| 초록 |
Electrochemical energy conversion and storage devices are recognized as the most feasible method to increase the share of renewables in the energy mix. In this regard, porous nanomaterials with open voids and rapid mass transport possess excellent electrochemical properties. Here, a hierarchically porous FeCoS aerogel is reported as an exceptionally efficient electrode for OER and pseudocapacitor applications with an overpotential of 335 mV at 500 mA/cm^2 and a capacitance of 3983 F/g at 1 A/g, revealing a robust performance for 50 h at 100 mA/cm^2 for OER and retaining 70% of the initial capacitance after 5000 cycles at 10 A/g. Increased number of moderately binding active sites, fast charge transportation prompted by hierarchical porosity, and declined dissolution rate of S and Fe after Co-doping, resulted in a favorably modified active surface and increased capacity retention. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government(MSIT) (No. 2020R1A5A1019131). |
