Nanostructured electrode materials,known for their exceptional electrochemical properties,are pivotal in advancing high-performance energy storage devices to address increasing global energy demands.A biochar ferrite ...Nanostructured electrode materials,known for their exceptional electrochemical properties,are pivotal in advancing high-performance energy storage devices to address increasing global energy demands.A biochar ferrite nanocomposite(NC)was synthesized via ultrasonication and utilized to synthesize working electrodes(WEs)for energy storage applications.The prepared NC and electrodes were thoroughly characterized via Fourier transform infrared spectroscopy(FTIR),Ultra violet diffused reflectance spectroscopy(UV-DRS),X-ray diffraction(XRD)and scanning electron microscopy(SEM)analysis,along with electrical and electrochemical techniques.WEs were fabricated by coating slurries of NC and polyvinyl butyral in N-methyl-2-pyrrolidone onto mild steel current collectors(CCs),and the WEs with the highest electrical conductivity were selected for further electrochemical analysis.Key electrochemical parameters,including specific capacitance(C_(s),F/g),electrochemical impedance spectroscopy(EIS),and direct current conductivity(DC)polarization,were studied in a 1.0 mol/L KOH solution with reference to the Ag/AgCl electrode.Cyclic voltammetry indicated that the NC modified electrode achieved a C_(s) of 570.60 F/g at a scan rate of 25 mV/s,within the potential range of 0–0.6 V.This value is higher than that of many conventional biochar-based(C_(s)~300–400 F/g)or ferrite-based composite electrodes(C_(s)~400–500 F/g).Moreover,the cycling stability of 99.93%capacitance retention over 5000 cycles is superior to that of several reported supercapacitor electrodes,which often exhibit a retention of~90%–95%over similar cycling conditions.EIS data,along with potentiodynamic polarization and morphological evaluations,demonstrated the enhanced electrochemical stability of the selected electrode,which exhibited a low corrosion rate of 0.02 mm/a.This work holds promising potential for developing advanced and sustainable energy storage systems,addressing the growing global demand for efficient and durable supercapacitor technologies.展开更多
基金supported by the existing facilities of the Department of Chemistry, College of Basic Sciences and Humanities, G.B. Pant University of Agriculture and Technology, Pantnagar.
文摘Nanostructured electrode materials,known for their exceptional electrochemical properties,are pivotal in advancing high-performance energy storage devices to address increasing global energy demands.A biochar ferrite nanocomposite(NC)was synthesized via ultrasonication and utilized to synthesize working electrodes(WEs)for energy storage applications.The prepared NC and electrodes were thoroughly characterized via Fourier transform infrared spectroscopy(FTIR),Ultra violet diffused reflectance spectroscopy(UV-DRS),X-ray diffraction(XRD)and scanning electron microscopy(SEM)analysis,along with electrical and electrochemical techniques.WEs were fabricated by coating slurries of NC and polyvinyl butyral in N-methyl-2-pyrrolidone onto mild steel current collectors(CCs),and the WEs with the highest electrical conductivity were selected for further electrochemical analysis.Key electrochemical parameters,including specific capacitance(C_(s),F/g),electrochemical impedance spectroscopy(EIS),and direct current conductivity(DC)polarization,were studied in a 1.0 mol/L KOH solution with reference to the Ag/AgCl electrode.Cyclic voltammetry indicated that the NC modified electrode achieved a C_(s) of 570.60 F/g at a scan rate of 25 mV/s,within the potential range of 0–0.6 V.This value is higher than that of many conventional biochar-based(C_(s)~300–400 F/g)or ferrite-based composite electrodes(C_(s)~400–500 F/g).Moreover,the cycling stability of 99.93%capacitance retention over 5000 cycles is superior to that of several reported supercapacitor electrodes,which often exhibit a retention of~90%–95%over similar cycling conditions.EIS data,along with potentiodynamic polarization and morphological evaluations,demonstrated the enhanced electrochemical stability of the selected electrode,which exhibited a low corrosion rate of 0.02 mm/a.This work holds promising potential for developing advanced and sustainable energy storage systems,addressing the growing global demand for efficient and durable supercapacitor technologies.
