K2Ti6O13 Nanoparticle-Loaded Porous rGO Crumples for Supercapacitors  

作　　者：Chongmin Lee Sun Kyung Kim Hankwon Chang Hee Dong Jang 

机构地区：[1]Department of Nanomaterials Science and Engineering,University of Science and Technology,Yuseong‑gu,Daejeon 34113,Republic of Korea [2]Resources Utilization Research Center,Korea Institute of Geoscience and Mineral Resources,Yuseong‑gu,Daejeon 34132,Republic of Korea

出　　处：《Nano-Micro Letters》2020年第1期115-123,共9页纳微快报（英文版）

基　　金：supported as a Basic Research Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM);funded by the Ministry of Science and ICT

摘　　要：One-dimensional alkali metal titanates containing potassium,sodium,and lithium are of great concern owing to their high ion mobility and high specific surface area.When those titanates are combined with conductive materials such as graphene,carbon nanotube,and carbon nanofiber,they are able to be employed as efficient electrode materials for supercapacitors.Potassium hexa-titanate(K2Ti6O13,KTO),in particular,has shown superior electrochemical properties compared to other alkali metal titanates because of their large lattice parameters induced by the large radius of potassium ions.Here,we present porous rGO crumples(PGC)decorated with KTO nanoparticles(NPs)for application to supercapacitors.The KTO NP/PGC composites were synthesized by aerosol spray pyrolysis and post-heat treatment.KTO NPs less than 10 nm in diameter were loaded onto PGCs ranging from 3 to 5μm.Enhanced porous structure of the composites was obtained by the activation of rGO by adding an excessive amount of KOH to the composites.The KTO NP/PGC composite electrodes fabricated at the GO/KOH/TiO2 ratio of 1:3:0.25 showed the highest performance(275 F g−1)in capacitance with different KOH concentrations and cycling stability(83%)after 2000 cycles at a current density of 1 A g−1.One-dimensional alkali metal titanates containing potassium,sodium,and lithium are of great concern owing to their high ion mobility and high specific surface area.When those titanates are combined with conductive materials such as graphene,carbon nanotube,and carbon nanofiber,they are able to be employed as efficient electrode materials for supercapacitors.Potassium hexa-titanate(K2 Ti6 O13,KTO),in particular,has shown superior electrochemical properties compared to other alkali metal titanates because of their large lattice parameters induced by the large radius of potassium ions.Here,we present porous rGO crumples（PGC） decorated with KTO nanoparticles（NPs） for application to supercapacitors.The KTO NP/PGC composites were synthesized by aerosol spray pyrolysis and post-heat treatment.KTO NPs less than 10 nm in diameter were loaded onto PGCs ranging from 3 to 5 μm.Enhanced porous structure of the composites was obtained by the activation of rGO by adding an excessive amount of KOH to the composites.The KTO NP/PGC composite electrodes fabricated at the GO/KOH/TiO2 ratio of 1:3:0.25 showed the highest performance(275 F g-1) in capacitance with different KOH concentrations and cycling stability（83%） after 2000 cycles at a current density of 1 A g-1.

关 键 词：Potassium hexa-titanate Porous graphene crumples SUPERCAPACITORS 

分 类 号：TM53[电气工程—电器]