Duplex printing of all-in-one integrated electronic devices for temperature monitoring

Zhang

et al. 2019

Adv Funct Materials

Self Cite

106

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: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2019

Adv Funct Materials

Self Cite

106

Advanced Energy Materials

“…Meanwhile, benefiting from the high‐mass‐loading electrode architecture, our three‐layered‐electrode based SC readily harvests a high areal energy density of 0.42 mWh cm −2 at an areal capacitance of 8.2 F cm −2 , which compares favorably with the state‐of‐the‐art printed SC systems such as activated wood carbon//MnO 2 @carbon, polyaniline (PANI)//Ti 3 C 2 , PANI//N‐C, Bi 2 O 3 //MnO 2 , MnO 2 //Ti 3 C 2 , Ti 3 C 2 //RuO 2 , reduced graphene oxide (rGO)/multi‐walled carbon nanotube microsphere, Ti 3 C 2 , Exfoliated graphene/MXene, and rGO/MnO 2 (Figure i). Moreover, with the consideration of the compact electrode structure and crumpled morphology, the three‐layered‐electrode device also attains a high volumetric energy density of 0.83 mWh cm −3 , superior to those of recently reported SC systems (Figure S25, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Versatile N‐Doped MXene Ink for Printed Electrochemical Energy Storage Application

Fan

Shao

et al. 2019

366

242

Printing is regarded as a revolutionary and feasible technique to guide the fabrication of versatile functional systems with designed architectures. 2D MXenes are nowadays attractive in printed energy storage devices. However, owing to the van der Waals interaction between the MXene layers, the restacking issues within the printed electrodes can significantly impede the ion/electrolyte transport and hence handicap the electrochemical performances. Herein, a melamine formaldehyde templating method is demonstrated to develop crumpled nitrogen‐doped MXene (MXene‐N) nanosheets. The nitrogen doping boosts the electrochemical performances of MXene via enhanced conductivity and redox activity. Accordingly, two types of MXene‐N inks are prepared throughout the optimization of the ink viscosity to fit the 2D screen printing and 3D extrusion printing, respectively. As a result, the screen printed MXene‐N microsupercapacitor delivers an areal capacitance of 70.1 mF cm−2 and outstanding mechanical robustness. Furthermore, the 3D‐printed MXene‐N based supercapacitor manifests an areal capacitance of 8.2 F cm−2 for a three‐layered electrode and readily stores a high areal energy density of 0.42 mWh cm−2. The approach to harnessing such versatile MXene‐N inks offers distinctive insights into the printed energy storage systems with high areal energy density and large scalability.

“…These works open new avenues for designing a class of 3D‐printable GO‐based composite inks. In addition to GO‐based inks, some other 2 D‐materials‐based inks for 3 D printing have also been intermittently reported, for example, MXene‐based inks . However, their developments still remain in its infancy stage.…”

Section: Ink Printing Technologies: Principles Requirements and Appmentioning

confidence: 99%

Functional Inks for Printable Energy Storage Applications based on 2 D Materials

et al. 2019

Ubiquitous portable electronics and the ever‐growing internet‐of‐things have necessitated the emergence of high‐end miniaturized devices as well as associated sophisticated printing technologies. With excellent solution processability and tunable electronic properties, 2 D materials stand as a promising candidate for functional inks that are readily printable for energy‐storage devices. In this Review, we outline the significance, status, and challenges that we are facing of the developments of 2 D materials‐based functional inks. Then, general ink formulation and basic knowledge of printing techniques together with their rheological requirements and enabled applications in energy storage are introduced, providing guidelines for developing inks that match well with the present printing techniques. Last, but not least, we also propose the perspectives on the development of 2 D materials‐based inks for energy‐storage applications.