利用水热合成法合成了分子组成为(C6H11NH3)5H(P2Mo5O23)4H2O的杂多化合物, 用单晶X-ray衍射方法测定了它的结构,该晶体属于单斜晶系,空间群P21/c, a = 12.830(3), b = 14.848(3), c = 25.258(5) ? b = 92.95(3), Mr = 1483.62, V = 48...利用水热合成法合成了分子组成为(C6H11NH3)5H(P2Mo5O23)4H2O的杂多化合物, 用单晶X-ray衍射方法测定了它的结构,该晶体属于单斜晶系,空间群P21/c, a = 12.830(3), b = 14.848(3), c = 25.258(5) ? b = 92.95(3), Mr = 1483.62, V = 4805.1(17) 3, Z = 4, Dc = 2.051 g/cm3, m = 1.431 mm-1, F(000) = 3000, I >2s(I) 的可观察衍射点4426个, 最终结构偏差因子R = 0.0464, wR = 0.0801, S = 0.731。在[P2Mo5O23]6-杂多阴离子中5个MoO6八面体通过共边和共角相连, 形成1个近似的五角平面骨架, 2个PO4四面体加在五角平面的两侧。热性质研究表明杂多阴离子骨架在547.4 ℃左右分解。展开更多
采用溶胶凝胶法制备了Sr_2Bi_5Fe Ti_5O_(21)(SBFTi)陶瓷,测试了SBFTi陶瓷室温~500℃范围内的介温谱、交流阻抗以及交流电导率,对其进行了分析。结果表明:SBFTi陶瓷的介电常数比Sr_2Bi_4Ti_5O_(18)高,频率稳定性好,具有弥散型铁电体的特...采用溶胶凝胶法制备了Sr_2Bi_5Fe Ti_5O_(21)(SBFTi)陶瓷,测试了SBFTi陶瓷室温~500℃范围内的介温谱、交流阻抗以及交流电导率,对其进行了分析。结果表明:SBFTi陶瓷的介电常数比Sr_2Bi_4Ti_5O_(18)高,频率稳定性好,具有弥散型铁电体的特征;SBFTi陶瓷的电学结构比较均匀,宏观电阻具有负温度系数特征并主要来源于晶粒的作用;在200~480℃温度范围内,SBFTi陶瓷的电导激活能为0.6 e V,氧空位为SBFTi陶瓷的主要载流子。展开更多
Layered V_(2)O_(5) cathode holds the merits of high theoretical specific capacity(589 mA h g^(-1))in aqueous zinc-ion batteries(AZIBs),yet it still suffers from inferior bulk conductivity and structure degradation not...Layered V_(2)O_(5) cathode holds the merits of high theoretical specific capacity(589 mA h g^(-1))in aqueous zinc-ion batteries(AZIBs),yet it still suffers from inferior bulk conductivity and structure degradation notably during prolonged cycling.Herein,we ingeniously design cations(Na^(+)/Co^(2+)/Al^(3+))and anion(F^(-))synergistic-doped hydrated V_(2)O_(5)·0.48H_(2)O cathode(VNACOF)to enhance the electronic and spatial effects in the bulk.A range of in-situ,ex-situ characterizations,and DFT calculations profoundly clarify the strengthened ionic/electronic conductivities,structural stability,and Zn^(2+)diffusion kinetics.As a result,the VNACOF displays a superior discharge capacity(529 mA h g^(-1)@0.1 C),rate capabilities(488 mA h g^(-1)@0.5 C,437 mA h g^(-1)@1C),and cycling stability(301 mA h g^(-1)@10 C@5000 cycles@93%)with sufficient energy density(393 W h kg^(-1)),Furthermore,the pouch-cells with high-load(60 mg)also deliver superior cyclic(2 C@178 mA h g^(-1)@1000 cycles@90%)and rate performance(132 mA h g^(-1)@5 C),revealing great application potential for high-energy-density and high-stability AZIBs.展开更多
文摘采用溶胶凝胶法制备了Sr_2Bi_5Fe Ti_5O_(21)(SBFTi)陶瓷,测试了SBFTi陶瓷室温~500℃范围内的介温谱、交流阻抗以及交流电导率,对其进行了分析。结果表明:SBFTi陶瓷的介电常数比Sr_2Bi_4Ti_5O_(18)高,频率稳定性好,具有弥散型铁电体的特征;SBFTi陶瓷的电学结构比较均匀,宏观电阻具有负温度系数特征并主要来源于晶粒的作用;在200~480℃温度范围内,SBFTi陶瓷的电导激活能为0.6 e V,氧空位为SBFTi陶瓷的主要载流子。
基金financially supported by the National Key Research and Development Program of China(2022YFA1505700,2019YFA0210403)the National Natural Science Foundation of China(52102216)+4 种基金the Natural Science Foundation of Fujian Province(2022J01625,2022-S-002)the Anhui Key Laboratory of Nanomaterials and Nanotechnology,the Major Science and Technology Projects in Anhui Province(202305a12020006)the Open Project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry(2025-22)the Innovation Training Program for College Students(cxxl-2024131,cxxl-2024136)support by Transmission Electron Microscope Platform and High-performance Computing Platform of Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China。
文摘Layered V_(2)O_(5) cathode holds the merits of high theoretical specific capacity(589 mA h g^(-1))in aqueous zinc-ion batteries(AZIBs),yet it still suffers from inferior bulk conductivity and structure degradation notably during prolonged cycling.Herein,we ingeniously design cations(Na^(+)/Co^(2+)/Al^(3+))and anion(F^(-))synergistic-doped hydrated V_(2)O_(5)·0.48H_(2)O cathode(VNACOF)to enhance the electronic and spatial effects in the bulk.A range of in-situ,ex-situ characterizations,and DFT calculations profoundly clarify the strengthened ionic/electronic conductivities,structural stability,and Zn^(2+)diffusion kinetics.As a result,the VNACOF displays a superior discharge capacity(529 mA h g^(-1)@0.1 C),rate capabilities(488 mA h g^(-1)@0.5 C,437 mA h g^(-1)@1C),and cycling stability(301 mA h g^(-1)@10 C@5000 cycles@93%)with sufficient energy density(393 W h kg^(-1)),Furthermore,the pouch-cells with high-load(60 mg)also deliver superior cyclic(2 C@178 mA h g^(-1)@1000 cycles@90%)and rate performance(132 mA h g^(-1)@5 C),revealing great application potential for high-energy-density and high-stability AZIBs.
