Wearable Ultrahigh Current Power Source Based on Giant Magnetoelastic Effect in Soft Elastomer System

Abstract

In this study, we present the observation of the giant magnetoelastic effect that occurs in soft elastomer systems without the need of external magnetic fields and possesses a magnetomechanical coupling factor that is four times larger than that of traditional rigid metal-based ferromagnetic materials. To investigate the fundamental scientific principles at play, we built a linear model by using COMSOL Multiphysics, which was consistent with the experimental observations. Next, by combining the giant magnetoelastic effect with electromagnetic induction, we developed a magnetoelastic generator (MEG) for biomechanical energy conversion. The wearable MEG demonstrates an ultrahigh output current of 97.17 mA, a low internal impedance of around ∼40 Ω, and an intrinsic waterproof property. We further leveraged the wearable MEG as an ultrahigh current power source to drive a Joule-heating textile for personalized thermoregulation, which increased the temperature of the fiber-shaped resistor by 0.2 °C. The development of the wearable MEG will act as an alternative and compelling approach for on-body electricity generation and arouse a wide range of possibilities in the renewable energy community.

Piezoelectric nanogenerators for personalized healthcare

“…Especially for implanted devices, self-powered devices can effectively prevent secondary surgeries needed to replace power sources, providing tremendous advantages and important application prospects. [72][73][74][75] Several technologies can convert these biomechanical energies into electrical energy, including but not limited to the piezoelectric effect, [76][77][78] triboelectric effect, [79][80][81][82][83][84][85][86][87] magnetoelastic effect, [88][89][90][91] and electromagnetic effect. [92][93][94] Among them, piezoelectric nanogenerators (PENGs) based on the piezoelectric effect have attracted significant attention since their invention in 2006.…”

Progress in Hybridization of Covalent Organic Frameworks and Metal–Organic Frameworks

“…In recent years, research on energy conversion and storage has grown exponentially due to the increasing energy demands and global environmental degradation. [149][150][151][152][153][154][155][156][157][158][159][160][161][162] COF and MOF have also been widely applied in the field of energy storage in the form of Li-ion batteries, supercapacitors, and hydrogen storage for their porous structure and atom-level designability. [163][164][165][166][167][168][169][170][171][172][173][174][175] Intimate hybridization between the two components was highly desirable by combining the merits of COF and MOF to acquire the maximum performance.…”

Mechanically mutable polymer enabled by light

“…1.0 to 100 MPa) ( 5 ). This mechanical characteristic can match the Young’s moduli of the human skin (in an order of kilopascal), which allows to fit seamlessly with the human skin and is suitable for wearable applications ( 6 ). Moreover, soft elastomers are relatively novel bundled materials served as programmable adhesives, which can be used in a wide range of object surfaces ( 7 ).…”