Mingfei Jiang,Gangqiang Tang,Yu Shu,Shilong Liu,Chun Zhao,Yanjie Wang
Ionic polymer-metal composites (IPMC) have emerged as an ideal material for artificial skin applications due to their exceptional flexibility and skin-mimetic ion transport properties. However, conventional IPMC fabricated from commercial Nafion membranes are typically limited to a minimum thickness of 50 μm, which significantly restricts their compatibility with human skin. In this study, we developed a novel fabrication process for thin IPMC with thickness of less than 50 μm. We successfully cast Nafion films with thicknesses of 30 μm, 40 μm, 50 μm, and 60 μm by using the glass-slide drip-casting technique. Then Pd-Au composite electrodes were deposited on their surfaces by electroless plating (immersion reduction, IR) and electroplating. We analyzed and evaluated the electrochemical performance and bending sensing performance of IPMC with different thicknesses. The specific capacitance of the IPMC with a thickness of 60 μm was 3 times higher than that of the sample with a thickness of 30 μm, and the sensing performance was 4.25 times higher. Compared with the IPMC prepared from a commercial Nafion film (50 μm) of the same thickness (bending output voltage of 0.4 mV), the IPMC prepared by this process showed superior sensing performance (bending output voltage of 0.8 mV). After 1000 bending cycles, the signal attenuation rate remained below 5%. This work provides important technical support for the research and development of ultra-thin flexible sensors.
Sodium superionic conductor (NASICON)-type conducting ceramic Li 1+x Al x Ti 2−x (PO 4 ) 3 (LATP) has been regarded as one of the most promising candidates for high-safety and high-energy density solid-state Li metal batteries (SSLMBs) because of its high ionic conductivity and good chemical stability. However, the large interfacial impedance and instability between the solid electrode and LATP electrolyte severely hinder its practical application in solid-state batteries. To overcome this technical challenge, we demonstrate a polymer–ceramic–polymer composite electrolytes (PCPCEs) prepared through drop casting, which ameliorates the interfacial stability between the solid electrolyte and the electrode. PCPCEs with an ideal ambient-temperature ionic conductivity can drastically reduce the interfacial resistance between the LATP and solid electrodes and effectively avoid a direct reaction and contact between them. As a result, the interfacial impedance decreases from 30,000 to 280 Ω for the Li–LATP interfaces and from 40,000 to 800 Ω for the LATP–LiFePO 4 (LFP) interfaces. Meanwhile, the polarization voltage of the Li||PCPCEs||Li symmetric cell reduces from 1.5 V to 100 mV. The solid-state Li metal batteries assembled with a Li metal anode , LFP cathode, and PCPCEs exhibit a desired initial discharge capacity of 152.5 mAh g −1 and a good cycling performance at 0.1 C for 25 °C. This study provides a prospective insight to improve the poor interface between the solid electrode and inorganic conducting ceramic.
Chen Zhan,Jiahui Zhang,Junxing Hao,Zhihong Liu,Chengguo Hu
A drop-casting method for the scalable construction of a solar cell-type light-addressable photoelectrochemical (PEC) sensor on commercial phenol resin (PR) plates is reported. The sensor was fabricated by laser writing of addressable laser-induced graphene (LIG) electrode arrays on PR plates with ring-disc dual-electrode cell configurations using a 405 nm laser machine. Beneficial from the good hydrophilicity of PR-based LIG and the excellent film formation of bismuth sulfide nanorods (Bi 2 S 3 NRs), uniform Bi 2 S 3 photovoltaic films can be reproducibly deposited onto the LIG disc photoanode array via drop casting modification, which show a sensitive photocurrent response toward thiocholine (TCl) when the ring cathode array was coated with Ag/AgCl. An acetylcholinesterase (AChE)-based PEC biosensor was therefore constructed by a similar drop-casting modification method. The resulting biosensor exhibits good sensitivity toward an AChE inhibitor , i.e., galantamine hydrobromide (GH), with a calibration range of 10–300 μM and a detection limit of 7.33 μM (S/N = 3). Moreover, the biosensor possesses good storage stability, which can achieve the high-throughput screening of AChE inhibitor drugs from traditional Chinese medicines (TCMs). The present work thus demonstrates the promising application of LIG technology in constructing light-addressable PEC sensing devices with high performance and low cost.
危险品化学品经营许可证（带存储）