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All-in-one supercapacitors with high performance enabled by Mn/Cu doped ZnO and MXeneAmmar, Ameen UddinBakan-Misirlioglu, FerayAleinawi, Mohamad HasanFranzo, GiorgiaCondorelli, Guglielmo GuidoYesilbag, Fatma Nur TuzlucaYesilbag, Yasar OzkanMirabella, SalvoErdem, EmreCopper oxidesDefectsElectrodesII-VI semiconductorsParamagnetic resonancePhotoluminescence spectroscopyReaction kineticsSupercapacitorTransition metal oxidesZinc oxideCu-doped ZnODoped zinc oxidesManganese-doped zinc oxidesMn-doped ZnONegative electrodePerformancePositive electrodesZinc oxide nanoparticlesZinc oxide nanowiresZnO NWsTransition metalsHere, we report the development of high-performance supercapacitor devices using manganese-doped zinc oxide nanowires (Mn-doped ZnO NWs) and copper-doped zinc oxide nanoparticles (Cu-doped ZnO NPs) as a positive electrode with MXene as a negative electrode. Both transition metal (TM)-based electrodes were used separately with MXene, and the performance was tested. When used in combination with MXene as a second electrode, TM-ZnO samples displayed a major increase in the supercapacitors’ performance. The highest-performance supercapacitor recorded values of 151 F/g specific capacitance along with 84 Wh/kg energy density and a power density of 75 kW/kg. Electron paramagnetic resonance and photoluminescence spectroscopy of Mn/Cu-doped ZnO reveals intrinsic and extrinsic defect signals, which were discussed and attributed to the enhancement of the capacitive performance. The presence of the aforementioned defects optimizes the intrinsic properties and boosts the reaction kinetics, thus providing increased electrochemical activity and superior supercapacitor device performance. © 2023Elsevier Ltd2023Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/12054https://doi.org/10.1016/j.materresbull.2023.1123340025-5408enMaterials Research Bulletininfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/12054