查找使用阿拉丁产品的科研文献

Electrostatic regulation of solvation chemistry enables ampere-hour-scale high-energy lithium metal batteries

Zhang Haikuo,Chen Long,Hua Junyi,Li Ruhong,Zhu Haotian,Ma Baochen,Zhang Shuoqing,Zhou Runjie,Ma Yuntong,Hu Shoulei,Zhang Wujun,Zhou Tao,Lv Ling,Wu Linzhe,Yu Yuan,Chen Lixin,Li Yong,Guo Rui,Guo Feng,Le Chao,Shen Yanbin,Deng Tao,Fan Xiulin

Achieving high specific energy in lithium metal batteries requires rational electrolyte design to promote effective interphase formation. State-of-the-art electrolyte design strategies fall short because they lack fundamental guidelines that connect solvent characteristics with electrolyte properties. Here we explain the influence of the medium environment on solvation states and anion reduction, and propose a mediator-enhanced electrolyte design strategy by quantitatively exploring various solvent classes using designed polarity indices. The solvent mediator approach generates, at the nanoscale, intermolecular electrostatic fields through separated solvent surface charges, enhancing interactions to better accommodate solvated lithium ions and decreasing the reduction energy barrier for anions. These tailored mediator-enhanced electrolyte solutions (MEEs) exhibit stable solvation states and adequate interphase formation, enabling robust interfacial chemistries and preventing side reactions. Using the MEE design in a 6-Ah Li ‖ LiNi 0.8 Co 0.1 Mn 0.1 O 2 pouch cell results in an initial specific energy of 508 Wh kg −1 (based on the cell’s total mass) at 21 mA g −1 (based on the cell’s cathode mass), with 93% energy retention after 149 cycles at 42 mA g −1 . In a 16-Ah zero-lithium-excess Cu ‖ LiNi 0.90 Mn 0.05 Co 0.05 O 2 pouch cell, the MEE approach also enables an initial specific energy of about 550 Wh kg −1 (based on the cell’s total mass) at 23 mA g −1 .

A multicomponent propane monooxygenase catalyzes the initial degradation of methyl tert-butyl ether in Mycobacterium vaccae JOB5

Yiyang Chen,Hao Ren,Xiangyu Kong,Hao Wu,Zhenmei Lu

An in-source helical membrane inlet single photon ionization time-of-flight mass spectrometer for automatic monitoring of trace VOCs in water

Chenxin Wu,Wei Liu,Jichun Jiang,Yan Wang,Keyong Hou,Haiyang Li

An in-source, helical membrane inlet single photon ionization time-of-flight mass spectrometry (SPI-TOFMS) has been developed to improve the detection sensitivity of trace volatile organic compounds (VOCs) in water. A helical winding membrane and a four-stage differential pumping system of TOFMS was designed to improve and maintain the vapor pressure of analyte, which is linearly associated with the sensitivity of SPI. The helical winding increased the length of the hollow fiber membrane (HFM) from 7 cm to 100 cm and the pressure inside of SPI source was elevated from 3.6 Pa to 28 Pa, and then the sensitivity was increased by 16, 34.7, 32.3, 17.9 and 13.9 times for benzene, ethyl tert-butyl ether (ETBE), aniline, p-xylene, and chlorobenzene (MCBz) respectively. The limits of quantitation (LOQs) of benzene, ETBE, aniline, p-xylene and MCBz were 0.014, 0.143, 0.556, 0.036, 0.025 μg L −1 respectively with a measurement time of 50 s, which were enhanced by more than one order of magnitude compared to our previous work (reference [32]). The in-source design of helical winding membrane i.e. putting the membrane inside the SPI source dramatically reduced the response time to 1.33 min. This system has been evaluated for VOCs in sewage water of different laboratory buildings and automatic monitoring the pollutants in sewage water from a biological laboratory building. The automatic continuous analysis of organic pollutants in water has very important significance and broad application prospect for online assessment of water quality.

Speed of sound measurement in ethyl tert-butyl ether and tert-amyl methyl ether by Brillouin light scattering

Xiong Zheng,Ying Zhang,Maogang He

Ethyl tert-butyl ether (ETBE) and tert-amyl methyl ether (TAME) have been considered as the potential fuel additives as the replacement of methyl tert-butyl ether (MTBE). Now it is necessary to supplement and perfect the thermophysical properties of oxygenates, including acoustic property. In this paper, speed of sound in ETBE and TAME were measured by Brillouin light scattering from 293.15 K to 680 K and from saturated vapor pressure to 10 MPa, including saturated liquid/vapor, compressed liquid and supercritical region. It is estimated that u ( T ) = 0.01 K under saturated condition; u ( T ) = 0.02 K, u ( p ) = 0.015 MPa for p  < 5.5 MPa, u ( p ) = 0.03 MPa for p  > 5.5 MPa under compressed liquid and supercritical conditions; and the relative expended uncertainty in the speed of sound is estimated to be less than 0.5% with coverage factor of k to be 2. Moreover, the reference relations of the speed of sound for saturated liquid, vapor and compressed state are presented for interpolation with the average absolute deviation of 0.23%, 0.07% and 0.33% for ETBE and 0.34%, 0.24% and 0.29% for TAME, respectively.

An in-source stretched membrane inlet for on-line analysis of VOCs in water with single photon ionization TOFMS

Keyong Hou,Fanglong Li,Wendong Chen,Ping Chen,Yuanyuan Xie,Wuduo Zhao,Lei Hua,Kemei Pei,Haiyang Li

An in-source, stretched, hollow fiber membrane (HFM) inlet has been developed to improve the sensitivity of on-line time-of-flight mass spectrometry (TOFMS) with a vacuum ultraviolet (VUV) lamp based single photon ionization (SPI) source for the direct analysis of liquid samples. A 2-cm HFM was stretched to 8 cm in length, and placed in the ion source and directly under the VUV lamp window with a distance of 15 mm. Compared with the conventional flow-through configuration under the same experimental conditions, the signal intensities of selected volatile organic compounds (VOCs) of methyl tert-butyl ether (MTBE), ethyl tert-butyl ether (ETBE), benzene, toluene and p-xylene were increased over 5-fold in magnitude, and the response time was shortened to one-third. The limits of detection (LOD) of MTBE, ETBE, benzene, toluene and p-xylene ranged from 0.25 to 1.3 μg L−1 with a measurement time of 60 s, and three orders of linear range were obtained with correlation coefficients of 0.9972–0.9992. The present results suggest that the in-source stretched HFM is a simple and effective way to increase the sensitivity and shorten response time of the membrane inlet, and we believe that it will also be beneficial to other types of on-line mass spectrometer for the on-line analysis of VOCs in water with a VUV lamp based SPI ion source.