碱性锌锰电池封口新结构

本文作者研制了一种碱性锌锰电池的封口结构。经过电池的生产和长时间的贮存试验证实此种封口结构可以有效地防止电池泄漏。     

金属锰电解能耗分析及节能措施

研究分析了影响金属锰电解过程电能消耗的槽电压和电流效率这两个主要因素，并结合生产实际总结出了八项可行的节能具体措施．     

锰硅合金生产中入炉锰矿的优化搭配

通过对以往配矿思路的缺陷分析,引入炉料含锰的概念和与配方思路,相应补充和推导部分配矿参数,浅谈了这些参数的应用方法及步骤,以达到合理与矿和优化配化的目的及效果。     

菱锰矿浸取及除杂工艺的研究进展

综述了目前国内外菱锰矿的浸取方法及除杂工艺的研究进展,重点评述了预焙烧浸取法、直接酸浸取法、还原浸取法等浸取工艺及铁、铝、镁、钙、重金属等杂质的净化方法,并对我国锰资源的合理开发利用提出了一些建议。     

A selective modified bentonite–porphyrin carbon paste electrode for determination of Mn(II) by using anodic stripping voltammetry

A novel voltammetric sensor based on chemically modified bentonite–porphyrin carbon paste electrode (MBPCE) has been introduced for the determination of trace amount of Mn(II) in wheat flour, wheat rice and vegetables. In this method Mn(II) gives well-defined voltammetric peak at the pH range of 3.5–7.5. For the preliminary screening purpose, the catalyst was prepared by modification of bentonite with porphyrin and characterized by thermogravimetric method (TG) and UV–vis spectroscopy. The detection limit (three times signal-to-noise) with 4 min accumulation is 1.07 × 10⁻⁷ mol L⁻¹ Mn(II). The peak currents increases linearly with Mn(II) concentration over the range of 6.0 × 10⁻⁷ to 5.0 × 10⁻⁴ mol L⁻¹ (r² = 0.9959). Statistical treatment of the results gave a relative standard deviation lower than 2.30%. The chemical and instrumental parameters have been optimized and the results showed that 1000-fold excess of the additive ions had not interferences on the determination of Mn(II).     

Cycle stability of birnessite manganese dioxide for electrochemical capacitors

A combination of step potential electrochemical spectroscopy (SPECS) and electrochemical impedance spectroscopy (EIS) has been used to examine the electrochemical cycling behaviour of a well-characterized birnessite-phase manganese dioxide sample for use in electrochemical capacitors. The resistance and interfacial properties of the macroscopic electrode were found to be irreversible with cycling. However, the corresponding properties for the individual particles were more reversible, although they did show substantial hysteresis in their behaviour during cycling. This behaviour was discussed in terms of the structural, conductivity and morphological characteristics of the birnessite at different depths of discharge.     

pH sensing in aqueous solutions using a MnO2 thin film electrodeposited on a glassy carbon electrode

An electrolysis technique at a constant potential was used to develop a highly reproducible and fast elaboration method of adherent manganese dioxide thin films on a glassy carbon electrode from aqueous solutions containing sulfuric acid and manganese sulfate. The resulting films were found to have a nanostructured character presumably due rather to birnessite (δ-MnO₂) than to γ-MnO₂, as suggested by their Raman and XRD signatures. They lead to modified electrodes that present an obvious although complex pH dependent potentiometric response. This sensor indeed showed a single slope non-Nernstian linear behaviour over the 1.5–12 pH range for increasing pH direction (“trace”), whereas a Nernstian two slopes linear behaviour was observed for decreasing pH direction (“re-trace”). Preliminary EIS experiments carried out at a pH value of 1.8 seem to reveal a sensitivity mechanism based on proton insertion process at least at highly acidic pH values.     

掺铋二氧化锰纳米粉体的循环伏安行为

通过对掺铋二氧化锰纳米粉体的循环伏安行为的研究,讨论了掺杂Ｂｉ－ＭｎＯ２纳米电极的充放电机理。Ｂｉ（Ⅲ）的掺入完全改变了ＭｎＯ２电极的放电机理,但掺杂Ｂｉ－ＭｎＯ２纳米电极与常粒Ｂｉ－ＭｎＯ２电极的放电机理是类似的。在充放电的过程中,均形成一系列不同价态的Ｂｉ－Ｍｎ复合物,通过这些复合物的共还原和共氧化,有效地抑制电化学惰性物质Ｍｎ３Ｏ４的生成,从而极大地改善了电极的可充性能。ＭｎＯ２氧化度高的电极,其活性也大,但在充放电过程中形成Ｂｉ－Ｍｎ复合物之后,差别逐渐缩小,复合物的氧化还原过程与初始氧化态关系不大     

中国化学电源50年(1)——锌/二氧化锰电池

初步小结了新中国成立后,Zn/MnO2电池50年来的研究和进展.主要包括近20年来在理论研究、MnO2的物理和化学性质与其电化学活性相关的MnO3的制备和改性、干电池、碱锰电池和可充碱锰电池的研究,以及锌电极的汞齐化、降汞和去汞等方面的成就.     

粗品硫酸锰的分离提纯

采用直接加热法对某化工厂对苯二酚生产过程中得到的硫酸锰副产品进行了分离纯化的实验室研究,以分离后产品中的二价锰含量作为标准评价纯化效果,研究表明将样品在电炉上加热至无白烟后于马沸炉中恒温,温度在520~620℃时均能达到很好的纯化效果。