钴
超级电容器
生物量(生态学)
氮气
碳纤维
氧还原
还原(数学)
化学工程
电化学
无机化学
电极
电容
化学
法拉第效率
氧还原反应
催化作用
碳化
活性炭
氧气
功率密度
材料科学
有机化学
生态学
工程类
数学
生物
物理化学
复合材料
几何学
复合数
作者
Man Zhang,Xin Jin,Linan Wang,Meng‐Jia Sun,Yang Tang,Yongmei Chen,Yanzhi Sun,Pingyu Wan
标识
DOI:10.1016/j.apsusc.2017.03.097
摘要
Abstract Biomass-derived carbon by activation with nitrogen and cobalt (denoted as NPACCo) was prepared by one-pot pyrolysis of pomelo peel with melamine, cobalt nitrate and potassium hydroxide, followed by acid leaching. NPACCo possesses high content of quaternary-N (2.5%) and pyridinic-N (1.7%), co-existences of amorphous and short-range ordered carbon, high specific surface area and pore structure with majority of micropores and small mesopores. As electrode material of supercapacitors, NPACCo exhibits high specific capacitance and good rate capability. At ultrahigh rate of 50 A g−1 (135 mA cm−2), the capacitance of NPACCo remains 246 F g−1, which is 6.3, 1.9 and 3.2 times as high as that of other three materials (PC, PAC and NPAC). The as-assembled symmetric supercapacitor of NPACCo delivers high energy density, high power density and excellent cycling stability. With respect to oxygen reduction reaction (ORR), NPACCo exhibits high onset potential (0.87 V), high half-wave potential (0.78 V), excellent methanol tolerance and low yield of H2O2. The ORR properties of NPACCo are comparable or superior to those of commercial Pt/C. This investigation of pomelo peel-based NPACCo would be valuable for development of both supercapacitor and ORR.
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