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Large-scale multirole Zn(Ⅱ) programmed synthesis of ultrathin hierarchically porous carbon nanosheets

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Science China(Technological Sciences) 2020年第9期63卷 1730-1738页

作者： XU LingSong MENG FanCheng wei xiangfeng LIN ChangHao ZHENG LianXi LIU JicHua Future Energy Laboratory School of Materials Science and EngineeringHefei University of TechnologyHefei230009China Department of Mechanical Engineering School of EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of EducationKey Laboratory of Advanced Functional Materials and Devices of Anhui ProvinceHefei230009China

ZIF-derived carbon structures are considered as desired electrode materials for supercapacitors due to their high surface area,high conductivity, and porous structure. However, the most reported ratio of 2-methylimidazole and Zn(II) is 4:1 to 20:1, which limits commercial applications due to the increasing cost. In this paper, a multirole Zn(II)-assisted method is presented from Zn(II) solution, Zn O, Zn O/ZIF-8 core-shell nanostructure, to 3 D hierarchical micro-meso-macroporous carbon structures with a1:1 ratio of 2-methylimidazole and Zn(II). The hierarchically porous carbon has a high surface area of 1800 m2 g^(-1) due to the synergistic effect of multirole Zn(II). The unique carbon-based half-cell delivers the specific capacitances of 377 and 221 F g^(-1) at the current densities of 1.0 and 50 A g^(-1), respectively. As a 2.5 V symmetrical supercapacitor, the device reveals a high doublelayer capacitance of 24.4 F g^(-1), a power density of 62.5 k W kg^(-1), and more than 85.8% capacitance can be retained over 10000 cycles at 10 A g^(-1). More importantly, the low-cost hierarchically porous carbon could be easily produced on a large scale and almost all chemicals can be reused in the sustainable method.

关键词： multirole Zn(Ⅱ) hierarchically porous carbon N doping carbon nanosheets supercapacitor

Effects of nano-pore system characteristics on CH4 adsorption capacity in anthracite

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Frontiers of Earth Science 2019年第1期13卷 75-91页

作者： Chang'an SHAN Tingshan ZHANG Xing LIANG Dongchu SHU Zhao ZHANG xiangfeng wei Kun ZHANG Xuliang FENG Haihua ZHU Shengtao WANG Yue CHEN School of Earth Sciences and Engineering Xi'an Shiyou UniversityXi'an 710065China Shandong Provincial Key Laboratory of Depositional Mineralization &Sedimentary Minerals Shandong University of Science and Technology Qingdao 266590China Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) Ministry of EducationWuhan 430074China School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Exploration and Development Department Zhejiang Oilfield CompanyCNPCHangzhou 310023China SINOPEC Exploration Company Chengdu 610014China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Shaanxi Yanehang Petroleum International Exploration and Development Engineering Co.Ltd Xi'an 710075China

This study aims to determine the effects of nanoscale pores system characteristics on CH4 adsorption capacity in anthracite.A total of 24 coal samples from the southern Sichuan Basin,China,were examined systemically using coal maceral analysis,vitrinite reflectance tests, proximate analysis,ultimate analysis,low-temperature N2 adsorption-desorption experiments,nuclear magnetic resonance (NMR)analysis,and CH4 isotherm adsorption *** show that nano-pores are divided into four types on the basis of pore size ranges:super micropores (100 nm).Super micropores,micropores,and mesopores make up the bulk of coal porosity,providing extremely large adsorption space with large intemal surface *** leads us to the conclusion that the threshold of pore diameter between adsorption pores and seepage pores is 100 *** "ink bottle"pores have the largest CH4 adsorption capacity, followed by semi-opened pores,whereas opened pores have the smallest CH4 adsorption capacity which indicates that anthracite pores with more irregular shapes possess higher CH4 adsorption ***4 adsorption capacity increased with the increase in NMR porosity and the bound water ***,CH4 adsorption capacity is positively correlated with NMR permeability when NMR permeability is less than 8 ×10^-3 *** contrast,the two factors are negatively correlated when NMR permeability is greater than 8 × 10^-3 md.

关键词： CH4 adsorption capacity anthracite nanopore structure NMR physical properties

Heavy Metal Contamination in Farmland Soil and Bioremediation Measures: A Case Study of the Mining Area in Shaoguan

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Asian Agricultural Research 2016年第7期8卷 72-74页

作者： xiangfeng wei Yongxian LIU Liping PAN New Ground Environmental Co. Ltd. Institute of Agricultural Resources and Environment Guangxi Academy of Agricultural Sciences

With the rapid development of mining,the soil heavy metal contamination is increasingly serious in Shaoguan,directly affecting the production of crops. This paper analyzes the farmland soil heavy metal contamination in the mining area of Shaoguan and the causes of heavy metal contamination in recent years,brings forward the bioremediation measures to control soil heavy metal contamination,and points out the development direction of bioremediation in farmland soil heavy metal contamination in the mining area.

关键词： Farmland soil Heavy metal contamination Bioremediation

页岩不同类型孔隙的含气性差异——以四川盆地焦石坝地区五峰组—龙马溪组为例

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天然气工业 2014年第6期34卷 37-41页

作者：魏志红魏祥峰中国石化勘探南方分公司

作为中国第一个具备商业性开发价值的大型整装页岩气田,四川盆地涪陵焦石坝页岩气田的发现,极大地推动了中国页岩气产业的发展。为此,以该页岩气田上奥陶统五峰组—下志留统龙马溪组页岩为研究对象,利用氩离子抛光扫描电镜、TRA等实验... 详细信息

作为中国第一个具备商业性开发价值的大型整装页岩气田,四川盆地涪陵焦石坝页岩气田的发现,极大地推动了中国页岩气产业的发展。为此,以该页岩气田上奥陶统五峰组—下志留统龙马溪组页岩为研究对象,利用氩离子抛光扫描电镜、TRA等实验分析数据,在对该区页岩孔隙类型和特征进行研究的基础上,重点对不同类型孔隙的含气性差异进行了探讨。结果表明:页岩的孔隙包含了有机质孔、黏土矿物间孔以及脆性矿物孔(晶间孔、次生溶蚀孔等)等孔隙类型,以有机质孔和黏土矿物间孔为主,占总孔隙比例的90%左右。有机质孔隙是页岩气最重要的储集空间,高有机碳含量与高孔隙度、高有效含气饱和度呈良好的耦合关系,表明有机质孔隙含气性好;黏土矿物间孔隙由于具有亲水性,表现出黏土矿物含量与含水饱和度呈明显的正相关关系,其含气性较差。这些成果为该区域页岩气勘探提供了技术支撑,也可供类似区域借鉴。

关键词：四川盆地焦石坝地区晚奥陶世页岩气有机质孔黏土矿物间微孔含气性差异性

Exfoliated graphitic carbon nitride self-recognizing CH3NH3PbI3 crystal boundaries by hydrogen bonding interaction for improved perovskite solar cells

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Exfoliated graphitic carbon nitride self-recognizing CH3NH3P...

Technologies in Discovery and Exploration of Fuling Shale Gas Field, China

第五届新型太阳能电池学术研讨会

作者：刘寒 Xiaoqian Liu xiangfeng wei 刘节华 Future Energy Laboratory Hefei University of Technology

Recently, a convenient strategy was developed by incorporating g-CN into the perovskite layer to improve perovskite crystallization. In this work, exfoliated graphitic carbon nitride(E-g-CN), which were synthesized by HSO intercalation and NH stripping, could coil into nanoparticles spontaneous from Nanosheets by strong hydrogen bonds. Moreover, the E-g-CN could self-recognize CHNHPbI crystal boundaries by hydrogen bonding interaction to reduce the recombination of electrons and holes. As a result, a high PCE of 15.8% is achieved for E-g-CN-modified MAPbI solar cell, 24% higher than reference cells.

关键词： Exfoliated graphitic carbon nitride self-recognizing perovskite solar cells

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Natural Resources 2016年第5期7卷 271-286页

作者： Xusheng Guo Dongfeng Hu Yuping Li xiangfeng wei Qingbo Wang Hui Zhang Exploration Company SINOPEC Chengdu China

Marine shale gas in South China is widely distributed and demonstrates an enriched resource. Compared with the North American commercial shale gas field, the shale formation in South China is featured by old age, multiple stages tectonic movements, and high thermal evolution degree and complex reservoir forming conditions. As a result, the existing theories and technical methods of exploration in North America cannot be simply applied to South China. Since 2007, based on the in-depth study on a large quantity of analytical test data, we have conducted the theory and technology research for the southern marine shale gas, found Wufeng-Longmaxi Group deep water shelf high-quality shale gas critical parameters coupling laws, proposed the “Binary Enrichment” theory for highly evolved marine shale gas in southern complex tectonic zone, and established a zone selection and evaluation criteria, which are based on the quality of shale, for the key of preservation condition, and for the purpose of economy. Taking this as a guide, we selected Longmaxi formation Lower Silurian of Fuling area in southeastern Sichuan Province as the preferred breakthrough field for the shale gas exploration. The Jiaoye 1 well has the daily gas production of 20.3 × 104 m3, which embarked the found of China’s first large-scale business development gas field, the Fuling shale gas field. And we submit the first domestic shale gas proven reserves of 1067.5 × 108 m3. The Fuling shale gas reservoirs are deep water shelf marine high-quality shale, with favorable thickness and even distribution, without dissection in the middle. They are typical self-generation and self-storage shale gas reservoirs. The gas fields have high production gas well;high pressure gas reservoir, good gas components and good exploit results, and there for the Fuling shale gas field is characterized by mid-depth, high pressure, high reservoir pressure, and high quality gas accumulation.

关键词： Exploration Discovery Key Technologies Shale Gas Wufeng-Longmaxi Group Fuling Shale Gas Field

Microconcave MAPbBr3 single crystal with high photoelectric performance

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Microconcave MAPbBr3 single crystal with high photoelectric ...

Co-solvent grown CsPbBr3 perovskite single crystals as photo-detectors

第六届新型太阳能电池材料科学与技术学术研讨会

作者： Wenchao Xu Han Liu xiangfeng wei Jiehua Liu School of Materials Science and Engineering School of Electronic Science and Applied PhysicsHefei University of Technology

Against planar interface, the microscale concave exhibits excellent light trapping, but high-quality interface is required for optoelectronic devices. In this work, we report a new MAPbBr single crystal preparation method(suspension method) to obtain MAPbBr single crystal with concave surface for the first time. As an application, the high-performance microscale photodetector are fabricated on the plane and concave of MAPbBr single crystals. MAPbBr concavity possesses the good crystallinity and carrier lifetime. The superior photoelectric performance was provided by the concave based MAPbBr photodetectors rather than plane based MAPbBr devices due to the good light absorption and shortened carrier pathway. The concavity-and plane-based photodetectors are named CP and PP, respectively. As a result, CP exhibits the higher responsivity of 58.48 A W and 5.43 A W than that of PP under irradiation beam of 520 nm with low-power of 12.02 μW cm and high-power of 35.4 mW cm at 3 V bias respectively. Furthermore, the suspension micro-tube method is an efficient and universal way for exploring different concave-surface single crystals(e.g. MAPbI and MAPbCl).

关键词： Perovskite Single crystals Photodetectors Concave surface

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Co-solvent grown CsPbBr3 perovskite single crystals as photo...

500-mW cm^(-2)underwater Zn-H_(2)O_(2)batteries with ultrafine edge-enriched electrocatalysts

第五届新型太阳能电池学术研讨会

作者： Han Liu Xiaoqian Liu xiangfeng wei Jiehua Liu Future Energy Laboratory Hefei University of Technology

The growth of inorganic perovskite single crystal has attracted strong interest due to their great photoelectron characteristics and their broad applications in photoelectronic devices: light-emitting diode, solar cell and ***, Cesium lead bromide(Cs Pb Br3) single crystal has been grown by various methods and used in various devices. The researchers have reported the solution method on the growth of crystals. However, the solubility of Cs Br is limited in most of organic polar solvents. There are some additives to increase the solubility of Cs Br. Here, we show an improved anti-solvent growth crystal method by adjusting the solubility of raw materials in mixed solvent which include dimethyl sulfoxide(DMSO) and deionized water(H2 O). In this system,DMSO as solvent and H2 O as co-solvent plus acetonitrile(ACN) as anti-solvent,which inform tri-solvent system together. Furthermore, Cs Pb Br3 single crystal-based photo-detectors with high charge carrier collection efficiency are fabricated. Such photo-detectors exhibit higher current compare to others. In this study, the methods of single crystal growth and device fabrication are simple and innovative which pave the way for high-performance, single-crystal perovskite devices.

关键词： Inorganic perovskite Single crystals Co-solvent

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Science China Materials 2024年第9期67卷 2908-2914页

作者： Meng Zhou Kui Fu Yihai Xing Jianling Liu Fancheng Meng xiangfeng wei Jiehua Liu Future Energy Laboratory School of Materials Science and EngineeringHefei University of TechnologyHefei230009China Key Laboratory of Advanced Functional Materials and Devices of Anhui Province Hefei230009China Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of EducationHefei230009China

Aqueous metal-H_(2)O_(2)cells are emerging as power batteries because of their large theoretical energy densities and multiple application scenarios,especially in underwater ***,the peak power densities are less than 300 mW cm^(-2)for most reported metal-H_(2)O_(2)cells based on Mg/Al or their alloys due to the ***,we reported a Zn-H_(2)O_(2)cell with ultrafine bean-pod-like ZnCo/N-doped electrocatalysts that were synthesized via multifunctional single-cell-chain *** electrocatalyst provides abundant active sites on the crinkly interface and offers a shortened pathway for electron/ion transfer due to the desired root-like carbon nanotube(CNT)***,the optimized electrocatalyst exhibited outstanding oxygen reduction reaction(ORR)activity,with high E_(1/2)(0.90 V)and E_(onset)(1.01 V)*** importantly,Zn-H_(2)O_(2)batteries achieve a record-breaking peak-power density of 510 mW cm^(-2)and a high specific energy density of 953 Wh kg^(-1).

关键词： electrocatalyst biomass oxygen reduction reaction Zn-air cell Zn-H_(2)O_(2)battery