Phosphine Plasma Activation of α-Fe 2 O 3 for High Energy Asymmetric Supercapacitors

Hanfeng Liang, Chuan Xia, Abdul-Hamid M. Emwas, Dalaver H. Anjum, Xiaohe Miao, Husam N. Alshareef

Research output: Contribution to journalArticlepeer-review

106 Scopus citations

Abstract

We 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.
Original languageEnglish (US)
Pages (from-to)155-162
Number of pages8
JournalNano Energy
Volume49
DOIs
StatePublished - Apr 12 2018

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