Polypyrrole-coated copper@graphene core-shell nanoparticles for supercapacitor application

Abstract

The performance of supercapacitors strongly depends on the electrochemical characterizations of electrode materials. Herein, a composite material consisted of polypyrrole (PPy) and multilayer graphene-wrapped copper nanoparticles (PPy/MLG-Cu NPs) is fabricated on a flexible carbon cloth (CC) substrate via two-step synthesis process for supercapacitor application. Where, MLG-Cu NPs are prepared on CC by one-step chemical vapor deposition (CVD) synthesis approach; thereafter, the PPy is further deposited on the MLG-Cu NPs/CC via electropolymerization. The related material characterizations of PPy/MLG-Cu NPs are well investigated by scanning electron microscopic (SEM), high resolution transmission electron microscopy (HR–TEM), Raman spectrometer and X-ray photoelectron spectroscopy (XPS); the electrochemical behaviors of the pertinent electrodes are studied by cyclic voltammogram (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) measurements. The flexible electrode with PPy/MLG-Cu NPs composites exhibits the best specific capacitance of 845.38 F g-1 at 1 A g-1, which is much higher than those of electrodes with PPy (214.30 F g-1), MLG-Cu NPs (6.34 F g-1), multilayer graphene hollow balls (MLGHBs; 52.72 F g-1), and PPy/MLGHBs (237.84 F g-1). Finally, a supercapacitor system consisted of four PPy/MLG-Cu NPs/CC electrodes can efficiently power various light-emitting diodes (i.e., red, yellow, green, and blue lighs), demonstrating the practical application of PPy/MLG-Cu NPs/CC electrode.

Tailoring the ion storage of MXene by aramid nanofibers towards self-standing electrodes for flexible solid-state supercapacitors

“…The development of advanced two-dimensional (2D) nanomaterials has attracted great interest in energy storage filed, due to their unique structure for ion storage [14]. Among the emerging 2D nanomaterials, 2D transition metal carbides and nitrides (MXenes) have emerged as the latest additions to the family of 2D inorganic nanomaterials and exhibit excellent performance in a wide range of applications, such as supercapacitors [15,16], batteries [17][18][19] and energy conversion [20]. MXene presents attractive physicochemical properties including ultrahigh electronic conductivity [21], good processability [22], and abundant hydrophilic surface groups [23].…”

Laser‐Induced Electron Synchronization Excitation for Photochemical Synthesis and Patterning Graphene‐Based Electrode

“…Currently, several established methods for MSC fabrication, including electrodeposition, wet chemical synthesis, chemical vapor deposition, and so on. [23][24][25][26][27] Nevertheless, for microdevices requiring high resolution, these methods face challenges in achieving high-quality patterning and selective control over material synthesis. LDW offers distinct advantages as a one-step, straightforward, and efficient method, facilitating the patterning of MSC electrodes in various shapes while concurrently synthesizing hybrid electrode materials.…”

Editorial for focus on manipulations of atomic and molecular layers and its applications in energy, environment sciences and optoelectronic devices

“…In addition to these ALD efforts, in this Focus, there are also 5 studies relying on wet chemistry, CVD, and other techniques. Among them, two studies studied supercapacitors [18,19]. To develop flexible Fe 2 O 3 -based supercapacitors, Cu nanoparticles (NPs) wrapped a conductive multi-layer graphene (MLG) were fabricated on top of the CC using a CVD method, while the pseudocapacitive γ-Fe 2 O 3 was fabricated using a successive ionic layer adsorption and reaction (SILAR) method at a low temperature.…”

“…This study demonstrates that the γ-Fe 2 O 3 is a promising material used in the energy-storage technology. In another study, Ho et al [19] developed a polypyrrole (PPy)-based flexible supercapacitor, in which PPy was fabricated using an electropolymerization method at room temperatures. Particularly, this study revealed that PPy can be used to replace Fe 2 O 3 as the pseudocapacitive layer and thereby largely decrease the fabrication cost.…”