Ternary metal sulfides MoCoNiS derived from metal organic frameworks for efficient oxygen evolution

Developing a highly active and low-cost non-precious metal electrocatalyst for oxygen evolution has been urgent for the clean energy system. Herein, the ternary metal sulfides MoCoNiS supported on nickel foam (MoCoNiS/NF) are successfully prepared using Mo doping Co-based metal-organic framework (Co-MOF) as precursor, which may be helpful for the good dispersion of different metal element. The uniform elements distribution of Mo, Co and Ni on MoCoNiS/NF is determined by all kinds of physical characterization. Mo doping may regulate the electronic environment around Co and Ni, suggesting the potential synergistic effects between different heteroatoms. Electrochemical test shows that MoCoNiS/NF exhibits the excellent OER activity than other single metal or binary metal sulfides as comparison samples, needing only 151 and 226 mV overpotential to achieve current density of 10 (η₁₀ = 151 mV) and 100 mA cm⁻² (η₁₀₀ = 226 mV), respectively. The excellent stability of MoCoNiS/NF has been achieved. The remarkable OER performance of MoCoNiS/NF may due to the synergistic effects and good electrical conductivity as well as the three-dimensional structure of NF as substrate. Therefore, the rational design of MOF derived multi transition metal-based electrocatalysts will be an effective way for increasing OER performance.     

Electrochemical determination of sulfite and phenol using a carbon paste electrode modified with ionic liquids and graphene nanosheets: Application to determination of sulfite and phenol in real samples

Benzoylferrocene was used to construct a modified-graphene paste electrode. Also, hydrophilic ionic liquid (n-hexyl-3-methylimidazolium hexafluoro phosphate) was used as a binder to prepare the modified electrode. The electro-oxidation of sulfite at the surface of the modified electrode was studied using electrochemical approaches. This modified electrode offers a considerable improvement in voltammetric sensitivity toward sulfite, compared to the bare electrode. Square wave voltammetry (SWV) exhibits a linear dynamic range from 5.0 × 10⁻⁸ to 2.5 × 10⁻⁴ M and a detection limit of 20.0 nM for sulfite. The diffusion coefficient and kinetic parameters (such as electron transfer coefficient and the heterogeneous rate constant) for sulfite oxidation were also determined. The prepared modified electrode exhibits a very good resolution between the voltammetric peaks of sulfite and phenol that makes it suitable for the detection of sulfite in the presence of phenol in real samples.     

基于Unix系统的煤质管理信息系统设计与开发

分析煤质分析信息管理流程,阐述在Unix环境下开发煤质管理信息系统的开发模式、流程设计、数据库设计、系统安全维护及系统主要的功能特点,系统的开发提高了煤质管理工作效率,完善管理机制,增强竞争力,增加经济效益和实现了无纸化办公。     

碳纳米球储氢材料的制备及影响因素研究

无烟煤经过脱灰、炭化和预石墨化处理,然后添加活性金属,用充氢反应球磨法制得碳纳米球储氢材料.研究了原料预处理、充氢压强、活性金属等对材料储氢性能的影响.高能反应球磨时,物料在较短时间内即可达到30～50 nm,并具有较高的储氢密度和较低的放氢温度.镁和碳在储氢过程中存在协同效应,Al,Co,Fe,Ni金属催化剂能显著改善储氢材料的吸放氢性能,并对镁碳协同储氢有促进作用.     

氧化铝空心球的制备及隔热性能的研究

采用水热法制备了胶体碳球,以碳球为模板,加入氨水或尿素作为沉淀剂制备了氧化铝空心球,将氧化铝空心球用于隔热涂层的制备,并对所制备的氧化铝空心球的微观形貌和涂层的隔热性能进行了表征与测试。结果表明,以尿素为沉淀剂时制备的氧化铝空心球形状规则、壁厚均匀,将制得的氧化铝空心球用在涂层的制备中能起到良好的隔热效果,且当涂层中空心球含量为5%时较经济实用。     

Effect of the concentration of the sizing agent on the carbon fibers surface and interface properties of its composites

The effect of the concentration of the sizing agent on performances of carbon fiber and carbon fiber composites has been investigated. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were applied to characterize carbon fiber surface topographies. At the same time, the single fiber strengths and Weibull distribution were also studied. The interlaminar shear strength and hygrothermal ageing test have been used to study the effect of fiber coatings on the interface of the composites. The analysis of the results shows that the sizing level is essential for improving the surface of carbon fibers and its composite performance. Different concentrations of the sizing agent have different contributions to the wetting performance of carbon fibers. Among the three concentrations of sizing agent studied (1 wt %, 1.5 wt %, and 2 wt %), the optimal sizing level is 1.5 wt %. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci 125:425–432, 2011     

纳米TiO2光催化复合膜的制备及其对直接湖蓝催化降解性能

采用水解与均匀沉淀法相结合,制备了锐钛型纳米TiO₂粉末。以壳聚糖、β-环状糊精和十二烷基磺酸钠改性的纳米TiO₂为成膜材料,流延法制得分散较均匀的纳米复合膜,采用X射线衍射表征其结构,测试壳聚糖膜的机械性能,研究复合膜的制备工艺及对直接湖蓝的催化性能。结果表明,随着β-环糊精加入量的增加,复合膜的力学性能降低。复合膜中壳聚糖质量分数80.0%、β-环糊精质量分数16.0%和TiO₂质量分数4.0%时,对直接湖蓝的催化降解效果最好。     

Research on Distribution Pattern of Heavy Metals in Yanzhou Coalfield

Heavy metal pollution brings extensive concerns since 1940s. In order to assess the heavy metal pollution on the farmland of Yanzhou coalfield, 216 soil samples and 54 combined samples were collected. Lead, cadmium, chromium, copper, zinc, and nickel contained in both topsoil and deep soil were analyzed using atomic absorbent spectrometry analyzer （AAS）. Fuzzy clustering method was used in data processing. And fuzzy synthetic assessment was applied to assess the soil contamination by heavy metals. The result shows that Yanzhou coalfield has been polluted by the heavy metals to some extent.     

反应性乳化剂存在下无皂纳米TiO_2苯丙复合乳液的合成及表征

在反应性乳化剂SE-10N存在下,采用预乳化半连续种子乳液聚合工艺合成了无皂纳米TiO2/苯丙复合乳液,通过正交实验优化了合成工艺条件,并对复合乳液的性能进行了测试。结果表明,所制得的复合乳液稳定,其涂膜耐水性和硬度均优于同组成的有皂复合乳液,涂膜铅笔硬度可达到2H级,且纳米TiO2的加入提高了无皂苯丙乳液涂膜的耐热性。对复合乳液进行透射电镜和动态光散射分析,结果表明无皂复合乳液乳胶粒的平均粒径为80 nm,且具有以纳米TiO2为核、聚合物为壳的异常型核/壳结构。