Ying-Chu Chen1 Yu-Kuei Hsu2 Claus Feldmann1

1, Karlsruher Institut für Technologie, Karlsruhe, , Germany
2, National Dong Hwa University, Hualien City, , Taiwan

The pressing need for ultrahigh footprint-normalized capacitance emerges in the dimensional migration of hybrid supercapacitors.1 Herein, we demonstrate an advanced integration protocol mimicking natural Cuscutae, in which ribbon-like vanadium oxides creep along porous tunnels in a commercially available carbon host of low density.2 The biomimicry of the Cuscutae design converts the original pore network of submicrometre size into a mesoporous, aperiodic and three-dimensionally interconnected bi-continuous composite framework. Moreover, the massive infiltration of pseudocapacitive functionality onto a highly conductive carbon-cloth backbone leads to an unprecedented footprint-normalized capacitance exceeding 8 F cm-2. The biomimetic electrode design formulates a symmetric supercapacitor rendering a maximal footprint-normalized cell capacitance more than 4 F cm-2, a geometric energy density of 0.48 mW h cm-2 and a geometric power density of 36.8 mW cm-2 that are superior to commercial double-layer supercapacitors and most of the state-of-the-art hybrid supercapacitors and lithium-ion microbatteries, respectively.3

[1] Goesmann, H.; Feldmann. C. Angew. Chem. Int. Ed. 2010, 49, 1362.
[2] Chen, Y. C.; Hsu, Y. K.; Feldmann, C. 2017, in preparation.
[3] Pikul, J. H.; Zhang, H. G.; Cho, J.; Braun, P. V.; King, W. P. Nature Commun., 2013, 4, 1732.