Some extra studies were carried out to control the adsorption phenomena according to the literature [29,32]. As a result, it was found that the value of the ratio of cathodic peak current to concentration (Ip,c/C) decreases with increasing concentration and the value of the ratio of cathodic peak current to multiplication of concentration and square root of scan rate (Ip,c/C uกำลัง1/2) increases with increasing scan rate.