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Accelerating ion diffusion with unique three-dimensionally interconnected nanopores for self-membrane high-performance pseudocapacitors

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Abstract

Herein, a unique three-dimensionally interconnected nanoporous structure (3-D INPOS) pseudocapacitor electrode, which possesses a large surface area, an efficient electron and ion transport, together with a remarkable structural stability, has been constructed via soft anodization of an aluminum alloy, cost-effective ultrasonic spray pyrolysis (USP)-assisted deposition of fluorine-doped tin oxide (FTO), and controllable electrochemical deposition of nanostructured manganese dioxide (MnO2). Taking the advantage of large surface area, the as-built 3-D INPOS pseudocapacitor electrode exhibits the highest areal capacitance of 540 mF cm−2 and a volumetric capacitance of 135 F cm−3, which is 53% higher than that achieved from the conventional 3-D nanopore pseudocapacitor electrode and 17.6 times higher than that of the planar electrode. More interestingly, the unique 3-D interconnected structure offers an unrestricted space for the diffusion of electrolyte ions. Thus, the 3-D INPOS electrode achieves a higher rate capability than the 3-D nanopore electrode. As a proof of concept, a symmetric self-membrane pseudocapacitor device was constructed by simply stacking two pieces of the 3-D INPOS electrodes. Without an added separator, the device possesses a largely reduced dead volume and achieves the highest volumetric capacitance of 28.9 F cm−3 and a specific energy of 2.36 mW h cm−3. The largely enhanced capacitance, rate capability, and specific energy certainly make the 3-D INPOS an ideal architecture for the fabrication of high-performance pseudocapacitors.

Graphical abstract: Accelerating ion diffusion with unique three-dimensionally interconnected nanopores for self-membrane high-performance pseudocapacitors

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Publication details

The article was received on 21 Aug 2017, accepted on 01 Nov 2017 and first published on 02 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR06234F
Citation: Nanoscale, 2017, Advance Article
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    Accelerating ion diffusion with unique three-dimensionally interconnected nanopores for self-membrane high-performance pseudocapacitors

    Y. Gao, Y. Lin, Z. Peng, Q. Zhou and Z. Fan, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR06234F

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