Issue 42, 2024

Enhanced electrochemical performance of NiO surfaces via selective Li+ doping

Abstract

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 (IV) 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.

Graphical abstract: Enhanced electrochemical performance of NiO surfaces via selective Li+ doping

Supplementary files

Article information

Article type
Paper
Submitted
28 Aug 2024
Accepted
07 Oct 2024
First published
07 Oct 2024

Phys. Chem. Chem. Phys., 2024,26, 27141-27151

Enhanced electrochemical performance of NiO surfaces via selective Li+ doping

T. Sen, A. Biswas, U. G. Nair, R. Thangavel and T. K. Rout, Phys. Chem. Chem. Phys., 2024, 26, 27141 DOI: 10.1039/D4CP03362K

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