DALTON TRANSACTIONS
·
2016
·Vol. 46
·期 1
·193-199
·
IF 4.177
Dongdong Xu,Fangfang Zhang,Yanzhou Sun,Zhihua Yang,Binghua Lei,Lili Liu,Shilie Pan
A new rare-earth borate LiRb2LaB2O6 (LB-1) has been synthesized using a high-temperature solution method. Interestingly, it shares its topological structure with the famous porous material MOF-5, which is formed from Zn4O(BDC)3 (BDC = 1,4-benzenedicarboxylate). The nodes [OZn4] and organic linkers [BDC] of MOF-5 are carefully substituted with La3+ rare-earth cations and the inorganic linkers [BO3] and [LiO4], respectively, in order to construct a pure inorganic open framework. LB-1 exhibits good thermal and water stability. Moreover, it possesses a short cut-off edge (<190 nm) and moderate birefringence (exp. 0.040@589.5 nm, cal. 0.038@589.5 nm). Further insights into the cut-off edge were given by first-principles calculations. The factors that influence the birefringence of LB-1 were discussed in view of the spatial arrangement of the [BO3] anionic groups.
研究领域:
无机化学
·
材料科学
·
晶体工程
·
光学材料
·
固体化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 19
·6740-6746
·
IF 0
Weining Sun,Xiaofeng Lu,Yan Tong,Junyu Lei,Guangdi Nie,Ce Wang
In this report, a palladium/polypyrrole/polyacrylonitrile (Pd/PPy/PAN) composite nanofiber membranes was synthesized by a one-pot redox polymerization process between pyrrole monomers and Na2PdCl4 in the presence of electrospun PAN nanofibers, without the introduction of any other surfactants or reductants. The as-prepared Pd/PPy/PAN nanofiber membrane exhibited good catalytic performance towards hydrogen generation from the hydrolysis of ammonia borane (AB). The apparent activation energy (Ea) was calculated to be about 33.5 kJ mol−1. In addition, the Pd nanoparticles (Pd NPs) were encapsulated in PPy layers on the surface of the PAN nanofibers, enabling the catalyst to be stable against poisoning and easily separated from the suspension system. The catalytic activity does not weaken after five cycles. This study indicated that the obtained Pd/PPy/PAN composite nanofiber membrane could be applied as an alternative in exploring new catalysts for hydrogen generation, as hydrogen is an important fuel as a clean power source.
研究领域:
材料化学
·
纳米催化
·
能源材料
·
高分子科学
·
氢能源
✓ 已验证
DOI
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
Analytical Methods
·
2016
·Vol. 8
·期 5
·1127-1134
·
IF 1.915
Ning An,Lijuan Wang,Jingjing Zhao,Lili Lv,Ning Wang,Huaizhong Guo
An interesting study on chiral nonaqueous capillary electrophoresis (NACE) was developed in this paper. Two new chiral selectors, a lactobionic acid–boric acid complex and a D-(+)-xylose–boric acid complex were respectively in situ synthesized in nonaqueous background electrolytes (BGEs) containing methanol and triethylamine. They were found to be applicable for the enantioseparation of fourteen amino alcohols including eight β-blockers and six β-agonists by NACE. In order to achieve good enantioseparation, the effects of chiral selector concentration, BGE composition, capillary temperature, and applied voltage were systematically investigated. Under the optimized conditions, most of the tested amino alcohols achieved good chiral resolution. The effects of the molecular structures of chiral selectors and analytes on enantioseparation were discussed in terms of molecular interactions. The method was proved to be suitable for routine analysis of propranolol enantiomers, since it provided satisfactory results during linearity, precision, and accuracy (recovery) studies using the lactobionic acid–boric acid complex as the chiral selector. Good linearity was obtained in the range of 1.0–100.0 μg mL−1 for each propranolol enantiomer and the recoveries for them ranged from 96.4% to 105.9% with the relative standard deviation (RSD) less than 6.4%. This chiral NACE method was applied for the determination of propranolol enantiomers from tablets and the average contents were 101.3% for (R)-propranolol and 98.5% for (S)-propranolol (n = 5).
研究领域:
分析化学
·
药物分析
·
手性分离
·
电泳技术
·
药物代谢
·
分子识别
·
药剂学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Hao Li,Qingni Yu,Bin Yang,Zhongjian Li,Lecheng Lei
Galvanostatic anodic oxidation of artificial human urine (AHU) was carried out by using boron doped diamond (BDD) and IrO 2 electrodes respectively. It was found that organic compounds in urine could be almost completely mineralized in a few hours and ammonia may be oxidized into N 2 by the electro-catalytic process. However, the oxidation processes were highly dependent on the electrode materials. On the non-active BDD electrode complete oxidation occurred, and the final oxidation products of inorganic ions, including ClO 4 − and NO 3 − , were formed. Whereas on the active IrO 2 electrode, the final products generated and left in solution were highly toxic substances, including N 2 H 4 and NO 2 − , because the oxidizing activity on the IrO 2 electrode surface is relatively low. The pH values during the degradation process were monitored and the corresponding degradation mechanisms and pathways on both electrodes are proposed based upon the measured inorganic intermediates.
研究领域:
环境科学
·
电化学
·
水处理技术
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 47
·2203588
·
IF 15.153
Jinli Fan,Chengyu Fu,Rikai Liang,Haiyang Lv,Chaosong Fang,Yanhui Guo,Weiju Hao
Mild construction of highly efficient and durable practical electrodes for overall water splitting (OWS) at industrial-grade current density is currently a significant challenge. Herein, metal–organic framework (MOF) materials are grown in situ on the surface of carbon cloth (CC) at 25 °C, and quickly “interspersed” by cobalt–boron (Co–B) via electroless plating for 30 min to obtain a highly efficient and stable CoB@MOF@CC self-supporting electrode. Owing to the large specific surface area, abundant active sites, and porous structure, the MOF-based CC modified by bamboo leaf-like ultrathin CoB has remarkable electrochemical catalysis efficiency. The CoB@MOF@CC electrode exhibits excellent performance during the hydrogen evolution reaction (η 10 = 57 mV, η 500 = 266 mV) and oxygen evolution reaction (η 10 = 209 mV, η 500 = 423 mV) in alkaline simulated seawater, and is durable for 2500 h at 500 mA cm −2 . The OWS performance is obviously enhanced by employing the prepared electrode, which only requires 1.49 V to achieve 10 mA cm −2 and is durable for over 360 h at industrial-grade current densities in alkaline high-salt, real seawater, rainwater, and urea electrolytes.
研究领域:
材料科学
·
电化学
·
能量转换
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2015
·Vol. 73
·期 2
·329-336
·
IF 1.106
Zha Yiming,Wang Tianlin
In this work, boron nitride nanoplates (BNNPs) supported nanoscale zero-valent iron (nZVI) was prepared through facile liquid-phase chemical reduction of ferric ion by borohydride under ambient conditions in the presence of BNNPs. The nZVI@BNNPs hybrids were characterized by scanning electron microscopy, X-ray diffraction and magnetic properties measurement. The hybrid material was evaluated for decolorization of a common azo dye, methyl orange (MO), with the assistance of ultrasonic irradiation. Results exhibited that a complete decolorization of 100 mg/L MO was achieved within 6 min using nZVI@BNNPs as the active material. Compared with bare nZVI and BNNPs, nZVI@BNNPs provided a faster reaction process for MO decolorization. The kinetic rate constants of MO decolorization reached 0.8175 min −1 under ultrasound-assisted condition due to the synergistic effect of ultrasonic irradiation. Fluorescence spectrum experiment confirmed that hydroxyl radicals could be generated in the system combined nZVI with ultrasonic irradiation, and as a result, hydroxyl radicals would contribute to the decolorization process of MO.
研究领域:
环境化学
·
纳米材料科学
·
水污染治理
·
声化学
·
环境功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Ningfang Zhou,Gang Luo,Wei Qin,Chun Wu,Chuankun Jia
Heteroatom doping is one of the feasible strategies to improve electrode efficiency. Meanwhile, graphene helps to optimize structure and improve conductivity of the electrode. Here, we synthesized a composite of boron-doped cobalt oxide nanorods coupled with reduced graphene oxide by a one-step hydrothermal method and investigated its electrochemical performance for sodium ion storage. Because of the activated boron and conductive graphene, the assembled sodium-ion battery shows excellent cycling stability with a high initial reversible capacity of 424.8 mAh g −1 , which is maintained as high as 444.2 mAh g −1 after 50 cycles at a current density of 100 mA g −1 . The electrodes also exhibit excellent rate performance with 270.5 mAh g −1 at 2000 mA g −1 , and retain 96% of the reversible capacity upon recovery from 100 mA g −1 . This study shows that boron doping can increase the capacity of cobalt oxides and graphene can stabilize structure and improve conductivity of the active electrode material, which are essential for achieving satisfactory electrochemical performance. Therefore, the doping of boron and introduction of graphene may be one of the promising means to optimize the electrochemical performance of anode materials .
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Ruichong Chen,Jianqi Qi,Lin Su,Qiwu Shi,Xiaofeng Guo,Di Wu,Tiecheng Lu,Zhijun Liao
In this work, we report a rapid, simple and controllable approach to prepare B 4 C ceramic double-curvature shells by dropping the coating slurry on a molybdenum (Mo) substrate. The B 4 C slurry finally forms a nearly uniform spherical thin shell on the Mo substrates after drainage and curing process. We discovered that the uniformity and the wall thickness of the thin shell structure are controlled by the curing time and the viscosity of the slurry, respectively. This novel fabrication method not only provides an alternative way to prepare B 4 C ceramic double-curvature shells for the potential application as an ICF capsule, but also sheds light on the uniformity control of other ceramic double-curvature thin shells.
研究领域:
材料科学
·
核聚变工程
·
先进陶瓷制备
·
表面涂层技术
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jing Jiang,Jiayi Zhang,Baihao Wu,Sheng Tu
The regulation of the metal-support interaction in heterogeneous catalysts can promote the activation of reactants, which is beneficial for the hydrolytic dehydrogenation reaction. Herein, the hydrolytic dehydrogenation of dimethylamine borane (DMAB) is systematically studied on the oxygen vacancy (O v ) enriched Pt-Co 3 O 4 heterogeneous catalyst with the metal-support interaction. It is found that the metallic Pt site facilitates the adsorption of DMAB molecules and the O v on Co 3 O 4 support as an electron-rich center cooperates with the adjacent Pt site to dissociate water molecules. The in situ Raman and attenuated total reflectance (ATR)-Fourier transform infrared (FTIR) spectroscopy reveal the effective activation and cleavage of the O-H in water and the B-H in DMAB over the Pt-Co 3 O 4 catalyst. The optimal Pt-Co 3 O 4 catalyst exhibits the extraordinary activity for the catalytic hydrolysis of DMAB at 303 K, delivering a high specific hydrogen generation rate (64063 mL min −1 g pt −1 ) and a competitive turnover frequency (TOF, 23880 mol H2 mol Pt −1 h −1 ). This performance outperforms most of the reported heterogeneous catalysts for DMAB dehydrogenation . More importantly, the Pt-Co 3 O 4 catalyst achieves the desirable on-demand hydrogen production by using special chemical switches. This finding provides the fundamental understanding of metal-oxide systems with the collaborative interfacial catalysis for boosting DMAB dehydrogenation .
研究领域:
催化化学
·
纳米材料科学
·
能源化学
·
表面科学
·
多相催化
·
氢能存储与释放
✓ 已验证
DOI
高影响因子
Journal of Zhejiang University-SCIENCE A
·
2016
·Vol. 17
·期 2
·155-162
·
IF 0.941
Zhao Xin-yue,Wang Jing-lun,Luo Hao,Yao Hu-rong,Ouyang Chu-ying,Zhang Ling-zhi
A novel organosilicon-based ionic plastic crystal, N,N,N ,-diethylmethyl- N -[(trimethylsilyl)methyl]ammonium bistrifluoromethane sulfonimide ([DTMA][TFSI]) was designed and synthesized as solid-state electrolyte for lithium-ion batteries. The chemical structure and the physical and electrochemical properties were characterized in detail. The ionic conductivity of [DTMA][TFSI] was improved significantly by doping with lithium oxalyldifluoroborate (LiODFB) and propylene carbonate (PC). An optimized plastic crystal composite ([DTMA][TFSI]:LiODFB:PC=8:1:1 in molar ratio) as a solid-state electrolyte exhibited a decent cycling stability in LiFePO 4 /Li half-cell, with a specific discharge capacity of 144 mA·h/g and capacity retention of 94% after 50 cycles at C/20.
研究领域:
材料科学
·
电化学
·
能源存储
·
固体离子学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jing Jiang,Wei Wei,Zhen Ren,Yang Luo,Xinzhi Wang,Ying Xu,Mingming Chang,Lunhong Ai
Developing efficient catalysts for the dehydrogenation of ammonia borane (AB) is important for the safe storage and controlled release of hydrogen, but it is a challenging task. In this study, we designed a robust Ru-Co 3 O 4 catalyst using the Mott-Schottky effect to induce favorable charge rearrangement. The self-created electron-rich Co 3 O 4 and electron-deficient Ru sites at heterointerfaces are indispensable for the activation of the B-H bond in NH 3 BH 3 and the O H bond in H 2 O, respectively. The synergistic electronic interaction between the electron-rich Co 3 O 4 and electron-deficient Ru sites at the heterointerfaces resulted in an optimal Ru-Co 3 O 4 heterostructure that exhibited outstanding catalytic activity for the hydrolysis of AB in the presence of NaOH. The heterostructure had an extremely high hydrogen generation rate (HGR) of 12238 mL min −1 g cat -1 and an expected high turnover frequency (TOF) of 755 mol H2 mol Ru -1 min −1 at 298 K. The activation energy needed for the hydrolysis was low (36.65 kJ mol −1 ). This study opens up a new avenue for the rational design of high-performance catalysts for AB dehydrogenation based on the Mott-Schottky effect.
研究领域:
催化化学
·
能源材料
·
纳米材料科学
·
表面科学
·
氢能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）