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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.