Synthesis of Co-Ni oxide microflowers as a superior anode for hybrid supercapacitors with ultralong cycle life

Li-ion hybrid capacitors (LIHCs), composing of a lithium-ion battery (LIB) type anode and a supercapacitor (SC) type cathode, gained worldwide popularity due to harmonious integrating the virtues of high energy density of LIBs with high power density of SCs. Herein, nanoflakes composed microflower-like Co-Ni oxide (CoNiO) was successfully synthesized by a simple co-precipitation method. The atomic ratio of as-synthesized CoNiO is determined to be 1:3 through XRD and XPS analytical method. As a typical battery-type material, CoNiO and capacitor-type activated polyanilinederived carbon (APDC) were used to assemble LIHCs as the anode and cathode materials, respectively. As a result, when an optimized mass ratio of CoNiO and APDC was 1:2, CoNiO//APDC LIHC could deliver a maximum energy density of 143 Wh kg^-1 at a working voltage of 1-4 V. It is worth mentioning that the LIHC also exhibits excellent cycle stability with the capacitance retention of 78.2% after 15,000 cycles at a current density of 0.5 A g^-1.     

锰锌铁氧体纳米粒子制备与热磁性研究

采用化学共沉淀法制备锰锌铁氧体磁性颗粒并进行了表征,用X射线荧光光谱仪（XRF）、X射线衍射（XRD）测试分析了颗粒组成、结构、平均粒径,表明制备的样品为锰锌铁氧体纳米粒子,平均粒径约为17nm.用振动样品磁强计（VSM）测量了颗粒的磁滞回线和热磁特性.     

氢氧化铁共沉淀-氢化物发生-原子荧光光谱法测定卤水中痕量硒

氢氧化铁共沉淀分离卤水中痕量硒,用盐酸溶解沉淀并酸化,盐酸水浴加热还原六价硒为四价硒,氢化物发生-原子荧光光谱法测定硒.检出限( 3S/N)为=0.076μg·mL-1,加标回收率为90.0％-100.0％,相对标准偏差(n=11)为1.25％.     

共沉淀法制备的CeO2-ZrO2-Al2O3材料及性能

采用简单易操作的共沉淀法制备了性能优异的CZA材料, 并通过对其晶体结构的表征, 初步探讨了ZrO2和Al2O3在CZA中的存在方式.     

共沉淀-感耦等离子体质谱法测定地质样品中的超痕量金铂钯

本工作研究提出了共沉淀富集结合ICP-MS测定地质样品中的金、铂、钯的方法,研究了仪器的最佳化和内标元素的选择。在本工作的实验条件下获得的方法测定下限以6倍标准偏差计分别为Au:0.23 ng·g-1,Pt:0.19 ng·g-1,Pd:0.16 ng·g-1;方法精密度(RSD)Au:1.4％-18.2％,Pt:0.2％-16.4％,Pd:0.4％-13.6％。采用本工作制定的分析方法,测定了国家一级地球化学标准物质中的痕量Au,Pt,Pd,测定值与标准值相吻合。     

硫酸钴中痕量铅及铅的原子吸收光谱测定

提出了用磷酸钇(YPO4)作为共沉淀捕集剂分离富集硫酸钴溶液中的痕量铅，用火焰原子吸收光谱测定铅的方法。共沉淀受pH、YCl3和H3P4溶液用量的影响。结果表明，在pH为3．0～4．0时，YPO4能够定量共沉淀硫酸钴溶液中的铅。铅的加标回收率为96．4％，排除了基体干扰，取得了较为满意的结果。     

La0.67Sr0.33FexMn1-xO3制备和奇特磁电阻效应

The Ln0.67Sr0.33Fe.Mn1-xO3(LSFMO)(0.05< x <0.33) systems have been synthesized by co-precipitation. The X-ray diffraction patterns indicates that these compounds are of single phase with rhombohedral structure. The resistivity of samples was measured in zero field and applied field (H=4000Oe) by a standard four-probe method. Large magnetoresistance (MR) was found in all samples. There is a resistivity transition peak in LSFMO (x ≦0.13) in which MR negative, the temperature (TP) at which the resistivity peak occurs decreases with the increasing of x. LSFMO (x=0.23) to which the large negative MR is still found is a semiconductor, It is unexpected that a peculiar alternative positive negative MR was found in LSFMO(x=0.33) which also is a semicondutor.     

阴极材料LaFe0.8-xCuxNi0.2O3的合成和烧结性能

LaFe_0.8-xCu_xNi_0.2O₃ (x=0.0~0.2) (LFCN), a new cathode material of solid oxide fuel cell (SOFC), was synthesized by Co-precipitation method using sodium bicarbonate. The lattice structures of samples with different x contents were characterized by XRD. Porosity and density of the porous LaFe_0.8-xCu_xNi_0.2O₃ (x=0.0~0.1) as a function of sintering temperature were investigated. It was found that the orthorhombic structure could be formed after calcination at 900 ℃ for 4 h. The particle size of LFCN was about 350 nm. The density of the porous LFCN increased with sintering temperature, but the opposite was true for the porosity. On the other hand, at the same sintering temperature, the porosity of LaFe_0.8-xCu_xNi_0.2O₃ (x=0.0~0.1) decreased with increasing x contents. It is indicated that the dopant of Cu on LaFe_0.8Ni_0.2O₃ can facilitate the sintering of the materials. After sintering at 1 100 ℃ for 4 h, the porous LaFe_0.7Cu_0.1Ni_0.2O₃ was still with appropriate structure, and its porosity was 29%.     

Co-precipitative pre-concentration with sodium diethyldithiocarbamate and ICP-AES determination of Se, Cu, Pb, Zn, Fe, Co, Ni, Mn, Cr and Cd in water

Sodium diethyldithiocarbamate in the presence of a weak oxidizing agent is used as a co-precipitative agent for the pre-concentration of Se, Cu, Pb, Zn, Fe, Co, Ni, Mn, Cr and Cd. A procedure was developed for ICP-AES determination of these elements after pre-concentration in river and waste water (an enrichment factor of 40). The recovery of all the elements tested for was more than 98%. The limits of determination (mg l⁻¹) (10 S.D. blank) are 0.001 (Cu, Co, Cr, Mn), 0.0007 (Zn, Cd), 0.003 (Se), 0.004 (Fe), 0.007 (Ni), and 0.01 (Pb).     

Cr-MnOx/堇青石催化剂制备及催化降解邻二氯苯性能研究

采用溶胶凝胶法、浸渍法、共沉淀法以及流变相法制备了新型 Cr-MnOx/堇青石催化剂,同时采用X射线衍射(XRD)、扫描电镜(SEM)、热重和差热分析(TG-DTA)、H2-程序升温还原(H2-TPR)以及元素能谱(EDS)技术对催化剂进行表征。经筛选发现,以共沉淀法制备的 Cr-MnOx/堇青石催化剂(Cr/Mn=2∶5)催化活性最高。通过表征结果可知,以共沉淀方法制备的催化剂主要活性成分为 Mn2 O3和 Cr2 O3,并且具有特殊的球形和较好的氧化还原性能,协同作用的存在有助于催化降解目标污染物邻二氯苯(o-DCB)性能的提高;在60 h之内,o-DCB降解率仍保持在80%以上,具有较好的催化稳定性。