3D Printing Fiber Electrodes for an All‐Fiber Integrated Electronic Device via Hybridization of an Asymmetric Supercapacitor and a Temperature Sensor

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

“…[261][262][263] For example, pulse and heart rate can be deduced by measuring the pressure on the blood vessel, and body movements can be tracked by measuring the strain at joints. [261][262][263] For example, pulse and heart rate can be deduced by measuring the pressure on the blood vessel, and body movements can be tracked by measuring the strain at joints.…”

Section: Sensing Of Physical Parametersmentioning

confidence: 99%

“…[263] The integrated device detected the temperature in a wide range from 30 to 80 °C with a high sensitivity of 1.95% °C −1 . [263] The integrated device detected the temperature in a wide range from 30 to 80 °C with a high sensitivity of 1.95% °C −1 .…”

Section: Sensing Of Physical Parametersmentioning

confidence: 99%

Stretchable Supercapacitors as Emergent Energy Storage Units for Health Monitoring Bioelectronics

Chen

Villa

Zhuang

et al. 2019

109

Emerging health monitoring bioelectronics require energy storage units with improved stretchability, biocompatibility, and self‐charging capability. Stretchable supercapacitors hold great potential for such systems due to their superior specific capacitances, power densities, and tissue‐conforming properties, as compared to both batteries and conventional capacitors. Despite the rapid progress that has been made in supercapacitor research, practical applications in health monitoring bioelectronics have yet to be achieved, requiring innovations in materials, device configurations, and fabrications tailored for such applications. In this review, the progress in stretchable supercapacitor‐powered health monitoring bioelectronics is summarized and the required specifications of supercapacitors for different types of application settings with varying demands on biocompatibility are discussed, including nontouching wearables, skin‐touching wearables, skin‐conforming wearables, and implantables. The perspective of this review is then broadened to focus on integration of stretchable supercapacitors in bioelectronics and aspects of energy harvesting and sensing. Finally further insights on the existing challenges in this developing field and potential solutions are provided.

“…[ 13–15 ] So far, most integrated systems are assembled with serial devices based on multiple mono‐functional materials. [ 7,9,16–18 ] For instance, a MSC‐gas sensor integrated system was reported, based on polyaniline‐wrapped carbon nanotube MSC as energy storage unit and graphene gas sensor as energy consumption device. [ 9 ] However, the complicated preparation of various mono‐functional active materials for single‐function energy‐related units, and poor compatibility of multiple energy modules involving complex connections, substantially increase the difficulty in the efficient construction of the integrated systems.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Ordered Dual‐Mesoporous Polypyrrole/Graphene Nanosheets as Bi‐Functional Active Materials for High‐Performance Planar Integrated System of Micro‐Supercapacitor and Gas Sensor

Qin

Gao

Shi

et al. 2020

Adv Funct Materials

128

(1 of 9)Planar integrated systems of micro-supercapacitors (MSCs) and sensors are of profound importance for 3C electronics, but usually appear poor in compatibility due to the complex connections of device units with multiple mono-functional materials. Herein, 2D hierarchical ordered dual-mesoporous polypyrrole/graphene (DM-PG) nanosheets are developed as bi-functional active materials for a novel prototype planar integrated system of MSC and NH 3 sensor. Owing to effective coupling of conductive graphene and highsensitive pseudocapacitive polypyrrole, well-defined dual-mesopores of ≈7 and ≈18 nm, hierarchical mesoporous network, and large surface area of 112 m 2 g −1 , the resultant DM-PG nanosheets exhibit extraordinary sensing response to NH 3 as low as 200 ppb, exceptional selectivity toward NH 3 that is much higher than other volatile organic compounds, and outstanding capacitance of 376 F g −1 at 1 mV s −1 for supercapacitors, simultaneously surpassing single-mesoporous and non-mesoporous counterparts. Importantly, the bi-functional DM-PG-based MSC-sensor integrated system represents rapid and stable response exposed to 10-40 ppm of NH 3 after only charging for 100 s, remarkable sensitivity of NH 3 detection that is close to DM-PG-based MSC-free sensor, impressive flexibility with ≈82% of initial response value even at 180°, and enhanced overall compatibility, thereby holding great promise for ultrathin, miniaturized, body-attachable, and portable detection of NH 3 .