Preparation of a NiAl‐Oxide@Polypyrrole Composite for High‐Performance Supercapacitors

Abstract

A core‐shell NiAlO@polypyrrole composite (NiAlO@PPy) with a 3D “sand rose”‐like morphology was prepared via a facile in situ oxidative polymerization of pyrrole monomer, where the role of PPy coating thickness was investigated for high‐performance supercapacitors. Microstructure analyses indicated that the PPy was successfully coated onto the NiAlO surface to form a core‐shell structure. The NiAlO@PPy exhibited a better electrochemical performance than pure NiAlO, and the moderate thickness of the PPy shell layer was beneficial for expediting the electron transfer in the redox reaction. It was found that the NiAlO@PPy5 prepared at 5.0 mL L−1 addition amount of pyrrole monomer demonstrated the best electrochemical performance with a high specific capacitance of 883.2 F g−1 at a current density of 1 A g−1 and excellent capacitance retention of 91.82 % of its initial capacitance after 1000 cycles at 3 A g−1. The outstanding electrochemical performance of NiAlO@PPy5 were due to the synergistic effect of NiAlO and PPy, where the uniform network‐like PPy shell with the optimal thickness made electrolyte ions more easily accessible for faradic reactions. This work provided a simple approach for designing organic–inorganic core‐shell materials as high‐performance electrode materials for electrochemical supercapacitors.

One-step electrodeposition of a polypyrrole/NiO nanocomposite as a supercapacitor electrode

“…The clearly excellent long-term cycling stability of the Ppy1%-DBSA2%/NiO97%-GS@4 composite may be attributed to the porous network gapped structure and good conductivity, which were favorable for charge transportation and electrolyte diffusion 39 . The presence of NiO nanoparticles not only enhances the capacitance value but also improves the cycling stability 44 .

Figure 9 Cycling stability measurement of the pure Ppy 1% -DBSA 2% /GS and Ppy 1% -DBSA 2% /NiO 97% -GS@4 electrodes at 1 A g −1 for 1000 cycles.

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Pulse‐potential electrochemistry to boost real‐life application of pseudocapacitive dual‐doped polypyrrole

“…Figure 1F compares the FT-IR spectra of PP-PPy/FEG and CP-PPy/FEG. Typical characteristic vibrations of PPy are observed in both electrodes, including =C-H out-of-plane vibration at 895 cm −1 , 36 N-H in-plane deformation vibration at 1065 cm −1 , 37 C-H in-plane vibration at 1250 and 1340 cm −1 , 38,39 C-N stretching in pyrrole ring at 1250 and 1340 cm −1 , [40][41][42][43] and C═C of PPy rings at 1636 cm −1 . 44,45 It verifies the successful preparation of PPy through both pulsed/conventional potentiostatic polymerization method.…”