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Design of Advanced MnO/N‐Gr 3D Walls through Polymer Cross‐Linking for High‐Performance Supercapacitor
Author(s) -
Tran Ngoc Quang,
Kang Bong Kyun,
Tiruneh Sintayehu Nibret,
Yoon Dae Ho
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504426
Subject(s) - supercapacitor , electrolyte , materials science , capacitance , polyvinylpyrrolidone , chemical engineering , electrochemistry , graphene , thermal stability , aqueous solution , nanotechnology , electrode , polymer chemistry , chemistry , organic chemistry , engineering
Three‐dimensional, vertically aligned MnO/nitrogen‐doped graphene (3D MnO/N‐Gr) walls were prepared through facile solution‐phase synthesis followed by thermal treatment. Polyvinylpyrrolidone (PVP) was strategically added to generate cross‐links to simultaneously form 3D wall structures and to incorporate nitrogen atoms into the graphene network. The unique wall features of the as‐prepared 3D MnO/N‐Gr hybirdes provide a large surface area (91.516 m 2 g −1 ) and allow for rapid diffusion of the ion electrolyte, resulting in a high specific capacitance of 378 F g −1 at 0.25 A g −1 and an excellent charge/discharge stability (93.7 % capacity retention after 8000 cycles) in aqueous 1 m Na 2 SO 4 solution as electrolyte. Moreover, the symmetric supercapacitors that were rationally designed by using 3D MnO/N‐Gr hybrids exhibit outstanding electrochemical performance in an organic electrolyte with an energy density of 90.6 Wh kg −1 and a power density of 437.5 W kg −1 .