Effect of Fe dopant concentration on electrochemical properties of Ni2P2O7 thin films

Exploring the electrochemical performance of Ferrous Nickel Pyrophosphate Thin Film Electrodes for Potential Supercapatior Applications

“…analysis establishes the fact that the energy gap decreases with the Fe concentration as found in earlier works [37]. 3+ and Fe 2+ to Fe 3+ occurring at the surface of FNP electrode materials [44,45]. The redox current increases when increasing the scan rate and also it is found that the redox peaks shift towards the right as well as the left of the potential window with a larger potential separation due to the resistance of electrode [45,46].…”

Improved Electrochemical Performance of Ni2P2O7 and Mn‐doped Ni2P2O7 Electrode Materials for Supercapacitor Applications

“…In Nyquist plot, starting point of semicircle is called solution resistance (R s ) and the obtained values of (R s ) for NP, MNP‐1, MNP‐2 and MNP‐3 thin film electrodes are 3.23, 3.01, 2.20 and 1.79 Ω, respectively. The minimum values of R s for MNP‐3 thin film electrode reveals its high conductivity evincing its high performance as found in CV and GCD analysis [25,34] . At high frequency region the formation of semicircle corresponds to charge transfer resistance (R ct ).…”

“…The minimum values of R s for MNP-3 thin film electrode reveals its high conductivity evincing its high performance as found in CV and GCD analysis. [25,34] At high frequency region the formation of semicircle corresponds to charge transfer resistance (R ct ). The values of R ct are observed to be 7.86, 3.85, 2.83 and 2.28 Ω for NP, MNP-1, MNP-2 and MNP-3 thin film electrodes respectively.…”

“…The presence of strong redox peaks at each CV curve represents the occurrence of Faradaic reactions indicating typical psedocapacitive behavior with excellent reversibility of NP and MNP based electrodes. [19,[34][35][36] These redox reactions take place during the interaction of OH À of electrolyte with NP and MNP electrodes as follows;…”

“…Figure 6(a–d) shows the cyclic voltammetry (CV) curves of Ni 2 P 2 O 7 and Mn doped Ni 2 P 2 O 7 thin film electrodes at different scan rates. The presence of strong redox peaks at each CV curve represents the occurrence of Faradaic reactions indicating typical psedocapacitive behavior with excellent reversibility of NP and MNP based electrodes [19,34–36] . These redox reactions take place during the interaction of OH − of electrolyte with NP and MNP electrodes as follows;12 $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {{\rm N}{\rm i}}_{2}{{\rm P}}_{2}{{\rm O}}_{7}+{\rm \ }{2{\rm O}{\rm H}}^{-}\leftrightarrow {\rm \ }{{\rm N}{\rm i}}_{2}{{\rm P}}_{2}{{\rm O}}_{7}{\rm \ }{\left({\rm O}{\rm H}\right)}^{-}+{\rm \ }{2{\rm e}}^{-}\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {{{\rm M}{\rm n}}_{2}{\rm N}{\rm i}}_{2}{{\rm P}}_{2}{{\rm O}}_{7}+{\rm \ }{2{\rm O}{\rm H}}^{-}\leftrightarrow {\rm \ }{{{\rm M}{\rm n}}_{2}{\rm N}{\rm i}}_{2}{{\rm P}}_{2}{{\rm O}}_{7}{\rm \ }{\left({\rm O}{\rm H}\right)}^{-}+{\rm \ }{2{\rm e}}^{-}\hfill\cr}}$$$ …”