Ultrahigh piezoelectric coefficients of Li-doped (K,Na)NbO3 nanorod arrays with manipulated O-T phase boundary: Towards energy harvesting and self-powered human movement monitoring

Jiang, Lei; Yang, Piaoyun; Fan, Yu; Zeng, Shi; Wang, Zhao; Pan, Zhenghui; He, Yahua; Xiong, Juan; Zhang, Xianghui; Hu, Yongming; Gu, Haoshuang; Wang, Xiaolin; Wang, John

doi:10.1016/j.nanoen.2021.106072

Cited by 23 publications

(21 citation statements)

References 51 publications

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“…For applications such as energy harvesters and self-powered sensors, piezoelectric thin films can be replaced by nanorod arrays which, in contrast to thin films, can be readily grown with controlled stoichiometry. [184,[420][421][422] According to recent studies, KNN-based self-assembled nanorod arrays show a large d* 33 (360-814 pm V −1 ) driven by phase boundary manipulation, showing great potential for wearable devices. [184,421] Interestingly, O-T-based PPB can be obtained in these nanorods with simple composition either by postannealing or Li doping, whereas the piezoelectric properties at such PPB are much higher compared to those of KNN-based ceramics.…”

Section: Synergistic Designmentioning

confidence: 99%

“…[184,[420][421][422] According to recent studies, KNN-based self-assembled nanorod arrays show a large d* 33 (360-814 pm V −1 ) driven by phase boundary manipulation, showing great potential for wearable devices. [184,421] Interestingly, O-T-based PPB can be obtained in these nanorods with simple composition either by postannealing or Li doping, whereas the piezoelectric properties at such PPB are much higher compared to those of KNN-based ceramics. [388] Such large enhancement can be attributed to the easy polarization rotation facilitated by the phase coexistence working in synergy with clamping/ pinning-free domain switching, [423] and/or surface effects.…”

Section: Synergistic Designmentioning

confidence: 99%

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Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Waqar

Chen

et al. 2021

Advanced Materials

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for piezoelectric devices was estimated to be worth $25.1 billion with a projected compounded annual growth rate (CAGR) of 6.2%. [6] However, the development of piezoelectrics took more than a century to evolve from quartz, which is among the first known piezoelectric materials, [7,8] to their current forms in the modern era. The evolution of piezoelectrics is, hence, rich with the exciting discoveries in fundamental physics, paving the way to the development of applications that changed the course of history. One such example is the invention of sonar by Paul Langevin and team in 1917 [9] which is still essentially implemented today for underwater acoustics and navigation. Later, the discovery of ferroelectricity in BaTiO 3 polycrystal in 1946 [10,11] and phase transition (now referred to as a morphotropic phase boundary (MPB)) in PbZrO 3 -PbTiO 3 solid solution in 1954 [12] stimulated a worldwide interest in gaining fundamental understanding of electromechanical coupling in ferroelectric materials to develop better and more reliable piezoelectric devices. [13][14][15] By contrast, the research on piezoelectrics in the past two decades has been driven mainly by the environmental and health concerns related to the toxicity of lead, which is a primary constituent of the widely used lead-based piezoelectric ceramics, [16,17] where the best known example is lead zirconium titanates (PZT). Consequently, the stringent regulations all over the world to restrict the use of lead [18] have resulted in the rise of "lead-free" ceramics which further gained popularity after Saito et al.'s discovery of large piezoelectric response in a lead-free piezoceramic. [19] These eco-friendly materials represent now although a relatively small part of the current piezoelectrics market, with a total estimate of around $172 million, but, their sales are projected to reach $443 million by 2024 with a CAGR of 20.8%. [6] ABO 3 -type perovskite oxide ferroelectrics hold great technical value owing to their large spontaneous polarization, which makes them highly suitable for piezoelectric applications. [1,3,20] In recent years, the research efforts have been primarily focused on developing new strategies to produce high-performance lead-free oxide piezoelectrics with properties at least comparable to or surpassing those of the lead-based counterparts, such as PZT. [20] These strategies have mainly Piezoelectric materials are known to mankind for more than a century, with numerous advancements made in both scientific understandings and practical applications. In the last two decades, in particular, the research on piezoelectrics has largely been driven by the constantly changing technological demand, and the drive toward a sustainable society. Hence, environmental-friendly "lead-free piezoelectrics" have emerged in the anticipation of replacing lead-based counterparts with at least comparable performance. However, there are still obstacles to be overcome for realizing this objective, while the efforts in this direction already seem to culminat...

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Section: Synergistic Designmentioning

confidence: 99%

Section: Synergistic Designmentioning

confidence: 99%

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Waqar

Chen

et al. 2021

Advanced Materials

Self Cite

View full text Add to dashboard Cite

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“…A TiO x film is used as the electron blocking layer (EBL) and inserted between the electrode and triboelectric layers, which could enhance the polarization due to the coupling effects of electron blocking and improve the electrical output performance significantly. Although the power output of TENGs has been enhanced greatly using organic polymers with additives as friction layers, the electrical output performance of TENGs is still far from satisfactory. − …”

Section: Introductionmentioning

confidence: 99%

High-k Lead-Free Ferroelectric KNN as an Electron Blocking Layer toward Efficient Hybrid Piezoelectric–Triboelectric Nanogenerators

Meng

Yang

et al. 2022

ACS Appl. Electron. Mater.

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Lead-free ferroelectric one-dimensional nanostructures exhibit great potential in building micro/nanoenergy harvesters owing to their high dielectric constant and piezoelectric properties. Herein, potassium sodium niobate (KNN) nanostructures are embedded into a poly(dimethylsiloxane) (PDMS) film to develop a hybrid piezoelectric–triboelectric nanogenerator (PTENG) that scavenges mechanical energy efficiently. By comparing different structures with and w/o the functional KNN layer, the spontaneous polarized electric field produced by the KNN-Mn film is systematically investigated, and its function as an electron blocking layer to hinder electron transfer is also well illustrated. Furthermore, after embedding KNN-Ca nanorods into PDMS to enhance relative permittivity, we find that the induced polarized electric field initiated by KNN-Ca nanorods binds free electrons and acts as a charge retention transition layer to further boost surface charge density. This work brings ideas to prepare high-performance PTENGs by applying ferroelectric materials with high permittivity.

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“…In the past few years, flexible and wearable electronics including solar cells, nanogenerators, field effect transistors (FETs), and electronic skin (e-skin) have been extensively investigated due to their potential applications in human–machine interfaces, the internet of things (IoT), robot automation, and the biomedical field. − Of particular interest, nanogenerators and e-skin have attracted widespread attention around the world because of their ability to mimic comprehensive properties of human skin and to detect different mechanical stimuli such as pressure, strain, and flexion in self-power mode. − Additionally, miniaturization, portability, and easy integration with apparel for scavenging mechanical energy from human body motion established the human and machine integration that may have potential utility in the healthcare sector such as rehabilitation assistance after orthopedic surgery, voice recognition, and circulatory system monitoring of overall health status . Moreover, wearable pressure sensors must satisfy the following necessary prerequisites: high sensitivity, a wide pressure-sensing range, and a quick response/recovery time.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional MOF Modulated Fiber Nanogenerator for Effective Acoustoelectric Conversion and Human Motion Detection

Roy

Jana

Mallick³

et al. 2021

Langmuir

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The real-time application of piezoelectric nanogenerators (PNGs) under a harsh environment remains a challenge due to lower output performance and poor durability. Thus, the development of flexible, sensitive, and stable PNGs became a topic of interest to capture different human motions including gesture monitoring to speech recognition. Herein, a scalable approach is adapted where naphthylamine bridging a [Cd(II)-μ-I4] two-dimensional (2D) metal–organic framework (MOF)-reinforced poly(vinylidene fluoride) (PVDF) composite nanofibers mat is prepared to fabricate a flexible and sensitive composite piezoelectric nanogenerator (C-PNG). The needle-shaped MOF was successfully synthesized by the layering and diffusion of two different solutions. The incorporation of single-crystalline 2D MOF ensures a large content of electroactive phases (98%) with a resultant high-magnitude piezoelectric coefficient of 41 pC/N in a composite nanofibers mat due to the interfacial specific interaction with −CH2–/–CF2– dipoles of PVDF. As an outcome, C-PNG generates high electrical output (open-circuit voltage of 22 V and maximum power density of 24 μW/cm2) with a very fast response time (t r ≈ 5 ms) under periodic pressure imparting stimuli. Benefiting from bending and twisting functionality, C-PNG is capable of scavenging biomechanical energy by mimicking complex musculoskeletal motions that broaden its application in wearable electronics and fabric integrated medical devices. In addition, C-PNG also demonstrates an efficient acoustic vibration to electric energy conversion capability with an improved power density and acoustic sensitivity of 6.25 μW and 0.95 V/Pa, respectively. The overall energy conversion efficiency is sufficient to operate several consumer electronics without any energy storage unit. This acoustic observation is further validated by the finite element method-based theoretical simulation. Overall, the 2D MOF-based device design strategy opens up a new possibility to develop a human-motion compatible energy generator and a self-powered acoustic sensor to power up electronic gadgets as well as low-frequency noise detection.

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Ultrahigh piezoelectric coefficients of Li-doped (K,Na)NbO3 nanorod arrays with manipulated O-T phase boundary: Towards energy harvesting and self-powered human movement monitoring

Cited by 23 publications

References 51 publications

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

High-k Lead-Free Ferroelectric KNN as an Electron Blocking Layer toward Efficient Hybrid Piezoelectric–Triboelectric Nanogenerators

Two-Dimensional MOF Modulated Fiber Nanogenerator for Effective Acoustoelectric Conversion and Human Motion Detection

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