scholarly journals Lead-free (Ag,K)NbO3 materials for high-performance explosive energy conversion

2020 ◽  
Vol 6 (21) ◽  
pp. eaba0367 ◽  
Author(s):  
Zhen Liu ◽  
Teng Lu ◽  
Fei Xue ◽  
Hengchang Nie ◽  
Ray Withers ◽  
...  
Keyword(s):  
Energy Conversion ◽  
High Performance ◽  
Response Times ◽  
Temperature Stability ◽  
High Energy ◽  
Lead Free ◽  
Explosive Energy ◽  
Mining Areas ◽  
Antiferroelectric Phase ◽  
Underlying Mechanisms

Explosive energy conversion materials with extremely rapid response times have broad and growing applications in energy, medical, defense, and mining areas. Research into the underlying mechanisms and the search for new candidate materials in this field are so limited that environment-unfriendly Pb(Zr,Ti)O3 still dominates after half a century. Here, we report the discovery of a previously undiscovered, lead-free (Ag0.935K0.065)NbO3 material, which possesses a record-high energy storage density of 5.401 J/g, enabling a pulse current ~ 22 A within 1.8 microseconds. It also exhibits excellent temperature stability up to 150°C. Various in situ experimental and theoretical investigations reveal the mechanism underlying this explosive energy conversion can be attributed to a pressure-induced octahedral tilt change from a−a−c+ to a−a−c−/a−a−c+, in accordance with an irreversible pressure-driven ferroelectric-antiferroelectric phase transition. This work provides a high performance alternative to Pb(Zr,Ti)O3 and also guidance for the further development of new materials and devices for explosive energy conversion.

scholarly journals Magnetic Field Energy Harvesting with a Lead-Free Piezoelectric High Energy Conversion Material

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1346
Author(s):  
Quan Wang ◽  
Kyung-Bum Kim ◽  
Sang Bum Woo ◽  
Tae Hyun Sung
Keyword(s):  
Magnetic Field ◽  
Energy Conversion ◽  
High Performance ◽  
High Energy ◽  
Green Energy ◽  
Lead Free ◽  
Field Energy ◽  
Energy Harvesters ◽  
Magnetic Field Energy ◽  
Piezoelectric Energy

This article presents a high-performance lead-free piezoelectric energy harvester (LPEH) system for magnetic field. It based on a Ba0.85Ca0.15Ti0.90Zr0.10O3 + CuO 0.3 wt% (BCTZC0.3) composite was fabricated by sintering at 1450 °C. The BCTZC0.3 composite, which has an enhanced high energy conversion constant (), shows improved piezoelectric power-generation performance when compared with conventional piezoelectric energy harvesters. The BCTZC0.3-based LPEH produces instantaneous maximum power of 8.2 mW and an energy density of 107.9 mW/cm3 in a weak magnetic field of 250 μT. This system can be used to charge a capacitor and operate a wireless sensor network (WSN) system to provide temperature sensing and radio-frequency (RF) transmission in a 250 μT magnetic field. The proposed LPEH is a promising green-energy device for potentially self-powering WSN systems when applied.

scholarly journals Magnetic Field Energy Harvesting with a Lead-Free Piezoelectric High Energy Conversion Material

2021 ◽  
Author(s):  
Tae Hyun Sung ◽  
QUAN WANG ◽  
Kyung Bum Kim ◽  
Sang Bum Woo
Keyword(s):  
Magnetic Field ◽  
Energy Conversion ◽  
High Performance ◽  
Energy Harvester ◽  
High Energy ◽  
Green Energy ◽  
Lead Free ◽  
Field Energy ◽  
Magnetic Field Energy ◽  
Piezoelectric Energy

A high-performance Lead-free Piezoelectric Energy Harvester (LPEH) based on a Ba0.85Ca0.15Ti0.90Zr0.10O3 + CuO 0.3 wt% (BCTZC0.3) composite was fabricated by sintering at 1450℃. The BCTZC0.3 composite, which has an enhanced high-energy-conversion constant (〖d_33×g〗_33), shows improved piezoelectric power-generation performance when compared with conventional piezoelectric energy harvesters. The BCTZC0.3-based LPEH produces instantaneous maximum power of 8.2 mW and an energy density of 107.9 mW/cm3 in a weak magnetic field of 250 μT. This energy harvester can be used to charge a capacitor and operate a wireless sensor network (WSN) system to provide temperature sensing and radio-frequency (RF) transmission in a 250 μT magnetic field. The proposed LPEH is a promising green-energy device for potentially self-powering WSN systems when applied.

Enhanced antiferroelectric phase stability in La-doped AgNbO3: perspectives from the microstructure to energy storage properties

2019 ◽  
Vol 7 (5) ◽  
pp. 2225-2232 ◽  
Author(s):  
Jing Gao ◽  
Yichi Zhang ◽  
Lei Zhao ◽  
Kai-Yang Lee ◽  
Qing Liu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Phase Stability ◽  
High Energy ◽  
High Energy Density ◽  
Lead Free ◽  
Antiferroelectric Phase ◽  
Energy Storage Properties ◽  
La Doped ◽  
Storage Properties

High energy density was achieved in lead-free La-doped AgNbO3 antiferroelectric ceramics.

scholarly journals High energy conversion efficiency conducting polymer actuators based on PEDOT:PSS/MWCNTs composite electrode

RSC Advances ◽  
2017 ◽  
Vol 7 (50) ◽  
pp. 31264-31271 ◽  
Author(s):  
Dongxing Wang ◽  
Chao Lu ◽  
Jingjing Zhao ◽  
Song Han ◽  
Minghong Wu ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Large Deformation ◽  
Conducting Polymer ◽  
Conversion Efficiency ◽  
High Performance ◽  
Composite Electrode ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
High Conversion Efficiency ◽  
High Energy Conversion Efficiency

High performance actuator with large deformation and high conversion efficiency.

Ultrahigh–energy density lead-free dielectric films via polymorphic nanodomain design

Science ◽  
2019 ◽  
Vol 365 (6453) ◽  
pp. 578-582 ◽  
Author(s):  
Hao Pan ◽  
Fei Li ◽  
Yao Liu ◽  
Qinghua Zhang ◽  
Meng Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Functional Materials ◽  
High Energy ◽  
High Energy Density ◽  
Lead Free ◽  
Dielectric Films ◽  
Electronic Systems ◽  
Ultrahigh Energy ◽  
Power Densities

Dielectric capacitors with ultrahigh power densities are fundamental energy storage components in electrical and electronic systems. However, a long-standing challenge is improving their energy densities. We report dielectrics with ultrahigh energy densities designed with polymorphic nanodomains. Guided by phase-field simulations, we conceived and synthesized lead-free BiFeO3-BaTiO3-SrTiO3 solid-solution films to realize the coexistence of rhombohedral and tetragonal nanodomains embedded in a cubic matrix. We obtained minimized hysteresis while maintaining high polarization and achieved a high energy density of 112 joules per cubic centimeter with a high energy efficiency of ~80%. This approach should be generalizable for designing high-performance dielectrics and other functional materials that benefit from nanoscale domain structure manipulation.

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