the reaction to happen. Double potential step chronoamperometry Double potential step chronoamperometry (DPSCA) is the technique whose working electrode is applied by the potential stepping forward for a certain period of time and backward for a period of time. The current is monitored and plotted with respect to time. This method starts with an induction period. In this period, several initial conditions will be applied to the electrochemical cell so that cell is able to equilibrate to those conditions. The working electrode potential will be held at the initial potential under these conditions for a specified period (i.e. usually 3 seconds). When the induction period is over, the working cells switch to another potential for a certain amount of time. After the first step is completed, the working electrode's potential will stepped back, usually to the potential prior to the forward step. The whole experiment ends with a relaxation period. Under this period, the default condition involves holding the working electrode potential of initial state for another approximate 1 seconds. When the relaxation period is over, the post experiment idle conditions will be applied to the cell so that the instrument can return to the idle state1. After plotting the current as a function of time, a chronoamperogram will occur and it can also be used to generate Cottrell plots. Two methods from chronoanalysis Chronopotentiometry The application of chronopotentiometry could be derived into two parts. As an analytical method, the range of analysis is normally in the range of 10−4 mol/L to 10−2 mol/L, and sometimes it will be as accurate as 10−5 mol/L. When the analysis is in the extreme lower range of concentration, lower current density could be used. Also, to get the accurate concentration determination, the transition time could be extended. In this area of analysis determination, chronopotentiometry is similar to polarography. Waves that are separable in polarography is also separable in chronopotentiometry. Chronopotentiometry is an effective method to study electrode mechanism. Different electrode will have different relationship between E and t in the chronopotentiometry graph. In this situation, E is the electrode potential in voltage and t is the reaction time in seconds. By the method of studying the relationship between E and t in the chronopotentiometry graph, we can get the information of mechanisms of electrode reactions, such as the electrode reaction of hydrogen peroxide and oxalic acid. The chronopotentiometry experiment could be done in