Printing assembly and structural regulation of graphene towards three-dimensional flexible micro-supercapacitors

Zhang

et al. 2019

Adv Funct Materials

103

3D printing graphene aerogel with periodic microlattices has great prospects for various practical applications due to their low density, large surface area, high porosity, excellent electrical conductivity, good elasticity, and designed lattice structures. However, the low specific capacitance limits their development in energy storage fields due to the stacking of graphene. Therefore, constructing a graphene‐based 2D materials hybridization aerogel that consists of the pseduocapacitive substance and graphene material is necessary for enhancing electrochemical performance. Herein, 3D printing periodic graphene‐based composite hybrid aerogel microlattices (HAMs) are reported via 3D printing direct ink writing technology. The rich porous structure, high electrical conductivity, and highly interconnected networks of the HAMs aid electron and ion transport, further enabling excellent capacitive performance for supercapacitors. An asymmetric supercapacitor device is assembled by two different 4‐mm‐thick electrodes, which can yield high gravimetric specific capacitance (Cg) of 149.71 F g−1 at a current density of 0.5 A g−1 and gravimetric energy density (Eg) of 52.64 Wh kg−1, and retains a capacitance retention of 95.5% after 10 000 cycles. This work provides a general strategy for designing the graphene‐based mixed‐dimensional hybrid architectures, which can be utilized in energy storage fields.

Section: Resultssupporting

confidence: 72%

Direct Ink Writing of Adjustable Electrochemical Energy Storage Device with High Gravimetric Energy Densities

Zhang

et al. 2019

Adv Funct Materials

103

“…[ 172 ] This technology offers many advantages in the fabrication of composites, including high geometric accuracy, cost‐effectiveness. As shown in Figure a, Li et al [ 173 ] fabricated the GO ink to generate a 3D object through layer‐by‐layer printed. The macroporous graphene foam is obtained by freeze‐drying, followed by in situ chemical reduction.…”

Section: Fabrication Methodsmentioning

confidence: 99%

Section: Fabrication Methodsmentioning

confidence: 99%

Recent Developments of Planar Micro‐Supercapacitors: Fabrication, Properties, and Applications

Zhang

Zhou

et al. 2020

Adv Funct Materials

The increasing development of wearable, portable, implantable, and highly integrated electronic devices has led to an increasing demand for miniaturization of energy storage devices. In recent years, supercapacitors, as an energy storage device, have received enormous attention owing to their excellent properties of quick charge and discharge, high power density, and long life cycle with minimal maintenance. Micro-supercapacitors (MSCs) as a promising candidate for miniaturized energy storage components have undergone considerable theoretical and experimental investigations. Particularly, planar MSCs with a 2D architecture design have more attractive application prospects due to their flexible design and excellent electrochemical performance. However, the major drawbacks of MSCs are their intrinsically low energy density. For this reason, researchers have conducted much investigation to improve their energy density in order to promote their practical application. Herein, the recent development and progress of planar MSCs from the scope of the substrates, electrode materials, fabrication methods, electrochemical properties, and applications are discussed. Finally, the currently existing challenges and developments associated with planar MSCs are also discussed. All in all, planar MSCs have great application potential in various fields of electrochemical energy storage, self-powered wireless sensors, and stimuli-responsive and photoresponsive, alternating current line filtering.

Advanced Sustainable Systems

“…Moreover, the new emerging materials such as 2D MXenes, LDH, and other 3D materials can be used as hierarchical structure templates to synthesize the multidimensional nanostructure carbon materials. [153,154] Furthermore, the nanostructure carbon materials could be prepared by the new synthetic technology such as aerosol spray [155][156][157][158][159] and 3D printing technology, [160][161][162][163][164] which are simple, cost-effective and shows incredible versatility for materials processing with diverse nanostructures and unique properties. All in all, the power and energy densities need to be further improved and these designed novel nanostructure carbon materials would promote a new generation of supercapacitors with outstanding electrochemical performance in the near future.…”

Section: Discussionmentioning

confidence: 99%

Progress of Nanostructured Electrode Materials for Supercapacitors

Jiang

Yadi

Nie

et al. 2017

106

Supercapacitors, as a type of energy storage system, bridge the power/energy gap between conventional capacitors and batteries due to attractive properties such as high power density, long cycle lifespan, and large temperature range. However, the low energy density of supercapacitors compared to lithium‐ion batteries has hindered their general application. In general, the electrochemical performance of supercapacitors is closely related to the structure of their electrode materials, electrolytes, and device design. The main materials used in electrochemical double‐layer capacitors (EDLCs) are carbon materials with various architectures. This is due to their high surface area, good electric conductivity, and intrinsic stability. In this review, recently reported carbon‐based nanostructured electrode materials with 0D, 1D, 2D, and 3D structures are systematically reviewed. The effect of nanostructuring on the properties of supercapacitors including specific capacitance, rate capability, and cycle stability is explored, the details of which may serve as a guide to electrode design for the next generation of EDLCs.