期刊
NANOMATERIALS
卷 11, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/nano11071731
关键词
hydrogen-evolution reaction; supercapacitor; agarose-bound activated carbon
类别
资金
- Ministry of Science and Technology, Taiwan
- MOST [109-2622-E-126-001, MOST 109-2113-M-213-001, MOST-109-2221-E-213-002-MY3]
By utilizing agarose as a novel binder, an activated carbon supercapacitor with a wider potential window was successfully fabricated, leading to enhanced energy density and excellent cycling performance.
The specific energy of an aqueous carbon supercapacitor is generally small, resulting mainly from a narrow potential window of aqueous electrolytes. Here, we introduced agarose, an ecologically compatible polymer, as a novel binder to fabricate an activated carbon supercapacitor, enabling a wider potential window attributed to a high overpotential of the hydrogen-evolution reaction (HER) of agarose-bound activated carbons in sulfuric acid. Assembled symmetric aqueous cells can be galvanostatically cycled up to 1.8 V, attaining an enhanced energy density of 13.5 W h/kg (9.5 mu W h/cm(2)) at 450 W/kg (315 mu W/cm(2)). Furthermore, a great cycling behavior was obtained, with a 94.2% retention of capacitance after 10,000 cycles at 2 A/g. This work might guide the design of an alternative material for high-energy aqueous supercapacitors.
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