平面交叉指状电极间电场分布

研究了具有金属－半导体－金属结构的探测器内部电场与其几何尺寸的关系，并求出使探测器内部电场的均匀性，稳定性达到最佳的几何条件。     

不同茶叶中氟含量及溶出特性的对比

测定不同茶叶中氟含量,对茶叶溶出特性及影响因素进行分析。采用氧弹——燃烧技术和离子选择性电极测定茶叶中的氟含量。不同茶叶中的氟含量有一定的差异,氟含量为砖茶>红茶>绿茶,溶出率也不相同。不同介质及时间对茶叶的溶出率有一定的影响,但氟含量未出现超出限定值的现象。     

熔化极焊机全自动改进在焊接H钢中的应用

介绍了对熔化极焊机全自动改进的方法、操作。此法有效地保证了H钢的焊接质量,提高了焊接速度。     

电极结构对辉光放电着火电压的影响

用于微波传感的辉光管存在着火电压高的问题.本文研究了针形电极在几种电极结构下的辉光放电着火电压,电极结构分别为2针、3针和4针.在本实验的氩气压0.5～2.5 kPa范围内,几种电极结构下着火电压有明显的不同,在0.5kPa气压下着火电压差值最大(208 V).进行了电场计算,根据计算结果简要分析了着火电压变化行为.本...     

Modeling of an anode-supported Ni-YSZ|Ni-ScSZ|ScSZ| LSM-ScSZ multiple layers SOFC cell: Part II. Simulations and discussion

In part I of the present study, a two-dimensional isothermal mechanistic model of a composite yttria/scandia stabilized zirconia anode-supported multiple layers solid oxide fuel cell (Ni-YSZ|Ni-ScSZ|ScSZ|LSM-ScSZ) was developed, calibrated and validated using a button cell setup. In this paper, the model was further validated for extended operating conditions of fuel and oxidant compositions, which confirmed the robustness of the model. Since an important attribute of this model is its ability to accurately describe the effect of cell microstructure on cell performance, a large section of part II is devoted to sensitivity analysis of various microstructure parameters (cathode area, porosity, layer thickness and particle radius) on cell performance. In particular, the simulation results have shown how the button cell microstructure should be modified to optimize its performance. The proposed model could be used as a bridge between micro-scale electrode models and macro-scale unit cell simulation, thus being a useful tool for electrode design.     

Electrochemical applications of net-benefit analysis via Bayesian probabilities

By means of three specific applications to electrochemical science, this paper demonstrates the usefulness of the net-benefit principle and Bayesian (posterior) probabilities in deciding whether equipment in an electrochemical laboratory or plant should be repaired or replaced.     

In-situ measurement of ethanol tolerance in an operating fuel cell

Ethanol is seen as an attractive option as a fuel for direct ethanol fuel cells and as a source for on-demand production of hydrogen in portable applications. While the effect of ethanol on in-situ electrode behavior has been studied previously, these efforts have mostly been limited to qualitative analysis. In alkaline fuel cells, several cathode catalysts, including Pt, Cu triazole, and Ag can be used. Here, we apply a methodology using a microfluidic fuel cell to analyze in-situ the performance of these cathodes as well as Pt anodes in the presence of ethanol and acetic acid, a common side product from ethanol oxidation. For a given concentration of ethanol (or acetic acid), the best cathode catalyst can be determined and the kinetic losses due to the presence of ethanol (or acetic acid) can be quantified. These experiments also yield information about power density losses from the presence of contaminants such as ethanol or acetic acid in an alkaline fuel cell. The methodology demonstrated in these experiments will enable in-situ screening of new cathodes with respect to contaminant tolerance and determining optimal operational conditions for alkaline ethanol fuel cells.     

ELECTROKINETIC EFFECTS: CARBONIC ANHYDRASE AND CO2 ELECTRODE DYNAMICS

It is well known that the dynamic response rate of the Severinghaus-type CO₂ electrode is improved significantly in some cases by addition of the enzyme carbonic anhydrase to the electrode assembly. Hysteresis in the response rate also is reduced. Experimental data and modelling results indicate that catalysis of the CO₂ hydration reaction in the bulk of the bicarbonate layer (the Nernst film) is not responsible for the improved response behavior, Evidence is presented to show that catalysis in the electrostatic double layer region at the glass electrode surface is a possible explanation. This proposed phenomenon may have widespread implications for the optimal design of analytical devices, commercial processes involving electrochemical phenomena, and may also provide insight into electrobiologi-cal processes.