Yu‐Long Lan  Cheng Chen  Xun Wang  Jia‐Cheng Lou  Jin‐Shan Xing  Shuang Zou  Ji‐Liang Hu  Wen Lyu  Bo Zhang 《Cell proliferation》2020,53(1)

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Wen‐Fan Yang  Femi Igbari  Yan‐Hui Lou  Zhao‐Kui Wang  Liang‐Sheng Liao 《Liver Transplantation》2020,10(13)

The chemical composition engineering of lead halide perovskites via a partial or complete replacement of toxic Pb with tin has been widely reported as a feasible process due to the suitable ionic radius of Sn and its possibility of existing in the +2 state. Interestingly, a complete replacement narrows the bandgap while a partial replacement gives an anomalous phenomenon involving a further narrowing of bandgap relative to the pure Pb and Sn halide perovskite compounds. Unfortunately, the merits of this anomalous behavior have not been properly harnessed. Although promising progress has been made to advance the properties and performance of Sn‐based perovskite systems, their photovoltaic (PV) parameters are still significantly inferior to those of the Pb‐based analogs. This review summarizes the current progress and challenges in the preparation, morphological and photophysical properties of Sn‐based halide perovskites, and how these affect their PV performance. Although it can be argued that the Pb halide perovskite systems may remain the most sought after technology in the field of thin film perovskite PV, prospective research directions are suggested to advance the properties of Sn halide perovskite materials for improved device performance.  相似文献   

    

Bing‐Qing Xiong  Xinwei Zhou  Gui‐Liang Xu  Yuzi Liu  Likun Zhu  Youcheng Hu  Shou‐Yu Shen  Yu‐Hao Hong  Si‐Cheng Wan  Xiao‐Chen Liu  Xiang Liu  Shengli Chen  Ling Huang  Shi‐Gang Sun  Khalil Amine  Fu‐Sheng Ke 《Liver Transplantation》2020,10(4)

Alloy materials such as Si and Ge are attractive as high‐capacity anodes for rechargeable batteries, but such anodes undergo severe capacity degradation during discharge–charge processes. Compared to the over‐emphasized efforts on the electrode structure design to mitigate the volume changes, understanding and engineering of the solid‐electrolyte interphase (SEI) are significantly lacking. This work demonstrates that modifying the surface of alloy‐based anode materials by building an ultraconformal layer of Sb can significantly enhance their structural and interfacial stability during cycling. Combined experimental and theoretical studies consistently reveal that the ultraconformal Sb layer is dynamically converted to Li₃Sb during cycling, which can selectively adsorb and catalytically decompose electrolyte additives to form a robust, thin, and dense LiF‐dominated SEI, and simultaneously restrain the decomposition of electrolyte solvents. Hence, the Sb‐coated porous Ge electrode delivers much higher initial Coulombic efficiency of 85% and higher reversible capacity of 1046 mAh g^?1 after 200 cycles at 500 mA g^?1, compared to only 72% and 170 mAh g^?1 for bare porous Ge. The present finding has indicated that tailoring surface structures of electrode materials is an appealing approach to construct a robust SEI and achieve long‐term cycling stability for alloy‐based anode materials.  相似文献   

    

Byong‐June Lee  Tong‐Hyun Kang  Ha‐Young Lee  Jitendra S. Samdani  Yongju Jung  Chunfei Zhang  Zhou Yu  Gui‐Liang Xu  Lei Cheng  Seoungwoo Byun  Yong Min Lee  Khalil Amine  Jong‐Sung Yu 《Liver Transplantation》2020,10(22)

Despite their high theoretical energy density and low cost, lithium–sulfur batteries (LSBs) suffer from poor cycle life and low energy efficiency owing to the polysulfides shuttle and the electronic insulating nature of sulfur. Conductivity and polarity are two critical parameters for the search of optimal sulfur host materials. However, their role in immobilizing polysulfides and enhancing redox kinetics for long‐life LSBs are not fully understood. This work has conducted an evaluation on the role of polarity over conductivity by using a polar but nonconductive platelet ordered mesoporous silica (pOMS) and its replica platelet ordered mesoporous carbon (pOMC), which is conductive but nonpolar. It is found that the polar pOMS/S cathode with a sulfur mass fraction of 80 wt% demonstrates outstanding long‐term cycle stability for 2000 cycles even at a high current density of 2C. Furthermore, the pOMS/S cathode with a high sulfur loading of 6.5 mg cm^?2 illustrates high areal and volumetric capacities with high capacity retention. Complementary physical and electrochemical probes clearly show that surface polarity and structure are more dominant factors for sulfur utilization efficiency and long‐life, while the conductivity can be compensated by the conductive agent involved as a required electrode material during electrode preparation. The present findings shed new light on the design principles of sulfur hosts towards long‐life and highly efficient LSBs.  相似文献   

    

Yun Lu  Jianing Liang  Yezhou Hu  Yi Liu  Ke Chen  Shaofeng Deng  Deli Wang 《Liver Transplantation》2020,10(7)

Heteroatom doping is widely recognized as an appealing strategy to break the capacitance limitation of carbonaceous materials toward sodium storage. However, the concrete effects, especially for heteroatomic phase transformation, during the sodium storage reaction remain a confusing topic. Here, a novel hypercrosslinked polymerization approach is demonstrated to fabricate pyrrole/thiophene hypercrosslinked microporous copolymer and further give porous carbonaceous materials with accurately regulated N/S dual doping corresponding to starting feeding ratios. Significantly, the N doping contributes to the conductivity and surface wettability, while the S doping is bridged to build stable active sites, which can be electrochemically converted into mercaptan anions via faraday reaction and further enhancing reversible capacities. Meanwhile, the abundant S doping can also conduce to the expanded interlayer spacing to shorten the ions diffusion distance, thus optimizing the reaction kinetic. As a result, the N_0.2S_0.8‐micro‐dominant porous carbon delivers the highest reversible capacity of 521 mAh g^?1 at 100 mA g^?1 and excellent cyclic stability over 2000 cycles at 2000 mA g^?1 with a capacity decay of 0.0145 mAh g^?1 per cycle. This work is anticipated to provide an in‐depth understanding of capacitance contribution and illuminate the heteroatomic phase transformation during sodium storage reactions for doping carbonaceous anodes.  相似文献   

    

Zhaodong Huang  Ao Chen  Funian Mo  Guojin Liang  Xinliang Li  Qi Yang  Ying Guo  Ze Chen  Qing Li  Binbin Dong  Chunyi Zhi 《Liver Transplantation》2020,10(24)

Output voltage and self‐discharge rate are two important performance indices for supercapacitors, which have long been overlooked, though these play a very significant role in their practical application. Here, a zinc anode is used to construct a zinc ion hybrid capacitor. Expanded operating voltage of the hybrid capacitor is obtained with novel electrolytes. In addition, significantly improved anti‐self‐discharge ability is achieved. The phosphorene‐based zinc ion capacitor exploiting a “water in salt” electrolyte with a working potential can reach 2.2 V, delivering 214.3 F g^?1 after 5000 cycles. The operating voltage is further extended to 2.5 V through the use of an organic solvent as the electrolyte; the solvent is prepared by adding 0.2 m ZnCl₂ into the tetraethylammonium tetrafluoroborate in propylene carbonate (Et₄NBF₄/PC) solvent, and it exhibits 105.9 F g^?1 even after 9500 cycles. More importantly, the phosphorene‐based capacitors possess excellent anti‐self‐discharge performance. The capacitors retain 76.16% of capacitance after resting for 300 h. The practical application of the zinc ion capacitor is demonstrated through a flexible paper‐based printed microcapacitor. It is believed that the developed zinc ion capacitor can effectively resolve the severe self‐discharge problem of supercapacitors. Moreover, high‐voltage zinc ion capacitors provide more opportunities for the application of supercapacitors.  相似文献   

    

Bolun Cheng  Xiao Liang  Yan Wen  Ping Li  Lu Zhang  Mei Ma  Shiqiang Cheng  Yanan Du  Li Liu  Miao Ding  Yan Zhao  Feng Zhang 《Journal of cellular biochemistry》2019,120(9):14831-14837

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Guo-Hui Huang  Xiang-Yuan Cao  Yuan-Yuan Li  Cheng-Cheng Zhou  Lei Li  Ke Wang  Hong Li  Peng Yu  Yi Jin  Liang Gao 《Journal of cellular biochemistry》2019,120(9):15776-15789

Traumatic brain injury (TBI) is a serious public health problem as well as a leading cause of severe posttraumatic disability. Numerous studies indicate that the differentially expressed genes (DEGs) of neural signaling pathways are strongly correlated with brain injury. To further analyze the roles of the DGEs in the central nervous system, here we systematically investigated TBI on the hippocampus and its injury mechanism at the whole genome level. On the basis of Gene Ontology and Kyoto Encyclopedia of Genes and Genomes Analyses, we revealed that the DEGs were involved in many signaling pathways related to the nervous system, especially neuronal survival-related pathways. Finally, we verified the microarray results and detected the gene expression of neuronal survival-related genes in the hippocampus by using real-time quantitative polymerase chain reaction. With Western blot and axon growth assay, the expression of P2rx3 was upregulated in rats subjected to TBI, and overexpression of P2rx3 promoted neurite growth of NG108 cells. Our results suggested that the DEGs (especially P2rx3) and several signaling pathways might play a pivotal role in TBI. We also provided several targeted genes related to TBI for future investigation.  相似文献   

  总被引：3，自引：0，他引：3  

Xiaoming Sun  Langlang Zhang  Darren C. J. Wong  Yi Wang  Zhenfei Zhu  Guangzhao Xu  Qingfeng Wang  Shaohua Li  Zhenchang Liang  Haiping Xin 《The Plant journal : for cell and molecular biology》2019,99(5):988-1002

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Ya Zheng  Chen Dong  Junling Yang  Yi Jin  Wenjie Zheng  Qiao Zhou  Yi Liang  Liuliu Bao  Guijuan Feng  Juan Ji  Xingmei Feng  Zhifeng Gu 《Journal of cellular physiology》2019,234(11):20662-20674

The mechanism of local inflammation and systemic injury in chronic periodontitis is complicated, in which and exosomes play an important role. In our study, we found that T helper cell 17 (Th17)/regulatory T cell (Treg) balance is destabilized in the peripheral blood of patients with periodontitis, with upregulated Th17 or downregulated Treg, respectively. Porphyromonas gingivalis lipopolysaccharide (LPS) was used to simulate the inflammatory microenvironment of chronic periodontitis. The exosomes were extracted from periodontal ligament stem cells (PDLSCs) in LPS-induced periodontitis environment, which inversely effected on CD4+ T cells under normal and inflammatory conditions. Furthermore, compared with exosomes from normal PDLSCs, lower expression of microRNA-155-5p (miR-155-5p) and higher expression of Sirtuin-1 (SIRT1) were observed in exosomes from LPS-stimulated PDLSCs. Exosomes from PDLSCs alleviated inflammatory microenvironment through Th17/Treg/miR-155-5p/SIRT1 regulatory network. This study aimed to find the “switching” factors that affected the further deterioration of periodontitis to maximally control the multiple downstream damage signal factors to further understand periodontitis and find new targets for its treatment.  相似文献