Nature Communications
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2023
·Vol. 14
·期 1
·1-12
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IF 16.6
Zhang Jiyu,Yan Yongliang,Wang Xin,Cui Yanyan,Zhang Zhengfeng,Wang Sen,Xie Zhengkun,Yan Pengfei,Chen Weihua
Non-aqueous sodium-ion batteries (SiBs) are a viable electrochemical energy storage system for grid storage. However, the practical development of SiBs is hindered mainly by the sluggish kinetics and interfacial instability of positive-electrode active materials, such as polyanion-type iron-based sulfates, at high voltage. Here, to circumvent these issues, we proposed the multiscale interface engineering of Na 2.26 Fe 1.87 (SO 4 ) 3 , where bulk heterostructure and exposed crystal plane were tuned to improve the Na-ion storage performance. Physicochemical characterizations and theoretical calculations suggested that the heterostructure of Na 6 Fe(SO 4 ) 4 phase facilitated ionic kinetics by densifying Na-ion migration channels and lowering energy barriers. The (11-2) plane of Na 2.26 Fe 1.87 (SO 4 ) 3 promoted the adsorption of the electrolyte solution ClO 4 − anions and fluoroethylene carbonate molecules, which formed an inorganic-rich Na-ion conductive interphase at the positive electrode. When tested in combination with a presodiated FeS/carbon-based negative electrode in laboratory- scale single-layer pouch cell configuration, the Na 2.26 Fe 1.87 (SO 4 ) 3 -based positive electrode enables an initial discharge capacity of about 83.9 mAh g −1 , an average cell discharge voltage of 2.35 V and a specific capacity retention of around 97% after 40 cycles at 24 mA g −1 and 25 °C.
研究领域:
电化学
·
材料科学
·
能量存储
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bin Hu,An-shuai Cheng,Yang Li,Yao-bing Huang,Ji Liu,Bing Zhang,Kai Li,Li Zhao,Ti-peng Wang,Qiang Lu
Selective preparation of value-added products via fast pyrolysis is a sustainable way for biomass utilization. We developed a novel strategy, oxalic acid-assisted fast pyrolysis (OAFP) of cellulose, which achieved the selective production of a promising anhydrosugar, 1,4:3,6-dianhydro-α- d -glucopyranose (DGP), for the first time. Effects of temperature and the mass ratio of cellulose-to-oxalic acid (Cell/OA) in their solid mixture were explored. The yield of DGP could be up to 14.0 wt% (based on cellulose) at 400 °C and the Cell/OA mass ratio of 1:9 with a lab-scale setup, about 200 times higher than that from fast pyrolysis of pure cellulose. According to the experiments and density functional theory (DFT) calculations, it was OA rather than its pyrolysis vapors (mainly formic acid) that played the predominant role in the selective generation of DGP, where OA acted as a reactant and a catalyst-like material at the same time. The formation of DGP competed with that of levoglucosan (LG), the most typical product in the fast pyrolysis of pure cellulose, and a small amount of DGP came from the secondary conversion of LG. The esterification of free hydroxyl at C3 or C6 position with OA determined the selective generation of DGP by promoting the formation of the C1 = C2 bond and the 3,6-acetal ring, and the generation of the 1,6-acetal ring was inhibited correspondingly which led to the decrease of LG. In addition, the OAFP process also showed the potential for poly-generation of value-added chemicals, syngas, and char.
研究领域:
化学工程
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生物质转化
·
催化
·
可持续化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Peng Zhang,Xiaotong Yang,Tong Wang,Nobuyuki Imanishi,Osamu Yamamoto,Miao Wang
We demonstrate a novel rechargeable energy storage system having a metallic lithium negative electrode and a liquid–solid hybrid positive electrode of Fe 3+ /Fe 2+ /Fe in N,N-Dimethylformamide, which are separated by an impermeable NASICON–type Li 1.4 Al 0.4 Ge 0.2 Ti 1.4 (PO 4 ) 3 –epoxy resin composite film with a lithium ion conductivity of ca. 5.0 × 10 −4 S cm −1 . The discharge curve for the battery shows two plateaus. The first plateau corresponds to Li + FeCl 3 = LiCl + FeCl 2 , while the second one is associated with 2 Li + FeCl 2 = 2 LiCl + Fe. In the process of reduction of Fe 3+ to Fe 2+ , it delivers a stable discharge capacity of ca. 110 mAh g FeCl3 −1 with a Coulombic efficiency higher than 95% and is capable of enduring over 60 circles at a high current density of 1.0 mA cm −2 without any catalyst. Furthermore, a stable discharge capacity up to ca. 455 mAh g FeCl3 −1 is achieved for conversion of FeCl 3 /FeCl 2 /Fe with a three–electron reaction. This work demonstrates a proof of feasibility of hybrid liquid–solid hybrid positive electrode, since these reactions are reversible confirmed by x–ray diffraction patterns and EDX mapping test.
研究领域:
材料科学
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电化学
·
能源存储系统
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电池技术
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产品关联
DOI
高影响因子
Materials Today Bio
·
2022
·
IF 10.761
Qing Li,Wenbin Liu,Wen Hou,Xiaopei Wu,Wenying Wei,Jiawei Liu,Yihe Hu,Honglian Dai
The abundant neurovascular network in the periosteal fibrous layer is essential for regulating bone homeostasis and repairing bone defects. However, the majority of the current studies only focus on the structure or function, and most of them merely involve osteogenesis and angiogenesis, lacking an in-depth study of periosteal neurogenesis. In this study, a photothermal double-layer biomimetic periosteum with neurovascular coupling was proposed. The outer layer of biomimetic periosteum is a conventional electrospinning membrane to prevent soft tissue invasion, and the inner layer is an oriented nanofiber membrane to promote cell recruitment and angiogenesis. From the perspective of functional bionics, based on the whitlockite (WH) similar to bone composition, we doped Nd (the trivalent form of neodymium element) in it as the inducing element of photothermal response to prepare photothermal whitlockite ( [email protected] ). The sustained release of Mg 2+ in [email protected] can effectively promote the up-regulation of nerve growth factor (NGF) and vascular endothelial growth factor (VEGF). The release of Ca 2+ and PO 4 3− ions and photothermal osteogenesis jointly promote bone regeneration. Under the combined effect of structure and function, the formation of nerves, blood vessels, and related collagens greatly simulates the microenvironment of extracellular matrix and periosteum regeneration and ultimately promotes bone regeneration. In this study, physical and chemical characterization proved that the bionic periosteum has good flexibility and operability. The in vitro cell experiment and in vivo calvarial defect model verified that PPCL/ [email protected] biomimetic periosteum had excellent bone tissue regeneration function compared with other groups. Finally, PPCL/ [email protected] provides a new idea for the design of bionic periosteum.
研究领域:
生物医学工程
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组织工程
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生物材料
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再生医学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）