检索结果-南通市图书馆

Enhancing fly ash utilization in backfill materials treated with CO_(2)carbonation under ambient conditions

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2023年第3期33卷 323-337页

作者： Ichhuy Ngo Liqiang Ma Jiangtao Zhai Yangyang Wang Key Laboratory of Deep Coal Resource Mining China University of Mining&TechnologyXuzhou 221116China

The environmental concerns resulting from coal-fired power generation that produces large amounts of CO_(2)and fly ash are of great *** mitigate,this study aims to develop a novel carbonated CO_(2)-fly ash-based backfill(CFBF)material under ambient *** performance of CFBF was investigated for different fly ash-cement ratios and compared with non-CO_(2)reacted *** fresh CFBF slurry conformed to the Herschel-Bulkley model with shear thinning *** carbonation,the yield stress of the fresh slurry increased significantly by lowering fly ash ratio due to gel *** setting times were accelerated,resulting in approximately 40.6%of increased early *** final strength decreased when incorporating a lower fly ash ratio(50%and 60%),which was related to the existing heterogeneous pores caused by rapid fluid *** strength increased with fly ash content above 70%because additional C-S(A)-H and silica gels were characterized to precipitate on the grain surface,so the binding between particles *** C-S(A)-H gel was developed through the pozzolanic reaction,where CaCO_(3)was the prerequisite calcium source obtained in the CO_(2)-fly ash ***,the maximum CO_(2)uptake efficiency was 1.39 mg-CO_(2)/*** CFBF material is feasible to co-dispose CO_(2)and fly ash in the mine goaf as negative carbon backfill materials,and simultaneously mitigates the strata movement and water lost in post-subsurface mining.

关键词： Fly ash utilization CO_(2)carbonation ambient conditions Water conservative backfill mining Negative carbon backfill materials

Porous LaFeO3 nanofiber with oxygen vacancies as an efficient electrocatalyst for N2 conversion to NH3 under ambient conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第11期29卷 402-408页

作者： Chengbo Li Dongwei Ma Shiyong Mou Yongsong Luo Benyuan Ma Siyu Lu Guanwei Cui Quan Li Qian Liu Xuping Sun College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068SichuanChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Key Laboratory for Special Functional Materials of Ministry of Education and School of Materials Science and EngineeringHenan UniversityKaifeng 475004HenanChina Green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhou 450001HenanChina College of Chemistry Chemical Engineering and Materials ScienceShandong Normal University.Jinan 250014ShandongChina

Electrocatalytic N2 reduction to NH3 under ambient conditions is an eco-friendly and sustainable alternative to the traditional Haber-Bosch process. However, inhibited by the high activation barrier of N2, this process needs efficient electrocatalysts to adsorb and activate the N2, enabling the N2 reduction reaction(NRR). Herein, we report that porous LaFeO3 nanofiber with oxygen vacancies acts as an efficient NRR electrocatalyst with abundant active sites to enhance the adsorption and activation of N2. When tested in 0.1 M HCl, such electrocatalyst achieves a high Faradaic efficiency of 8.77% and a large NH3 yield rate of 18.59 μg h–1 mgcat–***-0.55 V versus reversible hydrogen electrode. This catalyst also shows high long-term electrochemical stability and excellent selectivity for NH3 formation. Density functional theory calculations reveal that, by introducing oxygen vacancy on LaFeO3, the subsurface metallic ions are exposed with newly localized electronic states near the Fermi level, which facilitates the adsorption and activation of N2 molecules as well as the subsequent hydrogenation reactions.

关键词： N2 reduction reaction Oxygen vacancies Porous nanofiber ambient conditions Density functional theory

Rock-salt and helix structures of silver iodides under ambient conditions

在线全文

学校读者我要写书评

暂无评论

National Science Review 2019年第4期6卷 767-774页

作者： Hongyang Huang Jinying Zhang Yifan Zhang Chengcheng Fu Jialiang Huang Yonghong Cheng Chunming Niu Xinluo Zhao Hisanori Shinohara State Key Laboratory of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy (CNRE) School of Electrical EngineeringXi'an Jiaotong University Department of Physics Shanghai University Department of Chemistry and Institute for Advanced Research Nagoya University

Many different phase structures have been discovered for silver iodides. The β and γ phases were found to be the most common ones at ambient conditions, while the rock-salt phase was found to be stable under pressures between 400 MPa and 11.3 GPa. Recently, the α phase was demonstrated to be stable under ambient conditions when the particle sizes were reduced to below 10 nm. However, no other phase has been reported to be stable for silver iodides under ambient conditions. Rock-salt and helix structures have been found to be stable under ambient conditions in this study. The structures have been characterized by elemental mapping, Raman scattering, and high-resolution transmission electron microscopy. The stabilities of these structures were also confirmed by molecular dynamics and density functional theory.

关键词： carbon nanotubes silver iodides rock salt helix ambient conditions

Ultrafast metal oxide reduction at Pd/PdO_(2) interface enables onesecond hydrogen gas detection under ambient conditions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 1149-1157页

作者： Xin Geng Shuwei Li Zhi Mei Dongsheng Li Liang Zhang Long Luo Department of Chemistry Wayne State UniversityDetroitMI 48202USA Center for Combustion Energy Tsinghua UniversityBeijing 100084China School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China State Key Laboratory of Automotive Safety and Energy Beijing 100084China Physical and Computational Sciences Directorate Pacific Northwest National LaboratoryRichlandWA 99352USA

Here,we report a Pd/PdO_(x) sensing material that achieves 1-s detection of 4% H_(2) gas(i.e.,the lower explosive limit concentration for H_(2))at room temperature in *** Pd/PdO_(x) material is a network of interconnected nanoscopic domains of Pd,PdO,and PdO_(2).Upon exposure to 4% H_(2),PdO and PdO_(2) in the Pd/PdO_(x) are immediately reduced to metallic Pd,generating over a>90% drop in electrical *** mechanistic study reveals that the Pd/PdO_(2) interface in Pd/PdOx is responsible for the ultrafast PdO_(x) *** Pd at the Pd/PdO_(2) interface enables fast H_(2) dissociation to adsorbed H atoms,significantly lowering the PdO2 reduction *** addition,control experiments suggest that the interconnectivity of Pd,PdO,and PdO2 in our Pd/PdO_(x) sensing material further facilitates the reduction of PdO,which would otherwise not *** 1-s response time of Pd/PdO_(x) under ambient conditions makes it an excellent alarm for the timely detection of hydrogen gas leaks.

关键词： metal oxide reduction Pd/PdO_(2) interface 1-s H_(2)gas detection ambient conditions

Commercial indium-tin oxide glass:A catalyst electrode for efficient N_(2)reduction at ambient conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2021年第6期42卷 1024-1029页

作者： Ting Wang Shaoxiong Li Bingling He Xiaojuan Zhu Yonglan Luo Qian Liu Tingshuai Li Siyu Lu Chen Ye Abdullah M.Asiri Xuping Sun Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002SichuanChina College of Physics and Electronic Engineering Xinxiang UniversityXinxiang 453003HenanChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina College of Chemistry Sichuan UniversityChengdu 610064SichuanChina Chemistry Department Faculty of Science&Center of Excellence for Advanced Materials ResearchKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia

The typical Haber technical process for industrial NH_(3)production involves plenty of energy-consumption and large quantities of greenhouse gas *** contrast,electrochemical N_(2)reduction proffers environment-friendly and energy-efficient avenues to synthesize NH_(3)at mild conditions but demands efficient electrocatalysts for the N_(2)reduction reaction(NRR).Herein we report for the first time that commercial indium-tin oxide glass(ITO/G)can be used as a catalyst electrode toward artificial N_(2)fixation,as it demonstrates excellent selectivity at mild *** ITO/G delivers excellent NRR performance with a NH_(3)yield of 1.06×10^(-10) mol s^(-1) cm^(-2) and a faradaic efficiency of 6.17%at-0.40 V versus the reversible hydrogen electrode(RHE)in 0.5 M ***,the ITO/G also possesses good electrochemical stability and ***,the possible reaction mechanism for the NRR on the ITO catalysts was explored using first-principles calculations.

关键词： N_(2)reduction reaction NH_(3) Indium-tin oxide Electrocatalyst ambient conditions Density functional theory

A Porous Metal-organic Framework with Ultra-high Acetylene Uptake Capacity under ambient conditions

在线全文

学校读者我要写书评

暂无评论

A Porous Metal-organic Framework with Ultra-high Acetylene U...

Iron-group electrocatalysts for ambient nitrogen reduction reaction in aqueous media

中国化学会第九届全国无机化学学术会议

作者： Jiandong Pang Mingyan Wu Caiping Liu Feilong Jiang Maochun Hong State Key Laboratory of Structure Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences University of Chinese Academy of Sciences

Acetylene is a very important chemical feedstock for modern *** widely used polymer products such as polyurethane and polyester plastics are synthesized from acetylene.1 However,the safe storage and transportation of acetylene still remain challenging because of its explosiveness when compressed under pressures over 2 atm at room temperature.2-5 Here we present a porous metal-organic framework([Cu4(tddb)·(H2O)4]n·(solvent)x,abbreviated as FJI-H8),with both suitable pore space and rich open metal sites,for efficient storage of acetylene under ambient *** with existing reports,FJI-H8 shows a record-high gravimetric acetylene uptake of 224 cm3(STP)g-1 and the second-highest volumetric uptake of 196cm3(STP)cm-3 at 295 K and 1 *** the storage temperature to 308 K has only a small effect on its acetylene storage capacity(00 cm3(STP)g-1).Furthermore,FJI-H8 exhibits an excellent repeatability with only3.8%loss of its acetylene storage capacity after five cycles of adsorption-desorption *** canonical Monte Carlo simulation reveals that not only open metal sites but also the suitable pore space and geometry play key roles in its remarkable acetylene uptake.

关键词： Porous Metal-organic Framework Acetylene Uptake ambient conditions

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Nano Research 2021年第3期14卷 555-569页

作者： Benyuan Ma Haitao Zhao Tingshuai Li Qian Liu Yongsong Luo Chengbo Li Siyu Lu Abdullah M.Asiri Dongwei Ma Xuping Sun Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu610054China College of Physics and Electronic Engineering Nanyang Normal UniversityNanyang473061China Green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhou450001China Chemistry Department Faculty of Science&Center of Excellence for Advanced Materials ResearchKing Abdulaziz UniversityP.O.Box 80203Jeddah21589Saudi Arabia Key Laboratory for Special Functional Materials of Ministry of Education and School of Materials Science and EngineeringHenan UniversityKaifeng475004China

Electrochemical nitrogen reduction reaction(NRR)is considered as an alternative to the industrial Haber-Bosch process for NH3 production due to both low energy consumption and environment ***,the major problem of electrochemical NRR is the unsatisfied efficiency and selectivity of *** one group of the cheapest and most abundant transition metals,iron-group(Fe,Co,Ni and Cu)electrocatalysts show promising potential on cost and performance advantages as ideal substitute for traditional noble-metal *** this minireview,we summarize recent advances of iron-group-based materials(including their oxides,hydroxides,nitrides,sulfides and phosphides,etc.)as non-noble metal electrocatalysts towards ambient N2-to-NH3 conversion in aqueous *** to boost NRR performances and perspectives for future developments are discussed to provide guidance for the field of NRR studies.

关键词： nitrogen reduction reaction electrochemical NH_(3)synthesis iron-group catalysts ambient conditions

Oxygen-deficient SnO_(2)nanoparticles with ultrathin carbon shell for efficient electrocatalytic N_(2)reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2022年第4期7卷 672-679页

作者： Guangkai Li Haeseong Jang Zijian Li Jia Wang Xuqiang Ji Min Gyu Kim Xien Liu Jaephil Cho State Key Laboratory Base of Eco-chemical Engineering College of Chemical EngineeringCollege of Chemistry and Molecular EngineeringQingdaoUniversity of Science and TechnologyQingdao266042China Department of Energy Engineering School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan689-798South Korea College of Materials Science and Engineering Qingdao UniversityQingdao266071China Beamline Research Division Pohang Accelerator Laboratory(PAL)Pohang790-784South Korea

For high-efficiency NH_(3)synthesis via ambient-condition electrohydrogenation of inert N_(2),it is pivotal to ingeniously design an active electrocatalyst with multiple features of abundant surfacial deficiency,good conductivity and large surface ***,oxygen-deficient SnO_(2)nanoparticles encapsulated by ultrathin carbon layer(d-SnO_(2)@C)are developed by hydrothermal deposition coupled with annealing process,as promising catalysts for ambient electrocatalytic N_(2)reduction.d-SnO_(2)@C exhibits high activity and excellent selectivity for electrocatalytic conversion of N_(2)to NH_(3)in acidic electrolytes,with Faradic efficiency as high as 12.7%at-0.15 V versus the reversible hydrogen electrode(RHE)and large NH_(3)yield rate of 16.68μg h^(-1)mgcat^(-1)at-0.25 V *** in 0.1 mol L^(-1)*** from the structural superiority of enhanced charge transfer efficiency and optimized surface states,d-SnO_(2)@C also achieves excellent long-term stability.

关键词： N_(2)reduction reaction NH_(3)synthesis SnO_(2) Electrocatalysts ambient conditions

FeOOH quantum dots decorated graphene sheet:An efficient electrocatalyst for ambient N2 reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2020年第1期13卷 209-214页

作者： Xiaojuan Zhu Jinxiu Zhao Lei Ji Tongwei Wu Ting Wang Shuyan Gao Abdulmohsen Ali Alshehri Khalid Ahmed Alzahrani Yonglan Luo Yimo Xiang Baozhan Zheng Xuping Sun Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu610054China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong637002China School of Materials Science and Engineering Henan Normal UniversityXinxiang453007China Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah21589Saudi Arabia No.12 Middle School Chengdu610041China College of Chemistry Sichuan UniversityChengdu610064China

Electrochemical N2 reduction offers a promising alternative to the Haber-Bosch process for sustainable NH3 synthesis at ambient conditions,but it needs efficient catalysts for the N2 reduction reaction(NRR).Here,we report that FeOOH quantum dots decorated graphene sheet acts as a superior catalyst toward enhanced electrocatalytic N2 reduction to NH3 under ambient *** 0.1 M LiClO4,this hybrid attains a large NH3 yield rate and a high Faradaic efficiency of 27.3µg·h^−1·mg−*** 14.6%at−0.4 V *** hydrogen electrode,respectively,rivalling the current efficiency of all Fe-based NRR electrocatalysts in aqueous *** also shows strong durability during the electrolytic process.

关键词： FeOOH quantum dots decorated graphene sheet N2 reduction reaction NH3 electrosynthesis ambient conditions