Titanium oxide nanoparticle-embedded mesoporous manganese oxide microparticles for supercapacitor electrodes

Publication date: Available online 7 November 2019Source: Journal of Physics and Chemistry of SolidsAuthor(s): Haein Lee, Sohyun Jin, Sanggyu YimAbstractDue to increased contact between electrode and electrolyte, using nanoparticles (NPs) of manganese oxide (MnO2) as an electrode material improves the specific capacitance (Csp) of supercapacitors. However, this material is not yet commercially feasible because the voltammetric response drops rapidly with electrode thickness due to its poor electrical conductivity; also, the large-scale production of MnO2 NPs is significantly difficult. To overcome these limitations simultaneously, we propose mesoporous MnO2 microparticles incorporated with titanium dioxide (TiO2) NPs as the electrode material. The synthesized microparticles can be easily isolated with a simple filtration process, while the specific surface area is comparable to that of MnO2 NPs. The incorporation of TiO2 NPs improves the specific capacitance as well as the voltammetric response. A maximum Csp of 479 F/g measured at 10 mV/s is obtained and the retention at 100 mV/s is 61.3%, which values are 4.7 and 1.5 times larger, respectively, than those values of the TiO2-free MnO2 electrode.
Source: Journal of Physics and Chemistry of Solids - Category: Physics Source Type: research