Nano Energy
·
2019
·
IF 15.548
Nan Wei,Jingsheng Cai,Ruochen Wang,Menglei Wang,Wei Lv,Haina Ci,Jingyu Sun,Zhongfan Liu
Lithium–sulfur battery is amongst the most promising next-generation energy storage technology owing to their high theoretical capacity and energy density . Nevertheless, the notorious shuttle effect of lithium polysulfides (LiPSs) seriously impedes its practical applications. Here, we report an all-CVD approach to realize the direct growth of ReS 2 @N-doped graphene (NG) heterostructure , which serves as an ultralight high-performance interlayer for elevated LiPS regulation via easy transfer onto the commercial separator. In contrast to the traditional interlayers constructed via vacuum filtration of nanostructured materials that inevitably increase the thickness and weight of the separator, our all-CVD-enabled ReS 2 @NG film possesses an area of 15 mm × 100 mm, a thickness of ~0.5 μm and a negligible areal weight of 80–90 μg cm −2 . Benefiting from the two-dimensional (2D) vertically-erected nanostructure , adsorptive ReS 2 -conductive NG interface, and favorable electrical conductivity , thus-derived ReS 2 @NG interlayer readily enhances reaction kinetics for LiPS conversion and boosts the reutilization of trapped LiPS whilst guaranteeing smooth transportation of lithium ions . Accordingly, an initial discharge capacity of 854 mAh g −1 with an average capacity decay of 0.064% per cycle after 800 cycles can be harvested at 2.0 C. Even at a high sulfur loading of 6.4 mg cm −2 , an initial areal capacity of 6.1 mAh cm −2 can be gained, which still retains 5.8 mAh cm −2 after 40 cycles at 0.1 C. This work is anticipated to shed light upon the construction of CVD-enabled versatile 2D heterostructures for enriching the interlayer design with multifunctionality and cost-effectiveness.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
界面工程
·
电池技术
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 11
·期 3
·2202195
·
IF 10.05
Xiaojing Li,Zilong Chen,Fuming Li,Fangfang Zhang,Zhihua Yang,Shilie Pan
A long-lasting challenge in ultraviolet (UV) nonlinear optical (NLO) materials design is to combine conflicting and harsh properties into one structure, including wide UV transparency, strong NLO efficiency, and moderate birefringence to realize phase-matching at short wavelength. A fluorine-directed material design strategy is adopted to accelerate the process of finding NLO materials with optimal performances. In this work, taking LiB 3 O 5 (LBO) as a maternal structure, one O atom with two F atoms is substituted and LiNaB 6 O 9 F 2 which possesses novel double interpenetrating 3 [B 6 O 9 F 2 ] ∞ networks and fluorine-directed optimal performances including enhanced birefringence and phase-matching capacity is successfully obtained. The perfect balance among deep-UV cutoff edge, large second-harmonic generation (SHG) response (1.1 × KDP), and moderate birefringence (0.067 at 1064 nm) of LiNaB 6 O 9 F 2 makes it a promising UV NLO crystal.
研究领域:
材料科学
·
晶体化学
·
非线性光学
·
功能材料
·
固体化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Pengfei Zhou,Jing Zhang,Zhennan Che,Zuhao Quan,Ju Duan,Xiaozhong Wu,Junying Weng,Jinping Zhao,Jin Zhou
P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 is considered as a promising cathode material for sodium-ion battery (SIBs) because of its high capacity and discharge potential. However, its practical use is limited by Na + /vacancy ordering and P2-O2 phase transition. Herein, a Ti 4+ /F − co-doping strategy is developed to address these issues. The optimal P2-Na 0.67 Ni 0.33 Mn 0.37 Ti 0.3 O 1.9 F 0.1 exhibits much enhanced sodium storage performance in the high voltage range of 2.0–4.4 V, including a cycling stability of 77.2% over 300 cycles at a rate of 2 C and a high-rate capability of 87.7 mAh g −1 at 6 C. Moreover, the P2-Na 0.67 Ni 0.33 Mn 0.37 Ti 0.3 O 1.9 F 0.1 delivers reversible capacities of 82.7 and 128.1 mAh g −1 at −10 and 50 °C at a rate of 2 C, respectively. The capacity retentions over 200 cycles at −10 °C is 94.2%, implying more opportunity for practical application. In-situ X-ray diffraction analysis reveals that both P2-O2 phase transitions and Na + /vacancy ordering is suppressed by Ti 4+ /F − co-doping, which resulting in fast Na + diffusion and stable phase structure. The hard carbon//P2-Na 0.67 Ni 0.33 Mn 0.37 Ti 0.3 O 1.9 F 0.1 full cell exhibits a high energy density of 310.2 Wh kg −1 and remarkable cyclability with 82.1% retention after 300 cycles at 1 C in the voltage range of 1.5–4.2 V. These results demonstrate that the co-doping Ti 4+ /F − is a promising strategy to improve the electrochemical properties of P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 , providing a facile tactic to develop high performance cathode materials for SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
Colloid and Interface Science Communications
·
2019
·
IF 1.87
Gaoqi Wang,Ding Weng,Chaolang Chen,Lei Chen,Jiadao Wang
The aim of the study was to explore the synergistic effects of nanostructure size and surface treatment of TiO 2 coatings on its wettability and bacteria adhesion. The coatings were fabricated by TiO 2 particles with a diameter ranging from 25 nm to 300 nm. The surface wettability of coatings was tuned by chemical treatment. The anti-adhesion property of as-prepared coatings was evaluated with Streptococcus mutans in two types of solutions: phosphate buffer solution (PBS) and PBS with 1 wt% sucrose. The results show that particle size and surface treatment have significant influences on the wettability (with contact angles of 0–160°) and bacterial adhesion. The coating prepared by chemically modified 25 nm particles has a superhydrophobic property, and could inhibit bacterial adhesion in aqueous solutions with sucrose or not. The study also provides a facile, universal and low-cost process to fabricate anti-adhesion coating, which is applicable for diverse of substrates.
研究领域:
生物材料学
·
纳米医学
·
表面科学
·
微生物学
·
口腔生物学
✓ 已验证
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Peng Wei,Dong Huang,Chen Luo,Yang Sui,Xi Li,Qingkun Liu,Bensheng Zhu,Chuanbo Cong,Qiong Zhou,Xiaoyu Meng
Due to its uncomplicated manufacturing procedure for large-scale industrialization and adaptable conductivity, the competitive proton exchange membrane (PEM) matrix employed is sulfonated poly (ether ether ketone). However, the conflict between the strong proton conductivity and high stability of SPEEK-based PEM constantly upsets the equilibrium; the primary chain of SPEEK will conduct more protons if additional sulfonic acid is introduced, but it also causes a high swelling ratio and lowers stability. To tackle this challenging issue, we coupled the high intrinsic proton conductivity of phosphotungstic acid (HPW) and the excellent stability of polyimide (PI) nanofibers in a single PEM. In particular, sandwich-structure hybrid membranes (PI/SPEEK + HPW) were created to reduce HPW loss under operational conditions, further improving stability. Consequently, the swelling ratio and conductivity of the premium sandwich-structure PI/SPEEK + HPW-20 were 29% and 223.4 mS cm −1 under 60 °C and 100% RH, their respective values were 8% larger than those of SPEEK. Its proton conductivity reached 170.9 mS cm −1 during 13 days of exposure under 60 °C and 100% RH, which would be 30% better than that of SPEEK over the same treatment. Protons in these membranes were transported through Grotthus and vehicle mechanism, and the establishment of an acid-rich layer at the surface among PI nanofiber with HPW/SPEEK, which was confirmed by FTIR, XPS , and TEM , is responsible for these superior performances. From our point of view, our findings might encourage more studies into the creation of high-performance PEM.
研究领域:
材料科学
·
高分子化学
·
能源材料
·
电化学
·
膜科学与技术
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2022
·Vol. 8
·期 5
·1001-1008
·
IF 8.589
Xiaoyang Wang,Chun Li,Qihan Zhou,Mingshen Li,Mushi Zheng,Junlei Qi,Xiaoqing Si,Jian Cao
One of the critical challenges for the protonic ceramic fuel cell stack is sealing electrolytes and interconnects. However, the traditional Ag CuO sealant will aggravate the oxidation along the interconnect surface and result in brittle compound layers at the BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3- δ (BZCYYb) electrolyte interface. The present work demonstrates that a silver particle interlayer with high dislocation density can be adopted to join BZCYYb electrolyte to the interconnect (AISI 441 stainless) in air instead of traditional Ag CuO sealant. Elevating temperatures result in a sufficient bonding at the Ag/BZCYYb interface, and a defect-free joint is obtained at 950 °C. Atomic bonding at Ag/BZCYYb interface is confirmed by TEM. Also, a dense and thin oxide layer (2–3 μm) is formed along the AISI 441 interface. Ag particles in the interlayer provide the main driving force for the sintering joining. The massive dislocations promote the recovery and recrystallization of the Ag interlayer, as well as the interdiffusion of BZCYYb/Ag. After aging in the wet oxidizing atmosphere at 600 °C for 300 h, joints remain intact and dense, indicating superior oxidation resistance and aging performance. Besides, the joint shear strength (25.3 MPa) is 59 % higher than that of the joint brazed by traditional Ag CuO.
研究领域:
材料科学
·
固态离子学
·
能源材料
·
电化学
·
连接技术
·
高温材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 25
·9816-9821
·
IF 8.262
Li Cheng,Qing Chang,Yu Chang,Nannan Zhang,Changyuan Tao,Zhaona Wang,Xing Fan
Hierarchical forest-like photoelectrodes were prepared by assembling nano-ZnO on an array of micro-metal dendrites, aiming to demonstrate the idea of highly efficient photon-harvesting inside a biomimetic dendrite structure. Via a facile aqueous electrochemical deposition process, the metal dendrites were deposited on both flat and wire substrates with different alignments, showing wide adaptability. A strong, broadband anti-reflection effect was observed, owing to the diffuse reflection inside the microdendrites. By increasing the dendrite height, the overall reflectivity of the metal electrode can be reduced from 75% to 45%, which could be further reduced to 12% after combining with acicular-leaf-like ZnO nanoarrays. Its applications in light-driven water splitting were successfully demonstrated. Taking advantage of the forest-like photoelectrode, we have artificially constructed an efficient photo-electrochemical system similar to plants in a forest, with photons harvested by the crown-like photoanodes in the sunshine, and synthetic reactions driven by the root-like electrode in the shadow.
研究领域:
材料科学
·
纳米科技
·
光电化学
·
可再生能源
·
仿生学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 19
·11715-11721
·
IF 4.036
Baokang Zou,Yipeng Zhan,Xiuli Xie,TongTong Zhang,Runkai Qiu,Fangming Zhu
Two salalen titanium(IV) complexes ((H-salalen)TiCl2 and (F-salalen)TiCl2) containing hydrogen and fluorine respectively on the phenolate ring close to the imine were synthesized for the copolymerization of ethylene with 1-octene to prepare poly(ethylene-co-1-octene) in the presence of methylaluminoxane (MAO). The (F-salalen)TiCl2/MAO showed higher catalytic activity and better copolymer characteristics such as a higher molecular weight, narrower molecular weight distribution, and higher 1-octene incorporation than (H-salalen)TiCl2/MAO, which revealed that the electron-withdrawing conjugated effect introduced by fluorine substituents led to improvements on catalytic performance and thermal stability. The influences of copolymerization conditions including temperature, Al/Ti molar ratios and comonomer feed ratios on the copolymerization behavior of (F-salalen)TiCl2/MAO and the copolymer microstructure were investigated in detail. Under the activation of MAO, the (F-salalen)TiCl2 could produce ultrahigh molecular weight poly(ethylene-co-1-octene) with 1-octene incorporation ratios in the range of 0.9–3.1 mol% and exhibit relatively high activity. It could be inferred that long ethylene sequences in the copolymer were segregated by the isolated 1-octene units based on the 13C NMR characterization of the copolymer. Moreover, the thermal properties and crystallization of copolymers were determined by DSC and XRD and correlated to the ethylene sequence length distribution. The reactivity ratios calculated by the triad distribution in 13C NMR revealed the random comonomer distribution in the copolymer chain.
研究领域:
高分子化学
·
配位聚合
·
催化化学
·
材料科学
·
高分子物理
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·Vol. 10
·期 6
·108837
·
IF 7.968
Yumei Jian,Ye Meng,Jie Li,Hongguo Wu,Shunmugavel Saravanamurugan,Hu Li
Photocatalytic reductive conversion of bio-derivatives to biofuels and fine chemicals is an eco-friendly and energy-saving way for biomass valorization. Herein, we developed a new and high-performance protocol for control of activity/selectivity in photocatalytic reductive upgrading of biomass to biofuels at room temperature via engineering oxygen vacancy (Ov) and manipulating the exposed crystal surfaces of the TiO 2 -based catalysts, such as efficient cascade photocatalytic hydrogenation-cyclization of ethyl levulinate to γ-valerolactone in water (up to 96% yield, TOF: 112.1 h −1 ), and the selective conversion of 5-methylfurfural to 5-methylfurfuryl alcohol (90% yield) or long carbon-chain coupling products (86% yield) in methanol, respectively. The {101} crystal plane is prone to produce more Ov in situ than the {001} and {110} crystal planes. The formation of Ov was not only beneficial to the adsorption and activation of the bio-based carbonyls, but also could enhance the migration efficiency of the photo-generated carriers and effectively adjust the semiconductor band structure of the TiO 2 -based photocatalyst to promote the visible-light absorption, thus enhancing the overall reductive conversion process, as elucidated by DFT calculations. Also, the charge distribution and adsorption intensity of different exposed crystal surfaces of the photocatalyst were able to control the selectivity of the bioproducts . In addition, the optimal Ov-TiO 2− x {101} catalyst had excellent reusability and could be reused at least five times with no obvious decrease in photocatalytic performance. The strategy of selectivity control via engineering the catalyst exposed crystal surfaces and loaded Ov provides an opportunity for multi-catalytic biomass conversion to biofuels.
研究领域:
催化化学
·
材料科学
·
能源化学
·
环境科学
·
绿色化学
·
表面科学
·
光催化
✓ 已验证
DOI
高影响因子
THIN SOLID FILMS
·
2018
·
IF 1.939
Yanqi Lv,Yanhong Li,Hongxia Sun,Yi Guo,Yanmei Li,Jinkun Tan,Xingfu Zhou
Crystalline yttrium-doped rutile TiO 2 nanorod arrays were synthesized and successfully implemented as a photoanode of perovskite solar cells . Study shows that yttrium was successfully doped and TiO 2 band gap changes from 3.07 eV to 3.02 eV. A positive shift of 100 mV in the flat-band potential (V fb ) was observed in Y-doped rutile TiO 2 nanorods. A power conversion efficiency of 7.95% and a photocurrent density of 15.13 mA/cm 2 were obtained for the doped sample. The photocurrent density is 1.47 times higher than that of the un-doped device. Incident photon-to-current conversion efficiency shows Y-doped device has a clear increase in quantum efficiency in the visible light range from 450 and 750 nm. Open circuit voltage decay measurements demonstrate the superior ability of Y-doped TiO 2 nanorod for separating electrons and holes and decreasing the recombination events. The improved performance is possibly attributed to the enhanced electron injection and transfer efficiency caused by a positive shift in V fb and a reduction in charge recombination. This study opens a door toward the improvement of photocurrent density of perovskite solar cell via an element doping route.
研究领域:
材料科学
·
纳米科技
·
能源化学
·
光电子学
·
半导体物理
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xiangyang Zhuang,Yao Zhang,Lingxiao He,Yunfeng Zhu,Quan Shi,Quan Wang,Guanzhou Song,Xiaoxiao Yan,Liquan Li
Overheating caused by exothermic effect of magnesiothermic reduction reaction is usually considered as a drawback in preparing porous silicon anode materials for Li-ion batteries. However, in the present work, thermal effect is available in facile preparation of macroporous Si by tabletting pretreatment . The released heat in magnesiothermic reaction is easily accumulated on the tablet with high density, leading to the collapse of the mesoporous structure of the precursor and formation of uniform macroporous silicon . Such macroporous silicon shows a higher initial Coulomb efficiency (86.5%) and enhanced cycling stability in comparison with mesoporous silicon prepared without tabletting treatment. XRD analysis indicates that the reaction temperature decreases to 430–435 °C (based on set temperature), much lower than that of the reaction without pretreatment. Since the structure of product has less dependency on precursor, a wide variety of precursors can be used to synthesize macroporous silicon, e.g. low cost biosilica. Being ascribed to low reaction temperature, heating rate insensitivity, less dependency on precursor, enhanced cycling performance and high initial Coulomb efficiency of the Si products, the modified magnesiothermic reduction method is promising for application in fabricating Si anode.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机合成
·
功能材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Shengyang Zhou,Yali Zhao,Jifu Zheng,Suobo Zhang
A novel polymer of intrinsic microporosity , acyl chloride-functionalized polymer of intrinsic microporosity (PIM-COCl), was obtained by hydrolysis under alkaline conditions and acylation in thionyl chloride of PIM-1. PIM-COCl is soluble in common organic solvents , and it is used for the first time for organic solvent nanofiltration (OSN). The acyl chloride groups in PIM-COCl can be further cross-linked with an amine-functionalized polyacrylonitrile (APAN) ultrafiltration membrane to form an interconnected layer, which shrinks pore size and provides better structural stability and selectivity. The PIM-COCl composite membranes exhibit high rejection and alcohol flux during OSN. Compared with the reported PIM OSN membranes , [email protected] exhibits higher rejection for crystal violet (408 g mol −1 , over 94%) in ethanol and several times higher alcohol flux. The membrane shows outstanding stability in ethanol for 14 days. PIM provides a microporous structure, while the interconnected layer maintains this structure in organic solvents via hydrogen bonding , electrostatic interactions and covalent cross-linking. Other PIMs can readily undergo acyl chloride functionalization, which provides them with high reactivity towards amine groups to form stable interconnected layers. This work offers new strategies for the design and preparation of high performance OSN membranes .
研究领域:
高分子材料科学
·
膜分离技术
·
纳米过滤
·
有机溶剂处理
·
功能化聚合物
·
化学稳定性
·
材料化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）