4 research outputs found
Ultrathin Coaxial Fiber Supercapacitors Achieving High Energy and Power Densities
Fiber-based supercapacitors
have attracted significant interests because of their potential applications
in wearable electronics. Although much progress has been made in recent
years, the energy and power densities, mechanical strength, and flexibility
of such devices are still in need of improvement for practical applications.
Here, we demonstrate an ultrathin microcoaxial fiber supercapacitor
(μCFSC) with high energy and power densities (2.7 mW h/cm<sup>3</sup> and 13 W/cm<sup>3</sup>), as well as excellent mechanical
properties. The prototype with the smallest reported overall diameter
(∼13 μm) is fabricated by successive coating of functional
layers onto a single micro-carbon-fiber via a scalable process. Combining
the simulation results via the electrochemical model, we attribute
the high performance to the well-controlled thin coatings that make
full use of the electrode materials and minimize the ion transport
path between electrodes. Moreover, the μCFSC features high bending
flexibility and large tensile strength (more than 1 GPa), which make
it promising as a building block for various flexible energy storage
applications
High-Voltage Flexible Microsupercapacitors Based on Laser-Induced Graphene
High-voltage energy-storage
devices are quite commonly needed for
robots and dielectric elastomers. This paper presents a flexible high-voltage
microsupercapacitor (MSC) with a planar in-series architecture for
the first time based on laser-induced graphene. The high-voltage devices
are capable of supplying output voltages ranging from a few to thousands
of volts. The measured capacitances for the 1, 3, and 6 V MSCs were
60.5, 20.7, and 10.0 μF, respectively, under an applied current
of 1.0 μA. After the 5000-cycle charge–discharge test,
the 6 V MSC retained about 97.8% of the initial capacitance. It also
was recorded that the all-solid-state 209 V MSC could achieve a high
capacitance of 0.43 μF at a low applied current of 0.2 μA
and a capacitance of 0.18 μF even at a high applied current
of 5.0 μA. We further demonstrate the robust function of our
flexible high-voltage MSCs by using them to power a piezoresistive
microsensor (6 V) and a walking robot (>2000 V). Considering the
simple,
direct, and cost-effective fabrication method of our laser-fabricated
flexible high-voltage MSCs, this work paves the way and lays the foundation
for high-voltage energy-storage devices
High-Voltage Flexible Microsupercapacitors Based on Laser-Induced Graphene
High-voltage energy-storage
devices are quite commonly needed for
robots and dielectric elastomers. This paper presents a flexible high-voltage
microsupercapacitor (MSC) with a planar in-series architecture for
the first time based on laser-induced graphene. The high-voltage devices
are capable of supplying output voltages ranging from a few to thousands
of volts. The measured capacitances for the 1, 3, and 6 V MSCs were
60.5, 20.7, and 10.0 μF, respectively, under an applied current
of 1.0 μA. After the 5000-cycle charge–discharge test,
the 6 V MSC retained about 97.8% of the initial capacitance. It also
was recorded that the all-solid-state 209 V MSC could achieve a high
capacitance of 0.43 μF at a low applied current of 0.2 μA
and a capacitance of 0.18 μF even at a high applied current
of 5.0 μA. We further demonstrate the robust function of our
flexible high-voltage MSCs by using them to power a piezoresistive
microsensor (6 V) and a walking robot (>2000 V). Considering the
simple,
direct, and cost-effective fabrication method of our laser-fabricated
flexible high-voltage MSCs, this work paves the way and lays the foundation
for high-voltage energy-storage devices
High-Voltage Flexible Microsupercapacitors Based on Laser-Induced Graphene
High-voltage energy-storage
devices are quite commonly needed for
robots and dielectric elastomers. This paper presents a flexible high-voltage
microsupercapacitor (MSC) with a planar in-series architecture for
the first time based on laser-induced graphene. The high-voltage devices
are capable of supplying output voltages ranging from a few to thousands
of volts. The measured capacitances for the 1, 3, and 6 V MSCs were
60.5, 20.7, and 10.0 μF, respectively, under an applied current
of 1.0 μA. After the 5000-cycle charge–discharge test,
the 6 V MSC retained about 97.8% of the initial capacitance. It also
was recorded that the all-solid-state 209 V MSC could achieve a high
capacitance of 0.43 μF at a low applied current of 0.2 μA
and a capacitance of 0.18 μF even at a high applied current
of 5.0 μA. We further demonstrate the robust function of our
flexible high-voltage MSCs by using them to power a piezoresistive
microsensor (6 V) and a walking robot (>2000 V). Considering the
simple,
direct, and cost-effective fabrication method of our laser-fabricated
flexible high-voltage MSCs, this work paves the way and lays the foundation
for high-voltage energy-storage devices