An Advanced NiCoFeO/Polyaniline Composite for High‐Performance Supercapacitors

Abstract

To reduce the charge‐transfer resistance of supercapacitors and achieve faster reversible redox reactions, ternary Ni‐Co‐Fe layered double hydroxide was prepared by using the urea method and then calcined to give NiCoFe oxide (NiCoFeO). To enhance conductivity, a polyaniline (PANI) conductive layer was assembled on the surface of the NiCoFeO particles by in situ oxidative polymerization of aniline monomers. The as‐prepared NiCoFeO/PANI composite was successful employed as a supercapacitor electrode. It was found that the NiCoFeO/PANI composite displayed good cycling stability, with a capacity loss of only 29.54 % after 5000 cycles. Furthermore, the NiCoFeO/PANI composite also exhibited excellent supercapacitor performance, with a high specific capacity of 843 F g−1 at a current density of 2 A g−1, whereas NiCoFeO showed a specific capacity of only 478 F g−1. This result was attributed to the synergistic effect between NiCoFeO and PANI. The facile synthesis strategy and excellent electrochemical performance suggest that NiCoFeO/PANI is a promising economical electrode material for applications in supercapacitors.

Unprecedented Dual Role of Polyaniline for Enhanced Pseudocapacitance of Cobalt–Iron Layered Double Hydroxide

“…[34,35] The FTIR spectrums of PANI doped LDHs are typical of a layered double hydroxide, [34] and the peak at 3443 cm −1 was attributed to N-H stretching of PANI (Figure S2, Supporting Information). [34,36] The peaks at 1340 and 755 cm −1 were due to the C-N and C-H stretching of the aromatic benzenoid unit. [34,37] Furthermore, these peaks (1340 and 755 cm −1 )can be attributed to CO 3 2− (Figure S3, Supporting Information), owing to the asymmetric stretching vibration of the C-O bond in the interlayer region of LDH.…”

In Situ Synthesis of a Polyaniline/ Fe–Ni Codoped Co3O4 Composite for the Electrode Material of Supercapacitors with Improved Cyclic Stability

“…Because of these remarkable attributes, PANI has been used in supercapacitors intrinsically and with composites of other electrode materials. 16 While, PANI has few drawbacks such as its mass loss with heat, low practical capacitance, and low cyclic stability of charging and discharging. It exhibits many unreactive sites after exposure with electrolyte and causes structural change, which reduces its reactive sites for redox reactions and results in poor super capacitive performances.…”

Preparation of Nitrogen‐doped Silver Phosphate and Its Performance of Supercapacitors

“…[8] The commonly used materials in pseudocapacitors include transition metal oxides, [9,10] transition metal sulfides, [11,12] metal hydroxides, [13,14] conducting polymers, etc. [15,16] In recent years, metal phosphates have been widely used in many industrial fields due to their diverse structures and the ability to provide more dynamic sites. However, in the field of energy storage, metal phosphates have captured attention only in recent years.…”