Morphology‐dependent electrochemical performance of nitrogen‐doped carbon dots@polyaniline hybrids for supercapacitors

Abstract

Summary In this work, the binary N‐CDs@PANI hybrids were fabricated by introducing zero‐dimensional nitrogen‐doped carbon dots (N‐CDs) into reticulated PANI. Firstly, N‐CDs were prepared by one‐pot microwave method, and then, the N‐CDs were introduced into in situ oxidative polymerization of aniline (ANI) monomer. The N‐CDs with abundant functional groups and high electronic cloud density played a significant role in guiding the polyaniline‐ordered growth into intriguing morphologies. Moreover, morphology‐dependent electrochemical performances of N‐CDs@PANI hybrids were investigated and N‐CDs improve static interaction and enhance the special capacitances in the N‐CDs@PANI hybrids. Especially, the specific capacitance of PC4 hybrid can reach 785 F g−1, which exceed that of pure PANI (274 F g−1) at current density of 0.5 A g−1 according to three‐electrode measurement. And the capacitance retention of the PC4 hybrid still keeps 70% after 2000 cycles of charge and discharge. The N‐CDs@PANI hybrids can have potential applications in electrode materials, supercapacitors, nonlinear optics, and microwave absorption.

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

“…23 Currently, the most widely used electrode materials in EDLCs are activated carbons (ACs), which generally possess high surface area, good electric conductivity, and excellent long-term cycling stability. 22,[24][25][26] Heteroatoms doping [27][28][29][30][31] or co-doping [32][33][34][35] can effectively improve the energy storage of ACs, and the dependence of the chargestorage capability of ACs on the surface area of ACs has stimulated the interest to fabricate porous ACs to increase specific adsorption sites. 5 However, the topology of ACs is another important factor likely controlling the migration of electrolyte ions during electrochemical cycling.…”

In‐situ formation and intercalation of carbon dots induced high‐yield 1T‐molybdenum disulfide as electrode materials

“…The NMR spectra and FTIR spectra identify the surface chemical groups on as‐obtained CDs shown in Figure S1. These active functional groups on the surface of CDs would improve the hydrophilicity of CDs, which is helpful for promoting the contact between the electrode material and the electrolyte . As‐synthesized CDs with a lattice spacing of 0.215 nm and the average diameter is around 7 to 12 nm.…”

Polyaniline‐Acetylene black‐Copper cobaltite based ternary hybrid material with enhanced electrochemical properties and its use in supercapacitor electrodes

“…45 Zhaofen et al has reported a specific capacitance of 160.5 F/g for aniline-grafting graphene oxide/PANI (GO-ANI/PANI) composite. 47 We have taken acetylene black as a carbon source to reduce the cost and prepared a new ternary composite (polyaniline-acetylene blackcopper cobaltite). 47 We have taken acetylene black as a carbon source to reduce the cost and prepared a new ternary composite (polyaniline-acetylene blackcopper cobaltite).…”

“…46 Recently, Fei et al has prepared nitrogen-doped carbon dots@polyaniline hybrids, and the reported specific capacitance value is 785 F/g. 47 We have taken acetylene black as a carbon source to reduce the cost and prepared a new ternary composite (polyaniline-acetylene blackcopper cobaltite).…”