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Nickel catalytic graphitized porous carbon as electrode material for high performance supercapacitors

Wang, Keliang, Cao, Yuhe, Wang, Xiaomin, Kharel, Parashu Ram, Gibbons, William, Luo, Bing, Gu, Zhengrong, Fan, Qihua, Metzger, Lloyd
Energy 2016 v.101 pp. 9-15
capacitance, carbon, carbonization, electrochemistry, electrodes, energy density, nickel, physical properties, potassium hydroxide, surface area
Whey-protein-derived nitrogen-doped porous carbon has been prepared by preliminary carbonization at 400 °C and final KOH activation at 700 °C combined with catalytic graphitization. Physical characterization indicated that the nitrogen-doped activated electrode material had a large specific surface area (2536 m² g⁻¹) and plenty of interconnected cavities, which greatly improved the performance of supercapacitors. Electrochemical measurements demonstrated that the as-prepared activated electrode material had exceptionally high capacitance of 248 F g⁻¹ at charge/discharge current density of 0.1 A g⁻¹. Moreover, the prepared supercapacitors exhibited ideal capacitive behavior with nearly no capacitance loss in 6 mol L⁻¹ KOH at different charge/discharge current densities ranging from 0.1 to 5 A g⁻¹ after 1000 charge/discharge cycles. The derived energy density was 12.4 Wh kg⁻¹ at a power density of 495 W kg⁻¹ under operational conditions. These results suggested that the whey-protein-derived porous carbon is a promising supercapacitor electrode material.