期刊
ACS NANO
卷 10, 期 1, 页码 747-754出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b05819
关键词
electrical double-layer capacitors; supercapacitors; subnanometer pores; graphene oxide; interlayer constrictions; in situ X-ray diffractometry
类别
资金
- Newnham College, Cambridge
- Cambridge Commonwealth Trust
- Dyson, Ltd.
- College Research Fellowship at Hughes Hall, Cambridge
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.
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