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【答案】应助回帖
★ ★ ★ ★ ★ 感谢参与,应助指数 +1 zlin: ECEPI+1, 鼓励交流~ 2012-10-12 16:07:57 cheng8919: 金币+5 2012-10-13 09:42:30
Differential pulse voltammetry-DPV
DPV is often used to make electrochemical measurements. It can be considered as a derivative of linear sweep voltammetry or staircase voltammetry, with a series of regular voltage pulses superimposed on the potential linear sweep or stair steps. The current is measured immediately before each potential change, and the current difference is plotted as a function of potential. By sampling the current just before the potential is changed, the effect of the charging current can be decreased.
中文描述
差示脉冲伏安法(DPV)在线性电势或者阶梯电势上再加上一个重复的固定脉冲电压之和作为激励信号,在脉冲之前和脉冲后期(见下图)进行取样,用脉冲后期的电流减去脉冲之前的电流(i=i后-i前),用差减所得的电流对电压作图。所得的伏安图中,峰的高度与相应的电活性物质的浓度成正比。公式有点复杂。在回帖中输入很麻烦,略去~~
该方法相比于CV,优势是更加灵敏。
参见胡会利的《电化学测量》第五章 5.5 节 PP203
及其他电化学方法的著作都会有介绍的
希望小兵的回帖对你有所帮助~
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Potential wave form for differential pulse voltammetry.
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DPV
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