Integrated titanium-substituted air stable O3 sodium layered oxide electrode via a complexant assisted route for high capacity sodium-ion battery

Enhanced electrochemical performance of NiO surfaces via selective Li+ doping

The effects of selective Li+ doping on NiO films' structural, optical and electrochemical properties were investigated in this study. Our results highlighted a strong correlation among bandgap modulation, conductivity and selective Li-ion doping on the surfaces of NiO films. Electrochemical impedance spectroscopy (EIS) demonstrated the impact of subtle Li+ doping on the electrochemical behavior of the NiO thin films due to an increase in the diffusion resistance (Rd) up to 49.32 Ω for 0.5% Li-doped NiO, suggesting faster and more efficient hole transport from the electrode to electrolyte unlike NiO:Li4.0% electrodes. A linear and symmetric forward curve demonstrating ohmic behaviour was observed only for 0.5% Li-doped NiO thin films during current-voltage (I-V) analysis. Interestingly, the 0.5% Li-doped NiO films, which exhibited the largest anodic peak area in the CV curve under illumination, outperformed the 4.0% Li-doped NiO films in electrochemical activity, emphasizing the effectiveness of minimal doping.