We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Sub‐nanometer, Ultrafine α‐Fe<sub>2</sub>O<sub>3</sub> Sheets Realized by Controlled Crystallization Kinetics for Stable, High‐Performance Energy Storage.
- Authors
Wang, Cancan; Zhang, Long; Li, Mengxiong; Zhang, Jiajia; Chen, Yufei; Sun, Minqiang; Dong, Lei; Lu, Hongbin
- Abstract
The development of energy devices based on iron oxides/hydroxides is largely hindered by their poor conductivity and large volume changes, especially with regard to specific capacitance and cycle stability. Herein, superior capacitance (1575 F g−1 at 1.25 A g−1) and high rate performance (955 F g−1 at 25 A g−1) were realized by synthesizing sub‐nanometer, ultrafine α‐Fe2O3 sheets loaded on graphene (SU‐Fe2O3‐rGO). An assembled asymmetric supercapacitor showed outstanding cycle stability (106 % retention after 30 000 cycles). This excellent performance arises from the unique structural characteristics of the α‐Fe2O3 sheets, which not only enrich electrochemically reactive sites, but also largely eliminate the volume changes after long‐term charge/discharge cycling. The synthesis of SU‐Fe2O3‐rGO critically depends on control of the crystallization kinetics during growth. A controlled heterogeneous nucleation mechanism results in the formation of atomically thin α‐Fe2O3 sheets on graphene rather than large particles in solvent, as clarified by theoretical calculations. This strategy paves a new way to synthesizing atomically thin transition metal oxide sheets and low‐cost, eco‐friendly iron‐based energy storage. Finer electrodes: Sub‐nanometer, ultrasmall iron oxide nanosheets on reduced graphene oxide sheets were prepared by means of controlled crystallization kinetics (see figure) and investigated as anode materials for energy‐storage devices. SU‐Fe2O3‐rGO exhibits high specific capacitance and superb capacitance retention, both of which are superior to those of other reported asymmetric supercapacitors based on iron oxides.
- Subjects
CRYSTALLIZATION kinetics; ENERGY storage; TRANSITION metal oxides; FERRIC oxide; ELECTROCRYSTALLIZATION
- Publication
Chemistry - A European Journal, 2019, Vol 25, Issue 19, p5005
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201805593