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Molten salt assisted fabrication of Fe@Fe_(SA)-N-C oxygen electrocatalyst for high performance Zn-air battery

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Journal of Energy Chemistry 2021年第10期30卷 612-621,I0016页

作者： Wenjun zhang Kaicai Fan Cheng-Hao Chuang Porun Liu Jian Zhao dongchen Qi Lingbo Zong Lei Wang Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life ScienceMOEState Key Laboratory of Eco-chemical EngineeringCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science and TechnologyQingdao 266042ShandongChina Centre for Clean Environment and Energy School of Environment and ScienceGriffith UniversityQueensland 4222Australia Department of Physics Tamkang UniversityTamsui 251New Taipei City 251301TaiwanChina School of Chemistry and Physics Centre for Materials ScienceQueensland University of TechnologyBrisbaneQueensland 4001Australia

Non-noble-metal-based electrocatalysts with superior oxygen reduction reaction(ORR)activity to platinum(Pt)are highly desirable but their fabrications are challenging and thus impeding their applications in metal-air batteries and fuel ***,we report a facile molten salt assisted two-step pyrolysis strategy to construct carbon nanosheets matrix with uniformly dispersed Fe_(3) N/Fe nanoparticles and abundant nitrogen-coordinated Fe single atom moieties(Fe@Fe_(SA)-N-C).Thermal exfoliation and etching effect of molten salt contribute to the formation of carbon nanosheets with high porosity,large surface area and abundant uniformly immobilized active ***-corrected high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)image,X-ray absorption fine spectroscopy,and X-ray photoelectron spectroscopy indicate the generation of Fe(mainly Fe_(3) N/Fe)and Fe_(SA)-N-C moieties,which account for the catalytic activity for *** study on modulating the crystal structure and composition of Fe_(3) N/Fe nanoparticles reveals that proper chemical environment of Fe in Fe_(3) N/Fe notably optimizes the ORR ***,the presence of abundant Fe_(SA)-N-C moieties,and potential synergies of Fe_(3) N/Fe nanoparticles and carbon shells,markedly promote the reaction *** as-developed Fe@Fe_(SA)-N-C-900 electrocatalyst displays superior ORR performance with a half-wave potential(E_(1/2))of 0.83 V versus reversible hydrogen electrode(RHE)and a diffusion limited current density of 5.6 mA cm^(-2).In addition,a rechargeable Zn-air battery device assembled by the Fe@Fe_(SA)-N-C-900 possesses remarkably stable performance with a small voltage gap without obvious voltage loss after500 h of *** facile synthesis strategy for the high-performance composites represents another viable avenue to stable and low-cost electrocatalysts for ORR catalysis.

关键词： Molten salt Oxygen reduction reaction Long-term durability Zn-air batteries

Chlorine-anion doping induced multi-factor optimization in perovskites for boosting intrinsic oxygen evolution

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Journal of Energy Chemistry 2021年第1期30卷 115-120,I0004页

作者： Yinlong Zhu Qian Lin Zhenbin Wang dongchen Qi Yichun Yin Yu Liu Xiwang zhang Zongping Shao Huanting Wang Department of Chemical Engineering Monash UniversityClaytonVIC 3800Australia Department of Physics Technical University of Denmark2800 Kongens LyngbyDenmark School of Chemistry and Physics Centre for Materials ScienceQueensland University of TechnologyBrisbaneQueensland 4001Australia Department of Chemical Engineering Curtin UniversityPerthWestern Australia 6845Australia

The oxygen evolution reaction(OER) plays a crucial role in many electrochemical energy technologies,and creating multiple beneficial factors for OER catalysis is desirable for achieving high catalytic ***,we highlight a new halogen-chlorine(Cl)-anion doping strategy to boost the OER activity of perovskite *** a proof-of-concept,proper Cl doping at the oxygen site of LaFeO3(LFO) perovskite can induce multiple favorable characteristics for catalyzing the OER,including rich oxygen vacancies,increased electrical conductivity and enhanced Fe-O *** from these factors,the LaFeO2.9-δCl0.1(LFOCl) perovskite displays significant intrinsic activity enhancement by a factor of around three relative to its parent *** work uncovers the effect of Cl-anion doping in perovskites on promoting OER performance and paves a new way to design highly efficient electrocatalysts.

关键词： Anion doping Halogen chlorine Multiple beneficial factors Oxygen evolution reaction Perovskite oxide

Two-dimensional polarized MoSSe/MoTe2 van der Waals heterostructure: A polarization-tunable optoelectronic material

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Frontiers of physics 2024年第1期19卷 251-257页

作者： Fahhad Alsubaie Munirah Muraykhan Lei zhang dongchen Qi Ting Liao Liangzhi Kou Aijun Du Cheng Tang School of Chemistry and Physics Centre for Materials ScienceQueensland University of TechnologyBrisbaneQLD 4001Australia School of Mechanical Medical and Process EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia

Two-dimensional (2D) heterostructures have shown great potential in advanced photovoltaics due to their restrained carrier recombination, prolonged exciton lifetime and improved light absorption. Herein, a 2D polarized heterostructure is constructed between Janus MoSSe and MoTe_(2) monolayers and is systematically investigated via first-principles calculations. Electronically, the valence band and conduction band of the MoSSe−MoTe_(2) (MoSeS−MoTe_(2)) are contributed by MoTe_(2) and MoSSe layers, respectively, and its bandgap is 0.71 (0.03) eV. A built-in electric field pointing from MoTe_(2) to MoSSe layers appears at the interface of heterostructures due to the interlayer carrier redistribution. Notably, the band alignment and built-in electric field make it a direct z-scheme heterostructure, benefiting the separation of photogenerated electron-hole pairs. Besides, the electronic structure and interlayer carrier reconstruction can be readily controlled by reversing the electric polarization of the MoSSe layer. Furthermore, the light absorption of the MoSSe/MoTe_(2) heterostructure is also improved in comparison with the separated monolayers. Consequently, in this work, a new z-scheme polarized heterostructure with polarization-controllable optoelectronic properties is designed for highly efficient optoelectronics.

关键词： MoSSe MoTe2 photovoltaics ferroelectric heterostructure

Development of the geodetic coordinate system in Antarctica

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Advances in Polar Science 2012年第3期23卷 181-186页

作者： zhang Shengkai E dongchen Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China Key Laboratory of Polar Surveying and Mapping SBSMWuhan 430079China

Defining a universal geodetic coordinate system is one of the fundamental challenges of geodesy. We present a review of the basic general coordinate systems -- the space rectangular coordinate system, the geodetic coordinate system, the topocentric coordinate system, and the plane coordinate system. We then look ： t the World Geodetic System WGS72 and WGS84 and the In- ternational Terrestrial Reference Frames ITRF2000 and 1TRF2005, which were introduced when space technology became avail- able. The history of international geodetic coordinate systems in the Antarctic region is briefly reviewed and the development of the geodetic coordinate systems in the Chinese Great Wall Station and Zhongshan Station in Antarctica is outlined. Finally, the issue of coordinate system transformation is discussed.

关键词： Antarctic coordinate system ITRF GPS

Progress and prospects in Chinese Antarctic surveying, mapping and remote sensing studies

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Advances in Polar Science 2012年第1期23卷 1-8页

作者： E dongchen zhang Shengkai Chinese Antarctic Center of Surveying and Mapping Wuhan University Wuhan 430079 China Key Laboratory of Polar Surveying and Mapping SBSM Wuhan 430079 China

Antarctic surveying, mapping and remote sensing is one of the important aspects of the Chinese Antarctic geoscience research program that stretch back over 25 years, since the first Chinese National Antarctic Research Expedition （CHINARE） in 1984. During the 1980＇s, the geodetic datum, height system and absolute gravity datum were established at the Great Wall and Zhongshan Stations. Significant contributions have been made by the construction of the Chinese Great Wall, Zhongshan and Kunlun Stations in Antarctica. Geodetic control and gravity networks were established in the King George Islands, Grove Moun- tains and Dome Argus. An area of more than 200 000 km2 has been mapped using satellite image data, aerial photogrammetry and in situ data. Permanent GPS stations and tide gauges have been established at both the Great Wall and Zhongshan Stations. Studies involving plate motion, precise satellite orbit determination, the gravity field, sea level change, and various GPS applications for atmospheric studies have been carried out. Based on remote sensing techniques, studies have been undertaken on ice sheet and glacier movements, the distributions of blue ice and ice crevasses, and ice mass balance. Polar digital and visual mapping tech- niques have been introduced, and a polar survey space database has been built. The Chinese polar scientific expedition manage- ment information system and Chinese PANDA plan display platform were developed, which provides technical support for Chi- nese polar management. Finally, this paper examines prospects for future Chinese Antarctic surveying, mapping and remote sens- ing.

关键词： Antarctic geodesy remote sensing geographic information system digital mapping

Tidal characteristics near the Chinese Zhongshan Station in Prydz Bay, East Antarctica

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Geodesy and Geodynamics 2013年第1期4卷 7-15页

作者： Huang Jifeng E dongchen zhang Shengkai Chinese Antarctic Center of Surveying and Mapping Wuhan University Wuhan University's Key Antarctic Science Laboratory of SBSM

A permanent tidal station was installed at the Chinese Zhongshan Station in Feb. 2010. Harmonic constants of 170 tidal constituents were obtained from harmonic analysis of the first year＇ s data. The results of the eight main constituents showed good agreement with those of two tidal models. Tidal characteristics, such as tide type, diurnal inequality, tidal range, and water levels were also analyzed.

关键词： tidal characteristics harmonic constants tidal models sea level Antarctica

Progress in Chinese Antarctic geodetic remote sensing

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Advances in Polar Science 2018年第2期29卷 78-86页

作者： E dongchen WANG Zemin zhang Shengkai Chinese Antarctic Center of Surveying and Mapping Wuhan University

This paper summarizes the progress of the Chinese Antarctic expedition in geodetic remote sensing. It describes the systems for continuous satellite navigation and positioning, and the tide gauges that have been established at the Zhongshan and Great Wall stations in Antarctica. Advances in the investigation of plate motion, the gravity field, and sea level change as well as the application of GPS in atmospheric studies are reported. Details of the movements of ice sheets and glaciers, distributions of blue ice and ice crevasses, and mass balance studies based on remote sensing techniques are presented. The use of field, satellite, and photogrammetric data to produce topographic maps is described. Finally, the prospects for further Antarctic surveying and mapping are discussed. In the near future, we will establish a high-precision geodetic datum in the Chinese Antarctic expedition areas, monitor changes of Antarctic snow and ice, and develop a platform for sharing Antarctic resource and environment information.

关键词： Antarctica geodesy remote sensing GIS

Screening of Primers for DNA Barcoding of Sedum Plants

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Agricultural Biotechnology 2015年第5期4卷 17-18,21页

作者： Yang zhang Haiye HAO dongchen NA College of Life Science Shanxi Normal University

[ Objective] This study aimed to screen primers for DNA barcoding of Sedum plants. [ Method] Sedum lineare Thunb., S. spectabile Boreau, S. ta- tarinowii Maxim, S. aizoon L. and S. sarmentosum Bunge were used as experimental materials. Nuclear DNA and chloroplast DNA were extracted from these five Sedum plants with CTAB method for primer screening by PCR amplification. PCR products were detected by agarose gel electrophoresis. [ Result] Four sequences suitable for DNA barcoding of Sedum plants were preliminarily screened from six candidate sequences （psbA-trnH, ropB, rbcL, rpoC1, ITS 2, marK）, including psbA-trnH, ropB, rpoC1 and ITS 2. The amplification rate of these four sequences reached 100%. [ Conclusion] This study provided basis for DNA barcoding of Sedum plants.

关键词： Sedum plants Primer screening DNA barcoding

用PPP技术确定南极Amery冰架的三维运动速度

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武汉大学学报（信息科学版） 2005年第10期30卷 909-912页

作者：张小红鄂栋臣武汉大学测绘学院武汉市珞喻路129号430079 武汉大学中国南极测绘研究中心武汉市珞喻路129号430079

基于GPS精密点定位(precise point positioning,PPP)技术,利用IGS的精密星历数据编制软件处理了在Amery冰架获取的连续5d的GPS卫星跟踪观测资料,初步获得了冰架前端观测点处的冰流速度和冰流方向。根据定位解算出的高程系列的周期变化,... 详细信息

基于GPS精密点定位(precise point positioning,PPP)技术,利用IGS的精密星历数据编制软件处理了在Amery冰架获取的连续5d的GPS卫星跟踪观测资料,初步获得了冰架前端观测点处的冰流速度和冰流方向。根据定位解算出的高程系列的周期变化,初步推求出观测点处的海潮周日变化参数。研究成果可为后续的物质平衡计算提供依据。

关键词： GPS 精密点定位 Amery冰架运动