title: Enrichment of Pyrrolic Nitrogen by Hole Defects in Nitrogen and Sulfur Co-Doped Graphene Hydrogel for Flexible Supercapacitors.
abstract: The effect of the doping configuration and concentration of nitrogen (N) and sulfur (S) on the electrochemical performance of 3 D N and S co-doped hole defect graphene hydrogel (NS-HGH) electrodes is investigated. Surprisingly, by introducing a hole defect on the graphene surface, the difference in the doping concentrations of N and S can be used to effectively modulate the electrochemical behavior of the NS-HGH. The hole defects provide a rapid ion diffusion path. Finally, we showed that the intriguing specific capacitance (536 F g(-1) ) of the NS-HGH could enhance the overall performance of the pseudocapacitance and electric double layer capacitance. The rational design of the NS-HGH-based flexible solid state supercapacitor results in not only outstanding electrochemical performance with a maximum energy density of 14.8 Wh kg(-1) and power density of 5.2 KW kg(-1) but also in extraordinary mechanical flexibility and excellent cycle stability.
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro,Jangan-gu, Suwon-si, Gyeong gi-do, Republic of Korea.
authors.forename: Ngoc Quang
authors.initials: NQ
authors.lastname: Tran
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro,Jangan-gu, Suwon-si, Gyeong gi-do, Republic of Korea.
authors.forename: Bong Kyun
authors.initials: BK
authors.lastname: Kang
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro,Jangan-gu, Suwon-si, Gyeong gi-do, Republic of Korea.
authors.forename: Moo Hyun
authors.initials: MH
authors.lastname: Woo
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro,Jangan-gu, Suwon-si, Gyeong gi-do, Republic of Korea. dhyoon@skku.edu.|SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, 2066, Seobu-ro,Jangan-gu, Suwon-si, Gyeong gi-do, Republic of Korea. dhyoon@skku.edu.
authors.forename: Dae Ho
authors.initials: DH
authors.lastname: Yoon
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D025802:Electric Capacitance; D004563:Electrochemistry; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009584:Nitrogen / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*
chemical_list: D011758:Pyrroles; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D003035:Cobalt; D013455:Sulfur; D006108:Graphite; D009584:Nitrogen
keywords: doping; graphene; hole defect; hydrogels; supercapacitors