines active materials to avoid agglomeration during sodiation/desodiation.Meanwhile,the introduction of Se modulates the electronic structure,improving the electrical conductivity of the material and enlarging the interlayer distance to accelerate Na+diffusion.Accordingly,the as-prepared Se-Fe7S8@NC@C shows satisfactory sodium storage properties:a superb initial capacity of 828.5 mA h g^(−1) at 0.1 A g^(−1),an exceptional rate capability of 448.2 mA h g^(−1) at 5 A g^(−1) and an admirable cycling stability with 390.9 mA h g^(−1) at 5 A g^(−1) after 800 cycles.This study provides an innovative idea to fabricate advanced anodes for SIBs and other alkali metal-ion batteries by morphology design and electronic structure modulation.展开更多
With the growing development of the nuclear industry and the peaceful utilization of nuclear energy,the safe treatment and disposal of high-level wastes in nuclear waste management is still a major challenge.Overcomin...With the growing development of the nuclear industry and the peaceful utilization of nuclear energy,the safe treatment and disposal of high-level wastes in nuclear waste management is still a major challenge.Overcoming this issue requires developing highly efficient materials for capturing U(Ⅵ)from nuclear wastewater.Herein,magnetic porous microcubes with a graphitic shell and highly dispersed active cores(Fe/Fe_(3)C nanoparticles)are rationally designed and fabricated by simply annealing preformed polydopamine(PDA)coated Prussian blue(PB)microcubes.To assess the sorption properties,sequestration of U(Ⅵ)on N-doped metal/metal carbide nanoparticles encapsulated in a carbon matrix(N-doped Fe/Fe_(3)C@C)was systematically investigated using batch experiments.The sorption performance revealed that the N-doped Fe/Fe_(3)C@C samples exhibited highly efficient removal efficiency for U(Ⅵ),and the sample prepared at 800℃(N-doped Fe/Fe_(3)C@C-800)was the best among the series with a maximum sorption capacity of 203 mg g^(-1).The U(Ⅵ)adsorption and reduction by N-doped Fe/Fe_(3)C@C-800 were affected significantly by solution pH and concentrations of bicarbonate and calcium.The main reaction mechanism involved U(Ⅵ)reduction into insoluble U(Ⅳ)species by Fe^(0)/Fe(Ⅱ)and trapping the vip U(Ⅳ)in the porous carbon matrix,which synergistically promoted U(Ⅵ)removal from solution to N-doped Fe/Fe_(3)C@C-800.This study demonstrated the simple synthesis of magnetic N-doped Fe/Fe_(3)C@C derived from metal-organic frameworks and their potential application in U(Ⅵ)-contaminated wastewater remediation.展开更多
文摘Following publication of the original article[1],the authors found that they pasted the same data when drawing XRD for sample NCO-1 and NCO-2 in Fig.2a,however,the XRD of all four samples in the manuscript was tested,and XRD raw data were kept and can be offered.The correct Fig.2 has been provided in this Correction.
基金This work was supported by Natural Science Foundation of Shandong Province(ZR2022ME089)National Natural Science Foundation of China(52207249)Yantai Basic Research Project(2022JCYJ04).
文摘Cobalt nickel bimetallic oxides(NiCo_(2)O_(4))have received numerous attentions in terms of their controllable morphology,high temperature,corrosion resistance and strong electromagnetic wave(EMW)absorption capability.However,broadening the absorption bandwidth is still a huge challenge for NiCo_(2)O_(4)-based absorbers.Herein,the unique NiCo_(2)O_(4)@C core-shell microcubes with hollow structures were fabricated via a facile sacrificial template strategy.The concentration of oxygen vacancies and morphologies of the three-dimensional(3D)cubic hollow core-shell NiCo_(2)O_(4)@C framework were effectively optimized by adjusting the calcination temperature.The specially designed 3D framework structure facilitated the multiple reflections of incident electromagnetic waves and provided rich interfaces between multiple components,generating significant interfacial polarization losses.Dipole polarizations induced by oxygen vacancies could further enhance the attenuation ability for the incident EM waves.The optimized NiCo_(2)O_(4)@C hollow microcubes exhibit superior EMW absorption capability with minimum RL(RLmin)of-84.45 dB at 8.4 GHz for the thickness of 3.0 mm.Moreover,ultrabroad effective absorption bandwidth(EAB)as large as 12.48 GHz(5.52-18 GHz)is obtained.This work is believed to illuminate the path to synthesis of high-performance cobalt nickel bimetallic oxides for EMW absorbers with excellent EMW absorption capability,especially in broadening effective absorption bandwidth.
基金supported by the National Natural Science Foundation of China(no.21401061,51302102 and 11504120)the Natural Science Foundation of Anhui Province(1708085ME96 and 1608085QE90)+2 种基金the Key Natural Science Research Project for Colleges and Universities of Anhui Province(KJ2016A638 and KJ2016SD53)the Key Project of Anhui Universities Support Program for Outstanding Youth,China(no.gxyqZD2016111)the Huaibei Scientific Talent Development Scheme(20140305).
文摘Binary transition metal oxides have attracted great attention as high-performance electrode materials for lithium-ion batteries in recent years.Herein,monodisperse NiCo_(2)O_(4)porous microcubes were prepared for the first time via a simple urea-assisted solvothermal method followed by a thermal decomposition process.The porous microcubes assembled by nanoparticles with a size of ca.35 nm have an average edge length of 1.5μm.Nitrogen sorption isotherms show that this structure possesses a high surface area of 26.26 m^(2)g^(−1)with an average pore diameter of 22.57 nm.The rich mesopores among NiCo_(2)O_(4)microcubes not only provide a large electrode/electrolyte reaction interface,but also provide enough void space to accommodate the volume change and prevent electronic disconnection in the electrode material during cycling.Furthermore,primary nanoparticles with a smaller size within microcubes can facilitate rapid Li-ion transport.So,when the as-prepared porous NiCo_(2)O_(4)microcubes are used as anode materials for Li-ion batteries,they exhibit high-rate capability and outstanding cyclability.
基金supported by the Natural Science Foundation of Sichuan Province(2022NSFSC0222)the Sichuan Science and Technology Program(2023NSFSC0439).
文摘Iron sulfides possess a high theoretical capacity and rich natural abundance,making them promising anode materials for sodium-ion batteries(SIBs);however,their inferior rate of cycling performance stemming from intrinsic inferior electrical conductivity and the huge volume change are the main hindrances to practical applications at present.Herein,spatially dual-confined Se-doped Fe7S8 multiple yolk–single shell(Se-Fe7S8@NC@C)microcubes are designed via heteroatom-doping and carbon confinement engineering.The yolk–shell structure provides sufficient void space to alleviate the effects of volume change;the dual-carbon layer acts as a rigid skeleton to ensure the structural integrity and confines active materials to avoid agglomeration during sodiation/desodiation.Meanwhile,the introduction of Se modulates the electronic structure,improving the electrical conductivity of the material and enlarging the interlayer distance to accelerate Na+diffusion.Accordingly,the as-prepared Se-Fe7S8@NC@C shows satisfactory sodium storage properties:a superb initial capacity of 828.5 mA h g^(−1) at 0.1 A g^(−1),an exceptional rate capability of 448.2 mA h g^(−1) at 5 A g^(−1) and an admirable cycling stability with 390.9 mA h g^(−1) at 5 A g^(−1) after 800 cycles.This study provides an innovative idea to fabricate advanced anodes for SIBs and other alkali metal-ion batteries by morphology design and electronic structure modulation.
基金financial support of NSFC(91326202,21225730,21577032)the Priority Academic Program Development of Jiangsu Higher Education Institutions+1 种基金the Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsFundamental Research Funds for the Central Universities(JB2015001).
文摘With the growing development of the nuclear industry and the peaceful utilization of nuclear energy,the safe treatment and disposal of high-level wastes in nuclear waste management is still a major challenge.Overcoming this issue requires developing highly efficient materials for capturing U(Ⅵ)from nuclear wastewater.Herein,magnetic porous microcubes with a graphitic shell and highly dispersed active cores(Fe/Fe_(3)C nanoparticles)are rationally designed and fabricated by simply annealing preformed polydopamine(PDA)coated Prussian blue(PB)microcubes.To assess the sorption properties,sequestration of U(Ⅵ)on N-doped metal/metal carbide nanoparticles encapsulated in a carbon matrix(N-doped Fe/Fe_(3)C@C)was systematically investigated using batch experiments.The sorption performance revealed that the N-doped Fe/Fe_(3)C@C samples exhibited highly efficient removal efficiency for U(Ⅵ),and the sample prepared at 800℃(N-doped Fe/Fe_(3)C@C-800)was the best among the series with a maximum sorption capacity of 203 mg g^(-1).The U(Ⅵ)adsorption and reduction by N-doped Fe/Fe_(3)C@C-800 were affected significantly by solution pH and concentrations of bicarbonate and calcium.The main reaction mechanism involved U(Ⅵ)reduction into insoluble U(Ⅳ)species by Fe^(0)/Fe(Ⅱ)and trapping the vip U(Ⅳ)in the porous carbon matrix,which synergistically promoted U(Ⅵ)removal from solution to N-doped Fe/Fe_(3)C@C-800.This study demonstrated the simple synthesis of magnetic N-doped Fe/Fe_(3)C@C derived from metal-organic frameworks and their potential application in U(Ⅵ)-contaminated wastewater remediation.
