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Funding for school -level research projects of Yancheng Institute of Technology[xjr2021054]
No full textPlasma induced rich oxygen vacancies fiber-like ZnO for efficient photocatalytic CO2 reduction
No full textPhotoreduction CO2 to value-added fuels (CO, CH4, etc.) driven by solar energy gives a green way for managing the global carbon balance. Through the radio-frequency thermal plasma treatment, fiber-like structured ZnO with rich oxygen defects were successfully designed and synthesized. The rich oxygen vacancies, created new energy level, could not only hinder the recombination of photo-generated electron/hole pairs, but also broaden the light absorption range. Besides, combined the natural advantages of one-dimensional (1D) structure, which could enable itself avoid aggregation during performance evolution within the humid environment and shorten the transfer path length of the photo-induced carriers and promote more electron/hole to migration to the surface of the photocatalyst. Therefore, when applied in CO2 photoreduction, the optimal fiber-like ZnO with rich oxygen defects catalyst behaved outstanding photocatalytic performance with a CO2-to-CO rate of 15.76 mu mol g- 1 h-1
Major Scientific and Techno- logical Innovation Project of Shandong Province[2019JZZY010518]
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A self-healing polyacrylic acid-based hydrogel electrolyte for flexible quasi-solid-state electrochromic device
No full textDue to the demand for healing damages caused during applications, it is desired to develop self-healing hydrogel electrolytes for flexible electrochromic device (ECD). A hydrogel electrolyte with remarkable self-healing ability, outstanding stretchability, and high ionic conductivity is presented in this work. Non-covalent interactions such as ionic connections between Ca2+ and-COO-, as well as numerous hydrogen bonds between PAA and HPMC, form dynamically cross-linked PAA-HPMC-Ca hydrogel electrolytes. Owing to the exceptional reversibility of non-covalent interactions, the hydrogel electrolyte exhibits remarkable self-healing and durability. Fracture strain and stress in the self-healed PAA-HPMC-Ca hydrogel can reach 429% and 240 KPa, respectively. In addition, a flexible ECD based on PAA-HPMC-Ca hydrogel electrolyte and a WO3 electrochromic layer was assembled and evaluated. The flexible quasi-solid-state ECD possesses excellent modulation transmittance range (approximately 66%), high coloration efficiency and steady response time. Thanks to the stability of the PAA-HPMC-Ca hydrogel electrolyte, the flexible ECD exhibits a great stability over 1000 cycles. This study may pave the way for self-healing electrolyte gels to be used in ECDs, supercapacitors, and batteries, among other flexible electrochemical devices
Kinetics study and recycling strategies in different stages of full-component pyrolysis of spent LiNixCoyMnzO2 lithium-ion batteries
No full textFull-component pyrolysis has been proven to be a prospective method for the disposal of organic matters and the cathode material reduction of spent LiNixCoyMnzO2 (NCM) lithium-ion batteries (LIBs). However, the kinetics of the full-component pyrolysis of spent NCM LIBs is still unclear. This work represents the first attempt to study the kinetics of different stages of full-component pyrolysis of NCM LIBs based on isoconversional method to guide the recycling of spent LIBs. Pyrolysis process was divided into four stages in accordance to the main weight loss temperature ranges and the classical Kissinger-Akahira-Sunose and Flynn-Wall-Ozawa kinetics models were employed to calculate the activation energy (E) in each stage. The main physicochemical reactions were clarified though in situ analysis, and the average E in the four stages was determined: (I) The volatilization of electrolytes occurred in the temperature range of 100-200 degrees C with the E of 98.6 kJ/mol. (II) The decomposition of organic matters and the preliminary reduction of cathode material transpired in the temperature range of 400-500 degrees C with the E of 227.2 kJ/mol. (III) The further reduction of NiO and CoO occurred from 650 to 800 degrees C with the E of 258.8 kJ/mol. (IV) The reduction of MnO took place from 850 to 1000 degrees C with the E of 334.9 kJ/mol. The recycling strategies based on full-component pyrolysis of spent NCM LIBs was accordingly proposed. During pyrolysis, the cathode material was gradually reduced and the pyrolytic products can be controlled through temperature regulation
A 3D bioprinted tumor model fabricated with gelatin/sodium alginate/decellularized extracellular matrix bioink
No full textTissue-engineered scaffolds are more commonly used to construct three-dimension-al (3D) tumor models for in vitro studies when compared to the conventional two-dimensional (2D) cell culture because the microenvironments provided by the 3D tumor models closely resemble the in vivo system and could achieve higher success rate when the scaffolds are translated for use in pre-clinical animal model. Physical properties, heterogeneity, and cell behaviors of the model could be regulated to simu-late different tumors by changing the components and concentrations of materials. In this study, a novel 3D breast tumor model was fabricated by bioprinting using a bioink that consists of porcine liver-derived decellularized extracellular matrix (dECM) with different concentrations of gelatin and sodium alginate. Primary cells were removed while extracellular matrix components of porcine liver were preserved. The rheolog-ical properties of biomimetic bioinks and the physical properties of hybrid scaffolds were investigated, and we found that the addition of gelatin increased hydrophilia and viscoelasticity, while the addition of alginate increased mechanical properties and porosity. The swelling ratio, compression modulus, and porosity could reach 835.43 +/- 130.61%, 9.64 +/- 0.41 kPa, and 76.62 +/- 4.43%, respectively. L929 cells and the mouse breast tumor cells 4T1 were subsequently inoculated to evaluate biocompatibility of the scaffolds and to form the 3D models. The results showed that all scaffolds exhibited good biocompatibility, and the average diameter of tumor spheres could reach 148.52 +/- 8.02 mu m on 7 d. These findings suggest that the 3D breast tumor model could serve as an effective platform for anticancer drug screening and cancer research in vitro
