Understanding Capacitance Variation in Sub-nanometer Pores by in Situ Tuning of Interlayer Constrictions

Autor(en)

Dona T. L. Galhena, Bernhard C. Bayer, Stephan Hofmann, Gehan A. J. Amaratunga

Abstrakt

The contribution of subnanometer pores in carbon electrodes to the charge-storage mechanism in supercapacitors has been the subject of intense debate for over a decade. Here, we provide a model system based on graphene oxide, which employs interlayer constrictions as a model for pore sizes that can be both controllably tuned and studied in situ during supercapacitor device use. Correlating electrochemical performance and in situ tuning of interlayer constrictions, we observe a peak in specific capacitance when interlayer constriction size reaches the diameters of unsolvated ions, supporting the hypothesized link between loss of ion solvation shell and anomalous capacitance increase for subnanometer pores.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

University of Cambridge, Sri Lanka Inst Nanotechnol SLINTEC

Journal

ACS Nano

Band

10

Seiten

747-754

Anzahl der Seiten

8

ISSN

1936-0851

DOI

https://doi.org/10.1021/acsnano.5b05819

Publikationsdatum

01-2016

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik, 210006 Nanotechnologie

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeiner Maschinenbau, Allgemeine Physik und Astronomie, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5ef30556-f63f-4767-b88f-fa9d88ac9b6a