Journal Article

PUBDB-2026-01828

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png All-water supercapacitor enabled by 1-nm clay channels

Artemov, V. (Corresponding author)Extern* ; Babiy, S. ; Teng, Y. ; Ma, J. ; Ryzhov, A. ; Chen, T.-H. ; Navratilova, L. ; Boureau, V. ; Schouwink, P. ; Liseanskaia, M. ; Huber, P.Extern*DESY* ; Brushett, F. ; Laloui, L. ; Tagliabue, G. ; Radenovic, A.

2026
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41467-026-73924-1  doi:10.3204/PUBDB-2026-01828

Abstract: Water confined to channels one nanometer thick exhibits electrochemicalbehavior distinct from bulk water, including enhanced protonic conductivityand large dielectric anisotropy.Here, we exploit these characteristics to designa scalable electrochemical energy storage system-a “blue capacitor”-constructedentirely from naturally abundant materials. By assembling layeredclays and conductive graphene, we produce 1-nm-thick channels in whichconfined water acts as the sole electrolyte. We systematically study differentclay types, the electrode composition, and separator thickness using complementaryphysicochemical and electrochemical techniques. The deviceoperates stably up to 1.6 ± 0.1 V, achieves specific capacitances of 40 F g$^{−1}$,97 ± 2% coulombic efficiency, and stable performance overmore than 60,000 charge-discharge cycles at a voltage window of 1 V and a scan rate of 10 mA.Structural and dynamic analyses validate the device architecture, water purity,and proton transport in the nanopores. These results demonstrate thatnanoconfined water can function as an electrolyte in a macroscopic electrochemicaldevice, providing a platform for exploring sustainable aqueousenergy storage systems.

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Contributing Institute(s):

1. CIMMS-RA Center for integr. Multiscale M (CIMMS)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. DFG project G:(GEPRIS)533771286 - EXC 3120: BlueMat: Wassergesteuerte Materialien (533771286) (533771286)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2026

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