Phosphine Plasma Activation of α-Fe 2 O 3 for High Energy Asymmetric Supercapacitors
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Emwas, Abdul-Hamid M.
Anjum, Dalaver H.
Alshareef, Husam N.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
Imaging and Characterization Core Lab
Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
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AbstractWe report a phosphine (PH3) plasma activation strategy for significantly boosting the electrochemical performance of supercapacitor electrodes. Using Fe2O3 as a demonstration, we show that the plasma activation simultaneously improves the conductivity, creates atomic-scale vacancies (defects), as well as increases active surface area, and thus leading to a greatly enhanced performance with a high areal capacitance of 340 mF cm-2 at 1 mA cm-2, compared to 66 mF cm-2 of pristine Fe2O3. Moreover, the asymmetric supercapacitor devices based on plasma-activated Fe2O3 anodes and electrodeposited MnO2 cathodes can achieve a high stack energy density of 0.42 mWh cm-3 at a stack power density of 10.3 mW cm-3 along with good stability (88% capacitance retention after 9000 cycles at 10 mA cm-2). Our work provides a simple yet effective strategy to greatly enhance the electrochemical performance of Fe2O3 anodes and to further promote their application in asymmetric supercapacitors.
CitationLiang H, Xia C, Emwas A-H, Anjum DH, Miao X, et al. (2018) Phosphine Plasma Activation of α-Fe 2 O 3 for High Energy Asymmetric Supercapacitors. Nano Energy. Available: http://dx.doi.org/10.1016/j.nanoen.2018.04.032.
SponsorsResearch reported in this publication was supported by King Abdullah University of Science and Technology (KAUST).