Sodium‐potassium niobate nanorods with various crystal structures and their application to nanogenerator

Xu, Hongmei; Lee, Tae Gon; Park, Su Jin; Kim, Bo Yun; Nahm, Sahn

doi:10.1111/jace.14664

Cited by 11 publications

(4 citation statements)

References 38 publications

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“…HaiBo et al (2017) found that polymorphic phase sodium-potassium niobate (NKN) nanorods have the most significant piezoelectric strain constant (175 pm/V) as they have more directions for dipole rotation than the nanogenerators with rhombohedral or orthorhombic nanorods [45]. Their experiment, using 0.7 g of PP (polymorphic phase) NKN nanorods, showed a maximum open-circuit voltage of 35 V and a short circuit current of 5.0 at a strain of 2.13% and an average strain rate of 3.7% s −1 .…”

Section: Nanogenerators Based On Piezoelectric Effectmentioning

confidence: 99%

Nanogenerators as a Sustainable Power Source: State of Art, Applications, and Challenges

et al. 2019

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A sustainable power source to meet the needs of energy requirement is very much essential in modern society as the conventional sources are depleting. Bioenergy, hydropower, solar, and wind are some of the well-established renewable energy sources that help to attain the need for energy at mega to gigawatts power scale. Nanogenerators based on nano energy are the growing technology that facilitate self-powered systems, sensors, and flexible and portable electronics in the booming era of IoT (Internet of Things). The nanogenerators can harvest small-scale energy from the ambient nature and surroundings for efficient utilization. The nanogenerators were based on piezo, tribo, and pyroelectric effect, and the first of its kind was developed in the year 2006 by Wang et al. The invention of nanogenerators is a breakthrough in the field of ambient energy-harvesting techniques as they are lightweight, easily fabricated, sustainable, and care-free systems. In this paper, a comprehensive review on fundamentals, performance, recent developments, and application of nanogenerators in self-powered sensors, wind energy harvesting, blue energy harvesting, and its integration with solar photovoltaics are discussed. Finally, the outlook and challenges in the growth of this technology are also outlined.

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Section: Nanogenerators Based On Piezoelectric Effectmentioning

confidence: 99%

Nanogenerators as a Sustainable Power Source: State of Art, Applications, and Challenges

et al. 2019

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confidence: 99%

“…Piezoelectric and ferroelectric nanowires are promising candidates for nanoscale functional applications, − including biomedical electronics, self-powered wearable and human activity monitoring devices, and multienergy harvesting . For example, piezoelectric zinc-oxide nanowires were found to function as nanogenerators for self-powered nanodevices − where they can produce the output current of 0.6 μA and associated current density of 20 μA/cm 2 , while sodium–potassium niobate nanorods were reported to have the short-circuit current of 5.0 μA . KNbO 3 nanowire composite structures were reported to function as flexible pyroelectric nanogenerators, while ferroelectric PZT nanowires were found to exhibit dramatically high pyroelectric open-circuit voltage and short-circuit current in a pyroelectric nanogenerator .…”

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confidence: 99%

“…13 For example, piezoelectric zinc-oxide nanowires were found to function as nanogenerators for self-powered nanodevices 1−4 where they can produce the output current of 0.6 μA and associated current density of 20 μA/cm 2 , 1 while sodium−potassium niobate nanorods were reported to have the short-circuit current of 5.0 μA. 5 KNbO 3 nanowire composite structures were reported to function as flexible pyroelectric nanogenerators, 6 while ferroelectric PZT nanowires were found to exhibit dramatically high pyroelectric open-circuit voltage and short-circuit current in a pyroelectric nanogenerator. 8 P3HT/ZnO micro/nanowire heterojunctions were proposed as functional elements for solar cells.…”

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confidence: 99%

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All-Mechanical Polarization Control and Anomalous (Electro)Mechanical Responses in Ferroelectric Nanowires

2018

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Piezoelectric and ferroelectric nanowires exhibit properties and phases that are not available in the bulk. They are extremely promising for functional nanoscale application. On the basis of atomistic first-principles-based simulations, we predict an all-mechanical polarization control in ferroelectric nanowires. We report that the application of uniaxial compressive stress to ferroelectric nanowires with poor surface charge compensation leads to a reversible phase switching between the polar phase with axial polarization and macroscopically nonpolar flux-closure phase. The phase switching is associated with anomalously large changes in polarization and piezoelectric and mechanical response. In particular, in PbTiO nanowires the values as large as 5400 pC/N and 140 TPa are predicted for the piezoelectric coefficient and elastic constant, respectively. Remarkably, the effect persists up to the gigahertz frequency which is potentially promising for nanoscale applications, such as nanogenerators, biomedical electronics, monitoring devices, nanosensors, nanotransducers, and nanoactuators.

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Multifunctional Thermochromic Dye‐Integrated Hybrid Nanogenerators for Mechanical Energy Harvesting and Real‐Time IoT Sensing

Graham,

Manchi,

Paranjape

et al. 2024

Adv Funct Materials

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Hybrid nanogenerators are advanced mechanical energy harvesters capable of simultaneously scavenging multiple types of energy. Additionally, thermochromic materials provide a practical and visually assessable method for real‐time temperature monitoring. In this report, a novel energy harvester and sensing patch (EHSP) is introduced, that utilizes combined piezoelectric and triboelectric effects to harvest mechanical energy efficiently. To optimize the EHSP, various energy harvester configurations are fabricated and tested, and the dielectric properties of triboelectric films are systematically investigated. These improvements are implemented to augment the overall energy harvesting capability. The thermochromic properties of the EHSP are also explored to enhance both the electrical performance and thermal responsiveness. The EHSP demonstrates the ability to generate maximum voltage and current outputs of 350 V and 20.4 µA, respectively. Moreover, it can detect temperature changes within seconds, making it suitable for both energy harvesting and sensing applications. The EHSP is tested in practical scenarios, proving its efficiency as an energy harvester and sensor for everyday human activities. Furthermore, its integration with multiple hybrid nanogenerators showcases its potential for industrial and wearable sensing applications.

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Sodium‐potassium niobate nanorods with various crystal structures and their application to nanogenerator

Cited by 11 publications

References 38 publications

Nanogenerators as a Sustainable Power Source: State of Art, Applications, and Challenges

Nanogenerators as a Sustainable Power Source: State of Art, Applications, and Challenges

All-Mechanical Polarization Control and Anomalous (Electro)Mechanical Responses in Ferroelectric Nanowires

Multifunctional Thermochromic Dye‐Integrated Hybrid Nanogenerators for Mechanical Energy Harvesting and Real‐Time IoT Sensing

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