A long debate on the charge identity and associated mechanisms occurring in contact-electrification (CE) (or triboelectrification) has persisted for many decades, while a conclusive model not yet been reached explaining this phenomenon known more than 2600 years! Here, new method is reported to quantitatively investigate real-time transfer CE via triboelectric nanogenerator as function of temperature, which reveals that electron dominant process between two inorganic solids. study surface...

Abstract With its light weight, low cost and high efficiency even at operation frequency, the triboelectric nanogenerator is considered a potential solution for self-powered sensor networks large-scale renewable blue energy. As an energy harvester, output power density are dictated by charge density. Here we report method increasing coupling surface polarization from triboelectrification hysteretic dielectric ferroelectric material in vacuum ( P ~ 10 −6 torr). Without constraint of air...

Rapid advancements in stretchable and multifunctional wearable electronics impose a challenge on corresponding power devices that they should have comparable portability stretchability. Here, we report highly washable all-yarn-based self-charging knitting textile enables both biomechanical energy harvesting simultaneously storing by hybridizing triboelectrical nanogenerator (TENG) supercapacitor (SC) into one fabric. With the weft-knitting technique, is qualified with high elasticity,...

The development of wearable and large-area energy-harvesting textiles has received intensive attention due to their promising applications in next-generation functional electronics. However, the limited power outputs conventional have largely hindered development. Here, combination with stainless steel/polyester fiber blended yarn, polydimethylsiloxane-coated nonconductive binding a high-power-output textile triboelectric nanogenerator (TENG) 3D orthogonal woven structure is developed for...

In addition to x-ray diffraction, Raman spectrum measurements provide direct evidence of the tetragonal and orthorhombic phases coexistence in lead-free ceramics (1−x)K0.5Na0.5NbO3 (KNN)–xLiTaO3 when x equals 5mol%. This is caused by phase transition temperature between decreasing around room due Li Ta doping KNN, not constituting a region morphotropic boundary as presented most published papers. The results indicate that although this kind ceramic displays good properties, it needs further...

Abstract The rapid development of Internet Things and artificial intelligence brings increasing attention on the harvesting distributed energy by using triboelectric nanogenerator (TENG), especially direct current TENG (DC-TENG). It is essential to select appropriate materials for obtaining a high performance TENG. In this work, we provide set rules selecting DC-TENG based several basic parameters, including surface charge density, friction coefficient, polarization, utilization rate...

Abstract Cadmium sulfide (CdS) has received widespread attention as the building block of optoelectronic devices due to its extraordinary properties, low work function, and excellent thermal chemical stability. Here, a self‐powered flexible photodetector (PD) based on p‐Si/n‐CdS nanowires heterostructure is fabricated. By introducing pyro‐phototronic effect derived from wurtzite structured CdS, PD shows broadband response range, even beyond bandgap limitation, UV (325 nm) near infrared (1550...

Self-powered photodetectors (PDs) have long been realized by utilizing photovoltaic effect and their performances can be effectively enhanced introducing the piezo-phototronic effect. Recently, a novel pyro-phototronic is invented as an alternative approach for performance enhancement of self-powered PDs. Here, organic/inorganic PD demonstrated influences externally applied strain on effects are thoroughly investigated. Under 325 nm 2.30 mW cm-2 UV illumination at -0.45% compressive strain,...

As a new-era of energy harvesting technology, the enhancement triboelectric charge density nanogenerator (TENG) is always crucial for its large-scale application on Internet Things (IoTs) and artificial intelligence (AI). Here, microstructure-designed direct-current TENG (MDC-TENG) with rationally patterned electrode structure presented to enhance effective surface by increasing efficiency contact electrification. Thus, MDC-TENG achieves record high ~5.4 mC m-2, which over 2-fold...

Abstract As a promising energy harvesters, triboelectric nanogenerators (TENG) can be utilized to convert distributed into electric power, but the slow charge accumulation incorporated with inevitable decay/leakage of conventional TENGs result in low surface density and an inferior output performance, limiting their practical applications. Here, effective strategy is proposed realize high by using fast process on dielectric material relative permittivity. result, tremendously improved 2.20...

By converting electrical signal into mechanical displacement, piezoelectric actuators are widely used in many applications due to their precise fast response, and small size. The unipolar electrostrain values larger than 1% reported so far from lead-based single crystals or ceramics, which brings environmental concerns. Herein, a giant of 1.6% with good fatigue resistance low hysteresis Sr/Nb-doped Bi0.5 (Na0.82 K0.18 )0.5 TiO3 lead-free textured piezoceramics by defect dipole design is...

Lead-free K1−xNaxNbO3 ceramics with x=0.48–0.54 were prepared by a conventional solid-state reaction method to investigate the influence of K/Na ratio on phase structures and electrical properties. The results suggest that typical morphotropic boundary exists at x=0.52–0.525, separating monoclinic orthorhombic phases. sample composition near x=0.52 shows maximum values piezoelectric constant (d33=160 pC/N) electromechanical coupling coefficient (kt=47%). provide helpful guidance consider...

A nanogenerator, as a self-powered system, can operate without an external power supply for energy harvesting, signal processing, and active sensing. Here, near-infrared (NIR) photothermal triggered pyroelectric nanogenerators based on pn-junctions are demonstrated in p-Si/n-ZnO nanowire (NW) heterostructure NIR photosensing. The pyroelectric-polarization potential (pyro-potential) induced within wurtzite ZnO NWs couples with the built-in electric field of pn-junction. At moment turning or...

With the fast development of Internet Things, requirements system miniaturization and integration have accelerated research on multifunctional sensors. Based triboelectric nanogenerator, a self-powered motion sensor (MFMS) is proposed in this work, which capable detecting parameters, including direction, speed, acceleration linear rotary motions, simultaneously. The MFMS consists nanogenerator (TENG) module, magnetic regulation an acrylic shell. TENG module formed by placing free-standing...

Piezoelectric actuators have been extensively utilized as micro-displacement devices because of their advantages large output displacement, high sensitivity, and immunity to electromagnetic interference. Here, we propose a straightforward approach design <110>-oriented defect dipoles by introducing A-site vacancies oxygen in (K

Defect dipoles in acceptor-doped (K0.5Na0.5)NbO3-based ceramics have a significant influence on their electrical properties. The present study examined the of sintering atmosphere properties MnO2-doped (K0.5Na0.5)NbO3. poled and aged samples sintered Ar depicted unusual behavior related to formation defect (Mn2+Nb‴−VO··)′, aligned poling direction having larger polarity. S-E loop (K0.5Na0.5)NbO3 revealed strains restrained opposite direction. Furthermore, it is observed that unipolar...