磁性聚苯胺纳米纤维吸附性能的探究

以有机酸、粉煤灰磁珠为掺杂剂,过硫酸铵为氧化剂,采用氧化聚合的方法合成了磁性聚苯胺纳米纤维,对合成的磁性聚苯胺进行扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、紫外-可见光分光光度计(UV)、振动磁强计(VSM)、X-射线衍射仪(XRD)等表征,揭示了其形貌、结构、成分和磁性能,并使用磁性聚苯胺作吸附剂...     

Discharge characteristics of an Li/LiCoO2 cell with poly(acrylonitirile)-based polymer electrolyte

The electrochemical properties of poly(acrylonitrile) (PAN)-based polymer electrolyte and the discharge characteristics of an Li/LiCoO₂ cell were investigated. The PAN-based polymer electrolyte maintained an ionic conductivity of 1 mS/cm at room temperature, irrespective of storage time. Also, this electrolyte showed high electrochemical stability up to 4.3 V (versus Li⁺/Li). An Li/LiCoO₂ cell battery with this electrolyte has been fabricated and tested. This battery showed good cycling performance.     

TIG焊Al3Zr/A356复合材料的显微组织特征和耐腐蚀性能

通过原位反应法制备了增强相含量为3%(质量分数，下同)的Al₃Zr/A356铝基复合材料(AMCs)。通过X射线衍射仪、扫描电子显微镜、能谱仪和显微硬度测试，研究了不同钨极氩弧(TIG)焊焊接参数下焊接接头的显微组织和耐腐蚀性能。结果表明，当焊接电流为140 A时，焊缝成形最好，没有气孔或裂纹等焊接缺陷。焊接过程中生成细小的Al₃Ti增强颗粒，呈球形和短棒状，并分散在基体中。焊接接头的硬度高于基体金属的硬度，增强颗粒的强化效果明显。随着在3.5%NaCl溶液中的浸泡时间延长，焊缝的点蚀程度增加，且大多发生在晶界和强化相周围。微区电化学实验结果表明，当焊接电流为140 A时，腐蚀电位波动小，腐蚀倾向低，耐腐蚀性能最好。     

Constructing highly active interface between layered Ni(OH)2 and porous Mo2N for efficient electrocatalytic oxygen evolution reaction

Layered Ni(OH)₂ materials are cheap and efficient electrocatalyst for water splitting. However, pristine Ni(OH)₂ materials usually show poor activity due to the low activity sites and poor conductivity in electrochemical reactions. Herein, layered Ni(OH)₂ nanosheets are grown on the porous Mo₂N particles for improved interfacial active sites and enhanced conductivity in the oxygen evolution reaction (OER). The OER overpotential of the optimized Mo₂N/Ni(OH)₂ composite material is distinctly reduced compared with pristine Ni(OH)₂. In addition, the optimized Mo₂N/Ni(OH)₂ composite material exhibits favorable durability in alkaline electrolyte. Further electrochemical investigation reveals that the Mo₂N/Ni(OH)₂ composite materials produce increased charge transfer capability and electrochemical active surface area. Theoretical calculation study demonstrates that a redistribution of electron occurred at the interface of Ni(OH)₂ and Mo₂N, which results in the decrease of energy barrier for the adsorption of OER reactive intermediates at the interfacial atoms. The enhanced performance of OER is thus mainly come from the constructed interface between layered Ni(OH)₂ and porous Mo₂N. This work gives a feasible method to develop cheap and efficient electrocatalysts for water splitting.