High performance flexible solid-state symmetric supercapacitors based on laser induced porous reduced graphene oxide-graphene oxide hybrid nanostructure devices
TL;DR: In this paper, an effective method is introduced to achieve a large-scale production of porous graphene network by laser irradiation of graphene oxide films with a short span of time, which introduces a porous structure, high surface area and promising electrochemical properties.
About: This article is published in Applied Surface Science.The article was published on 2019-06-30. It has received 22 citations till now. The article focuses on the topics: Graphene & Capacitance.
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TL;DR: In this article, a 2D carbon nanotube and 2D graphene material have been used for the first time in the development of material science, and they have played significant roles in our daily life and the development in material science.
Abstract: Carbon materials, with their diverse allotropes, have played significant roles in our daily life and the development of material science. Following 0D C60 and 1D carbon nanotube, 2D graphene materi...
235 citations
TL;DR: In this paper, the principles of direct laser writing of graphene, according to the different types of raw materials, different type of lasers, and different applications, are classified and the future directions of laser synthesized graphene are discussed.
Abstract: Direct laser writing of graphene electrodes is an emerging research field for the rapid fabrication of two-dimensional carbon electronic materials with wide applications, ranging from supercapacitors and batteries to sensors, electrocatalysts, actuators, etc. Many types of carbon-containing raw materials can be converted to graphene by one-step laser scribing, without complicated chemical synthesis routines, using a variety of lasers. This perspective categorizes the principles of direct laser writing of graphene, according to the different types of raw materials, different types of lasers, and different applications. The future directions of laser synthesized graphene are also discussed.
60 citations
TL;DR: In this paper, a review of facile laser direct writing methods for graphene was firstly summarized and then applied for electrochemical double-layer capacitors, pseudo-capacitors and hybrid supercapacitor.
Abstract: Supercapacitors, with the merits of both capacitors for safe and fast charge and batteries for high energy storage have drawn tremendous attention. Recently, laser scribed graphene has been increasingly studied for supercapacitor applications due to its unique properties, such as flexible fabrication, large surface area and high electrical conductivity. With the laser direct writing process, graphene can be directly fabricated and patterned as the supercapacitor electrodes. In this review, facile laser direct writing methods for graphene were firstly summarized. Various precursors, mainly graphene oxide and polyimide were employed for laser scribed graphene and the modifications of graphene properties were also discussed. This laser scribed graphene was applied for electrochemical double-layer capacitors, pseudo-capacitors and hybrid supercapacitors. Diverse strategies including doping, composite materials and pattern design were utilized to enhance the electrochemical performances of supercapacitors. Featured supercapacitors with excellent flexible, ultrafinestructured and integrated functions were also reviewed.
38 citations
TL;DR: In this article, a unique bowl-shaped graphene/polypyrrole (PPy) nanostructure is uniformly grown on a graphite substrate by two facile electrochemical steps.
35 citations
TL;DR: In this article, the authors proposed a high performance supercapacitor with thermal and electrochemical activation treatment, which shows high performance for high-performance supercapACitor application.
Abstract: Carbon fiber (CF) sequentially undergoes thermal activation (TCF), electrochemical oxidation activation (EOTCF), electrochemical reduction activation (EROTCF) and a secondary thermal activation process to form a highly activated CF (TEROTCF) electrode material. EOTCF undergoes a thermal activation process to form TEOTCF. EROTCF, TEOTCF and TEROTCF show specific capacitance values of 1455, 1438 and 1426 mF cm−2 at 1 mA cm−2 and capacitance retention values of 0.97%, 35.62%, and 59.61% when the current density increases from 1 to 20 mA cm−2. EROTCF, TEOTCF and TEROTCF show similar capacitance values, but much superior to CF (709 mF cm−2). TEROTCF shows much higher rate capability than EROTCF and TEOTCF. Carbonyl, epoxy and hydroxyl groups are introduced on the TCF by electrochemical oxidation activation. Carbonyl groups existing at the edge of the basal plane contribute towards improving the specific capacitance of CF. Hydroxyl and epoxy groups on the basal plane of the carbon skeleton lead to the destruction of the conjugated system. The electrochemical reduction and secondary thermal activation cause the removal of the non-electroactive epoxy and hydroxyl groups for recovering the sp2 structure, accordingly enhancing the rate capability of CF. All-solid-state flexible supercapacitors using two TEROTCF electrodes achieve 26.0 μW h cm−2 at 125.0 μW cm−2 and good cycling performance. So, CF with thermal and electrochemical activation treatment shows highly enhanced capacitance for high-performance supercapacitor application.
27 citations
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26,456 citations
TL;DR: It is shown that graphite oxide sheets can be converted by infrared laser irradiation into porous graphene sheets that are flexible, robust, and highly conductive, and hold promise for high-power, flexible electronics.
Abstract: Although electrochemical capacitors (ECs), also known as supercapacitors or ultracapacitors, charge and discharge faster than batteries, they are still limited by low energy densities and slow rate capabilities. We used a standard LightScribe DVD optical drive to do the direct laser reduction of graphite oxide films to graphene. The produced films are mechanically robust, show high electrical conductivity (1738 siemens per meter) and specific surface area (1520 square meters per gram), and can thus be used directly as EC electrodes without the need for binders or current collectors, as is the case for conventional ECs. Devices made with these electrodes exhibit ultrahigh energy density values in different electrolytes while maintaining the high power density and excellent cycle stability of ECs. Moreover, these ECs maintain excellent electrochemical attributes under high mechanical stress and thus hold promise for high-power, flexible electronics.
3,603 citations
TL;DR: The latest progress in supercapacitors in charge storage mechanisms, electrode materials, electrolyte materials, systems, characterization methods, and applications are reviewed and the newly developed charge storage mechanism for intercalative pseudocapacitive behaviour is clarified for comparison.
Abstract: Electrochemical capacitors (i.e. supercapacitors) include electrochemical double-layer capacitors that depend on the charge storage of ion adsorption and pseudo-capacitors that are based on charge storage involving fast surface redox reactions. The energy storage capacities of supercapacitors are several orders of magnitude higher than those of conventional dielectric capacitors, but are much lower than those of secondary batteries. They typically have high power density, long cyclic stability and high safety, and thus can be considered as an alternative or complement to rechargeable batteries in applications that require high power delivery or fast energy harvesting. This article reviews the latest progress in supercapacitors in charge storage mechanisms, electrode materials, electrolyte materials, systems, characterization methods, and applications. In particular, the newly developed charge storage mechanism for intercalative pseudocapacitive behaviour, which bridges the gap between battery behaviour and conventional pseudocapacitive behaviour, is also clarified for comparison. Finally, the prospects and challenges associated with supercapacitors in practical applications are also discussed.
2,698 citations
TL;DR: The results strongly indicate that the long-standing puzzle about the interfacial capacitance in carbon-based electrodes has a quantum origin, and suggest that charged impurities also influences the quantum capacitance.
Abstract: Graphene has received widespread attention due to its unique electronic properties. Much of the research conducted so far has focused on electron mobility, which is determined by scattering from charged impurities and other inhomogeneities. However, another important quantity, the quantum capacitance, has been largely overlooked. Here, we report a direct measurement of the quantum capacitance of graphene as a function of gate potential using a three-electrode electrochemical configuration. The quantum capacitance has a non-zero minimum at the Dirac point and a linear increase on both sides of the minimum with relatively small slopes. Our findings -- which are not predicted by theory for ideal graphene -- suggest that charged impurities also influences the quantum capacitance. We also measured the capacitance in aqueous solutions at different ionic concentrations, and our results strongly indicate that the long-standing puzzle about the interfacial capacitance in carbon-based electrodes has a quantum origin.
1,492 citations
TL;DR: In this article, the formation of different types of oxygen containing functional groups in GO and their influences on its structure were analyzed using X-ray diffraction (XRD), Fourier transform infra-red spectra, x-ray photoelectron spectra (XPS), zeta potential analysis and Raman spectroscopy.
1,428 citations