Journal of Energy Chemistry
·
2020
·
IF 7.216
Jinxing Yu,Xiaoxiang Xu
Cr doped Ruddlesden-Popper compound Sr 2 TiO 4 has been successfully modified by fluorine to form a new compound Sr 2 Ti 0.95 Cr 0.05 O 3 F 2 . Structure analysis suggests two types of fluorine in the structure of this new compound, i.e. intralayer and interlayer F, which induce strong built-in electric field within this layered compound. The electric field stems from uneven distribution of F atoms on the two sides of perovskite layers therefore leads to charge disproportionation . DFT calculations suggest that this unique structural feature is highly beneficial for charge dissociations as it breaks the coplanar settlement of conduction band minimum and valence band maximum whilst maintains the 2D charge transportation properties. This is clearly demonstrated by the superior photocatalytic activities of Sr 2 Ti 0.95 Cr 0.05 O 3 F 2 for hydrogen production from water. Apparent quantum efficiency (AQE) as high as 1.16% at 420 ± 20 nm has been achieved which stands as the highest AQE reported on Sr 2 TiO 4 to date. Photoelectrochemical (PEC) analysis confirms improved charge separation conditions and prolonged charge lifetime.
研究领域:
材料化学
·
光催化
·
能源化学
·
物理化学
·
无机功能材料
·
太阳能转化
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Hao Dong,Huan Tang,Xinxing Shi,Wenlan Yang,Wenjing Chen,Han Li,Yu Zhao,Zhengyong Zhang,Ming Hua
Efficient elimination of fluoride from wastewater is an urgent need for ensuring water safety. In the present study, a stable and reusable nanocomposite (NCO@PAE) was synthesized by impregnating nanosized cerium oxides (NCO) inside a porous polystyrene anion exchanger (PAE) host for efficient fluoride removal from wastewater. The newly fabricated NCO@PAE exhibited excellent resistance to acid and alkali environment, allowing it to be utilized in a wide pH range (2–12). Fluoride uptake onto NCO@PAE was a pH-dependent process, which could reach the maximum capacity at pH 3.0. Compared with its host PAE , NCO@PAE showed conspicuous adsorption affinity towards fluoride in the coexistence of other competing anions at high concentrations. Adsorption kinetics confirmed its high efficiency for achieving equilibrium within 120 min. Fixed-bed adsorption runs demonstrated that the effective processing capacity of NCO@PAE for synthetic fluoride-containing wastewater (initial fluoride 2.5 mg/L) was about ~330 BV (bed volume), while only 22 BV for the host PAE . The exhausted NCO@PAE could be effectively revived by a simple in-situ desorption method for long-term cycle operation without conspicuous capacity loss. All the results indicated that NCO@PAE is a reliable and promising adsorbent for water defluoridation.
研究领域:
环境科学
·
水处理技术
·
材料科学
·
吸附化学
·
环境功能材料
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Jing Li,Sanming Li,Zhonggui He
In the present work, molecular imprinting silica xerogel (MISX) with selective recognition function aiming to regulate drug therapy was synthesized using biomimetic method with poly(ethyleneimine)s (PEIs) as the polymer template and levorotatory ofloxacin (LOFL) as recognition template. Ultraviolet spectroscopy wavelength scanning was used to test the removal process of LOFL, and characteristics of selective loading ofloxacin (OFL) into MISX were investigated using Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC). Molecular recognition functionality of MISX was intensively studied, including OFL loading and release. The results suggested that MISX possessed ability to recognize and selectively adsorb LOFL into MISX in OFL aqueous solution. Amorphous phase of adsorbed molecules contributed to molecular recognition because amorphous state increased the stability of LOFL that were selectively adsorbed into MISX, which induced stronger hydrogen bonding formed between LOFL and MISX so as to improve LOFL recognition ability. In vitro release revealed that OFL-MISX tablet initially released LOFL and later gradually OFL into dissolution medium. Thus conversion of drug release with different pharmacological activity had special value in delivering systems.
研究领域:
药剂学
·
药物化学
·
纳米医学
·
生物材料
·
分子识别
·
药物递送系统
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qi Li,Xiaoyu Zhang,Jian Peng,Zhihao Wang,Zhixiang Rao,Yuyu Li,Zhen Li,Chun Fang,Jiantao Han,Yunhui Huang
Poly(ethylene oxide) (PEO)-based polymer electrolytes have been widely studied as a result of their flexibility, excellent interface contact, and high compatibility with a lithium metal anode. Owing to the poor oxidation resistance of ethers, however, the PEO-based electrolytes are only compatible with low-voltage cathodes, which limits their energy density. Here, a high-voltage stable solid-state interface layer based on polyfluoroalkyl acrylate was constructed via in situ solvent-free bulk electropolymerization between the LiNi0.8Mn0.1Co0.1O2 (NCM811) cathode and the PEO-based solid polymer electrolyte. The electrochemical oxidation window of the as-synthesized electrolyte was therefore expanded from 4.3 V for the PEO-based matrix electrolyte to 5.1 V, and the ionic conductivity was improved to 1.02 × 10–4 S cm–1 at ambient temperature and 4.72 × 10–4 S cm–1 at 60 °C as a result of the improved Li+ migration. This fabrication process for the interface buffer layer by an in situ electrochemical process provides an innovative and universal interface engineering strategy for high-performance and high-energy-density solid-state batteries, which has not been explicitly discussed before, paving the way toward the large-scale production of the next generation of solid-state lithium batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
电池技术
·
高分子化学
·
界面科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yu Wang,Xianyou Wang,Xiaolong Li,Ruizhi Yu,Manfang Chen,Ke Tang,Xiaohui Zhang
Due to the attractive advantage of safety and cost of sodium-ion batteries, lithium-ion batteries can be replaced by sodium-ion batteries with the ever-increasing demand of large-scale energy storage systems. However, short cycle life and poor rate performance restrict sodium-ion batteries further commercial application. Cathode materials are one of the most important components of sodium-ion batteries, which have an unparalleled effect on the electrochemical performance of sodium-ion batteries. Herein, the novel P3-Na 0.65 Mn 0.75 Ni 0.25 O 2 cathode material doped by non-metal elements is synthesized via hydrothermal method and subsequent low temperature annealing process. The as-prepared P3-Na 0.65 Mn 0.75 Ni 0.25 O 2 shows excellent electrochemical performance due to doping of non-metal elements. It can be found that fluorine doped Na 0.65 Mn 0.75 Ni 0.25 F 0.1 O 1.9 can distinctly suppress P3-O1 phase transition and deliver a higher reversible capacity of 163.7 mAh g −1 at 0.1 C, while boron doped Na 0.65 Mn 0.75 Ni 0.25 B 0.1 O 2 transforms from P3 phase to a more stable P2 phase and exhibits remarkable cycle life and rate performance. Therefore, this new strategy doping by means of non-metal elements provides a significant exploration for the development of the high capacity electrode materials of sodium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Lingzhi Guo,Hongyan He,Yurong Ren,Chao Wang,Mingqi Li
Core-shell F-doped carbon coated SiO composites with interspaces and some small voids (SiO@F-doped C) are successfully fabricated using bulk SiO as starting material. With the assistance of polytetrafluoroethylene (PTFE), both etching and carbon coating of SiO are firstly performed in a single step, which largely lowers the production cost of materials. The SiO@F-doped C composite obtained by annealing the mixture of SiO and PTFE with a mass ratio of 5:3 at 650 °C shows the highest stable discharge capacity with excellent cycling stability. It delivers a stable discharge capacity of about 975 mAh g −1 at a current density of 100 mA g −1 . Even after the current density increases to 1600 mA g −1 , a stable discharge capacity of about 553 mAh g −1 can be achieved. At a current density of 400 mA g −1 , the composite maintains a discharge capacity of 752 mAh g −1 after 350 cycles, the retention of which is 99.2% versus that in the second cycle. Compared with the annealed SiO, in addition to higher conductivity, the ions diffusion rate of the SiO@F-doped C composite increases 2.94 times while the volume expansion falls by more than half, which should be responsible for its significantly enhanced electrochemical performance.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Han Jin,Huayun Liu,Hao Cheng,Peng Zhang,Miao Wang
Commercialization of the LMBs is subject to two formidable technical challenges, the instability of Li metal against all the organic solvents , and the short circuit caused by the dendritic lithium deposits. Lithium Bis(fluorosulfonyl)imide salt has exhibited an impressive performance for lithium-dendrite suppression and cycling efficiency improving at low current densities. Here, we use LiNO 3 as the film-forming additive for further passivation of the Li metal anodes . Following the addition of LiNO 3 , the cycling performance of the cells with 2.5 M LiFSI-0.75 M LiNO 3 /DOL as electrolyte at high currents is improved obviously. The symmetrical lithium–metal cells can be cycled for 1000 cycles with more than 1000 h at 5 mA cm −2 with a stripping/plating capacity of 2 mAh cm −2 . Moreover, the Li/Cu cell could be cycled for 400 cycles with a stable and high average Coulombic efficiency (CE) of 98.8% at 3 mA cm −2 with a capacity of 2 mAh cm −2 . Besides, the electrolyte contains an well adaptability to the electrode of LiFePO 4 and improves the cycling stability of the lithium metal. Consequently, LiNO 3 demonstrates an excellent performance as a film-forming additive in the LiFSI/DOL electrolyte for further passivation of the Li metal anodes.
研究领域:
电化学
·
能源材料
·
电池技术
·
界面化学
·
电极材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 11
·3351-3357
·
IF 4
Keke Shen,Di Wang,Xinzhi Ma,Kaixin Zhao,Qi Jin,Junpeng Xiao,Yong Cai,Yufei Zhang,Lili Wu,Xitian Zhang
Lithium, with its high theoretical capacity and low potential, has been widely investigated as the anode in energy storage/conversion devices. However, their commercial applications always suffer from undesired dendrite growth, which forms in the charging process and may puncture the separator, leading to short cycle lives and even security problems. Herein, by an in situ displacement reaction using SnF2 at room temperature, we constructed an artificial solid electrolyte interface (ASEI) of LiF/Li–Sn outside the Li anode. This hybrid strategy can induce a synergy between the high Li+ conductivity of the Li–Sn alloy and good electrical insulation of LiF. Moreover, extreme synergy can be achieved by moderating the thickness of the LiF/Li–Sn ASEI, guiding dendrite-free lithium plating and stripping. As a result, a Li//LiFePO4 battery that is assembled from the LiF/Li–Sn ASEI-engineered Li anode can obtain 1000 cycled lives with 86.3% capacity retention under a charge/discharge rate of 5 C. This work provides an alternative way to construct dendrite-free lithium metal anodes, which significantly benefit the cycle lives of LMBs.
研究领域:
电化学
·
材料科学
·
能源存储
·
纳米材料
·
界面化学
·
电池技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Zhenlong Yan,Weiqu Liu,Nan Gao,Honglei Wang,Kui Su
A novel functional fluorinated siloxane graft copolymer bearing with vinyl end-groups was synthesized from dihydroxypropyl-terminated poly(dimethylsiloxane) (PDMS), dicarboxyl terminated poly(2,2,3,4,4,4-hexafluorobutyl acrylate) oligomer (CTHFA), 2,4-toluene diissocyanate (TDI) and 2-hydroxyethyl methacrylate (HEMA). The chemical structure was characterized by FT-IR and GPC. The effect of concentration of the vinyl-capped fluorosilicone graft copolymer (Vi-PFSi) on the surface, thermal properties, dielectric and tribological properties of UV-cured films was investigated. Contact angles and surface energies showed that the high hydrophobic and oleophobic surfaces were obtained by incorporation of Vi-PFSi at very low amount (0.5 wt%). X-ray photoelectron spectroscopy (XPS) evidenced that the fluorinated and siloxane moiety selectively migrated to the outermost surface of UV-cured film, thus reduced its surface energy from 45.42 to 15.40 mN/m 2 without affecting its bulk properties. The morphology of fracture surface of modified film exhibited rough fracture surface only at the outermost surface, revealing fluorinated and siloxane groups migrated toward air-side surface. The dielectric constants decreased from 5.32 (1 MHz) for bisphenol-A epoxy methacrylate (EMA) to 2.82 (1 MHz) for modified film when the Vi-PFSi copolymer concentration increased from 0 to 0.8 wt%. Tribological results from abrasion tester suggested that the Vi-PFSi could obviously reduce the abrasion weight loss of modified films.
研究领域:
高分子化学
·
材料科学
·
表面工程
·
介电材料
·
摩擦学
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 82
·期 2
·242-254
·
IF 1.638
Wang Jinpeng,Zhang Ming,Zhou Runjuan,Li Jiyuan,Zhao Wei,Zhou Jinghong
Using waste pomelo peel as raw material, pomelo peel-based biochar (BC) was prepared by pyrolysis at 400 °C, and the pomelo peel-based biochar was prepared by loading γ -Fe 2 O 3 onto the surface of the pomelo peel-based biochar by unlimited oxygen chemical precipitation. The results showed that the pomelo peel biochar loaded with γ -Fe 2 O 3 had higher specific surface area and larger pore volume. The load of γ -Fe 2 O 3 gives γ -Fe 2 O 3 @BC excellent magnetic separation ability, and its magnetic saturation intensity is as high as 30.60 emu/g. BC and γ -Fe 2 O 3 @BC were applied to remove norfloxacin (NOR) from a water body. It was found that the adsorption of NOR by both of them followed the pseudo-second-order kinetic model. The adsorption isotherm mainly conforms to the Sips model, and the adsorption process of NOR is a spontaneous endothermic reaction. The pH and ionic strength have a great influence on the adsorption of NOR by BC and γ -Fe 2 O 3 @BC, and they play a role mainly by influencing the morphology of NOR in water. The adsorption mechanism showed that cation exchange and hydrogen bonding were the main forces for BC to adsorb NOR. Moreover, the γ -Fe 2 O 3 particles enhanced the hydrophobicity of the pomelo peel-based biochar, making the hydrophobicity become the main force for the adsorption of NOR by the γ -Fe 2 O 3 @BC. The adsorption–desorption experiment showed that after four cycles of recycling, the adsorption capacity of γ -Fe 2 O 3 @BC for NOR was still up to 61.43% of the initial adsorption capacity, and it had a good recycling property.
研究领域:
环境科学
·
材料科学
·
水污染控制
·
环境功能材料
·
吸附化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3381-3393
·
IF 3.5
Zhang Feng,Wang Hao
Exorbitant cost and limited availability of platinum-based electrocatalysts for the oxygen reduction reaction (ORR) in metal–air batteries and alkaline fuel cells pose significant obstacles to the large-scale commercialization of these clean-energy technologies. Herein, we employed a cost-effective and sustainable bacterial cellulose biomass as the precursor to prepare a nitrogen and fluorine codoped metal-free ORR electrocatalyst (BCC-NF-900) by direct pyrolysis regulation. The BCC-NF-900 inherited the three-dimensional framework of bacterial cellulose, exhibiting a robust porous structure with a Brunauer–Emmett–Teller surface area of 196.9 m 2 ·g −1 . The pyridinic N (0.6 at%) and semi-ionic F (0.34 at%) species formed in the inert sp2 carbon skeletons synergistically regulated the electron spin and charge density of the adjacent C atoms. Such rational combination of a rapid transport pathway and effective active site led to high ORR activity (onset potential 0.89 V vs. RHE), methanol resistance, and electrochemical stability (merely 6.9% current loss) in alkaline electrolyte. Importantly, compared to the mere F-doped BCC-F-900 (onset potential 0.82 V vs. RHE) and N-doped BCC-N-900 (onset potential 0.77 V vs. RHE) catalysts, the BCC-NF-900 catalyst exhibited a markedly enhanced ORR performance, as evidenced by the measured onset potential. This study provides an available reference for the design of efficient metal-free catalysts for ORR, presenting a promising alternative to Pt/C catalysts in metal–air batteries and alkaline fuel cells.
研究领域:
材料科学
·
电化学
·
能源技术
·
纳米技术
·
环境科学
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2017
·Vol. 7
·期 15
·1700087
·
IF 16.721
Ting Jin,Yongchang Liu,Yang Li,Kangzhe Cao,Xiaojun Wang,Lifang Jiao
NaVPO 4 F has received a great deal of attention as cathode material for Na-ion batteries due to its high theoretical capacity (143 mA h g −1 ), high voltage platform, and structural stability. Novel NaVPO 4 F/C nanofibers are successfully prepared via a feasible electrospinning method and subsequent heat treatment as self-standing cathode for Na-ion batteries. Based on the morphological and microstructural characterization, it can be seen that the NaVPO 4 F/C nanofibers are smooth and continuous with NaVPO 4 F nanoparticles (≈6 nm) embedded in porous carbon matrix. For Na-storage, this electrode exhibits extraordinary electrochemical performance: a high capacity (126.3 mA h g −1 at 1 C), a superior rate capability (61.2 mA h g −1 at 50 C), and ultralong cyclability (96.5% capacity retention after 1000 cycles at 2 C). 1D NaVPO 4 F/C nanofibers that interlink into 3D conductive network improve the conductivity of NaVPO 4 F, and effectively restrain the aggregation of NaVPO 4 F particles during charge/discharge process, leading to the high performance.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
·
无机非金属材料
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）