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Despite the material performances being superior to those of organic materials, inorganic materials are typically excluded for use in flexible and deformable electronic systems because of their rigid nature and the requirement for high processing temperature. This work presents a novel method of utilizing rigid NiZn-ferrite films in a flexible platform and offers an opportunity to realize a flexible wireless power transfer (WPT) module. Inkjet printing is introduced in this study since it can coat NiZn-ferrite films as well as pattern inductor coils for WPTs. A thermochemically inert buffer layer is selected based on a thermodynamic analysis and is introduced as a buffer layer for the NiZn-ferrite to prevent chemical reaction between the ferrite film and the substrate and ensure that the ferrite film can be easily separated from the substrate during a high-temperature sintering process. A Ag-inductor coil is printed on the NiZn-ferrite layer, and then the entire layer is embedded into polydimethylsiloxane, which renders the WPT module flexible. The flexibility of the WPT module is characterized by a bending test, and the structural and magnetic properties are also investigated. The performance of the flexi ble WPT module is demonstrated by transmitting wireless power to a light emitting diode.

Phone: þ85 63 219 5338We developed metal-grid hybrid transparent conducting electrodes (TCEs) by combining a metal grid with a conducting polymer. Metal-grid hybrid TCEs were prepared by inkjetprinting with both PEDOT:PSS and Ag nanoparticle inks and applied to the fabrication of organic solar cells (OSCs) instead of indium tin oxide (ITO). The electrical and optical properties of the metal-grid hybrid TCEs were optimized by modulating the Ag grid's line-to-line spacing (pitch). With a Ag-grid pitch of 1 mm, the metal-grid hybrid TCEs exhibited a sheet resistance of 10.3 V sq À1 and an optical transmittance of 73% which represented 10% reduction when compared to the optical transmittance of inkjet-printed PEDOT:PSS films without Ag grids. Ag covering factor (ACF) was defined using the geometry of the Ag-grid and incorporated in a theoretical model to calculate the electrical and optical properties of the inkjet-printed metal-grid hybrid TCEs. It was found that the experimental values of the TCEs' electrical and optical properties were in good agreement with the calculation results based on the ACF-incorporated theoretical model. OSCs fabricated with the metal-grid hybrid TCEs showed a power-conversion cell efficiency comparable to those of conventional OCSs using ITO. This indicates that the inkjetprinted metal-grid hybrid TCE is a promising replacement for ITO to realize cost-effective OSCs.

With the growing interest in suppressing greenhouse gas emissions from fossil fuel combustion, the implementation of electrical energy storage devices for efficiently utilizing renewable energy is expanding worldwide. Zn-ion batteries are attractive for energy storage because of their safety, eco-friendliness, high energy density, and low cost. However, their commercialization is hindered by the poor rechargeability of the zinc anode because of Zn dendrite growth and hydrogen evolution. Herein, we present the application of an artificial layer composed of bimodal BaTiO 3 particles on Zn metal to boost the dielectric properties and thus enhance the reversibility of Zn anodes during long-term cycling. The BaTiO 3 layer induces electric polarization under external electric fields, causing the Zn ions to move sequentially toward the Zn anode. Moreover, its mechanical characteristics alleviate the volume changes between the BaTiO 3 layer and Zn metal. Consequently, Zn dendrite growth is effectively inhibited, and the electrochemical performance is significantly improved in Zn|Zn symmetric cells, resulting in a low overvoltage (39 mV) and stable cycling (800 h) at 1 mA cm −2 . Moreover, the Zn-ion full cell using an α-MnO 2 cathode exhibits consistent capacity retention up to 380 cycles. This study demonstrates a new strategy to economically and readily suppress dendrite formation by using bimodal dielectric particles as artificial layers to stabilize metal-based batteries.