CUED Publications database

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

Galhena, DTL and Bayer, BC and Hofmann, S and Amaratunga, GAJ (2016) Understanding Capacitance Variation in Sub-nanometer Pores by in Situ Tuning of Interlayer Constrictions. ACS Nano, 10. pp. 747-754.

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: electrical double-layer capacitors graphene oxide in situ X-ray diffractometry interlayer constrictions subnanometer pores supercapacitors
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:54
Last Modified: 23 Nov 2017 03:32
DOI: