کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1564578 | 1513999 | 2016 | 7 صفحه PDF | دانلود رایگان |
Pseudocapacitive storage of monovalent alkali cations, such as Li+ and Na+, is critically important for the development of metal-ion capacitors. Functional carbon materials decorated with ketone-containing groups are excellent candidates for this purpose. An epoxidation approach was deployed in this work to decorate electroactive oxygen groups on a high surface area nanoporous carbon with aligned mesopores. Because of the turbostratic structure, the intermediate epoxides dissipated into double-bonded oxygen groups in the functionalized carbon. The synergy of large porosity, good conductivity and enhanced surface redox activity endows the functionalized carbon cathode with high capacity (313 mA h/g@50 mA/g), good stability (>200 cycles) and high rate capability (148 mA h/g@400 mA/g).
Through epoxidation, an oxidized nanoporous carbon cathode with extraordinary pseudocapacitive Li-storage capacity was fabricated. The cathode showed improved rate performance as well as long-term stability that are beneficial for high power lithium ion capacitors.Figure optionsDownload as PowerPoint slide
Journal: Energy Storage Materials - Volume 2, January 2016, Pages 14–20