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Oxygen vacancy-enriched MoO3−x nanobelts for asymmetric supercapacitors with excellent room/low temperature performance.
- Source :
- Journal of Materials Chemistry A; 6/7/2019, Vol. 7 Issue 21, p13205-13214, 10p
- Publication Year :
- 2019
-
Abstract
- Oxygen vacancy-enriched MoO<subscript>3−x</subscript> nanobelts with oxygen vacancies up to 20% (equal to MoO<subscript>2.4</subscript>) were synthesized and demonstrated fast reaction kinetics. An asymmetric supercapacitor was assembled with active carbon (AC) as the anode and the as-prepared MoO<subscript>3−x</subscript> nanobelts as the cathode. A new aqueous electrolyte of H<subscript>2</subscript>SO<subscript>4</subscript>/ethylene glycol (EG) was investigated and found to work appropriately at low temperatures, even at −25 °C. The MoO<subscript>3−x</subscript> nanobelts electrode possesses excellent specific capacitance, rate capacity (1230 F g<superscript>−1</superscript> and 1220 F g<superscript>−1</superscript> at 5 A g<superscript>−1</superscript> and 50 A g<superscript>−1</superscript>, respectively) and cycle performance (100% after 38 000 cycles). Its energy and power densities reached 111 W h kg<superscript>−1</superscript> and 803 W kg<superscript>−1</superscript> or 50 W h kg<superscript>−1</superscript> and 27 321 W kg<superscript>−1</superscript> and maintained 80 W h kg<superscript>−1</superscript> and 794 W kg<superscript>−1</superscript> or 17 W h kg<superscript>−1</superscript> and 23 565 W kg<superscript>−1</superscript> at −25 °C. It is hypothesized that the coexistence of oxygen vacancies and low valence Mo ions enhanced both mass and charge transport kinetics and catalyzed the redox reactions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 7
- Issue :
- 21
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 136691693
- Full Text :
- https://doi.org/10.1039/c9ta03471d