8 research outputs found
Wearable Triboelectric Generator for Powering the Portable Electronic Devices
A cloth-base
wearable triboelectric nanogenerator made of nylon
and Dacron fabric was fabricated for harvesting body motion energy.
Through the friction between forearm and human body, the generator
can turn the mechanical energy of an arm swing into electric energy
and power an electroluminescent tubelike lamp easily. The maximum
output current and voltage of the generator reach up to 0.2 mA and
2 kV. Furthermore, this generator can be easily folded, kneaded, and
cleaned like a common garment
Magnetic Force Driven Nanogenerators as a Noncontact Energy Harvester and Sensor
Nanogenerator has been a very important energy harvesting
technology
through directly deforming piezoelectric material. Here, we report
a new magnetic force driven contactless nanogenerator (CLNG), which
avoids the direct contact between nanogenerator and mechanical movement
source. The CLNG can harvest the mechanical movement energy in a noncontact
mode to generate electricity. Their output voltage and current can
be as large as 3.2 V and 50 nA, respectively, which is large enough
to power up a liquid crystal display. We also demonstrate a means
by which a magnetic sensor can be built
Magnetic Force Driven Nanogenerators as a Noncontact Energy Harvester and Sensor
Nanogenerator has been a very important energy harvesting
technology
through directly deforming piezoelectric material. Here, we report
a new magnetic force driven contactless nanogenerator (CLNG), which
avoids the direct contact between nanogenerator and mechanical movement
source. The CLNG can harvest the mechanical movement energy in a noncontact
mode to generate electricity. Their output voltage and current can
be as large as 3.2 V and 50 nA, respectively, which is large enough
to power up a liquid crystal display. We also demonstrate a means
by which a magnetic sensor can be built
Hierarchical Wrinkles with Piezopotential Enhanced Surface Tribopolarity for High-Performance Self-Powered Pressure Sensor
Achieving
both high sensitivity and wide detecting range is significant
for the applications of triboelectric nanogenerator-based self-powered
pressure sensors (TPSs). However, most of the previous designs with
high sensitivity usually struggle in a narrow pressure detection range
(<30 kPa) while expanding the detection range normally sacrifices
the sensitivity. To overcome this well-known obstacle, herein, piezopotential
enhanced triboelectric effect realized by a rationally designed PDMS/ZnO
NWs hierarchical wrinkle structure was exploited to develop a TPS
(PETPS) with both high sensitivity and wide detecting range. In this
PETPS design, the piezopotential derived from the deformation of ZnO
NWs enhances its tribo-charge transferring ability; meanwhile, the
hierarchical structure helps to establish a dynamically self-adjustable
contact area. Benefiting from these advantages, the PETPS simultaneously
achieves high sensitivity (0.26 nC cm–2 kPa–1 from 1 to 25 kPa, and 0.02 nC cm–2 kPa–1 from 25 to 476 kPa), fast response (46 ms),
wide sensing range (1 to 476 kPa), and good stability (over 4000 cycles).
In addition, the output charge density that is independent of the
speed rate of driven force was adopted as the sensing signal of PETPS
to replace the commonly used peak voltage/current values, enabling
it more adaptive to accurately detect pressure variation in real applications
Dynamic Behavior of the Triboelectric Charges and Structural Optimization of the Friction Layer for a Triboelectric Nanogenerator
Seeking
to increase the triboelectric charge density on a friction layer is
one of the most basic approaches to improve the output performance
of triboelectric nanogenerators (TENGs). Here, we studied the storage
mechanism of triboelectric charge in the friction layer and discussed
the function of carrier mobility and concentration in the charge-storing
process. As guided by these results, a kind of composite structure
is constructed in the friction layer to adjust the depth distribution
of the triboelectric charges and improve the output performance of
TENGs. To further elucidate this theory, a simple TENG, whose negative
friction layer is a composite structure by integrating polystyrene
(PS) and carbon nanotubes (CNTs) into polyvinylidene fluoride (PVDF),
was fabricated, and its performance test was also carried out. Comparing
with a pure PVDF friction layer, the composite friction layer can
raise the triboelectric charge density by a factor of 11.2. The extended
residence time of electrons in the friction layer is attributed to
a large sum of electron trap levels from PS
Hierarchical Wrinkles with Piezopotential Enhanced Surface Tribopolarity for High-Performance Self-Powered Pressure Sensor
Achieving
both high sensitivity and wide detecting range is significant
for the applications of triboelectric nanogenerator-based self-powered
pressure sensors (TPSs). However, most of the previous designs with
high sensitivity usually struggle in a narrow pressure detection range
(<30 kPa) while expanding the detection range normally sacrifices
the sensitivity. To overcome this well-known obstacle, herein, piezopotential
enhanced triboelectric effect realized by a rationally designed PDMS/ZnO
NWs hierarchical wrinkle structure was exploited to develop a TPS
(PETPS) with both high sensitivity and wide detecting range. In this
PETPS design, the piezopotential derived from the deformation of ZnO
NWs enhances its tribo-charge transferring ability; meanwhile, the
hierarchical structure helps to establish a dynamically self-adjustable
contact area. Benefiting from these advantages, the PETPS simultaneously
achieves high sensitivity (0.26 nC cm–2 kPa–1 from 1 to 25 kPa, and 0.02 nC cm–2 kPa–1 from 25 to 476 kPa), fast response (46 ms),
wide sensing range (1 to 476 kPa), and good stability (over 4000 cycles).
In addition, the output charge density that is independent of the
speed rate of driven force was adopted as the sensing signal of PETPS
to replace the commonly used peak voltage/current values, enabling
it more adaptive to accurately detect pressure variation in real applications
Flexible Fiber Nanogenerator with 209 V Output Voltage Directly Powers a Light-Emitting Diode
On the basis of a vertically aligned ultralong PbÂ(Zr<sub>0.52</sub>Ti<sub>0.48</sub>)ÂO<sub>3</sub> (PZT) nanowire array fabricated
using
electrospinning nanofibers, we developed a new type of integrated
nanogenerator (NG) with ultrahigh output voltage of 209 V and current
density of 23.5 μA/cm<sup>2</sup>, which are 3.6 times and 2.9
times of the previous record values, respectively. The output electricity
can be directly used to stimulate the frog’s sciatic nerve
and to induce a contraction of a frog’s gastrocnemius. The
NG can instantaneously power a commercial light-emitting diode (LED)
without the energy storage process
Flexible Fiber Nanogenerator with 209 V Output Voltage Directly Powers a Light-Emitting Diode
On the basis of a vertically aligned ultralong PbÂ(Zr<sub>0.52</sub>Ti<sub>0.48</sub>)ÂO<sub>3</sub> (PZT) nanowire array fabricated
using
electrospinning nanofibers, we developed a new type of integrated
nanogenerator (NG) with ultrahigh output voltage of 209 V and current
density of 23.5 μA/cm<sup>2</sup>, which are 3.6 times and 2.9
times of the previous record values, respectively. The output electricity
can be directly used to stimulate the frog’s sciatic nerve
and to induce a contraction of a frog’s gastrocnemius. The
NG can instantaneously power a commercial light-emitting diode (LED)
without the energy storage process