Ti3C2 is considered as a promising electrode material for supercapacitors due to its excellent electronic conductivity and chemical stability. However, the relatively low specific capacitance of Ti3C2 hinders its further development in supercapacitors. Herein, the nitrogen and oxygen co-doped [email protected]3C2 composites have been synthesized through an in-situ polymerization method under annealing atmospheres of Ar and the mixture of Ar and NH3. The concentrations of doped N and O vary with the reaction atmosphere, thus influencing the electrochemical performance of the electrode material. Due to the synergistic effect of the additional pseudocapacitance provided by the abundant O- and N- functional groups in the carbon and the excellent electronic conductivity of Ti3C2, N, O co-doped [email protected]3C2 composite with N concentration of 9.5% exhibits a specific capacitance of 250.6 F g−1 at 1 A g−1, remaining 94% retention after 5000 cycles. Furthermore, the N, O co-doped [email protected]3C2 composite-based symmetric supercapacitor shows an energy density as high as 10.8 Wh kg−1 at a power density of 600 W kg−1 with excellent cycling stability. This study demonstrates that the performance of MXene-based supercapacitors can be greatly enhanced by designing and modifying with rich pseudocapacitive materials.
","titleZh":"氮和氧共掺杂的简便合成[电子邮件保护] 3 c ^ 2 MXene高性能超级电容器对称","summaryZh":"Ti 3 C 2具有出色的电导率和化学稳定性，因此被认为是超级电容器的有希望的电极材料。然而，Ti 3 C 2的相对较低的比电容阻碍了其在超级电容器中的进一步发展。在此，通过在Ar和Ar与NH 3的混合物的退火气氛下通过原位聚合方法合成了氮和氧共掺杂的[受电子邮件保护的] 3 C 2复合材料。。掺杂的N和O的浓度随反应气氛而变化，从而影响电极材料的电化学性能。由于碳中丰富的O-和N-官能团以及Ti 3 C 2，N，O与N共掺杂[电子邮件保护] 3 C 2复合材料提供的额外假电容的协同作用，当浓度为9.5％时，在1 A g -1下显示的比电容为250.6 F g -1，在5000次循环后仍保持94％的保留率。此外，N，O共掺杂[受电子邮件保护] 3 C 2基于复合材料的对称超级电容器在600 W kg -1的功率密度下显示出高达10.8 Wh kg -1的能量密度，具有出色的循环稳定性。这项研究表明，通过使用丰富的伪电容材料进行设计和修改，可以大大提高基于MXene的超级电容器的性能。
","hasTranslation":true,"translationState":1,"keywordCheckState":1,"keywordCheckDate":1609776000000,"aliyunCheckState":0,"publishStatus":"Issue","publishDate":1567612800000,"pubDate":"2019-09-05","url":"https://www.sciencedirect.com/science/article/pii/S0378775319310614","createDate":1567612800000,"createUserId":1,"updateDate":1567612800000,"updateUserId":1,"del":false,"state":1,"year":"2019","volume":"439","page":"227068","keywordList":["Ti3C2MXene"," N"," O co-doping"," [email protected]3C2composite"," Electrochemical energy storage"," Symmetric supercapacitor"],"authorList":["Zhihu Pan","Xiaohong Ji"],"affiliationFrom":"CROSSREF,ORCID","author":"Zhihu Pan, Xiaohong Ji","updateDateWithoutTime":1567612800000,"impactFactor":7.9,"oldThesisId":7900740,"paperSource":0,"journalName":"Journal of Power Sources","journalShortName":"J. Power Sources","journalOnlyAdvanced":false,"isChinese":false,"docsActive":true},"journalInfo":{"journalInfoId":"1201710360944250880","journalId":117},"joa":false}}