期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
An Unusually High Sensitivity of Pt-black pH Electrode
1
作者 孙咏红 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第2期197-199,共3页
The potentials of Pt-black electrode using a copper conducting wire instead of the salt bridge in acid and alkaline solutions without the use of H2 evolution reactions were measured. There were three nonlinear portion... The potentials of Pt-black electrode using a copper conducting wire instead of the salt bridge in acid and alkaline solutions without the use of H2 evolution reactions were measured. There were three nonlinear portions in the calibration curve. Unusually, the potential slopes at pH 3-5 and 8-10 indicated 200 mV and 70 mV per pH, respectively. Such high sensitivity for pH slope, more than 4 times of usual 59 mV per pH, may be credited to the special properties of the Pt-black surface. SEM (scanning electronical microscopy) was applied to characterize the surface of the Pt-black electrode. Its working mechanism is well explained in the theory of capacitance potentials rather than Nernst's redox potentials. 展开更多
关键词 Pt-black pH electrode sensitivity capacitance potential
下载PDF
Modeling and Simulations in Symmetrical Supercapacitors Using Time Domain Mathematical Expressions
2
作者 Antonio Paulo Rodrigues Fernandez Elio Alberto Périgo Rubens Nunes de Faria Júnior 《Journal of Applied Mathematics and Physics》 2022年第10期3083-3100,共18页
This study presents the deduction of time domain mathematical equations to simulate the curve of the charging process of a symmetrical electrochemical supercapacitor with activated carbon electrodes fed by a source of... This study presents the deduction of time domain mathematical equations to simulate the curve of the charging process of a symmetrical electrochemical supercapacitor with activated carbon electrodes fed by a source of constant electric potential in time ε and the curve of the discharge process through two fixed resistors. The first resistor R<sub>Co</sub> is a control that aims to prevent sudden variations in the intensity of the electric current i<sub>1</sub>(t) present at the terminals of the electrochemical supercapacitor at the beginning of the charging process. The second resistor is the internal resistance R<sub>A</sub> of the ammeter used in the calculation of the intensity of the electric current i<sub>1</sub>(t) over time in the charging and discharging processes. The mathematical equations generated were based on a 2R(C + kU<sub>C</sub>(t)) electrical circuit model and allowed to simulate the effects of the potential-dependent capacitance (kU<sub>C</sub>(t)) on the charge and discharge curves and hence on the calculated values of the fixed capacitance C, the equivalent series resistance (ESR), the equivalent parallel resistance (EPR) and the electrical potential dependent capacitance index k. 展开更多
关键词 Symmetrical Supercapacitors Electrical Circuit Modeling potential Dependent capacitance Simulation of Charge and Discharge Curves Time Domain Mathematical Equations
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部