Electrochemical modification and its effect on the pseudocapacitive properties of a graphite electrode

A graphite electrode (GE) was modified in a 2. 3 mol/ L H₂SO₄ solution using GE as a working electrode, Pt as a counter electrode andsaturatedcalomelelectrode (SCE) as a reference electrodeby a galvanic method under a constant current. Results showed thatafter the GE was optimally modified at a current of 200 mA for 300 s and -120 mA for 100 s for 6 cycles, it had a porous, rough and three-dimensional active layer with a pseudo capacitance of 2. 08 F/ cm ² . The modified GE had a much lower resistance and higher sweep rate than the unmodified one