標題: X-ray Absorption Spectroscopic Study on Interfacial Electronic Properties of FeOOH/Reduced Graphene Oxide for Asymmetric Supercapacitors
作者: Chang, Han-Wei
Dong, Chung-Li
Lu, Ying-Rui
Huang, Yu-Cheng
Chen, Jeng-Lun
Chen, Chi Liang
Chou, Wu-Ching
Tsai, Yu-Chen
Chen, Jin-Ming
Lee, Jyh-Fu
電機學院
College of Electrical and Computer Engineering
關鍵字: Synchrotron X-ray absorption spectroscopy;Electronic structure;Asymmetric supercapacitor;Reduced graphene oxide;FeOOH/RGO;FeOOH/CNT
公開日期: 1-四月-2017
摘要: The effects of growth time and interface between the iron oxyhydroxide (FeOOH) and carbon materials (carbon nanotubes (CNT) and reduced graphene oxide (RGO)) to form an asymmetric supercapacitor was studied by X-ray absorption spectroscopy (XAS) and electrochemical measurements. FeOOH/CNT (FCNT) and FeOOH/RGO (FRGO) were successfully synthesized by a simple spontaneous redox reaction with FeC13. The RGO functions as an ideal substrate, providing rich growth sites for FeOOH, and it is believed to facilitate the transport of electrons/ions across the electrode/electrolyte interface. FRGO has been identified as a supercapacitor and found to exhibit significantly greater capacitance than FCNT. To gain further insight into the effects of growth times and the interface of FeOOH for FCNT and FRGO, the electronic structures of FCNT and FRGO with various FeOOH growth times were elucidated by XAS. The difference between the surface electronic structures of CNT and RGO yields different nucleation and growth rates of FeOOH of FeOOH. RGO with excellent interface properties arises from a high degree of covalent functionalization, and/or defects make it favorable for FeOOH growth. FRGO is therefore a promising electrode material for use in the fabrication of asymmetric supercapacitors. In this work, coupled XAS and electrochemical measurements reveal the electronic structure of the interface between FeOOH and the carbon materials and the capacitance performance of asymmetric supercapacitors, which are very useful in the fields of nanomaterials and nanotechnology, especially for their applications in storing energy.
URI: http://dx.doi.org/10.1021/acssuschemeng.6b02970
http://hdl.handle.net/11536/145310
ISSN: 2168-0485
DOI: 10.1021/acssuschemeng.6b02970
期刊: ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume: 5
起始頁: 3186
結束頁: 3194
顯示於類別:期刊論文