检索结果-南通市图书馆

Systematic evaluation of advance in application and discharge mechanism of solution electrode glow discharge

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第1期33卷 61-70页

作者： Xiaoxu Peng Zheng Wang Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

As a kind of microplasma sustained in air,solution electrode glow discharge(SEGD)ignited between the liquid electrode and metal electrode is attractive to the fields of optical emission spectrometry and mass spectrometry due to its unique advantages,such as low power consumption and low carrier gas consumption.Moreover,the complex and efficient reactions in the liquid phase and plasma phase of SEGD make it considerable research potential in the fields of biology and medicine,material synthesis,electrochemistry.Considering the close relationship between the various fields on SEGD,here we are devoted to provide an overview of the development of SEGD in various fields.More importantly,a systematic discussion on the discharge mechanism is conducted based on the research process in various fields for getting deeper insight into the SEGD.

关键词： Solution cathode glow discharge Solution anode glow discharge Mass spectrometry Optimal emission spectroscopy discharge mechanism

A quantum-chemical study on the discharge reaction mechanism of lithium-sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第1期22卷 72-77页

作者： Lijiang Wang Tianran Zhang Siqi Yang Fangyi Cheng Jing Liang Jun Chen Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry Nankai University

Lithium-sulfur batteries have attracted a great interest in electrochemical energy conversion and storage, but their discharge mechanism remains not well understood up to now. Here, we report density functional theory （DFr） calculation study of the discharge mechanism for lithium-sulfur batteries which are based on the structure of $8 and Li2Sx （l_〈x〈_8） clusters. The results show that for LizSz （1 〈x_8） clusters, the most stable geometry is chainlike when x = 1 and 6, while the minimal-energy structure is found to be cyclic when x = 2-5, 7, 8. The stability of LizSx （l_〈x_〈 8） clusters increases with the decreasing x value, indicating a favorable thermodynamic tendency of transition from $8 to Li2S. A three-step reaction route has been proposed during the discharge process, that is, $8---~Li2S4 at about 2.30 V, Li2S4---~Li2S2 at around 2.22 V, and Li2S2 ~ Li2S at 2.18 V. Furthermore, the effect of the electrolyte on the potential platform has been also investigated. The discharge potential is found to increase with the decrease of dielectric constant of the electrolyte. The computational results could provide insights into further understanding the discharge mechanism of lithium-sulfur batteries.

关键词： lithium-sulfur battery density functional theory discharge mechanism lithium polysulfide discharge potential

Sexual spores in edible mushroom: bioactive components, discharge mechanisms and effects on fruiting bodies quality

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2023年第6期12卷 2111-2123页

作者： Yunting Li Yao Feng Yuling Shang Heran Xu Rongrong Xia Zhenshan Hou Song Pan Li Li Yuanyuan Bian Jiayi Zhu Zijian Wang Guang Xin College of Food Science Shenyang Agricultural UniversityShenyang 110866China Shenyang Agricultural University Library Shenyang 110866China

Edible mushroom sexual spores have been gaining more interest due to their bioactive components and functions.Spore discharge(SD)is an important factor affecting the quality of edible mushrooms.In this review,the bioactive nutrients of sexual spores of edible mushrooms were summarized,the SD mechanism was described,and the relationship between postharvest SD and the quality of edible mushrooms was analyzed.Spores contain various bioactive nutrients that are benefi cial to the human body.Mature mushrooms can actively discharge spores in a process affected by light,relative humidity,and temperature.During storage,the physiological metabolism of spore-bearing gill tissue is vigorous,promoting the release of postharvest spores and changing the nutritional value of fruiting bodies.The flavor of the fruiting bodies also varied signifi cantly during SD.Edible mushroom sexual spores have the potential to become new raw materials for functional food and medical resources.Research on the effect of the mechanism of SD on the quality of edible mushrooms and the development of SD regulation technology may be a new trend in the quality control of edible mushrooms,which will promote the development of the edible mushroom industry.

关键词： Edible mushroom Sexual spores Bioactive component discharge mechanism Postharvest quality

Regulating the nucleation of Li_(2)CO_(3) and C by anchoring Li-containing carbonaceous species towards high performance Li-CO_(2) batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第2期31卷 472-479页

作者： Shiyu Ma Youcai Lu Hongchang Yao Yubing Si Qingchao Liu Zhongjun Li Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina

Li-CO_(2) batteries provide an attractive and potential strategy for CO_(2) utilization as well as energy conversion and storage with high specific energy densities.However,the poor reversibility caused by the decomposition obstacles of Li_(2)CO_(3) and C products is still a challenge for Li-CO_(2) batteries,which seriously influences its electrochemical performances.Herein,a free-standing MnOOH arrays cathode has been prepared and employed in Li-CO_(2) battery,which realizes a great improvement of electrochemical performances by adjusting the discharge products distribution.Experiments coupled with theoretical calculations verifies that the formation of Li-containing carbonaceous species(LiCO_(2),LiCO and Li_(2) CO_(3))bonded with MnOOH through Li ion regulates the nucleation behavior of Li_(2)CO_(3) and C,making them grown on MnOOH uniformly.The fine Li_(2) CO_(3) grains(with a size about 5 nm)embedded into carbon matrix greatly enlarges the contact interface between them,facilitating the transmission of electrons through the discharge products and finally improves CO_(2) evolution activity.This ingenious design strategy of regulating discharge products distribution to improve electrochemical performances provides a promising way to develop advanced Li-CO_(2) batteries.

关键词： Li-CO_(2)battery MnOOH arrays Interface discharge mechanism