Coupling effect between ultra-small Mn₃O₄ nanoparticles and porous carbon microrods for hybrid supercapacitors

详细信息    查看全文

• 作者：Rutao Wang^a ; ^b ; Pan Liu^c ; Junwei Lang^a ; Li Zhang^b ; ^{lizhang@mae.cuhk.edu.hk} ; Xingbin Yan^a ; ^{xbyan@licp.cas.cn}
• 关键词：Hybrid supercapacitor ; Manganese oxide ; Porous carbon ; Microstructure ; Energy storage
• 刊名：Energy Storage Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：6
• 期：Complete
• 页码：53-60
• 全文大小：1563 K
• 卷排序：6

文摘

Hybrid supercapacitor, which is an energy storage device that combines a low-energy/fast double-layer electrode and a high-energy/sluggish faradaic redox electrode, could realize further gains in energy/power density if the capacity and rate gaps of the two electrodes are properly balanced. Herein, a microrod-like architecture that incorporates Mn3O4 nanoparticles on/in highly porous carbon rods (PCR) scaffold (denoted as Mn-PCR composite) is designed for this purpose. The optimized Mn-PCR composite exhibits large Li-ion storage capacity and fast charge/discharge rate, mainly stemming from its distinct microrod-like architecture and porous structure. We then employ Mn-PCR composite as the anode and PCR as the cathode to fabricate a hybrid supercapacitor, which yields an ultrahigh energy density of 174 W h kg−1 at 200 W kg−1 and retains 74.5 W h kg−1 at a high power density of 10 kW kg−1.