High-Performance Aqueous Zinc-Ion Battery Based on Laser-Induced Graphene

Zn-ion batteries(ZIBs)have a broad application prospect because of their advantages of high power,large capacity,and high energy density.However,the development of high-capacity,long-lifespan ZIBs is challenging because of the faster dendrite growth and the occurrence of the hydrogen evolution reaction.Laser-induced graphene(LIG)is a material with many defects and heteroatoms.Because of these characteristics,it plays an important role in improving nucleation.A simple and effective method for preparing LIG was proposed in this paper,and the LIG was covered on the surface of Zn foil to form a composite structure.This structure substantially reduces the nucleation overpotential of Zn and slows down the dendrite growth of Zn by improving the nucleation behavior of Zn^(2+).Simultaneously,the three-dimensional porous structure increases the specific surface area of the electrode,so the battery has a larger specific capacity.Compared with the bare Zn electrode,the composite electrode possesses lower overpotential and longer cycle life.In addition,the full battery using activated carbon as the active material exhibits great rate and cycle performance.This facile and scalable approach may solve the problem of Zn dendrite growth,which is crucial for the large-scale application of ZIBs.

The Study on the Anti-corrosion Performance of NiTi Alloy in Human Body Solution with the Fabricating Processes of Laser Irradiation and PDMS Modification

This paper presents a new and safe method of fabricating super-hydrophobic surface on NiTi Shape Memory Alloy(SMA),which aims to further improve the corrosion resistance performance and biocompatibility of NiTi SMA.The super-hydrophobic surfaces with Water Contact Angle(WCA)of 155.4°±0.9°and Water Sliding Angle(WSA)of 4.4°±1.1°were obtained by the hybrid of laser irradiation and polydimethylsiloxane(PDMS)modification.The forming mechanism was systematically revealed via Scanming Electron Microscopy(SEM)and X-ray Photoelectron Spectroscopy(XPS).The ant-corrosion of samples was investigated in Simulated Body Fluid(SBF)via the potentiodynamie polarization(PDP)and Electrochemical Impedance Spectroscopy(EIS)tests.PDMS super-hydrophobic coatings showed superior anti-corrosion performance.The Ni ions release experiment was also conducted and the corresponding result demonstrated that the super-hydrophobic samplcs effectively inhibited the rclease of Ni ions both in clctrolyte and SBF Besides,biocompaibility was further analyzed,indicating that the prepared super-hydrophobic surfaces present a huge potential advantage in biocompatibility.