A bulk Poly(vinyl alcohol)/ZIF-8(PVA/ZIF-8)porous composite with aligned porous structure was prepared by ice-templating method.The microstructure of PVA/ZIF-8 porous composites was characterized by scanning electron ...A bulk Poly(vinyl alcohol)/ZIF-8(PVA/ZIF-8)porous composite with aligned porous structure was prepared by ice-templating method.The microstructure of PVA/ZIF-8 porous composites was characterized by scanning electron microscopy(SEM).The results showed that the composites had regular pore structure and ZIF-8 nanoparticles were evenly distributed on the skeleton of PVA.X-ray diffraction(XRD)test results showed that the crystalline structure of ZIF-8 was well preserved in the composites.The specific surface area of the composite was characterized by nitrogen adsorption/desorption test.The specific surface area of the composite was up to 1160 m^2 g^1.PVA/ZIF-8 porous composites could also support a certain weight with almost no volume shrinkage.The carbon dioxide adsorption quantity of the composite was up to 11.3 cm^3 g^1,proving that PVA/ZIF-8 porous composite has a good application prospect in the field of carbon dioxide adsorption.展开更多
The widespread application of Li-rich manganese-based layered oxides(LROs),distinguished by their high energy density and low cost,is significantly constrained by voltage decay.The presently unresolved mechanism under...The widespread application of Li-rich manganese-based layered oxides(LROs),distinguished by their high energy density and low cost,is significantly constrained by voltage decay.The presently unresolved mechanism underlying this phenomenon impedes the development of effective countermeasures.Extensive research has established that voltage decay originates from irreversible oxygen release and structural evolution,but the relationship between these two factors remains incompletely characterized.This study investigates the impact of oxygen(O)redox and transition metal(TM)redox on voltage decay using Ni/Co-free Mn-full Li-rich layered oxides(MFLROs),which mitigates the confounding effects of concurrent Ni/Co redox and O redox.Electrochemical analysis demonstrates that stabilizing the O redox through Ti doping significantly inhibits voltage decay.Critically,multiple ex/in situ measurements and first-principles calculations reveal irreversible oxygen release as the dominant factor driving voltage decay.This insight establishes a foundational framework for addressing voltage decay in future research.展开更多
文摘A bulk Poly(vinyl alcohol)/ZIF-8(PVA/ZIF-8)porous composite with aligned porous structure was prepared by ice-templating method.The microstructure of PVA/ZIF-8 porous composites was characterized by scanning electron microscopy(SEM).The results showed that the composites had regular pore structure and ZIF-8 nanoparticles were evenly distributed on the skeleton of PVA.X-ray diffraction(XRD)test results showed that the crystalline structure of ZIF-8 was well preserved in the composites.The specific surface area of the composite was characterized by nitrogen adsorption/desorption test.The specific surface area of the composite was up to 1160 m^2 g^1.PVA/ZIF-8 porous composites could also support a certain weight with almost no volume shrinkage.The carbon dioxide adsorption quantity of the composite was up to 11.3 cm^3 g^1,proving that PVA/ZIF-8 porous composite has a good application prospect in the field of carbon dioxide adsorption.
基金financially supported by the National Natural Science Foundation of China(No.52371217)Hunan Provincial Science and Technology Innovation Plan Project(No.2024RC3217)+1 种基金the Applied Basic Research Fund of Guangdong Province(No.2024B1515020071)Guangdong Provincial Science and Technology Plan Project(No.2023A0505020009)
文摘The widespread application of Li-rich manganese-based layered oxides(LROs),distinguished by their high energy density and low cost,is significantly constrained by voltage decay.The presently unresolved mechanism underlying this phenomenon impedes the development of effective countermeasures.Extensive research has established that voltage decay originates from irreversible oxygen release and structural evolution,but the relationship between these two factors remains incompletely characterized.This study investigates the impact of oxygen(O)redox and transition metal(TM)redox on voltage decay using Ni/Co-free Mn-full Li-rich layered oxides(MFLROs),which mitigates the confounding effects of concurrent Ni/Co redox and O redox.Electrochemical analysis demonstrates that stabilizing the O redox through Ti doping significantly inhibits voltage decay.Critically,multiple ex/in situ measurements and first-principles calculations reveal irreversible oxygen release as the dominant factor driving voltage decay.This insight establishes a foundational framework for addressing voltage decay in future research.
