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词汇 Standard potential
分类 英语词汇 英语翻译词典
释义

Standard potential

原声例句
Crash Course 综合篇

For this reason the value is known as the standard reduction potential of a substance.

因此,该值被称为物质的标准还原电位。

化学 Crash Course

And the electrical potential for the whole reaction, called the standard cell potential, is just the sum of the standard potentials of both half reactions.

整个反应的电势称为标准电池电势,只是两个半反应的标准电势之和。

中文百科

标准电极电势 Standard electrode potential

(重定向自Standard potential)

标准电极电势是可逆电极在标准状态及平衡态时的电势,也就是标准态时的电极电势,记作E^oE^0E^{\ominus},上标\ominus表示标准态。标准状态意味着:溶质的有效浓度为1mol/L,气体压强为100 kPa,温度一般为298K。

虽然电池的电动势可以直接测定,但单一可逆电极的标准电极电势却只有相对值没有绝对值,而且它随着温度、浓度和压强而发生变化。电极电势的基准是标准氢电极:标准状态下H/H2电极的电势被定为0.00V,即\phi^{\ominus} (H^+/H_2)=0.00V\,,其他电极电势的值在此基础上获得。当某半电池和标准氢电池电极相连时为负极,该半电池的半反应的标准电极电势为负值,且绝对值与电池电动势相等;若为正极则相反。这样求得的值称作还原电势,总反应的标准电极电势也就是两个半反应标准电极电势的差,E大于零时反应自发。

英语百科

Standard electrode potential 标准电极电势

(重定向自Standard potential)

In electrochemistry, the standard electrode potential, abbreviated E° or E (with a superscript plimsoll character, pronounced "standard" or "nought"), is the measure of individual potential of a reversible electrode at standard state, which is with solutes at an effective concentration of 1 mol dm, and gases at a pressure of 1 atm. The reduction potential is an intensive property. The values are most often tabulated at 25 °C. The basis for an electrochemical cell such as the galvanic cell is always a redox reaction which can be broken down into two half-reactions: oxidation at anode (loss of electron) and reduction at cathode (gain of electron). Electricity is generated due to electric potential difference between two electrodes. This potential difference is created as a result of the difference between individual potentials of the two metal electrodes with respect to the electrolyte. (Reversible electrode is an electrode that owes its potential to changes of a reversible nature, in contrast to electrodes used in electroplating and destroyed during their use)

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