Item

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-Fe 2 O 3 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-Fe 2 O 3 is strengthening the junction and charge transfer between Fe 2 O 3 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-Fe 2 O 3 hybrid with weaker binding. In spite of the lower specific surface area and apparently similar energy storage mode, the CMK-3-P-Fe 2 O 3 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 Fe 2 O 3 -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. © 2019