Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 6, Pages 919-930Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201504019
Keywords
amorphous; iron oxyhydroxide; mesoporous; quantum dots; supercapacitors
Categories
Funding
- National Natural Science Foundation of China [51572129, U1407106, 51202106, 51402152]
- Natural Science Foundation of Jiangsu Province [BK20131349]
- QingLan Project of Jiangsu Province
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Fundamental Research Funds for the Central Universities [30915011204]
Ask authors/readers for more resources
Previous research on iron oxides/hydroxides has focused on the crystalline rather than the amorphous phase, despite that the latter could have superior electrochemical activity due to the disordered structure. In this work, a simple and scalable synthesis route is developed to prepare amorphous FeOOH quantum dots (QDs) and FeOOH QDs/graphene hybrid nanosheets. The hybrid nanosheets possess a unique heterostructure, comprising a continuous mesoporous FeOOH nanofilm tightly anchored on the graphene surface. The amorphous FeOOH/graphene hybrid nanosheets exhibit superior pseudocapacitive performance, which largely outperforms the crystalline iron oxides/hydroxides-based materials. In the voltage range between -0.8 and 0 V versus Ag/AgCl, the amorphous FeOOH/graphene composite electrode exhibits a large specific capacitance of about 365 F g(-1), outstanding cycle performance (89.7% capacitance retention after 20 000 cycles), and excellent rate capability (189 F g(-1) at a current density of 128 A g(-1)). When the lower cutoff voltage is extended to -1.0 and -1.25 V, the specific capacitance of the amorphous FeOOH/graphene composite electrode can be increased to 403 and 1243 F g(-1), respectively, which, however, compromises the rate capability and cycle performance. This work brings new opportunities to design high-performance electrode materials for supercapacitors, especially for amorphous oxides/hydroxides-based materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available