Yu-Ting WENGTsung-Yi CHENJeng-Lung CHENNAE-LIH WU2024-07-222024-07-222024-07-0113443542https://www.scopus.com/record/display.uri?eid=2-s2.0-85197449879&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/719930Possessing high electronic conductivity and the nature of chemical inertness, the Magnéli phase titanium oxide Ti4O7 is a promising material for various electrochemical applications. Herein, the Ti4O7 electrode in aqueous Li2SO4 electrolyte is characterized for its supercapacitor applications. The oxide electrode exhibits pseudocapacitive behavior over a wide potential range of +1.0 V (vs. Ag/AgCl), showing a specific capacitance of 105 F g-1, equivalent to 85 μF cm-2-oxide, along with outstanding high-rate performance and cycle stability (96% capacitance retention after 5000 cycles). In situ X-ray absorption near-edge spectroscopy analysis on the Ti K-edge absorption reveals that the pseudocapacitance does not involve the redox reaction of the oxide electrode material. A pseudocapacitance mechanism attributed to the reversible redox reactions of the hydrogen and oxygen atoms adsorbed on the oxide surface is proposed.trueIn Situ X-ray Absorption Near-edge SpectroscopyPseudocapacitance MechanismSupercapacitorTi4O7journal article10.5796/electrochemistry.24-700302-s2.0-85197449879