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  Strong metal oxide-support interactions in carbon/hematite nanohybrids activate novel energy storage modes for ionic liquid-based supercapacitors

Lai, F., Feng, J., Heil, T., Wang, G.-C., Adler, P., Antonietti, M., et al. (2019). Strong metal oxide-support interactions in carbon/hematite nanohybrids activate novel energy storage modes for ionic liquid-based supercapacitors. Energy Storage Materials, 20, 188-195. doi:10.1016/j.ensm.2019.04.035.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-1246-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-06E6-F
Genre: Journal Article

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 Creators:
Lai, Feili1, Author              
Feng, Jianrui, Author
Heil, Tobias2, Author              
Wang, Gui-Chang, Author
Adler, Peter, Author
Antonietti, Markus3, Author              
Oschatz, Martin1, Author              
Affiliations:
1Martin Oschatz, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364733              
2Nadezda V. Tarakina, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2522693              
3Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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Free keywords: Supercapacitor, Nanohybrid, Iron oxide, Ionic liquid, Ordering transitions, Main text
 Abstract: Strong metal oxide-support interaction is crucial to activate high energy storage modes of carbon-supported hybrid electrodes in ionic liquid-based supercapacitors. Although it is known that conductive supports can influence the electrochemical properties of metal oxides, insights into how metal oxide-support interactions can be exploited to optimize joint energy storage properties are lacking. We report the junction between α-Fe2O3 nanosplotches and phosphorus-doped ordered mesoporous carbon (CMK-3-P) with strong covalent anchoring of the metal oxide. The oxide-carbon interaction in CMK-3-P-Fe2O3 is strengthening the junction and charge transfer between Fe2O3 and CMK-3-P. It enhances energy storage by intensifying the interaction between ionic liquid ions and the surface of the electrode. Density functional theory simulations reveal that the strong metal oxide-support interaction increases the adsorption energy of ionic liquid to −4.77 eV as compared to −3.85 eV for a CMK-3-Fe2O3 hybrid with weaker binding. In spite of the lower specific surface area and apparently similar energy storage mode, the CMK-3-P-Fe2O3 exhibits superior electrical double-layer capacitor performance with a specific capacitance of 179 F g−1 at 2 mV s−1 (0–3.5 V) in comparison to Fe2O3-free CMK-3 and CMK-3-P reference materials. This principle for design of hybrid electrodes can be applicable for future rational design of stable metal oxide-support electrodes for advanced energy storage.

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 Dates: 2019-05-042019
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.ensm.2019.04.035
BibTex Citekey: LAI2019188
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Title: Energy Storage Materials
Source Genre: Journal
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Publ. Info: Elsevier
Pages: - Volume / Issue: 20 Sequence Number: - Start / End Page: 188 - 195 Identifier: ISSN: 2405-8297