Nitrogen-doped hierarchical porous carbon with high surface area derived from graphene oxide/pitch oxide composite for supercapacitors

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• 作者：Yuan Ma ; Chang Ma ; ^{fdoy_lt54@163.com" class="auth_mail" title="E-mail the corresponding author} ; Jie Sheng ; Haixia Zhang ; Ranran Wang ; Zhenyu Xie ; Jingli Shi ; ^{shijingli1963@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nitrogen-doped ; Hierarchical pore ; Graphene oxide ; Pitch oxide ; Supercapacitors
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：461
• 期：Complete
• 页码：96-103
• 全文大小：2281 K

文摘

A nitrogen-doped hierarchical porous carbon has been prepared through one-step KOH activation of pitch oxide/graphene oxide composite. At a low weight ratio of KOH/composite (1:1), the as-prepared carbon possesses high specific surface area, rich nitrogen and oxygen, appropriate mesopore/micropore ratio and considerable small-sized mesopores. The addition of graphene oxide plays a key role in forming 4 nm mesopores. The sample PO–GO-16 presents the characteristics of large surface area (2196 m² g⁻¹), high mesoporosity (47.6%), as well as rich nitrogen (1.52 at.%) and oxygen (6.9 at.%). As a result, PO–GO-16 electrode shows an outstanding capacitive behavior: high capacitance (296 F g⁻¹) and ultrahigh-rate performance (192 F g⁻¹ at 10 A g⁻¹) in 6 M KOH aqueous electrolyte. The balanced structure characteristic, low-cost and high performance, make the porous carbon a promising electrode material for supercapacitors.